Engine Controls - Tests W/codes - 4.9L: Diagnosis Ford Pickup F350

DIAGNOSTIC FORMATS

QUICK TEST and CIRCUIT TESTS are diagnostic formats used to test and service EEC-V system. QUICK TEST allows technician to identify problems and retrieve diagnostic trouble codes. CIRCUIT TESTS check circuits, sensors and actuators.

Before starting any CIRCUIT TEST, follow all steps under QUICK TEST to find correct CIRCUIT TEST. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-V system is okay.

DIAGNOSTIC TROUBLE CODES (DTC)

During QUICK TEST , 3 types of diagnostic trouble codes are retrieved: KOEO, KOER and Continuous Memory Codes. See QUICK TEST for self-test procedures. Codes may be cleared from PCM memory after they have been recorded or repaired. See CLEARING CODES .

KOEO & KOER SELF-TEST Codes

Record codes in order received. These codes indicate current faults in system and should be serviced in order of appearance. Use DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART to identify correct CIRCUIT TEST to perform.

Note. If self-test will not activate or TOOL COMMUNICATION ERROR is received, go to CIRCUIT TEST QA, step 1).

Diagnostic Aids

After each service or repair procedure has been completed, repeat QUICK TEST to ensure all EEC-V systems work properly and diagnostic trouble codes are no longer present.

KOEO SELF-TEST

Ensure engine is warmed to normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST. Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu. (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CTRL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select KOEO ON-DEMAND SELF-TEST.
7. Turn ignition on.
8. Follow operating instructions from scan tester menu.

KOER SELF-TEST

Ensure engine is warmed to normal operating temperature. Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu. (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CTRL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select KOER ON-DEMAND SELF-TEST.
7. Start engine and allow to idle.
8. Follow operating instructions from scan tester menu.
9. Perform BOO and TCS cycling (if equipped).

SERIES THROTTLE ASSEMBLY INSPECTION

Turn ignition off. Remove air tube from series throttle assembly. Check throttle plate for binding. Repair/replace as necessary. If fault cannot be isolated, see CIRCUIT TEST HT, step 20).

CONTINUOUS MEMORY SELF-TEST (EMISSION RELATED)

Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu (optional). (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester (optional).
3. Select GENERIC OBD-II OPTIONS. Press CONT button if monitors are not complete.
4. Select DIAGNOSTIC TROUBLE CODES.
5. Turn ignition on.
6. Follow operating instructions from scan tester menu.

CONTINUOUS MEMORY SELF-TEST (EXPANDED MODE)

Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu. (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CTRL MODULE.
5. Select DIAGNOSTIC TEST MODES.
6. Select RETRIEVE/CLEAR CONTINUOUS DTCs.
7. Turn ignition on.
8. Follow operating instructions from scan tester menu.

Scheme 2

ON-BOARD SYSTEM READINESS (OSR) TEST MODE

All OBD-II scan testers must display OSR test. The OSR will display monitors on the vehicle and status of all monitors; complete or not complete. If not complete, the scan tester will display which monitor has not completed.

To enter OSR, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu (optional). (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester.
3. Follow operating instructions from scan tester menu.
4. Select GENERIC OBD-II FUNCTIONS. Press TEST button if monitors are not complete.
5. Start engine and allow to idle.
6. Select ON-BOARD SYSTEM READINESS.

OXYGEN SENSOR TEST MODE

This mode allows access to on-board sensor fault limits and actual values during test cycle. The test cycle has specific engine operating conditions that must be met for completion. This information is used to determine the efficiency of the catalytic converter.

To access OXYGEN SENSOR TEST mode, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu (optional). (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester (optional).
3. Follow operating instructions from scan tester menu.
4. Select GENERIC OBD-II FUNCTIONS.
5. Select OXYGEN SENSOR TESTS.
6. Select appropriate oxygen sensor test and follow menu instructions.

OUTPUT TEST MODE

This mode allows a technician to energize and de-energize most of the system output actuators on command. After accessing OUTPUT TEST MODE, outputs and cooling fans can be turned on and off separately.

To access OUTPUT TEST MODE, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps

1. Select vehicle and engine selection menu. (Scheme 2)
2. Select year, engine, model and any additional information requested by scan tester.
3. Follow operating instructions from scan tester menu.
4. Select DIAGNOSTIC DATA LINK.
5. Select PCM - POWERTRAIN CTRL MODULE.
6. Select DIAGNOSTIC TEST MODE.
7. Select ACTIVE COMMAND MODE.
8. Select OUTPUT TEST MODE.
9. Turn ignition on.
10. Follow operating instructions from scan tester menu.
11. Select either LOW SPEED FAN, HIGH SPEED FAN or ALL ON mode.
12. Select START to turn outputs on. This step may cause link up to PIDs.
13. Select STOP to turn outputs off.

Catalyst Efficiency Monitor Federal Test Procedure

The federal test procedure catalyst efficiency monitor is an on-board strategy designed to monitor and determine when a catalytic converter has fallen below the minimum level of effectiveness in its ability to control exhaust emission. It relies mainly on the front and rear Heated Oxygen Sensors (HO2S) to infer catalyst efficiency based upon oxygen storage capacity. The front and rear HO2S switches are counted under specified conditions for the purpose of calculating rear to front HO2S switch ratio. After the switch ratio is calculated, it is compared against an emission threshold value. If the switch ratio is greater than the emission threshold, the catalyst has failed. The oxygen storage capacity of a high efficiency catalyst will have a low switch ratio and high HC efficiencies. As catalyst efficiency deteriorates, its ability to store oxygen declines and it will begin to have a higher switch ratio and low HC efficiencies. In general, as catalyst efficiency decreases, the switch ratio increases. Inputs from the ECT, IAT and TP sensors are required to enable the Federal Test Procedure Catalyst monitor.

1. In the federal test procedure catalyst efficiency monitor test, only switches during steady state cruise conditions of a drive cycle are counted. Switches at idle or other drive modes are not counted. The counting of front and rear HO2S switches continues until a drive cycle is completed. see scheme 5 At that time, the ratio of total rear switches to total front HO2S switches is calculated. If the switch ratio is greater than the emission threshold, the catalyst has failed and a Diagnostic Trouble Code (DTC) is stored. The DTCs associated with this test are DTCs P0420 and P0430.
2. Catalyst Efficiency DTC is stored in memory, and Malfunction Indicator Light (MIL) is illuminated after catalyst efficiency monitor detects a malfunction up to 6 consecutive drive cycles.

OBD-II MONITOR DISPLAY ON SCAN TOOL

On-board system readiness function is available on New Generation Star (NGS) tester or generic scan tools. Readiness function indicates status of each OBD-II monitor. One Parameter Identification (PID) display on NGS tester, summerizers the status of all monitors.

OBD-II DRIVE CYCLE & DIAGNOSTIC TROUBLE CODES

Note. A trip does not have to be completed to set DTC in memory.

A Diagnostic Trouble Code (DTC) will be stored in PCM memory after a malfunction is first detected. A DTC will be erased from the PCM's memory after 40 engine warm-up cycles without the malfunction being detected after the MIL is turned off. Another method of erasing the DTC is initiating a PCM reset. DTC memory storage requirements vary with each monitor. See appropriate monitor under ON BOARD DIAGNOSTIC II MONITORS .

OBD-II DRIVE CYCLE TEST PROCEDURE

The primary function of OBD-II Drive Cycle is to clear DTC P1000. OBD-II Drive Cycle assists in identifying an OBD-II system problem through total monitor testing. (Scheme 3) Rerunning certain parts of drive cycle will verify repair of some monitor systems.

1. For HO2S monitor repair verifications, perform steps 1) through 4) and steps 10) and 11).
2. For EGR monitor repair verification, perform Steps 1) through Step 5) and steps 10) and 11).
3. For Evaporative Emission monitor repair verification, perform Step 1) and Steps 7) through 11).
4. For Misfire Detection monitor repair verification, perform the Misfire Detection Repair Verification Drive Cycle when directed here from the Misfire Pinpoint Tests. See «MISFIRE DETECTION REPAIR VERIFICATION DRIVE CYCLE»(ref-23594-S40129330532002030800000) .
5. For all other monitor repair verification, perform entire OBD-II Drive Cycle if directed here from the EEC-V Pinpoint Tests.

If driver is working alone, scan tool can be used after drive cycle is completed to view monitor system status. A scan tool can be installed in vehicle before drive cycle to observe DTC output. Scan tool an be used anytime through the couse of a drive cycle to observe monitor completion status by viewing On-Board Readiness Menu and PID Monitor Data Record Function.

Note. Rough road surfaces may prevent some monitors from completeing and extreme ambient temperatures may pervent the HO2S, Catalyst (both steady state and Federal Test Procedure) and Evaporative Emission monitors from initiating.

Note. If a particular drive mode of Drive Cycle is interrupted before completion, repeat drive mode. Once started, engine must not be turned off at any time during OBD-II Drive Cycle.

Note. Vehicles with PTO must have system disengaged before OBD-II Drive Cycle is started.

Note. The engine on all vehicle applications, (except, Escort/Tracer) must be warmed up to an operating temperature of at least 180,°F (82°C) before .proceeding with the OBD-II Drive Cycle (check ECT PID). The OBD-II drive cycle for the Escort/Tracer must be initiated on a cold start or at an ECT reading of less than 100°F (45°C) to assure completion of the evaporative thermister flow test (part of the comprehensive component monitor) and the catalyst monitor. This temperature can be verified with the ECT PID on the Scan Tool. Do not turn the engine off or restart anytime during the OBD-II Drive Cycle to clear DTC P1000. If a key off does occur, start the process from the beginning.

1. Start engine. Drive vehicle or idle in neutral for 4 minutes.
2. Idle vehicle in drive (neutral for M/T) for 40 seconds.
3. Accelerate vehicle to 45 MPH (M/T upshift from 1st to 5th gear, but hold in 2nd gear for at least 5 seconds) at 1/4 to 1/2 throttle for 10 seconds.
4. Drive vehicle with steady throttle at 45 MPH (M/T use 5th gear) for 30 seconds.
5. Idle vehicle in Drive (neutral for M/T) for 40 seconds.
6. Continue driving vehicle in city traffic at speeds between 25 and 40 MPH (M/T primarily drive vehicle in 3rd and 4th gear when possible) for 15 minutes. During 15 minute drive, the following modes must be achieved: At least 5 stop and idle modes at 10 seconds each. Accelerations from idle at 1/4 to 1/2 throttle. Choose 3 different speeds to do 1.5 minute steady state throttle drives.
7. Accelerate vehicle up between 45 and 60 MPH (M/T upshift to 5th gear). This should take approximately 8 minutes.
8. Drive vehicle and hold throttle steady at the selected speed between 45 and 60 MPH (M/T use 5th gear) for approximately 5 minutes.
9. Drive vehicle for 5 minutes at varying speeds between 45 and 60 MPH (M/T use 5th gear).
10. Bring the vehicle back to idle. Idle in drive (neutral for M/T) for 40 seconds.
11. Rerun quick test. See «QUICK TEST»(ref-23594-S34023665322001010300000) .

Scheme 3

DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART

DTC REFERENCE CHART

Scheme 4

CIRCUIT TEST A - NO START VEHICLE WILL NOT START

Enter this CIRCUIT TEST only when all steps under QUICK TEST . have been successfully completed and engine still does not start or if directed here from another test or chart. This test is only intended to diagnose

1. Ignition Control Module (ICM).
2. Powertrain Control Module (PCM).
3. Spark (PCM-controlled).
4. Wiring harness circuits (PIP, IGN GND and VPWR).

To prevent replacement of good components, be aware the following non-EEC related areas and components may be cause of problem

1. Fuel quality and quantity.
2. Ignition (general condition).
3. Engine mechanical components.
4. Starter and battery circuits.
5. Crankshaft Position (CKP) sensor.
6. Ignition Control Module (ICM).
7. Coil packs.

Ignition System Test Circuits. Scheme 5

1. Step 1) Starting System Check Ensure fuel pump inertia switch is closed (button pushed in). Try to start engine. If engine does not crank, check vehicle starting and charging systems. If engine cranks, go to next step.
2. Step 2) Attempt to start engine. If engine now starts, go to CIRCUIT TEST Z, step 50). If engine does not start, go to next step.
3. Step 3) Check For Malfunction Indicator Light (MIL) During Cranking Turn ignition off. Turn ignition on and observe MIL. If MIL is off, go to CIRCUIT TEST NB, step 1). If MIL is on, turn ignition switch to the START position. If MIL goes off, PIP circuit is okay; go to next step. If MIL stays on while engine is cranking, go to step 6).
4. Step 4) Check VREF At TP Sensor Turn ignition off. Disconnect TP sensor. Measure voltage between terminal VREF and SIG RTN at TP sensor wiring harness connector. (Scheme 7) If voltage is 4-6 volts, go to step 7). If resistance not 4-6 volts, go to CIRCUIT TEST C.
5. Step 5) Check Flash EPROM (FEPS) Circuit For Short To Power With ignition on, measure voltage between negative battery terminal and DLC terminal No. 13. see scheme 1 If voltage is less than 9 volts, go to next step. If voltage is 9 volts or more, repair circuit for a short to power and repeat quick test.
6. Step 6) Check For Spark At Plugs Disconnect any spark plug wire. Connect spark tester between spark plug wire and ground. Connect Spark Plug Firing Indicator (D89P-6666-A). Crank engine while checking for spark. If spark is okay go to next step. If spark is not okay, go to CIRCUIT TEST JD, step 1).
7. Step 7) Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. With scan tester connected, turn ignition on. Using scan tester, access OUTPUT TEST MODE and operate fuel pump to obtain max. fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to CIRCUIT TEST HC, step 1).
8. Step 8) Check Fuel Pressure Leakdown Leave fuel pressure gauge installed and ignition on. Turn ignition on. Using scan tester, access OUTPUT TEST MODE and operate fuel pump to obtain maximum fuel pressure. Exit OUTPUT TEST MODE and turn ignition off. If fuel pressure remains within 5 psi of maximum pressure for one minute after turning ignition off, go to next step. If fuel pressure does not remain as specified, go to CIRCUIT TEST HC, step 1).
9. Step 9) Check Continuity Of Ignition Ground Circuit Ensure ignition is turned off. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Install EI Diagnostic Harness (007-00059) to breakout box. Connect ICM tee in-line with wiring harness. Install ICM overlay. Measure resistance between test pin No. 23 at breakout box and IGN GND terminal at the EI Diagnostic Harness. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
10. Step 10) Check Continuity Of PIP Circuit Ensure ignition is off and PCM is disconnected. Disconnect ICM from wiring harness. Measure resistance between test pin No. 49 at breakout and PIP circuit at EI Diagnostic Harness. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
11. Step 11) Check PIP Circuit For Short To Power Turn ignition on. Leave PCM and ICM disconnected. Measure voltage between test pin No. 49 and negative battery terminal. If voltage is less than one volt, go to next step. If voltage one volt or more, repair short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 12) Check PIP Circuit For Short To Ground Turn ignition off. Measure resistance between breakout box test pin No. 49 and test pins No. 23, 51, 91 and 103. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vehicle will not start, go to next step.
13. Step 13) Check PIP Signal Ensure ignition is off. Reconnect ICM. While cranking engine, measure voltage between test pins No. 23 and 49 at breakout box. If voltage is 3-7 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 3-7 volts, replace ICM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 17). No test procedures have been omitted.
14. Step 17) Check PCM Driver To Coils Turn ignition off. Connect 12-volt test light between B+ and coil driver circuit. Crank engine while observing test light. Repeat procedure for each coil driver. Test light should blink brightly, once for each engine revolution. If test light blinks as specified, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If test light does not blink as specified, go to CIRCUIT TEST JD, step 4). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 17) to step 20). No test procedures have been omitted.
15. Step 20) Identify Type Of No-Start Attempt to start engine. If it now starts, see CIRCUIT TEST Z step 50). If engine does not start, go to next step. NOTE: Ensure fuel pump inertia switch is closed (button pushed in).
16. Step 21) Starting System Check Try to start engine. If engine cranks, go to next step. If engine does not crank, check vehicle starting and charging systems.
17. Step 22) Check VREF At TP Sensor Turn ignition off. Disconnect TP sensor. Measure resistance between terminal VREF and SIG RTN at TP sensor wiring harness connector. If resistance is 4-6 volts, go to next step. If resistance is not 4-6 volts, go to CIRCUIT TEST C.
18. Step 23) Check For Spark At Plugs Disconnect any spark plug wire. Connect spark tester between spark plug wire and ground. Crank engine while checking for spark. If spark is okay, go to step 33). If spark is not okay, go to next step.
19. Step 24) Check For Spark At Coil Disconnect coil secondary wire from distributor. Connect spark tester between wire and ground. Crank engine while checking for spark. If spark is okay, go to CIRCUIT TEST JB, step 1). If spark is not okay, go to next step.
20. Step 25) Check Continuity Of IGN GND Circuit Ensure ignition is turned off. Disconnect Camshaft Position (CMP) sensor. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Install EI Diagnostic Harness (007-00059) to breakout box. Connect B- to negative battery terminal. Connect ICM tee and CMP tee in-line with wiring harness. Ensure PIP OPEN/NORMAL/SPOUT OPEN switch or diagnostic is in NORMAL position. Install DI overlay. Measure resistance between test pin No. 23 and 35 (IGN GND) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
21. Step 26) Reconnect CMP sensor. Connect PCM to breakout box. Turn breakout box timing switch to DIST position. Try to start engine. If engine starts, go to step 31). If engine does not start, go to next step.
22. Step 27) Check SPOUT Signal Ensure ignition is off. While cranking engine, measure AC voltage between test pin No. 50 (SPOUT) and negative battery terminal. If voltage is 3-6 volts, go to CIRCUIT TEST JD. If voltage is not 3-6 volts, place timing switch in COMPUTED position and go to next step.
23. Step 28) Check PIP & SPOUT Circuit For Short To Power Turn ignition off. Disconnect CMP, ICM and PCM. Turn ignition on. Measure voltage between test pin No. 49 (PIP) and negative battery terminal. Measure voltage between test pin No. 50 (SPOUT) and negative battery terminal. If voltage is less than 10.5 volts, go to next step. If voltage 10.5 volts or more, repair short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
24. Step 29) Check PIP & SPOUT Circuit For Short To Ground Turn ignition off. Measure resistance between breakout box test pin No. 49 (PIP) and test pins No. 23, 51, 91 and 103. Measure resistance between breakout box test pin No. 50 (SPOUT) and test pins No. 23, 51, 91 and 103. If resistance each is greater than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vehicle will not start, go to next step.
25. Step 30) Isolate Shorts In PCM Ensure ignition is off. Connect PCM to breakout box. Measure resistance between breakout box test pin No. 49 (PIP) and test pins No. 71 and 97 for short to power. Measure resistance between breakout box test pin No. 49 (PIP) and test pins No. 51 and 103 for short to ground. Measure resistance between breakout box test pin No. 50 (SPOUT) and test pins No. 71 and 97 for short to power. Measure resistance between breakout box test pin No. 49 (PIP) and test pins No. 51 and 103 for short to ground. If resistance each is greater than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
26. Step 31) Check PIP Signal Ensure ignition is off and PCM is connected to breakout box. While cranking engine, measure voltage between test pin No. 49 and test pins No. 51 and 103. If voltage is 3-7 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 3-7 volts, go to next step.
27. Step 32) Check Continuity Of PIP Circuit Ensure ignition is off. Disconnect PCM from breakout box. Disconnect CMP and ICM. Measure resistance between breakout box test pin No. 49 and EI Diagnostic Harness test pins No. 15 and 34. If resistance is less than 5 ohms, reconnect all components and go to CIRCUIT TEST JB. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
28. Step 33) Check SPOUT Signal Ensure ignition is off. Connect PCM to breakout box. Ensure breakout box timing switch is in COMPUTED position. While cranking engine, measure voltage between test pin No. 50 and test pins No. 51 and 103. If voltage is 3-6 volts, go to next step. If voltage is not 3-6 volts, go to step 28).
29. Step 34) Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. With scan tester connected, turn ignition on. Using scan tester, access OUTPUT TEST MODE and operate fuel pump to obtain maximum fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, see CIRCUIT TEST HC, step 1).
30. Step 35) Check Fuel Pressure Leakdown Leave fuel pressure gauge installed and ignition on. Turn ignition on. Using scan tester, access OUTPUT TEST MODE and operate fuel pump to obtain maximum fuel pressure. Exit OUTPUT TEST MODE and turn ignition off. If fuel pressure remains within 5 psi of maximum pressure for one minute after turning ignition off, fuel system is okay and testing is complete. If fuel pressure does not remain as specified, go to CIRCUIT TEST HC, step 1).

CIRCUIT TEST B - EEC-V POWER RELAY

This circuit test is only intended to diagnose the following components and circuits

1. Vehicle wiring harness circuits (VPWR, IGNITION START/RUN, B+ and Ground).
2. EEC-V power relay.
3. Powertrain Control Module (PCM).

EEC-V Power Relay Test Circuits. Scheme 6

1. Step 1) Check VPWR Circuit Continuity Turn ignition off. Disconnect Idle Air Control (IAC) solenoid and EEC-V power relay wiring harness connectors. Disconnect scan tool (if applicable). Measure resistance between VPWR terminal of IAC solenoid connector and VPWR terminal of EEC-V power relay. If resistance is less than 5 ohms, reconnect IAC solenoid and go to next step. If resistance is 5 ohms more, repair open in VPWR circuit between EEC-V power relay and IAC solenoid.
2. Step 2) Check Voltage To EEC-V Power Relay Leave ignition off and EEC-V power relay disconnected. Connect DVOM negative lead to negative battery terminal. Measure voltage at B+ terminal of EEC-V power relay connector. Turn ignition on. Measure voltage at IGN START/RUN. If voltage is less than 10.5 volts, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is more than 10.5 volts, replace EEC-V power relay and repeat QUICK TEST.
3. Step 3) Check Ground Circuit To EEC-V Power Relay Leave ignition off and EEC-V power relay disconnected. Measure voltage between Ground terminal and B+ terminal of EEC-V power relay. If resistance is more than 10.5 volts, replace EEC-V power relay. If resistance is 10.5 volts or less, repair open in Ground circuit.

SIG RTN is a dedicated ground used by most EEC-V system sensors. VREF is a 5-volt reference voltage that is continuously output by PCM. This consistent voltage signal is used on all 3-wire sensors.

This circuit test is only intended to diagnose the following components and circuits

1. A/C Pressure sensor, DPFE sensor and TP sensor.
2. Vehicle wiring harness circuits (SIG RTN and VREF).
3. Powertrain Control Module (PCM).

Reference Voltage Circuits & Connector Terminals. Scheme 7

If VREF voltage is more than 6 volts, go to step 35). If voltage is less than 6 volts, go to step 1).

Scheme 8

1. Step 1) Check Battery Voltage Turn ignition on. Measure voltage between battery terminals. If battery voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, recharge or replace battery as necessary.
2. Step 2) Check SIG RTN Circuit Disconnect suspect sensor wiring harness connector. Measure voltage between SIG RTN terminal of suspect sensor and positive battery terminal. If voltage measurement is more than 10.5 volts and within one volt of battery voltage, go to next step. If voltage is less than 10.5 volts, go to step 25).
3. Step 3) Check Scan Tool Ability To Access Parameter ID (PID) PID is area of PCM Random Access Memory (RAM) that holds operating information for input and output data. If scan tool is able to access ECT PID, go to step 20). If scan tool is unable to access ECT PID, go to next step.
4. Step 4) Check VPWR To Idle Air Control (IAC) Solenoid Turn ignition off. Disconnect TP sensor wiring harness connector. Disconnect IAC solenoid. Turn ignition on. Measure voltage between VPWR terminal (Red wire) at IAC wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, reconnect the wiring harness connector and go to CIRCUIT TEST B. (Scheme 8): Identifying IAC Wiring Harness Connector Terminals
5. Step 5) Check For Shorted DPFE Or EGR Valve Position (EVP) Sensor Disconnect TP wiring harness connector. Disconnect DPFE sensor. Turn ignition on. Measure voltage between TP sensor wiring harness connector SIG RTN terminal and VREF terminal. If voltage measurement is 4-6 volts, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage measurement is not 4-6 volts, go to step 15). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 15). No test procedures have been omitted.
6. Step 15) Check VPWR To PCM Turn ignition off. Leave all previously disconnected sensors disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 (VPWR) and 77 (PWR GND). If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit between IAC splice and PCM.
7. Step 16) Check VREF Circuit For Short To Ground Or SIG RTN Turn ignition off. Leave all previously disconnected sensors disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 90 (VREF) and test pins No. 51 and 103 (PWR GND), and 91 (SIG RTN). If any resistance is less than 10,000 ohms, repair VREF short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or more, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 20). No test procedures have been omitted.
8. Step 20) Check VREF Continuity To PCM Turn ignition off. Ensure sensor with failed VREF circuit is disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Measure resistance between test pin No. 90 (VREF) and VREF terminal at suspect sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance 5 ohms or more, repair open in VREF, repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 25). No test procedures have been omitted.
9. Step 25) Check Scan Tool Ability To Access Parameter ID (PID) If scan tool is able to access ECT PID, go to next step. If scan tool is unable to access ECT PID, go to step 28).
10. Step 26) Check KOEO DTCs If KOEO DTCs are present for 2 or more sensors connected to SIG RTN circuit, go to next step. If KOEO DTCs are not as specified, repair open in SIG RTN to sensor where VREF circuit failed.
11. Step 27) Check SIG RTN Circuit Continuity PCM Turn ignition off. Disconnect scan tester from DLC. Disconnect sensor where VREF circuit failed. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal of suspect sensor wiring harness connector. If resistance is less than 5 ohms, reconnect sensor and go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 28) Check PCM PWR GND Circuits Turn ignition off. Leave scan tester disconnected. Measure resistance between negative battery terminal and test pins No. 51, 77 and 103 (PWR GND). If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open circuit, repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
13. Step 29) Check Ground Circuits In PCM Leave ignition off and scan tester disconnected. Connect PCM to breakout box. Measure resistance between test pin No. 91 (SIG RTN) and test pins No. 51, 77 and 103 (PWR GND). If each resistance is less than 5 ohms, PWR GND and SIG RTN are okay. Return to step 25) to verify results. If any resistance is 5 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 29) to step 35). No test procedures have been omitted.
14. Step 35) Check VREF Circuit For Short To Power Turn ignition off. Ensure sensor with failed VREF circuit is disconnected. Leave all VREF circuit sensors disconnected. Disconnect PCM. Turn ignition on. Measure voltage between VREF terminal at TP sensor wiring harness connector and negative battery terminal. If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is 0.5 volt or more, repair VREF circuit for a short to power and repeat QUICK TEST.

Perform this test only when directed by QUICK TEST . Ambient air temperature must be at least 50°F (10°C) to receive valid input from IAT sensor. Engine coolant temperature must be more than 50°F (10°C) to pass KOEO SELF-TEST and more than 180°F (82°C) to pass KOER SELF-TEST . Voltage values in this test are based on a 5-volt VREF signal. Values may vary up to 15 percent due to sensor and VREF variations.

This circuit test is intended to diagnose the following components and circuits

1. Intake Air Temperature (IAT) sensor.
2. Engine Coolant Temperature (ECT) sensor.
3. Wiring harness circuits (IAT, ECT and SIG RTN).
4. Powertrain Control Module (PCM).

To prevent replacing good components, ensure the following non-EEC areas or components are not cause of problem

1. Coolant level low.
2. Cooling system, water pump or fan.
3. Engine operating temperature.
4. Engine oil level low.
5. Thermostat.
6. Air cleaner duct.
7. Ambient temperature.

Temp Sensor Circuits & Connector Terminals. Scheme 9

1. Step 1) DTC P1116 This trouble code indicates sensor is out of self-test range. Correct range for measurement is.3-3.7 volts. Check for following possible causes: Low coolant level. Faulty harness connector. Faulty sensor. Start engine and run until engine is at normal operating temperature. If vehicle cannot be started, go to step 3). Ensure upper radiator hose is hot and pressurized. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If DTC P1116 is present, go to next step. If DTC P1116 is not present, fault is intermittent and cannot be duplicated at this time. testing is complete.
2. Step 2) Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect Throttle Position (TP) sensor. Turn ignition on. Measure voltage at TP sensor wiring harness connector between VREF and SIG RTN terminal. (Scheme 7) If voltage is 4-6 volts, reconnect TP sensor and go to step 3). If voltage is not 4-6 volts, go to CIRCUIT TEST C.
3. Step 3) Check Temperature Sensor Resistance (KOEO) Turn ignition off. Disconnect suspect sensor. Measure resistance between signal circuit (ECT or IAT) terminal and SIG RTN terminal at sensor wiring harness connector. See «ACT & ECT SENSOR»(ref-23594-S18016341072001010300000) SPECIFICATIONS table. If resistance is not within specification, replace suspected sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is within specification, perform following step as applicable: For diagnosing vehicles with ECT sensor related fault and a no-start condition, DO NOT service DTC P1116 at this time. Repair no-start condition and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). For diagnosing vehicles without a no-start condition, go to next step.
4. Step 4) Check Temperature Sensor Resistance (KOER) Warm engine to normal operating temperature. Turn ignition off. Disconnect suspect sensor. Start engine and operate at 2000 RPM for 2 minutes. Measure resistance between signal circuit (ECT or IAT) terminal and SIG RTN terminal at sensor wiring harness connector. See «ACT & ECT SENSOR SPECIFICATIONS»(ref-23594-S18016341072001010300000) table. If resistance is within specification, replace PCM, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If sensor is not within specification replace sensor, and repeat QUICK TEST. ACT & ECT SENSOR SPECIFICATIONS Temperature °F (°C) (1) Volts (1) Ohms 50 (10) 3.51 58,750 68 (20) 3.07 27,300 86 (30) 2.60 24,270 104 (40) 2.13 16,150 122 (50) 1.70 10,970 140 (60) 1.33 7700 158 (70) 1.02 5370 176 (80) 0.78 3840 194 (90) 0.60 2800 212 (100) 0.46 2070 (1) Values may vary by 15 percent. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 10). No test procedures have been omitted.
5. Step 10) DTC P0118 Or P0113: Induce Opposite DTC (117 Or 112) DTC P0118 (ECT) or P0113 (IAT) indicate corresponding sensor signal is more than self-test maximum. Maximum signal voltage for ECT and IAT sensor is 4.6 volts. Possible causes for excess voltage signals are: Open circuit in wiring harness (IAT or ECT). Faulty connection. Faulty sensor. Faulty PCM. Turn ignition off. Disconnect suspect temperature sensor. Connect a jumper wire between signal circuit (ECT or IAT) terminal and SIG RTN terminal at sensor wiring harness connector. With scan tester installed, turn ignition on. NOTE: If communication link error is displayed, remove jumper wire and go to step 12). Access ECT or IAT PID. If the PID is less than 0.2 volt, replace sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If PID is 0.2 volt or more, remove jumper wire and go to next step.
6. Step 11) Check Continuity Of Sensor Signal & SIG RTN Circuits Turn ignition off. Ensure suspect temperature sensor is disconnected. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 38 (ECT sensor) or test pin No. 39 (IAT sensor) at breakout box and SIG RTN terminal at sensor wiring harness connector. Also, measure resistance between test pin No. 91 (SIG RTN) and SIG RTN circuit at sensor wiring harness connector. If both readings are less than 5 ohms, replace PCM, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If either reading is 5 ohms or more, repair open circuit and repeat QUICK TEST.
7. Step 12) Check For Sensor Signal Short To VREF Turn ignition off. Ensure suspect temperature sensor is disconnected. Measure resistance between test pin No. 90 (VREF) and test pin No. 38 (ECT sensor) or test pin No. 39 (IAT sensor) at breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If either resistance is less than 10,000 ohms, repair short circuit to VREF and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
8. Step 20) DTC P0117 or P0112 DTC P0117 (ECT) or P0112 (IAT) indicates sensor signal is less than self-test minimum. Minimum signal for IAT and ECT sensor is 0.2 volt. Possible causes for this fault are: Circuit grounded in wiring harness. Faulty sensor. Faulty connection. Faulty PCM. Turn ignition off. Disconnect wiring harness connector from suspect sensor. Check for damaged wiring, and repair as necessary. With scan tester connected, turn ignition on. Using scan tester, access ECT of IAT PID. If PID is less than 4.2 volts, go to next step. If PID is 4.2 volts or more, replace sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
9. Step 21) Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between VREF and SIG RTN at TP sensor wiring harness connector. If voltage is 4-6 volts, connect TP sensor and go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
10. Step 22) Check Signal Circuit For Short To Ground Turn ignition off. Disconnect suspect sensor. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 38 (ECT) or 39 (IAT) and test pins No. 24, 51 and 91. If any reading is less than 10,000 ohms, repair short circuit, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If all readings are 10,000 ohms or more, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.
11. Step 90) Continuous Memory DTC P0112, P1112, P0113, P0117, P1117 Or P0118: Check Sensor These trouble codes indicate possible intermittent fault. Possible causes for these faults are: Faulty sensor. Faulty sensor connector. Open or grounded circuit in harness. Faulty PCM. With scan tester connected, turn ignition on. Access ECT or IAT PID. While observing PID, tap on sensor to simulate road shock. Wiggle sensor connector. If no change in temperature reading occurs, go to next step. If any change in temperature occurs, isolate fault and repair as necessary.
12. Step 91) Check EEC-V Wiring Harness While in PID, wiggle and bend small sections of wiring harness working toward PCM. If fault is indicated, isolate fault and repair as necessary. Clear memory, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If no fault is found, go to step 92).
13. Step 92) Inspect PCM & Wiring Harness Connectors Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. If connectors and terminals are damaged, repair as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If connectors and terminals are okay, fault cannot be duplicated at this time and testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.
14. Step 100) DTC P0125 These DTCs indicate ECT sensor has not reached normal operating temperature. Possible causes for this fault are: Insufficient engine warm-up time. Thermostat leaking or stuck open. Low coolant. Repair cooling system as necessary. Clear PCM memory, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).

Perform this test only when directed by QUICK TEST . EFT sensor will operate within the range of -40-248°F (-40-120°C). This circuit test is intended to diagnose the following components and circuits

1. EFT sensor.
2. Wiring harness circuits (EFT and SIG RTN).
3. Powertrain Control Module (PCM).

EFT Connector Terminals. Scheme 10

Injector Pressure (IP) Sensor Connector Terminals. Scheme 11

Fuel Rail Components. Scheme 12

EFT SENSOR SPECIFICATIONS

1. Step 1) DTC P0183 (EFT A) Or P0188 (EFT B) This trouble code indicates sensor signal is greater than self-test maximum. Self-test maximum is 4.6 volts. Check for following possible causes: Open circuit in wiring harness. Faulty harness connector. Faulty sensor. Faulty PCM. Turn ignition off. Disconnect suspect temperature sensor. Connect a jumper wire between signal circuit (EFT A or EFT B) terminal and SIG RTN terminal at sensor wiring harness connector. With scan tester installed, turn ignition on. NOTE: If communication link error is displayed, remove jumper wire and go to step 12). Access EFT A or EFT B PID. If the PID is less than 0.2 volt, replace sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If PID is 0.2 volt or more, remove jumper wire and go to next step.
2. Step 2) Check Continuity Of Sensor Signal & SIG RTN Circuits Turn ignition off. Ensure suspect temperature sensor is disconnected. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 62 (EFT A) or test pin No. 10 (EFT B) at breakout box and SIG RTN terminal at sensor wiring harness connector. Also, measure resistance between test pin No. 91 (SIG RTN) and SIG RTN circuit at sensor wiring harness connector. If both readings are less than 5 ohms, replace PCM, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If either reading is 5 ohms or more, repair open circuit and repeat QUICK TEST.
3. Step 3) Check For Sensor Signal Short To VREF Turn ignition off. Ensure suspect temperature sensor is disconnected. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 90 (VREF) and test pin No. 62 (EFT A) or test pin No. 10 (EFT B) at breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If either resistance is less than 10,000 ohms, repair short circuit to VREF and repeat QUICK TEST.
4. Step 4) DTC P0182 (EFT A) Or P0187 (EFT B) This trouble code indicates sensor signal is less than self-test minimum. Self-test minimum is 0.2 volts. Check for following possible causes: Wiring harness circuit short to ground. Faulty harness connector. Faulty sensor. Faulty PCM. Turn ignition off. Disconnect suspect temperature sensor. With scan tester connected to DLC, turn ignition on. Access EFT A PID or EFT B PID. If the PID is less than 4.2 volt, replace sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If the PID is 4.2 volt or more, go to next step.
5. Step 5) Check VREF Circuit Voltage At Injection Pressure (IP) Sensor Turn ignition off. Disconnect IP sensor wiring harness connector. Turn ignition on. Measure voltage between VREF and SIG RTN at IP sensor wiring harness connector. If voltage is 4-6 volts, connect IP sensor and go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
6. Step 6) Check Signal Circuit For Short To Ground Turn ignition off. Disconnect suspect sensor. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 62 (EFT A) or 10 (EFT B) and test pins No. 24, 51 and 91. If any reading is less than 10,000 ohms, repair short circuit, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If all readings are 10,000 ohms or more, replace PCM and repeat QUICK TEST.
7. Step 7) Continuous Memory DTC P0182, P0183, P0187 Or P0188 These trouble codes indicate possible intermittent fault. Possible causes for these faults are: Faulty sensor. Faulty sensor connector. Open or grounded circuit in harness. Faulty PCM. With scan tester connected, turn ignition on. Access EFT A or EFT B PID. While observing PID, tap on sensor to simulate road shock. Wiggle sensor connector. If no change in temperature reading occurs, go to next step. If any change in temperature occurs, isolate fault and repair as necessary.
8. Step 8) Check EEC-V Wiring Harness While in PID, wiggle and bend small sections of wiring harness working toward PCM. If fault is indicated, isolate fault and repair as necessary. Clear memory, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no fault is found, go to next step.
9. Step 9) Inspect PCM & Wiring Harness Connectors Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. If connectors and terminals are damaged, repair as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If connectors and terminals are okay, fault cannot be duplicated at this time and testing is complete.

Perform this test when directed by QUICK TEST . This CIRCUIT TEST is intended to diagnose the following

1. MAF sensor.
2. Wiring harness circuits (VPWR, PWR GND, MAF SIG and MAF RTN).
3. Powertrain Control Module (PCM).

To prevent replacement of good components, be aware the following non-EEC related areas may be cause of problem

1. Air cleaner element.
2. Inlet air duct.
3. Throttle body.

Mass Airflow (MAF) Sensor Circuits & Connector Terminals. Scheme 13

1. Step 1) KOER DTC P1101: Check MAF Sensor Continuous Memory Codes DTC P1101, retrieved during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) , indicates MAF signal was not 0.34-1.96 volts during self-test. Drive vehicle for 10 minutes and repeat KOEO and Continuous Memory self-test. If any Continuous Memory DTC is present with KOER P1101, proceed as follows: Continuous Memory DTC P0102, go to step 6). Continuous Memory DTC P0103, go to step 20). All other Continuous Memory DTCs, service as necessary. If no Continuous Memory DTCs are present with KOER P1101, go to next step. NOTE: DTC P1101 may be caused by low battery or by use of a garage exhaust ventilation system. Ensure vehicle is vented to outside atmosphere before repeating «QUICK TEST»(ref-23594-S34023665322001010300000) .
2. Step 2) KOEO/KOER DTC P1101: MAF Output Voltage DTC P1101, retrieved during KOEO or KOER self-test, indicates voltage exceeded .2-volt test range. Possible causes for this fault are: Air leak before or after MAF sensor. Faulty or contaminated MAF sensor. Faulty MAF sensor wiring harness connector. Open PWR GND or MAF RTN circuit. Faulty PCM. Turn ignition off. Ensure MAF sensor is connected. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950). Leave PCM connected to breakout box. With scan tester connected, turn ignition on. Measure voltage between test pin No. 88 (MAF SIG) and test pins No. 24 and 103 (PWR GND). If voltage is greater than 0.2 volt, go to step 12). If voltage is 0.2 volt or less, go to step 8).
3. Step 3) Continuous Memory DTC P1100: Check MAF Circuit Intermittent Voltage Input DTC P1100, retrieved from continuous memory indicates voltage went out of range (0.39-3.90 volts) sometime during previous 40 warm-up cycles. Possible causes for this fault are: Faulty MAF sensor. Faulty MAF sensor wiring harness circuit or connector. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. With scan tester connected, raise engine speed to 1500 RPM for 5 seconds, and return to idle. Access MAF PID. While observing PID, tap on sensor to simulate road shock. Wiggle sensor connector. If MAF PID voltage stays within 0.39-3.90 volt range, go to next step. If volt range is not as specified, check MAF sensor and connector. Repair or replace as necessary.
4. Step 4) Check MAF Sensor Circuit Integrity Turn ignition off. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Connect voltmeter between test pin No. 36 (MAF RTN) and No. 88 (MAF SIG). While observing voltmeter, wiggle and bend wiring harness between sensor and dash panel. Wiggle and bend wiring harness between dash panel and PCM. If voltage reading goes out of normal range (0.39-3.90 volts), isolate fault and repair as necessary. Reset KAM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage does not go out of normal range, fault cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.
5. Step 6) Continuous Memory & KOER DTC P0102: Check MAF Low Input Signal To PCM DTC P0102 indicates MAF signal was less than 0.39 volt sometime during normal engine operation. Possible causes for this fault are: Open or closed MAF circuit. Open circuit (MAF, MAF RTN, PWR GND, or VPWR). MAF circuit shorted to ground. Air leak before or after MAF sensor. Faulty MAF sensor or connector. Faulty TP system. Faulty PCM. Ensure air induction system is okay. Repair if necessary. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. With scan tester connected, raise engine speed to 1500 RPM and return to idle. Access MAF PID. If MAF PID is less than 0.39 volt, go to next step. If MAF PID is 0.6-1.0 volts, go to step 15). For all other MAF PID readings, go to step 2).
6. Step 7) Check VPWR Circuit Voltage Turn ignition off. Disconnect MAF sensor. Turn ignition on. Measure voltage between VPWR terminal of MAF sensor wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit.
7. Step 8) Check Continuity Of VPWR Circuit Turn ignition off. Leave MAF sensor disconnected. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between VPWR terminal of MAF sensor wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in VPWR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 9) Check MAF Circuit For Short To Ground & MAF RTN Circuit Leave ignition off and MAF disconnected. Ensure PCM is disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 88 (MAF SIG) and test pins No. 36 (MAF RTN), 51 and 103 (PWR GND) at breakout box. If resistance is 10,000 ohms or more, reconnect scan tester and go to next step. If resistance is less than 10,000 ohms, repair circuit short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
9. Step 10) Check MAF RTN Circuit For Short To PWR GND Circuit Leave ignition off, PCM and MAF disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 36 (MAF SIG) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is 10,000 ohms or more, reconnect scan tester and go to next step. If resistance is less than 10,000 ohms, repair circuit short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
10. Step 11) Check Continuity Of MAF SIG Circuit Leave ignition off, PCM and MAF disconnected. Measure resistance between MAF terminal of MAF sensor wiring harness connector and test pin No. 88 (MAF SIG) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit in MAF SIG circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
11. Step 12) Check PWR GND Circuit To MAF Sensor Leave ignition off and MAF disconnected. Connect PCM to breakout box. Turn ignition on. Measure voltage between VPWR and PWR GND terminal of MAF sensor wiring harness connector. If voltage is less than 10.5 volts, go to next step. If voltage is 10.5 volts or more, go to step 14).
12. Step 13) Check PWR GND Circuit Continuity Leave ignition off and MAF sensor disconnected. Disconnect PCM from breakout box. Disconnect scan tester from DLC (if applicable). Measure resistance between PWR GND terminal of MAF sensor wiring harness connector and negative battery terminal. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair open in PWR GND circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
13. Step 14) Check MAF RTN Circuit Continuity Leave ignition off, PCM and MAF sensor disconnected. Measure resistance between MAF RTN terminal of MAF sensor wiring harness connector and test pin No. 36 (MAF RTN) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in MAF RTN and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
14. Step 15) Check MAF Circuit For Short To Ground In PCM Leave ignition off and MAF disconnected. Connect PCM to breakout box. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 88 (MAF SIG) and test pins No. 36 (MAF RTN) 51 and 103 (PWR GND) at breakout box. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
15. Step 16) Leave ignition off, PCM and MAF disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 36 (MAF RTN) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is 10,000 ohms or more, go to next step. If resistance less than 10,000 ohms, replace PCM, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
16. Step 17) Check MAF Circuit Output Ensure ignition is off. Reconnect MAF sensor. Connect PCM to breakout box. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. Measure voltage between test pin No. 88 (MAF SIG) and negative battery cable. If voltage is 0.34-1.96 volts, go to next step. If voltage is not 0.34-1.96 volts, replace MAF sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
17. Step 18) Ensure ignition is off, MAF sensor and PCM are connected. With engine idling, measure voltage between test pin No. 36 (MAF RTN) and 88 (MAF SIG). If voltage is 0.34-1.96 volts, go to next step. If voltage not 0.34-1.96 volts, replace MAF sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
18. Step 19) Check MAF Circuit Output With Scan Tester Start engine and allow to idle. Access MAF PID on scan tester. If PID voltage is 0.34-1.96 volts, fault is intermittent and cannot be identified at this time. Go to CIRCUIT TEST Z. If voltage is not 0.34-1.96 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
19. Step 20) DTC P0103: Check MAF High Input Signal To PCM DTC P0103 indicates MAF signal was more than 4.70 volts sometime during normal engine operation. Possible causes for this fault are as follows: Restricted MAF sensor screen. MAF SIG circuit shorted to VPWR. Faulty MAF sensor or connector. Faulty PCM. Ensure air induction system is okay. Repair if necessary. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. With scan tester connected, raise engine speed to 1500 RPM and return to idle. Access MAF PID. PID reading should be more than 4.60 volts. Turn ignition off. Disconnect MAF sensor. Start engine and allow to idle. Access MAF PID. If PID voltage reading does not drop to less than 0.39 volt, go to next step. If PID voltage reading does drop to less than 0.39 volt, replace MAF sensor.
20. Step 21) Check MAF SIG Circuit For Short To Power Leave ignition off and MAF sensor disconnected. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 88 (MAF SIG) and test pins No. 24 and 103 at breakout box. If voltage is less than 10.5 volts, go to next step. If voltage is 10.5 volts or more, repair MAF SIG circuit short to power.
21. Step 22) Check MAF SIG Circuit For Short To Power In PCM Leave ignition off and MAF sensor disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 88 (MAF SIG) and test pins No. 71 and 97 (VPWR) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or less, repair short between MAF SIG and VREF circuit. Repeat QUICK TEST.

Perform this test only when directed by QUICK TEST . This test is intended to diagnose the following

1. Wiring harness circuits (VSC SIG and VSC GND).
2. Powertrain Control Module (PCM).

ABS Module VSC Connector Terminals. Scheme 14

1. Step 1) DTC P0500: Check Vehicle Speed PID DTC P0500 indicates that PCM has detected error in vehicle speed information received from ABS module. Possible causes for this fault are: Open or short in harness. Faulty ABS module. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to Diagnostic Link Connector (DLC). Turn ignition on. Using scan tester, access VSS PID. Road test vehicle as follows: Gradually accelerate vehicle to 50 MPH while observing VVV PID MPH. If VSS PID matches speedometer, fault is intermittent; go to step 4). If VSS PID does not match speedometer, go to next step.
2. Step 2) Check Circuit Continuity Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (014-00950), leaving PCM disconnected. Disconnect ABS wiring harness connector. Measure resistance between VSC GND terminal of ABS module wiring harness connector and test pin No. 33 at breakout box. Measure resistance between VSC SIG terminal of ABS module wiring harness connector and test pin No. 58 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
3. Step 3) Check Circuit For Short To Ground Leave PCM and ABS module disconnected. Disconnect scan tester from DLC (if applicable). Turn ignition off. Measure resistance between test pin No. 58 and test pins No. 33 (VSC GND), 51 and 103 (PWR GND) No. 71 (VPWR) and No. 91 (SIG RTN). Measure resistance between test pin No. 33 and test pin No. 71. If any reading is less than 10,000 ohms, repair short circuit, and go to step 5). If all readings are 10,000 ohms or more, check for fault in ABS system. If no faults are present, replace PCM.
4. Step 4) Visual Inspection Turn ignition off. Visually inspect VSC wiring harness for any of the following conditions: Loose or corroded ABS module connector. Loose or corroded PCM connector. Incorrect routing of VSC wiring harness. If any faults are present, repair as necessary and go to next step. If all readings are 10,000 ohms or more, check for fault in ABS system.
5. Step 5) Test Drive Vehicle Ensure engine is warmed to normal operating temperature. Perform the following drive cycle 3 times

Perform this test only when directed by QUICK TEST . This test is intended to diagnose the following

1. Knock Sensor (KS).
2. Wiring harness circuits (KS and SIG RTN).
3. Powertrain Control Module (PCM).

To prevent replacement of good components, be aware the following non-EEC related areas may be at fault

1. Poor fuel quality.
2. Ignition system.
3. Ignition or valve timing.
4. Engine mechanical condition.

Single KS Sensor Test Circuits & Connector Terminals. Scheme 15

Dual KS Sensor Test Circuits & Connector Terminals. Scheme 16

1. Step 1) Check Sensor Voltage DTC P0325, P0326, P0330 and P0331 indicate that ignition timing was not adjusted after spark knock has occurred. Possible causes for this fault are: High altitude interference. Open or short in harness. Faulty knock sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged and repair as necessary. Install EEC-V Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Measure voltage between suspect sensor test pin and test pin No. 91 (SIG RTN). If voltage is 2.4-2.6 volts, go to next step. If voltage is less than 2.4 volts, go to step 5). If voltage is more than 2.6 volts, go to step 6).
2. Step 2) Check For Intermittent Circuit Fault Leave ignition on. Measure voltage between suspect sensor test pin and test pin No. 91. While observing voltmeter, wiggle small sections of wiring harness starting at the knock sensor and going to the PCM. Lightly tap on knock sensor and PCM. If voltmeter reading stays within normal operating range (2.4-2.6 volts), go to next step. If voltmeter reading goes out of range, isolate fault and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
3. Step 3) Check For Voltage Increase Turn ignition off. Leave PCM connected to breakout box. Disconnect scan tester from DLC. Set voltmeter on AC scale. Start engine and allow to idle. Measure voltage between suspect sensor test pin and test pin No. 91. Raise engine speed to 3000 RPM. If AC voltage increases, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If AC voltage does not increase, go to next step.
4. Step 4) Check Circuit Continuity Turn ignition off. Disconnect PCM from breakout box. Disconnect suspect sensor. Measure resistance of KS circuit (KS1 or KS2) between suspect sensor connector terminal and breakout box. Measure resistance of SIG RTN circuit between suspect sensor connector terminal and breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check Circuit For Short To Ground Leave suspect sensor disconnected. Measure resistance between KS circuit (KS1 and KS2) test pins and test pin No. 91. Measure resistance between KS circuit test pins and the following power ground test pins No. 24, 51, 76, 77 and 103. Measure resistance between KS circuits and ground. If all resistance measurements are 10,000 ohms or more, replace knock sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.
6. Step 6) Check Circuit For Short To Power Leave ignition on. Measure voltage between KS circuit (KS1 and KS2) test pins and the following power ground test pins No. 24, 51, 76, 77 and 103. If each voltage measurement is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If any voltage measurement is 0.5 volt or more, repair circuit short to power and repeat QUICK TEST.

Perform this test only when directed by QUICK TEST . This test is intended to diagnose the following

1. TP sensor.
2. Wiring harness circuits (PWR GND, SIG RTN, TP, VPWR and VREF).
3. Powertrain Control Module (PCM).

Normal range of throttle angle measurement for TP sensor is 0-85 degrees. To pass QUICK TEST procedure, range of throttle rotation (in degrees) must be within 3 percent of specification.

To prevent replacement of good components, be aware the following non-EEC related areas may be at fault

1. Idle speed.
2. Binding throttle shaft or linkage.
3. TP sensor not seated.

TP Sensor Schematic. Scheme 17

TP Sensor Circuit & Connector Terminals. Scheme 18

1. Step 1) KOEO/KOER DTC P1124: Check For Other Codes DTC P1124 indicates TP sensor rotational setting may be out of self-test range. Possible causes for this fault are: Faulty TP sensor. Faulty Powertrain Control Module (PCM). Perform KOEO and KOER self-test. Check for DTC P1400. If DTC P1400 is present, service code and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If DTC P1400 is not present with DTC P1124, go to next step.
2. Step 2) Check For Binding Throttle Plate Inspect throttle body for binding. If throttle body is binding, check throttle or cruise control linkage, vacuum line or harness interference. Repair as necessary, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no mechanical problem is found, go to step 8).
3. Step 3) DTC P1120: Check For Binding Throttle Plate DTC P1120 indicates TP sensor closed throttle position is below range of 3.4 percent (.17 volt) Possible causes for this fault are: Damaged wiring harness or connectors. Open in VREF circuit. Faulty TP sensor. Faulty Powertrain Control Module (PCM). Inspect TP sensor connector for damage or corrosion. Inspect wiring harness between TP sensor and PCM for damage or corrosion. Repair as necessary, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no mechanical problem is found, go to next step.
4. Step 4) Check For Stuck TP Sensor Turn ignition off. Connect scan tester to DLC. Access TP PID on scan tester. While observing TP PID, slowly move throttle through range from closed to wide open throttle. If TP PID indicates any sudden drops to below 0.49 volt, go to next step. If TP PID increase and decrease is gradual and smooth, go to step 20).
5. Step 5) Check VREF Circuit Voltage With TP sensor disconnected, turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.
6. Step 6) Check TP Circuit Continuity Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and TP terminal of TP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TP circuit.
7. Step 7) Check TP Sensor Signal To PCM Turn ignition off. Connect PCM to breakout box. Start engine and idle for 2 minutes. While slowly opening throttle, measure voltage between test pin No. 89 (TP) and 91 (SIG RTN) at breakout box. If at any time voltage enters 0.17-0.40 volt range, replace TP sensor. If voltage does not enter 0.17-0.40 volt range, go to next step.
8. Step 8) DTC P0123 This code indicates TP signal is more than self-test maximum. Possible causes for this fault are: TP sensor not seated correctly. Faulty TP sensor. TP circuit shorted to VREF or VPWR. VREF circuit shorted to VPWR. Open in SIG RTN circuit. Faulty PCM. Turn ignition off. Disconnect TP sensor wiring harness connector. Inspect for damage and repair as necessary. Turn ignition on. Access TP PID on scan tester. If PID voltage is 0.17 volt or more, go to step 10). If PID voltage is less than 0.17 volt, go to next step.
9. Step 9) Check VREF Circuit Voltage With TP sensor disconnected, turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If reading is 4-6 volts, go to next step. If reading is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.
10. Step 10) Check TP Circuit For Short To Power Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and test pins No. 71, 90 and 97 (VPWR) at breakout box. If any resistance is less than 10,000 ohms, repair TP circuit short to VREF and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If each resistance is 10,000 ohms or more, replace PCM and repeat QUICK TEST.
11. Step 11) DTC P0122 This code indicates TP signal is less than self-test minimum of 0.17 volt. Possible causes for this fault are: TP sensor not seated correctly. Faulty TP sensor. Open TP or VREF circuit. TP circuit shorted to SIG RTN or PWR GND. Faulty PCM. Turn ignition off. Disconnect TP sensor wiring harness connector. Inspect for damage and repair as necessary. Connect jumper wire between VREF and TP terminals at TP wiring harness connector. Turn ignition on. Access TP PID on scan tester. If PID voltage is more than 4.60 volts, replace TP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If PID voltage is 4.60 volts or less, remove jumper wire and go to next step. If scan tester is unable to access TP PID, go to step 14).
12. Step 12) Check VREF Circuit Voltage With TP sensor disconnected, turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.
13. Step 13) Check TP Circuit Continuity Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and TP terminal of TP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TP circuit.
14. Step 14) Check TP Circuit For Short To SIG RTN Or PWR GND Leave ignition off and TP sensor disconnected. Measure resistance between test pin No. 89 (TP) and test pins No. 91 (SIG RTN), 24 and 103 (PWR GND) at breakout box. If any resistance is less than 10,000 ohms, repair TP circuit short to SIG RTN or PWR GND and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If both resistances are 10,000 ohms or more, replace PCM and repeat QUICK TEST.
15. Step 15) Continuous Memory Code P1121 This code indicates TP signal is inconsistent with MAF sensor signal. Possible causes for this fault are as follows: TP sensor not seated correctly. Faulty TP sensor. Air leak between MAF sensor and throttle body. If engine will start, go to next step. If engine is a no-start, check for cracks or openings in air induction system between MAF sensor and throttle body. If air induction system is okay, go to CIRCUIT TEST A.
16. Step 16) Check Operation Of TP Sensor Start engine and allow to idle. Access TP PID on scan tester. While observing TP PID, slowly move throttle through range from closed position to wide open throttle. If TP PID indicates any sudden drops to below 0.66 volt, or increases to more than 1.20 volts, replace TP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If TP PID increase and decrease is gradual and smooth, and within 0.66-1.20 volt range, go to next step.
17. Step 17) Check Operation Of TP Sensor While Driving Vehicle Connect scan tester to DLC. Drive vehicle while accessing TP PID and LOAD PID. If TP PID is 2.44 volts or less and LOAD PID is more than 25 percent, go to next step. If TP PID is more than 2.44 volts and LOAD PID is less than 25 percent, check for cracks or openings in air induction system between MAF sensor and throttle body. If air induction system is okay, replace TP sensor.
18. Step 18) Check TP Sensor Low With Engine Under Load Start engine and allow to idle. If engine does not start, go to CIRCUIT TEST A. Access TP PID and LOAD PID on scan tester. If TP PID is 0.24 volt or more and LOAD PID is less than 60 percent, fault is intermittent and cannot be located at this time. Testing is complete. If TP PID is less than 0.24 volts and LOAD PID is 60 percent or more, clear PCM memory. Perform test drive utilizing all phases of vehicle operation. Perform «QUICK TEST»(ref-23594-S34023665322001010300000) . If DTC P1121 is still present, replace MAF sensor. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 20). No test procedures have been omitted.
19. Step 20) Continuous Memory Code P1121 Or P1125 Theses codes indicate TP signal went below 0.49 volt or above 4.60 volts sometime during the last 80 drive cycles. Possible causes for this fault are: Faulty TP sensor wiring harness or connector. Faulty TP sensor. With scan tester connected, start engine and allow to idle. Raise engine speed to 1500 RPM for 5 seconds and return to idle. Using scan tester, access TP PID. While observing PID, lightly tap on TP sensor to simulate road shock. Wiggle sensor connector and wiring harness. If TP PID reading stays within normal operating range (0.49-4.60 volts), go to next step. If TP PID reading goes out of range, replace TP sensor.
20. Step 21) Check Wiring Harness Between TP Sensor & PCM Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950). Connect PCM to breakout box. Connect DVOM between test pin No. 89 (TP) and 91 (SIG RTN). While observing DVOM, wiggle small sections of wiring harness starting at the TP sensor and going to the PCM. If DVOM reading stays within normal operating range (0.49-4.60 volts), problem is intermittent and cannot be identified at this time. Go to CIRCUIT TEST Z. If DVOM reading goes out of range, isolate fault and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
21. Step 22) DTC P0121: Verify KOER Self-Test Completion Start engine and allow to idle. Using scan tester, enter KOER self test. If DTC P0121 is present or KOER cannot be terminated, go to next step. If specified symptoms are not present, problem is intermittent and cannot be identified at this time.
22. Step 23) With engine idling, place gear selector in Drive or Reverse. If KOER self-test terminates, go to next step. If KOER self-test does not terminate, turn ignition off and wait for 15 seconds. Start engine and allow to idle. Enter KOER self-test. If DTC P0121 is present or KOER self-test cannot be terminated, go to next step. If specified symptoms are not present, problem is intermittent and cannot be identified at this time.
23. Step 24) Check Circuit Continuity Turn ignition off. Check continuity in TP circuit between TP sensor connector and PCM connector terminal No. 89. Check continuity in SIG RTN circuit between TP sensor connector and PCM connector terminal No. 91. If continuity is present, replace TP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If continuity is not present, repair open circuit and repeat QUICK TEST.

Perform this test only when directed by QUICK TEST . This test is intended to diagnose the following

1. Wiring harness circuits (PSOM+ and PSOM-).
2. Powertrain Control Module (PCM).

PSOM Test Circuits & Connector Terminals. Scheme 19

1. Step 1) DTCs P0500, P0501, P0503 & P1500: Check Sensor & Wiring Harness DTC P0500 indicates a Vehicle Speed Sensor (VSS) is out of range. DTC P0501 indicates that ABS sensor is out of range. DTC P0503 indicates electrical noise problems. DTC P1500 indicates intermittent sensor circuit failure. Possible causes for these faults are: Wiring harness open or shorted circuits. Faulty rear ABS sensor. Faulty PSOM. Faulty Speed Control Module. Powertrain Control Module (PCM). Turn ignition off. Ensure rear ABS sensor and connector are correctly seated. Ensure wiring harness is not chafed, burnt or corroded. If any faults are found, service or repair as necessary. If no faults are found, go to next step.
2. Step 2) Check For Intermittent Circuit Fault Turn ignition off. Connect scan tester to DLC. Using scan tester, access VSS PID. Road test vehicle while recording VSS data. If possible, drive on rough, wet roads. Return to service area and review recorded PID data graph. If any blips are present, isolate fault in circuit. Repair as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no blips are present, go to next step.
3. Step 3) Check Signal To Module Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged and repair as necessary. Install EEC-V Breakout Box (014-00950). Connect PCM to breakout box. Set voltmeter on AC scale. Road test vehicle. Measure voltage between test pin No. 33 and 58 while gradually accelerating to 50 MPH. If maximum AC voltage is 4 volts or less, go to next step. If maximum AC voltage is more than 4 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Check Circuit Continuity Turn ignition off. Disconnect PCM from breakout box. Disconnect PSOM and speed control module. Inspect connectors for damaged and repair as necessary. Measure resistance of PSOM(-) circuit between wiring harness connector terminal and test pin No. 33 at breakout box. Measure resistance of PSOM(+) circuit between wiring harness connector terminal and test pin No. 58 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check Circuit For Short To Power & Ground Leave ignition off, PSOM and PCM disconnected. Measure resistance between test pin No. 58 and test pins No. 24, 33, and 77. If all resistance measurements are 10,000 ohms or more, fault is not in PSOM or related circuitry. Check instrument cluster, ABS or speed control system. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .

Perform this test only when directed by QUICK TEST . This test is intended to diagnose the following

1. Wiring harness circuits (MD and SIG RTN).
2. Faulty MD sensor.
3. Faulty Powertrain Control Module (PCM).

MD Test Circuits & Connector Terminals. Scheme 20

1. Step 1) DTC P0385 DTC P0385 indicates that self-test has detected a MD sensor/circuit failure. Possible causes for these faults are: Wiring harness open (MD or SIG RTN). MD circuit shorted to power or ground. Faulty MD sensor. Powertrain Control Module (PCM). If engine will start, go to next step. If engine will not start, no-start condition is not caused by DTC P0385. Service or repair as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
2. Step 2) Check For Intermittent Circuit Fault Clear all DTCs from PCM memory. Start engine and raise speed to 1500 RPM for 10 seconds 3 times. Turn ignition off. Connect scan tester to DLC. Using scan tester, retrieve all Continuous Memory DTCs. If DTC P0385 is present, go to step 5). If DTC P0385 is not present, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z, step 50). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 2) to step 5). No test procedures have been omitted.
3. Step 5) Check Circuit Continuity Turn ignition off. Disconnect MD wiring harness connector. Disconnect PCM 104-pin connector. Inspect connector for damaged and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of MD circuit between wiring harness connector terminal and test pin No. 59 at breakout box. Measure resistance of SIG RTN circuit between wiring harness connector terminal and test pin No. 6 at breakout box. If either resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 6) Check MD Circuit For Short To Power Leave MD sensor and PCM disconnected. Turn ignition on. Measure voltage between test pin No. 59 (MD) and test pins No. 51 and 103 (PWR GND) at breakout box. If both voltage measurements are 1.0 volt or less, go to next step. If either voltage measurement is more than 1.0 volt, repair circuit short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 7) Check MD Circuit For Short To Ground Leave MD sensor and PCM disconnected. Turn ignition off. Measure resistance between test pin No. 59 (MD) and test pins No. 6 (misfire RTN), 51 and 103 (PWR GND) at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If either resistance measurement less than 10,000, repair circuit short, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 8) Check For Short In PCM Leave ignition off and MD sensor disconnected. Connect PCM to breakout box. Measure resistance between test pin No. 59 (MD) and test pins No. 6 (mistefire RTN), 23 (IGN GND), 51, 103 (PWR GND), and 71 and 97 (VPWR) at breakout box. If each resistance measurement is 500 ohms or more, go to next step. If either resistance measurement is less than 500 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
7. Step 9) Check For Short In PCM Leave ignition off and PCM disconnected. Reconnect MD sensor. Set voltmeter on AC scale. Start engine and allow to idle. With engine idling, measure voltage between test pin No. 59 (MD) and test pins No. 51 and 103 (PWR GND) at breakout box. If AC voltage varies more than 0.1 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If AC voltage does not vary more than 0.1 volt, go to next step.
8. Step 10) Check MD Sensor Trigger Wheel Turn ignition off. Inspect MD sensor trigger wheel for damage. Ensure trigger wheel is not loose or misaligned. Service or repair as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If trigger wheel is okay, replace MD sensor and repeat QUICK TEST.

Perform this test only when directed by QUICK TEST . This test is intended to diagnose the following

1. Wiring harness circuits (CHT and SIG RTN).
2. Faulty CHT sensor.
3. Faulty Powertrain Control Module (PCM).

CHT Test Circuits & Connector Terminals. Scheme 21

CHT SENSOR SPECIFICATIONS (1)

1. Step 1) DTC P1288: DTC P1228 indicates CHT sensor is out of self-test range (1.2-3.7 volts). Possible causes for this fault are: Engine overheating. Low coolant level. Faulty sensor. Faulty sensor connector. Poor thermostat operation. Start engine and raise speed to 2000 RPM. Ensure upper radiator hose is warm and pressurized. Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . Check for DTC P1288. If DTC P1288 is not present, service code and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If DTC P1288 is present, go to next step.
2. Step 2) Check VREF Circuit Voltage Turn ignition off. Disconnect TP sensor. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.
3. Step 3) Check CHT Sensor Circuit Resistance Turn ignition off. Disconnect CHT sensor. Measure resistance between CHT sensor terminals. See «CHT SENSOR SPECIFICATIONS»(ref-23594-S07656901312001010300000) table. If resistance is within specification, go to next step. If resistance is not within specification, replace sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Leave CHT sensor disconnected. Start engine and raise speed to 2000 RPM. Measure resistance between CHT sensor terminals. See «CHT SENSOR SPECIFICATIONS»(ref-23594-S07656901312001010300000) table. If resistance is within specification, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is not within specification, replace sensor and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 10). No test procedures have been omitted.
5. Step 10) DTC P1289 This code indicates CHP sensor signal is greater than self-test maximum. Possible causes for this fault are: Open circuit. Faulty CHT sensor. Faulty PCM. Turn ignition off. Disconnect CHT sensor wiring harness connector. Inspect for damage and repair as necessary. Connect jumper wire between sensor terminals. Connect scan tester to DLC. Access CHT PID on scan tester. Turn ignition on. If PID voltage is less than 0.2 volts, replace CHT sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If PID voltage is 0.2 volts or more, remove jumper wire and go to next step. If scan tester is unable to access TP PID, go to next step.
6. Step 11) Check TP Circuit Continuity Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 66 (CHT) and CHT terminal of CHT sensor wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal of CHT sensor wiring harness connector. If either resistance measurement is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If both resistance measurements 5 ohms or more, repair open circuit, repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 20). No test procedures have been omitted.
7. Step 20) DTC P1290 This code indicates CHP sensor signal is less than self-test minimum. Possible causes for this fault are: Open or grounded circuit. Faulty CHT sensor. Faulty PCM. Turn ignition off. Disconnect CHT sensor wiring harness connector. Inspect for damage and repair as necessary. Connect scan tester to DLC. Access CHT PID on scan tester. Turn ignition on. If PID voltage more than 4.6 volts, replace CHT sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If PID voltage is 4.6 volts or less, remove jumper wire and go to next step. If scan tester is unable to access TP PID, go to next step.
8. Step 21) Check VREF Circuit Voltage With TP sensor disconnected, turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.
9. Step 22) Check Signal Circuit For Short To Ground Leave MD sensor and PCM disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 66 (CHT) and test pins No. 24, 51 (PWR GND), and 91 (SIG RTN) at breakout box. If each resistance measurement is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If either resistance measurement is less than 10,000 ohms, repair circuit short and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.
10. Step 90) Continuous Memory DTC P1289 Or P1290 These codes indicate intermittent CHT sensor failure. Possible causes for this fault are: Open or grounded circuit. Faulty IAT or ECT sensor. Low coolant level. Faulty PCM. Turn ignition off. Connect scan tester to DLC. Access CHT PID on scan tester. Turn ignition on. While observing CHT PID, lightly tap on CHT sensor to simulate road shock. Wiggle sensor connector. A fault is indicated by a sudden change of CHT PID voltage. If fault is indicated, isolate and repair as necessary. If fault cannot be isolated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no faults are indicated, go to next step.
11. Step 91) Check Wiring Harness With scan tester connected, and CHT PID still accessed, wiggle and shake small sections of wiring harness. A fault is indicated by a sudden change of voltage. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to next step.
12. Step 92) Check PCM Wiring Harness Turn ignition off. Disconnect CHT and PCM wiring harness connector. Inspect connector terminals for damage and repair as necessary. If no faults are found, problem cannot be located at this time. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If fault is found, repair as necessary and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.
13. Step 100) DTC P1299 This code indicates an engine overheat condition was detected by CHT sensor and fail-safe cooling strategy was activated by FMEM. Possible causes for this fault are: Cooling system fault. Low coolant level. Engine mechanical fault. Locate cooling system fault and repair as necessary. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .

Delayed engagement of transmission may be caused by mechanical malfunction. Harsh shifts and/or erratic speedometer reading may be caused by a failed speedometer or an open or intermittent ground within the instrument panel (electronic instrument cluster).

Perform this test when directed by QUICK TEST . This CIRCUIT TEST is intended to diagnose

1. Vehicle Speed Sensor (VSS).
2. VSS wiring harness circuits. (VSS+ and VSS-).
3. Powertrain Control Module (PCM).

VSS Circuit & Connector Terminals. Scheme 22

1. Step 1) DTC P0500 This code indicates PCM detected incorrect output from VSS sometime during vehicle operation. Possible causes for this code are: Faulty VSS. Open or shorted circuit. Faulty PCM. Turn ignition off. Disconnect VSS sensor. Remove PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 58 and VSS(+) terminal at VSS wiring harness connector. Measure resistance between test pin No. 33 and VSS(-) terminal at VSS wiring harness connector. If resistance readings are less than 5 ohms, go to next step. If either resistance reading is 5 ohms or more, repair open circuit in VSS wiring harness. Clear PCM memory and go to step 27).
2. Step 2) Check VSS Circuits For Shorts To Power Or Ground Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance as follows: Between test pin No. 33 and test pin No. 58 and 71 (VPWR). Between test pin No. 58 and test pins No. 24, 61, 76 and 103 (PWR GND). Between test pin No. 58 and test pins No. 71 (VPWR) and 91 (SIG RTN). If all readings are more than 500 ohms, go to next step. If any reading is 500 ohms or less, repair short in wiring harness. Clear PCM memory and go to step 27).
3. Step 3) Check VSS Resistance Turn ignition off. Disconnect VSS wiring harness connector. Measure resistance between VSS terminals. If resistance is not 190-250 ohms, replace VSS and go to step 27). If resistance is 190-250 ohms, replace PCM and go to step 27). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 5). No test procedures have been omitted.
4. Step 5) DTC P0500 This code indicates PCM detected incorrect output from VSS sometime during vehicle operation. Possible causes for this code are: Faulty VSS. Open or shorted circuit. Faulty PCM. Turn ignition off. Disconnect VSS sensor. Remove PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Check voltage between test pins No. 58 and 103 at breakout box while slowly rotating drive wheels. If voltage fluctuates 1.0-5.0 volts as wheels are rotated, replace PCM and go to step 27). If voltage does not fluctuate 1.0-5.0 volts, go to next step.
5. Step 6) Check VPWR To VSS Turn ignition off. Disconnect VSS wiring harness connector. Turn ignition on. Measure voltage at connector as follows: Between VPWR and PWR GND terminals. Between VSS+ and VSS- terminals. If voltage is 10.5 volts or more, go to next step. If voltage is 10.5 volts or less, go to step 10).
6. Step 7) Check VSS Circuits For Short To Power Turn ignition off. Ensure PCM and VSS are disconnected. Measure voltage between test pins No. 58 and 103 at breakout box. If voltage is less than 1.0 volt, go to next step. If voltage is 1.0 volt or more, repair short to power and go to step 27).
7. Step 8) Check VSS Circuits For Short To Ground Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance between test pin No. 58 and 103 at breakout box. If resistance is more than 3000 ohms, go to next step. If resistance is 3000 ohms or less, repair short to ground and go to step 27).
8. Step 9) Check VSS Circuit Continuity Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance between test pin No. 58 and the VSS or VSS+ terminal at VSS wiring harness connector. If all resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and go to step 27).
9. Step 10) Check VSS Ground Circuit Continuity Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance between chassis ground and PWR GND or VSS(-) terminal at VSS wiring harness connector. If resistance is less than 5 ohms, repair open in power circuit to VSS and go to step 27). If resistance is 5 ohms or more, repair open in ground circuit and go to step 27). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 15). No test procedures have been omitted.
10. Step 15) KOER DTC P1500: Check PCM VSS PID For Input Signal This code indicates VSS input signal is out of range. A DTC 1501 will be set and self-test will abort whenever PCM detects VSS input signal during KOER self-test. Possible causes for this code are: Noisy VSS input signal from RFI/EMI external source (ignition wires, charging circuits etc.). Turn ignition off. Connect scan tester to DLC. Start engine and allow to idle. Using scan tester, access VSS PID and observe vehicle speed input to PCM. While observing VSS PID, increase engine speed to 2000 RPM and decrease to idle several times. If VSS PID reading is less than 3 MPH, fault cannot be duplicated at this time. Testing is complete. If VSS PID reading 3 MPH or more, go to step 22). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 20). No test procedures have been omitted.
11. Step 20) Continuous Memory P0503: Check For Intermittent Fault This code indicates poor VSS performance. Possible causes for this code are: Noisy VSS input signal from RFI/EMI external source (ignition wires, charging circuits etc.). Damaged circuit. Faulty VSS. Faulty VSS gear(s). Turn ignition off. Disconnect VSS sensor. Visually inspect VSS and VSS circuits for potential faults as follows: Loose VSS circuit connectors. Loose VSS circuit connector pins. Damaged VSS wiring harness insulation. Incorrect VSS circuit routing. Incorrect VSS installation. If no faults are found, go to next step. If faults are found, repair or replace as necessary. Clear PCM memory and go to step 27).
12. Step 21) Check PCM VSS PID For Input Signal Turn ignition off. Connect scan tester to DLC. Test drive vehicle, averaging 30 MPH. While driving at a steady speed, check for VSS PID variations of more than 5 MPH for 10 seconds or more. If any variations occur, go to next step. If variations do not occur, fault cannot be duplicated at this time. Testing is complete.
13. Step 22) Visually inspect VSS wiring harness. Ensure wiring is not routed near ignition wires or alternator wires. Verify VSS wiring harness is shielded and grounded (if applicable). Repeat step 1) to verify circuit continuity. If faults are found, repair or replace as necessary. Clear PCM memory and go to step 27). If no faults are found, fault cannot be duplicated at this time. Testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 25). No test procedures have been omitted.
14. Step 25) DTC P1500 This code indicates PCM detected intermittent input from VSS. Possible causes for this code are: Intermittent open or shorted circuit. Faulty VSS. Faulty PCM. Turn ignition off. Disconnect VSS sensor. Visually inspect VSS and VSS circuits for potential faults as follows: Loose VSS circuit connectors. Loose VSS circuit connector pins. Damaged VSS wiring harness insulation. Incorrect VSS circuit routing. Incorrect VSS installation. If no faults found, go to CIRCUIT TEST Z. If faults found, repair or replace as necessary. Clear PCM memory and go to step 27). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 25) to step 27). No test procedures have been omitted.
15. Step 27) VSS Drive Cycle Record and clear continuous memory codes. Warm engine to normal operating temperature. Perform appropriate drive cycle as follows: On models with A/T, place gear selector in Drive position. Accelerate hard to 35 MPH and coast down to a stop. Repeat procedure 3 times. Shut off engine. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . Service codes as necessary. If no codes are present, testing is complete. On models with M/T, start in first gear, shifting no higher than second gear. Accelerate moderately to 40 MPH. Coast down to idle, and stop. Repeat procedure 3 times. Shut engine off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . Service codes as necessary. If no codes are present, testing is complete.

CID signal provides PCM information for fuel injector synchronization. The CID signal originates from Camshaft Position (CMP) sensor.

Enter this CIRCUIT TEST only when instructed during QUICK TEST . This test is only intended to diagnose the following

1. CID, PWR GND, SIG RTN and VPWR wiring harness circuits.
2. Faulty Camshaft Position (CMP) sensor.
3. Faulty Powertrain Control Module (PCM).

CID Wiring Harness Circuits. Scheme 23

1. Step 1) DTC P0340 This code indicates error has been detected in CMP sensor circuit. Possible causes for this fault are: CID circuit open or shorted wiring harness. PWR GND or VPWR circuit open (Hall Type CMP). SIG RTN circuit open (Variable Reluctance Type CMP). Faulty CMP sensor. Faulty ICM. Faulty PCM. If engine starts, go to step 2). If engine does not start, go to CIRCUIT TEST A.
2. Step 2) Attempt To Generate DTC P0340 Clear PCM memory. Start engine. Raise engine speed to 1500 RPM for 10 seconds. Return to idle speed. Raise speed to 1500 RPM for 10 seconds again. Turn ignition off. Perform «QUICK TEST»(ref-23594-S34023665322001010300000) to retrieve Continuous Memory DTCs. If DTC P0340 is not present, go to CIRCUIT TEST Z. If DTC P0340 is present, go to step 3) for Hall Type or step 5) for Variable Reluctance Type.
3. Step 3) Check VPWR Circuit Voltage Turn ignition off. Disconnect CMP wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at CMP sensor wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage less than 10.5 volts, repair open in VREF circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Check PWR GND To CMP Sensor Turn ignition off. Ensure CMP sensor is disconnected. Measure resistance between PWR GND circuit at CMP sensor wiring harness connector and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit. Clear PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check Continuity Of CID Circuits Leave ignition off. Disconnect PCM 104-pin connector. Inspect for damaged terminals and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 85 (CID) at breakout box and CID terminal at CMP sensor wiring harness connector. On all variable reluctance type, also measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal at CMP sensor wiring harness connector. If each resistance measurement is less than 5 ohms, go to next step. If either resistance is 5 ohms or more, repair open circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 6) Check CID Circuit For Short To Power Leave CMP sensor disconnected. Turn ignition on. Measure voltage between test pin No. 85 and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is less 1.0 volt, go to next step. If voltage is 1.0 volt or more, repair CID circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
7. Step 7) Check CID Circuit For Short To Ground Turn ignition off. Leave CMP sensor and PCM disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 85 and test pins No. 51, 103 (PWR GND) and 91 (SIG RTN) at breakout box. If resistance is 10,000 or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair short to ground or SIG RTN in CID circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 8) Check For Short In PCM Leave ignition off and CMP sensor disconnected. Connect PCM to breakout box. Measure resistance between test pin No. 85 and test pins No. 23, 51, 71, 91, 97 and 103 at breakout box. If each resistance measurement is 500 ohms or more, go to next step for Variable Reluctance type CMP or step 10) for Hall type CMP. If any resistance measurement is less than 500 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
9. Step 9) Check CMP Sensor Output Turn ignition off. Reconnect CMP sensor wiring harness connector. Set DVOM on AC scale to monitor less than 5 volts. Start engine. Measure voltage between test pins No. 85 and test pins No. 51 and 103 while varying engine speed. If voltage varies more than 0.1 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage does not vary more than 0.1 volt, replace CMP sensor and repeat QUICK TEST.
10. Step 10) Check CMP Sensor Output Turn ignition off. Disconnect PCM. Reconnect CMP sensor wiring harness connector. Using starter, bump engine ( DO NOT allow engine to start) for at least 10 engine revolutions. Measure voltage between test pins No. 85 and test pins No. 51 and 103. If voltage switches from below 2 volts to more than 8 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage does not switch as specified, replace CMP sensor and repeat QUICK TEST.

Perform this test when directed by QUICK TEST . This CIRCUIT TEST is intended to diagnose

1. ACP sensor.
2. ACP wiring harness circuits (ACP, VREF and SIG RTN).
3. Powertrain Control Module (PCM).

ACP Sensor Test Circuit & Connector Terminals. Scheme 24

1. Step 1) DTC P1461 This code indicates PCM has detected high voltage in ACP circuit. Possible causes for this code are: Faulty ACP sensor. Open or shorted circuit. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to DLC. Turn ignition on. Access ACP V PID. If ACP V PID voltage is more than 4.9 volts, go to next step. If ACP V PID voltage is 4.9 volts or less, fault is intermittent. Go to step 18).
2. Step 2) Check VREF & SIG RTN Circuit Turn ignition off. Disconnect ACP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF connector terminals. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range or SIG RTN is open. Go to CIRCUIT TEST C.
3. Step 3) Induce Opposite Signal Turn ignition off. Leave ACP sensor disconnected. Connect scan tester to DLC. Using scan tester, access ACP V PID. If voltage between ACP V voltage is less than 4.9 volts, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If ACP V voltage is 4.9 volts or more, go to next step.
4. Step 4) Check ACP Circuit For Short To VREF Turn ignition off. Leave ACP sensor disconnected. Disconnect scan tester from DLC. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Measure resistance between ACP terminal and VREF terminal at ACP connector. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair ACP circuit short to VREF. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check ACP Circuit For Short To Power Leave ACP sensor and PCM disconnected. Measure voltage between ACP terminal at ACP connector and chassis ground. If voltage is less than one volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is one volt or more, repair ACP circuit short to power. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat QUICK TEST.
6. Step 6) Check Circuit Continuity Turn ignition off. Leave ACP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 86 (ACP) and ACP terminal of ACP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
7. Step 7) Check PCM Turn ignition off. Connect PCM to breakout box. Leave ACP sensor disconnected. Connect jumper wire between test pin No. 86 and 91 (SIG RTN) at breakout box. Connect scan tester to DLC. Using scan tester, access ACP V PID (if scan tester is unable to communicate, follow YES path). Turn ignition on. If ACP V PID voltage is less than 4.9 volts, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If ACP V PID voltage is 4.9 volts or more, replace PCM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 10). No test procedures have been omitted.
8. Step 10) DTC P1462 This code indicates PCM has detected low voltage in ACP circuit. Possible causes for this code are: Faulty ACP sensor. Open or shorted circuit. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to DLC. Turn ignition on. Access ACP V PID. If ACP V PID voltage is less than .15 volt, go to next step. If ACP V PID voltage is .15 volt or more, fault is intermittent. Go to step 18).
9. Step 11) Check VREF Circuit At ACP Sensor Turn ignition off. Disconnect ACP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF connector terminals. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range. Go to CIRCUIT TEST C.
10. Step 12) Induce Opposite Signal Turn ignition off. Leave ACP sensor disconnected. Connect scan tester to DLC. Connect jumper wire between ACP terminal and VREF terminal at connector. Turn ignition on. Access ACP V PID (if scan tester cannot access ACP V PID, go to next step). If ACP V PID voltage is less than 4 volts, go to next step. If ACP V PID voltage is 4 volts or more, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
11. Step 13) Check ACP Circuit For Short To Ground Or SIG RTN Leave ignition off and ACP sensor disconnected. Disconnect scan tester from DLC. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Measure resistance between ACP terminal and SIG RTN terminal at ACP connector. Measure resistance between ACP terminal at ACP connector and negative battery terminal. If both resistance measurements are 10,000 ohms or more, go to next step. If either resistance measurements are less than 10,000 ohms, repair short circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
12. Step 14) Check ACP Circuit Continuity Leave ignition off. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 86 (ACP) at breakout box and ACP terminal at ACP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ACP circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
13. Step 15) Check A/C Clutch Engagement Turn ignition on. Reconnect ACP sensor. Turn A/C switch on while listening for A/C clutch engagement. If A/C clutch engages when A/C switch is turned on, replace PCM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If A/C clutch does not engage when ignition is turned on, ensure system has correct refrigerant charge. Service A/C system if necessary. If A/C system has correct refrigerant charge, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 18). No test procedures have been omitted.
14. Step 18) Check Wiring Harness & Sensor With scan tester connected, turn ignition on. Access ACP V PID. While observing ACP V PID, lightly tap on ACP sensor to simulate road shock. Wiggle sensor connector and wiring harness. A fault is indicated by a sudden change of voltage. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 20). No test procedures have been omitted.
15. Step 20) DTC P1463 This code indicates PCM has detected that ACP sensor did not detect sufficient change in A/C system pressure when A/C switch was turned on. Possible causes for this code are as follows: A/C system mechanical malfunction. A/C system electrical malfunction (non-EEC related). A/C clutch continuous engagement. ACP V or VREF open circuit. Faulty ACP V sensor. Turn A/C and defroster off. Start engine and allow to idle. Attempt to disengage A/C clutch. If A/C clutch disengages, go to next step. If A/C clutch does not disengage, repair or replace A/C compressor.
16. Step 21) Check Power & Ground To A/C Clutch Turn ignition off. Disconnect A/C cycling switch. Connect jumper wire between A/C cycling switch connector terminals. Disconnect A/C clutch. Connect non-powered test light to A/C clutch connector terminals. Start engine and allow to idle. Turn A/C switch on. Monitor test light for 15 seconds. Turn ignition off. If test light comes on or A/C can be heard clicking, fault is mechanical and EEC testing is complete.

Perform this test when directed by QUICK TEST or other test procedures. This test is intended to diagnose the following

1. PSP sensor.
2. PSP, SIG RTN and VREF wiring harness circuits.
3. Powertrain Control Module (PCM).

PSP Sensor Test Circuit & Connector Terminals. Scheme 25

1. Step 1) Verify Operator Interaction DTC P0552 indicates PSP sensor circuit is shorted to ground. DTC P0553 indicates PSP sensor circuit is shorted to power. DTC P1550 indicates PSP sensor circuit is out of self-test range. Possible causes for this fault are: Damaged PSP sensor. Open or shorted SIG RTN circuit. Open or shorted VREF circuit. Open or shorted PSP sensor signal circuit. Faulty Powertrain Control Module (PCM). Ensure steering wheel was turned at least 1/2 turn within 1-2 seconds after ID portion of test. If steering wheel was turned, go to next step. If steering wheel was not turned, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
2. Step 2) Check VREF Circuit Voltage Turn ignition off. Disconnect PSP sensor connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Turn ignition on. Measure voltage between VREF circuit terminal and SIG RTN circuit terminal at PSP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
3. Step 3) Check PCM Response Start engine and allow it to idle. Connect a jumper wire between VREF circuit terminal and PSP sensor circuit terminal at PSP sensor wiring harness connector. If engine speed increased, reconnect PSP sensor connector and go to next step. If engine speed did not increase, go to step 5).
4. Step 4) Check PSP Sensor Operation Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM connected. Start engine and allow it to idle. Connect voltmeter between test pins No. 31 and 91 at breakout box. Observe voltmeter and turn steering wheel all the way to the left then all the way to the right. If voltage changes from 0.5-4.5 volts, PSP circuit is functioning properly. Fault is intermittent. Go to CIRCUIT TEST Z. If voltage does not change from 0.5-4.5 volts, replace PSP sensor. Remove breakout box and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check PSP Sensor Circuit Continuity Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Ensure PSP sensor is disconnected. Perform the following procedures: Measure resistance between PSP sensor circuit terminal at PSP sensor wiring harness connector and test pin No. 31 at breakout box. Measure resistance between VREF circuit terminal at PSP sensor wiring harness connector and test pin No. 90 at breakout box. Measure resistance between SIG RTN circuit at PSP sensor wiring harness connector and test pin No. 91 at breakout box. If each reading is less than 5 ohms, go to next step. If any reading is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 6) Check For Short To Power Or Ground Leave PCM and PSP sensor disconnected. Measure resistance between chassis ground and test pin No. 31, 90 and 91 at breakout box. If each reading is more than 10,000 ohms, replace PCM. Remove breakout box and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If any reading is 10,000 ohms or less, repair short to power or short to ground. Remove breakout box and repeat QUICK TEST.

Perform this test when directed by QUICK TEST . This CIRCUIT TEST is intended to diagnose

1. PTO wiring harness circuit.
2. Powertrain Control Module (PCM).

PT0 Test Circuit & Switch Schematic. Scheme 26

1. Step 1) Check PTO Switch For Short To Power PTO signals PCM that additional load is being applied to engine. If PTO circuit failure occurs, a fault code may be set. Possible causes for this code are: PTO circuit shorted to power. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect PTO switch wiring harness connector. Connect scan tester to DLC. Turn ignition on. Access PTO STAT PID. If PTO STAT PID is on, go to next step. If PTO STAT PID is off, repair or replace switch as necessary. Road test vehicle and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
2. Step 2) Check PTO Circuit For Short To Power Leave ignition off and PTO switch disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Measure voltage test pin No. 4 and test pins No. 51 and 103 at breakout box. If voltage is less than one volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is one volt or more, repair circuit short to power and repeat QUICK TEST.
3. Step 3) MIL On: Check PTO PID Turn ignition off. Connect scan tester to DLC. Turn ignition on. Access PTO STAT PID. If PTO STAT PID is available and displaying on or off, go to next step. If PTO STAT PID is not as specified, go to step 9).
4. Step 4) Check PTO Circuit With Scan Tester With ignition on and PTO STAT PID accessed, cycle PTO switch. If PTO STAT PID cycles on, delays, and then cycles off, PTO input is okay and testing is complete. If PTO STAT PID does not cycle as specified, go to next step.
5. Step 5) Check PTO Circuit For Short To Ground Turn ignition off. Leave PTO switch disconnected. Disconnect scan tester from DLC. Measure resistance between chassis ground and PTO circuit terminal at PTO switch connector. If resistance is 10,000 ohms or less, go to next step. If resistance is more than 10,000 ohms, go to step 7).
6. Step 6) Isolate Short To Chassis Ground Leave ignition off and PTO sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 4 (PTO) and test pins No. 77 and 103 at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance 10,000 ohms or less, repair PTO circuit short to chassis ground, repeat QUICK TEST.
7. Step 7) Leave ignition off and PTO sensor disconnected. Connect scan tester to DLC. Connect jumper wire between positive battery terminal and PTO terminal at PTO switch wiring harness connector. Turn ignition on. Access PTO STAT PID. If PTO STAT PID is on, PTO input is okay and testing is complete. Check switch for malfunction and repair as necessary. If PTO STAT PID is off, go to next step.
8. Step 8) Check Circuit Continuity Leave ignition off and PTO sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 4 (PTO) and PTO circuit terminal at PTO switch connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, repair open in PTO circuit and repeat QUICK TEST.
9. Step 9) Perform KOEO and KOER self-test. If any DTCs are present, repair as necessary. If no DTCs are present, go to next step.
10. Step 10) Road test vehicle under various conditions. Retrieve all Continuous Memory DTCs and service as necessary. If no DTCs are present, fault cannot be duplicated at this time. If symptom is still present, go to CIRCUIT TEST Z.

Perform this test when directed by QUICK TEST . This test is intended to diagnose a faulty BOO switch, circuit or PCM. To prevent replacement of good components, be aware following non-EEC related areas may be at fault

1. Brakelight bulb.
2. Brakelight switch or brakelight fuse.

BOO Switch Circuit. Scheme 27

1. Step 1) DTC P1703: Verify Brake Pedal Was Depressed This code indicates that when brake pedal is applied during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) , BOO signal did not cycle high and low. Possible causes for this fault are as follows: Brake pedal not applied during self-test. Brake pedal applied during entire self-test. Open brakelight circuit. Short to ground or power. Faulty brakelight switch. Faulty Powertrain Control Module (PCM). If brake was not applied during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) , repeat test. Depress and release brake pedal only once during test. If pedal was depressed, go to next step.
2. Step 2) DTC P1703 This code indicates that voltage was present at BOO circuit during «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . Possible causes for this fault are as follows: Brake pedal applied during KOEO SELF-TEST. BOO circuit short to power. Faulty brakelight switch. If brake was applied during KOEO SELF-TEST, repeat test. If pedal was not depressed, go to next step.
3. Step 3) Check Operation Of Brakelights With ignition on, check operation of brakelights. If brakelights operate normally, go to next step. If brakelights do not operate, go to step 5). If brakelights are always on, go to step 7).
4. Step 4) Check For BOO PID Cycling Turn ignition off. Connect scan tester to DLC. Using scan tester, access BOO PID. Apply and release brake several times while observing BOO PID. If BOO PID voltage does not cycle on and off, go to step 10). If BOO PID voltage cycles, go to step 10) under CIRCUIT TEST Z.
5. Step 5) Check For Power To Brakelight Switch Ensure related fuses and brakelight bulbs are in good condition. Turn ignition off. Disconnect brakelight switch (located on brake pedal). Measure voltage between B+ input to brakelight switch and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in B+ circuit to brakelight switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 6) Check Brakelight Switch With brakelight switch disconnected, measure resistance between switch terminals. If resistance is 5 ohms or more, replace brakelight switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 5 ohms, repair open circuit between switch and stoplight ground and repeat QUICK TEST.
7. Step 7) Verify Brake Switch Is Not Always Closed Turn ignition off. Disconnect brakelight switch (located on brake pedal). Turn ignition on. If brakelights are still on, go to next step. If brakelights are not on, verify correct installation of brakelight switch. If installation is okay, replace brakelight switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 8) Check For Short To Power In PCM Turn ignition off. Disconnect PCM. Turn ignition on. Check brakelights. If brakelights are on, go to next step. If brakelights are off, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
9. Step 9) Check For Short To Power In Shift Lock Actuator Turn ignition off. Ensure PCM and brakelight switch are disconnected. Disconnect shift lock actuator, cruise control module and ABS module (if equipped). Turn ignition on. If brakelights are still on, repair short to power in BOO circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If brakelights are off, repair short circuit in shift lock actuator circuit, cruise control system circuit or ABS circuit. Reconnect all components and repeat QUICK TEST.
10. Step 10) Check For BOO PID Cycling Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Using DVOM, measure voltage between test pin No. 92 and test pins No. 51 and 77 while applying and releasing brake. If voltage cycles on and off, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage does not cycle, repair open in BOO circuit between PCM and BOO circuit connection splice to B+ circuit.

Electrical load inputs are used for idle speed control strategy so correct idle can be maintained regardless of electrical demands on engine. PCM uses blower motor, headlights, rear window defroster, and daytime running lights (if equipped) to determine electrical load status.

Perform this test when directed by QUICK TEST or if directed by other test procedures. This CIRCUIT TEST is intended to diagnose

1. Blower (BLR) motor input circuit.
2. Daytime Running Lights (DRL) input circuit.
3. Headlight (HDL) input circuit.
4. Rear window Defroster (DEF) input circuit.
5. Powertrain Control Module (PCM).

SWITCH CIRCUIT LOGIC

1. Step 1) Isolate Faulty System If idle speed fault occurs when blower motor is on, go to step 10). If idle speed fault occurs when daytime running lights are on, go to step 20). If idle speed fault occurs when headlights are on, go to step 30). If idle speed fault occurs when rear window defroster is on, go to step 40). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 10). No test procedures have been omitted.
2. Step 10) Check Blower Motor Switch (Low Speed) Turn ignition and all accessories off. Remove PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Turn climate control motor switch to low-speed position "1" or "2". Measure voltage between chassis ground and test pin No. 10 at breakout box. If voltage is not 10-17 volts, go to step 13). If voltage is 10-17 volts, go to next step.
3. Step 11) Check Blower Motor Switch (High Speed) Turn ignition and all accessories off. Turn climate control motor switch to high-speed position "3" or "4". Turn ignition on. Measure voltage between chassis ground and test pin No. 10 at breakout box. If voltage is less than 1.5 volts, replace PCM and confirm idle speed fault has been corrected. If voltage is 1.5 volts or more, go to next step.
4. Step 12) Check Blower Circuit For Short To Power Turn ignition off. Disconnect high speed blower motor relay connector. Relay is located behind right side of instrument panel on blower assembly. Measure resistance between test pin No. 10 and test pins No. 71 and 91 at breakout box. If all readings are more than 10,000 ohms, check for damaged blower motor switch or relay. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected.
5. Step 13) Check Blower Circuit Continuity Turn ignition off. Disconnect blower motor relay. Measure resistance between BLR terminal at power distribution box and test pin No. 10 at breakout box. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected. If resistance is less than 5 ohms, go to next step.
6. Step 14) Check Blower Circuit For Short To Ground Turn ignition off. Disconnect high speed blower motor relay. Measure resistance between test pin No. 10 and test pins No. 23, 76 and 91 at breakout box. If all readings are more than 10,000 ohms, check for damaged blower motor switch or relay. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 20). No test procedures have been omitted.
7. Step 20) Check DRL Circuit Voltage (Headlights On) Turn ignition off. Disconnect PCM 60-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (014-000950), leaving PCM disconnected. Apply parking brake. Turn ignition on. Turn headlights on. Turn accessories off. Measure voltage between chassis ground and test pin No. 14 at breakout box. If voltage is not 10-17 volts, go to step 23). If voltage is 10-17 volts, go to next step.
8. Step 21) Check DRL Circuit Voltage (Headlights Off) Turn headlights off. Release parking brake. Turn ignition on. Measure voltage between chassis ground and test pin No. 14 at breakout box. If voltage is less than 1.5 volts, replace PCM. Remove breakout box and confirm idle speed fault has been corrected. If voltage is 1.5 volts or more, go to next step.
9. Step 22) Check DRL Circuit For Short To Power Turn ignition off. Ensure PCM is disconnected. Disconnect daytime running lights relay. Measure resistance between test pin No. 14 and test pins No. 71 and 97 at breakout box. If all readings are more than 10,000 ohms, check daytime running lights module for malfunction. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected.
10. Step 23) Check DRL Circuit Continuity Turn ignition off. Disconnect daytime running lights relay. Measure resistance between DRL circuit terminal at DRL wiring harness connector and test pin No. 14 at breakout box. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected. If resistance is less than 5 ohms, go to next step.
11. Step 24) Check DRL Circuit For Short To Ground Turn ignition off. Measure resistance between test pin No. 14 and test pins No. 23, 76 and 103 at breakout box. If all readings are more than 10,000 ohms, check daytime running lights module for malfunction. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 24) to step 30). No test procedures have been omitted.
12. Step 30) Check Headlight Circuit Voltage (Headlights Off) Turn ignition off. Remove PCM 60-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (014-000950), leaving PCM disconnected. Turn all accessories off. Turn ignition on. Measure voltage between chassis ground and test pin No. 49 at breakout box. If voltage is 1.5 volts or more, go to step 34). If voltage is less than 1.5 volts, go to next step.
13. Step 31) Check Headlight Circuit Voltage (Headlights On) Turn all accessories off. Turn ignition on. Turn headlights on. Measure voltage between chassis ground and test pin No. 49 at breakout box. If voltage is 10-17 volts, replace PCM. Remove breakout box and confirm idle speed fault has been corrected. If voltage is not 10-17 volts, go to next step.
14. Step 32) Check HDL Circuit Continuity Turn ignition off. Disconnect headlight relay. Relay is located in engine compartment relay box. Measure resistance between HDL circuit terminal at power distribution box and test pin No. 49 at breakout box. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected. If resistance is less than 5 ohms, go to next step.
15. Step 33) Check HDL Circuit For Short To Ground Turn ignition off. Disconnect headlight relay. Measure resistance between test pin No. 49 and test pins No. 23, 76 and 91 at breakout box. If all readings are more than 10,000 ohms, check headlight switch for malfunction. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected.
16. Step 34) Check HDL Circuit For Short To Power Turn ignition off. Disconnect headlight relay. Measure resistance between test pin No. 49 and test pins No. 71 and 97 at breakout box. If all readings are more than 10,000 ohms, check headlight switch for malfunction. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 34) to step 40). No test procedures have been omitted.
17. Step 40) Check DEF Circuit Voltage (Defrost Off) Turn ignition off. Turn all accessories off. Remove PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between chassis ground and test pin No. 66 at breakout box. If voltage 10-17 volts, go to next step. If voltage is not 10-17 volts, go to step 43).
18. Step 41) Check DEF Circuit Voltage (Defrost On) Turn ignition on. Turn rear window defroster on. Measure voltage between chassis ground and test pin No. 66 at breakout box. If voltage is less than 3 volts, replace PCM. Remove breakout box and confirm idle speed fault has been corrected. If voltage is 3 volts or more, go to next step.
19. Step 42) Check DEF Circuit For Short To Power Turn ignition off. Disconnect rear window defroster relay. Relay is located in left side of trunk. Measure resistance between test pin No. 66 and test pins No. 71 and 97 at breakout box. If all readings are more than 10,000 ohms, check DEF switch or relay for malfunction. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected.
20. Step 43) Check DEF Circuit Continuity Leave ignition off and rear window defroster switch disconnected. Measure resistance between DEF circuit terminal at power distribution box connector and test pin No. 23 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected.
21. Step 44) Check DEF Circuit For Short To Ground Leave ignition off and rear window defroster switch disconnected. Measure resistance between test pin No. 66 and test pins No. 23, 76 and 91 at breakout box. If all readings are more than 10,000 ohms, check DEF switch and relay circuit for malfunction. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components, and confirm idle speed fault has been corrected.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Some vehicles may not have power steering, but PCM may be equipped with PSP switch software strategy. If a KOEO DTC P1650 or P1651 is displayed, check if vehicle is equipped with power steering. If vehicle is not equipped with power steering, disregard DTC P1650 or P1651. This test is only intended to diagnose

1. Wiring harness circuits (SIG RTN and PSP).
2. PSP switch.
3. Powertrain Control Module (PCM).

PSP Test Circuit & Connector Terminals. Scheme 28

1. Step 1) DTC P1650 Or P1651 DTC P1650 indicates PSP signal is out of self-test range. DTC P1651 indicates PSP signal malfunction. Possible causes for this fault are as follows: Open or short in wiring harness. Faulty PSP switch. Faulty PSP switch/shorting bar damage. Faulty Powertrain Control Module (PCM). Start engine and allow to idle. Using scan tester, access PSP PID (if scan tester cannot access PSP PID, go to next step). Turn steering wheel left, then right. If scan tester does not indicate on/off switching, go to step 3). If scan tester indicates on/off switching, go to CIRCUIT TEST Z.
2. Step 2) Check PSP Switch Operation Turn ignition off. Install tachometer. Start engine and allow to idle. Disconnect PSP switch. If engine speed increases when switch is disconnected, replace switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If engine speed does not increase when switch is disconnected, go to next step.
3. Step 3) Check PSP Switch Operation Turn ignition off. Install tachometer. Start engine and allow to idle. Disconnect PSP switch. Connect jumper wire between PSP terminal and SIG RTN terminal of connector. If engine speed increases when switch disconnected, replace switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If engine speed does not increase when switch disconnected, see step 4).
4. Step 4) Check PSP Circuit Continuity Turn ignition off. Leave PSP switch disconnected. Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of PSP switch connector. If resistance less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check For Short In PSP Circuit Leave ignition off and PSP switch disconnected. Measure resistance between test pin No. 31 (PSP) and 91 at breakout box. Measure resistance between test pin No. 31 and chassis ground. If both resistance measurements are 10,000 ohms or more, go to step 7). If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 6) Check Switch Resistance Turn ignition off. Start engine and allow to idle. Disconnect PSP switch. Measure resistance between PSP switch signal and chassis ground while turning steering wheel. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, replace PSP switch and repeat QUICK TEST.
7. Step 7) Check Switch Resistance Turn ignition off. Start engine and allow to idle. Disconnect PSP switch. Measure resistance between PSP switch terminals. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance 5 ohms or more, replace PSP switch and repeat QUICK TEST.

Enter this test when directed by QUICK TEST . This test is only intended to diagnose

1. Harness circuits (SIG RTN and OCT ADJ).
2. Octane adjust shorting bar connector.

Purpose of Octane Adjust Shorting Bar is to provide optimum spark advance for fuel used. If engine detonates (spark knock), remove Octane Shorting Bar. This retards spark advance about 3-4 degrees. If engine continues to detonate, use fuel with a higher octane rating.

Octane Adjust Components. Scheme 29

Octane Adjust Circuit. Scheme 30

1. Step 1) DTC P1390 This code indicates Octane Adjust (OCT ADJ) shorting bar is not in place or OCT ADJ circuit is open. Turn ignition off. Inspect Octane Adjust in-line connector. If shorting bar has been removed, go to next step. If shorting bar is in place, go to step 4).
2. Step 2) Check For Modification Decal If vehicle has modification decal indicating OCT ADJ shorting bar was removed as a factory authorized procedure, testing is complete. If engine is detonating, go to «TESTS W/O CODES - 4.9L»(ref-23707) article. If vehicle does not have modification decal, go to next step.
3. Step 3) Check For DTC P1390 Replace OCT ADJ shorting bar. Perform «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If DTC P1390 is present, go to next step. If DTC P1390 is not present, testing is complete. If there are no codes and driveability faults are present, go to «TESTS W/O CODES - 4.9L»(ref-23707) article.
4. Step 4) Check Octane Adjust Circuit Continuity Continuity should exist from OCT ADJ circuit, through in-line connector and shorting bar, to SIG RTN circuit. Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 30 (OCT ADJ) and 91 (SIG RTN) at breakout box. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, repair open OCT ADJ circuit, shorting bar or SIG RTN circuit. Repeat QUICK TEST.
5. Step 5) Check For DTC P1390 Start engine. Warm it to normal operating temperature. Turn ignition off. Perform «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If DTC P1390 is not present, go to next step. If DTC P1390 is present, return to step 1).
6. Step 6) Verify In-Line Shorting Bar Is Installed Turn ignition off. Inspect OCT ADJ in-line connector. If shorting bar is installed, go to step 8). If shorting bar is not installed, go to next step.
7. Step 7) Check For Modification Decal If vehicle has modification decal indicating OCT ADJ shorting bar was removed as a factory authorized procedure, go to step 10). If vehicle does not have a modification decal, replace shorting bar. If engine is detonating, go to «TESTS W/O CODES - 4.9L»(ref-23707) article.
8. Step 8) Check For Technical Service Bulletin (TSB) If a TSB authorizing removal of OCT ADJ shorting bar exists, go to next step. If authorizing TSB does not exist, testing is complete. If engine detonating, go to «TESTS W/O CODES - 4.9L»(ref-23707) article.
9. Step 9) Remove OCT ADJ Shorting Bar Turn ignition off. Remove OCT ADJ shorting bar. Test drive vehicle to verify complaint. If detonation is present, go to next step. If detonation is not present, testing is complete.
10. Step 10) Check Octane Adjust Circuit For Short To Ground Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between OCT ADJ terminal at in-line connector and test pins No. 51, 91 and 103 at breakout box. If each resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit. If engine is still detonating, go to «TESTS W/O CODES - 4.9L»(ref-23707) article.
11. Step 11) Check PCM Turn ignition off. Disconnect OCT ADJ shorting bar. Connect PCM to breakout box. Turn ignition on. Measure voltage between breakout box OCT ADJ terminal of in-line connector and test pins No. 51 and 103. If voltage is less than 4 volts, replace PCM. If voltage is 4 volts or more, remove breakout box. If engine is still detonating, go to «TESTS W/O CODES - 4.9L»(ref-23707) article.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Only use this test to diagnose the following

1. HO2S and sensor connection.
2. Vacuum systems.
3. Fuel injector and/or fuel injector circuitry.
4. Powertrain Control Module (PCM).
5. Electrical circuits (HO2S, HO2S GND, INJ 1-8, VPWR and SIG RTN).

Note. HO2S may be displayed on scan tester as 02S.

To prevent replacement of good components, be aware the following non-EEC areas may be cause of driveability concerns

1. Ignition system.
2. Faulty evaporative emission system.
3. EGR and/or PCV system.
4. Air intake system.
5. Engine oil contamination.
6. Fuel system.
7. Exhaust system leaks or restriction.
8. Engine cooling system.

CIRCUIT TEST ACRONYMS

HO2S Connector Terminal. Scheme 31

Fuel Injector Connector Terminals. Scheme 32

Locating HO2S. Scheme 33

HO2S TEST PIN IDENTIFICATION (1)

Note. Test procedure begins with step 20). No test procedures have been omitted.

1. Step 20) Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) If DTC P1127, P1128 or P1129 are present, service before proceeding. If specified DTCs are not present, go to next step.
2. Step 21) DTC P0133 & P0153 This code indicates that response rate is below calibration in HO2S as follows: DTC P0133 for right front (or front) HO2S. DTC P0153 for left front (or rear) HO2S. Possible causes are as follows: Open or shorted circuit. Exhaust leak. Excessive fueling. HO2S coated with contaminants. Faulty MAF sensor. Leak in air induction system. With scan tester connected, turn ignition on. Access Generic OBD-II functions and enter. Select to Diagnostic Monitoring and enter. Scroll to Manufacturer Specific Test ID and enter. Scroll to Test ID: (41H) and enter. If measurement fault is 0.5 volt or more, fault cannot be duplicated or identified at this time and testing is complete. If measurement fault is less than 0.5 volt, go to next step.
3. Step 22) Check For HO2S Contamination Check following possibilities as potential source of contamination: Use of unapproved silicon sealers. Use of unapproved cleaners. Fuel contaminated by silicon additives. Fuel contaminated by lead. Excessive oil burning. Antifreeze leaking internally. If any of these conditions are present, repair or replace as necessary. Replace HO2S. Change oil, filter and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If none of these conditions are present, go to next step.
4. Step 23) Check For Unmetered Air Leaks Vacuum or air leaks in non-EEC-V areas could cause fault code to set. Check the following as potential source of air leak: Leaking vacuum hoses. Leaking intake manifold gasket. EGR system. PCV system. Poorly seated oil dip stick and/or dipstick tube. If any of these conditions are present, repair or replace as necessary. Perform drive cycle and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If none of these conditions are present, go to next step.
5. Step 24) Check HO2S Circuits Turn ignition off. Disconnect PCM and suspect HO2S wiring harness connector. Inspect connectors for damage and repair as necessary. Connect jumper wire between HO2S SIG and VPWR at sensor wiring harness connector. With scan tester connected to DLC, turn ignition on. Access HO2S PID. If PID voltage is less than 1.5 volts, go to next step. If PID voltage is 1.5 volts or more, replace HO2S and change engine oil. Test drive vehicle and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 25) Check HO2S Signal Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect HO2S test pin at breakout box and HO2S terminal at wiring harness connector. Measure resistance between suspect SIG RTN test pin at breakout box and SIG RTN terminal at wiring harness connector. If either resistance is 5 ohms or more, repair open circuit. Drive vehicle at 55 MPH for 5 minutes and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If each resistance is less than 5 ohms, go to next step.
7. Step 26) Check HO2S For Short Circuit Ensure ignition is off and PCM is disconnected. Disconnect scan tester from DLC. Measure resistance between suspect HO2S test pin and test pins No. 71 and 97 (VPWR) at breakout box. Measure resistance between suspect HO2S test pin and test pin No. 91 (SIG RTN) at breakout box. If either resistance less than 10,000 ohms, repair short circuit. Drive vehicle for 5 miles at 55 MPH and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If each resistance is 10,000 ohms or more, replace PCM.
8. Step 27) DTC P0131 & P0151: Contaminated HO2S/Voltage Shift These DTCs are set when HO2S generates negative voltage. Possible causes are as follows: Crossed HO2S SIG / SIG RTN circuit. HO2S contaminated with water, fuel, etc. Check for moisture in HO2S connector and repair if necessary. If connector is okay, go to next step.
9. Step 28) Check HO2S For Short Circuit Ensure ignition is off. Disconnect suspect HO2S. Disconnect PCM 104-pin connector. Inspect connectors for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect sensor HO2S SIGNAL and SIG RTN terminal and test pins indicated as follows: DTC P0131, test pin No. 60. DTC P0151, test pin No. 87. If resistance is less than 5 ohms, replace HO2S and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, repair circuit and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 28) to step 30). No test procedures have been omitted.
10. Step 30) DTC P0135, P0141, P0155 Or P0161: Check HO2S Heater Signal Circuit DTCs P0135, P0141, P0155 and P0161 received separately indicate a short to ground or open in HO2S heater circuit. DTCs received in pairs, such as P0135 and P0155 or P0141 and P0161, indicate HO2S heater signal circuit shorted to a power source greater than 2.0 volts. DTCs received in pairs with one downstream heater code and one upstream heater code are treated as the following separate codes. DTC P0135 for right front HO2S. DTC P0155 for left front HO2S. DTC P0141 for right rear HO2S. DTC P0161 for left rear HO2S. Possible causes are as follows: Signal shorted in wiring harness or HO2S. Water in connectors. Cut or pulled wires. Open in PWR GND or VPWR circuit. Inspect HO2S connectors for damage or poor connection. Repair or replace connectors as necessary. If HO2S connectors are okay, go to next step.
11. Step 31) Perform «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) Start engine and operate at 2000 RPM for 5 minutes. Turn ignition off. Perform KOEO SELF-TEST. If DTC P0135, P0141, P0155 or P0161 are present, go to next step. If specified DTCs are not present, go to CIRCUIT TEST Z.
12. Step 32) Check For Voltage At HO2S Heater Wiring Harness Connector Turn ignition off. Disconnect suspect HO2S. Inspect wiring harness for damage and repair as necessary. Turn ignition on. Measure voltage between SIG RTN and VPWR terminal at HO2S wiring harness connector. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step 34).
13. Step 33) Turn ignition off. With suspect sensor disconnected, measure resistance between VPWR terminal at HO2S wiring harness connector and test pins No. 71 and 97 at breakout box. If resistance is less than 4 ohms, go to next step. If resistance is 4 ohms or more, check circuit fuse. If fuse is okay, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
14. Step 34) Turn ignition off. With suspect sensor disconnected, measure resistance between HO2S HEATER GND terminal and VPWR terminal at HO2S wiring harness connector. If resistance is 3-30 ohms, go to next step. If resistance is not 3-30 ohms, replace HO2S sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
15. Step 35) Leave ignition off and suspect sensor disconnected. Measure resistance between HO2S HEATER GND terminal at HO2S wiring harness connector and HO2S case. Measure resistance between HO2S HEATER GND terminal and SIG RTN terminal at HO2S wiring harness connector. Measure resistance between VPWR terminal at HO2S wiring harness connector and HO2S case. If each resistance measurement is more than 10,000 ohms, go to next step. If any resistance is 10,000 ohms or less, replace HO2S and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
16. Step 36) Check For Short Circuit Leave ignition off and sensor disconnected. Disconnect scan tester from DLC (if applicable). Disconnect PCM 104-pin connector. Inspect connector for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect sensor and test pins indicated as follows: DTC P0135 (RF), test pin No. 93 and test pins No. 24, 76, 91, Step 97 and 103. DTC P0141 (RR), test pin No. 95 and test pins No. 24, 76, 91, Step 97 and 103. DTC P0155 (LR), test pin No. 94 and test pins No. 24, 76, 91, Step 97 and 103. DTC P0161 (LR), test pin No. 96 and test pins No. 24, 76, 91, Step 97 and 103. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short in circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
17. Step 37) Leave ignition off and sensor disconnected. Measure resistance between HO2S HEATER GND terminal at HO2S wiring harness connector and appropriate test pin as follows: Right front (or front) HO2S sensor; test pin No. 93. Left front (or rear on 4.9L) HO2S sensor; test pin No. 94. Right rear (or rear) HO2S sensor; test pin No. 95. Left rear HO2S sensor; test pin No. 96. If resistance is 4 ohms or more, repair open circuit or excessive resistance in wiring harness and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 4 ohms, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 37) to step 40). No test procedures have been omitted.
18. Step 40) DTC P1130, P1150, P1131, P1151, P1132 Or P1152: HO2S Not Switching DTCs P1131 and P1151 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P1132 and P1152 indicate air/fuel ratio is correcting lean for an overly rich condition. DTCs P1130 and P1150 indicate fuel system has reached maximum compensation and HO2S is not switching at the adaptive limits. Possible causes are as follows: Fuel system malfunction. EGR system malfunction. Air intake or vacuum system leak. Engine oil level too high. Excessive internal engine wear. Inspect engine for obvious defects in specified systems. Repair or replace as necessary. If no faults are found, go to next step.
19. Step 41) DTC P0171, P0172, P0174 Or P0175: HO2S Not Switching DTCs P0171 and P0174 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P0172 and P0175 indicate air/fuel ratio is correcting lean for an overly rich condition. Possible causes are as follows: Fuel system malfunction. - Excessive fuel pressure. - Leaking fuel injector(s). - Leaking fuel pressure regulator. - Low fuel pressure. - Contaminated injector(s). EGR system malfunction. - Leaking gasket. - EGR valve stuck open. - Leaking diaphragm. Air intake or vacuum system leak. - Air leaks after the MAF. - Vacuum leaks. - Restricted air inlet. - PCV system. - Fuel purge system. - Improperly seated dip stick. Base engine. - Oil overfill. - Cam timing. - Cylinder compression. - Exhaust leaks before or near the HO2S's. Excessive internal engine wear. Inspect engine for obvious defects in specified systems. Repair or replace as necessary. If no faults are found, go to next step.
20. Step 42) Perform KOER SELF-TEST With ignition off, connect scan tester to DLC. Disconnect fuel vapor hose from intake manifold. Plug fitting at intake manifold. Start engine, and operate at 2000 RPM for one minute. Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) and proceed as follows: If DTCs P1127, P1128 or P1129 are present, go to appropriate CIRCUIT TEST. If DTCs P0131 or P0151 are present, go to step 27). If DTCs P0132 or P0152 are present, go to step 43). If none of these DTCs are present, proceed as follows: If diagnosing DTCs P1130, P1150, P1171, P1172, P1174 or P1175, go to step 43). If diagnosing DTCs P1132 or P1152, go to CIRCUIT TEST HW, step 10). If diagnosing any other DTCs, go to CIRCUIT TEST Z.
21. Step 43) Check Fuel Pressure Release fuel system pressure. With ignition off, install fuel pressure gauge. Ensure manifold vacuum is connected to fuel pressure regulator. Start engine and operate at 2500 RPM. If vehicle will not start, cycle key on and off. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification, go to next step. If fuel system pressure is not within specification, go to CIRCUIT TEST HC.
22. Step 44) Check System Ability To Hold Fuel Pressure With fuel pressure gauge installed, cycle ignition from OFF to ON position 3-4 times to pressurize fuel system ( DO NOT start engine). If fuel pressure does not remain at specification for 60 seconds, go to step 3) under CIRCUIT TEST HC. If fuel pressure remains within 5 psi of highest fuel pressure reading for 60 seconds, proceed as follows: For no-start vehicles, go to step 46). For DTCs P1130, P01150, P0171, P0172, P0174 and P0175, go to step 45). For fuel control DTCs displayed with misfire DTCs, go to step Step 47). For all other DTCs, go to step 51).
23. Step 45) Check Ability To Hold Fuel Pressure With fuel pressure gauge installed, cycle ignition from OFF to ON position 3-4 times to pressurize fuel system ( DO NOT start engine). Note fuel pressure. If fuel pressure remains within 5 psi of original pressure for at least 10 seconds, go to step 47). If fuel pressure drops more than 5 psi, go to step 47).
24. Step 46) Check Ability Of Injectors To Deliver Fuel With fuel pressure gauge installed, cycle ignition from OFF to ON position 3-4 times to pressurize fuel system ( DO NOT start engine). Note fuel pressure. Disconnect Inertia Fuel Switch (IFS). Crank engine for 5 seconds. If fuel pressure remains within 5 psi (34 kPa) of original pressure, go to next step. If fuel pressure drops more than 5 psi (34 kPa), repair fuel system as necessary.
25. Step 47) Check Fuel Injector & Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damage or corrosion and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure and record resistance between suspected fuel injector circuit test pin and test pin No. 71 and 97 at breakout box. Refer to «FUEL INJECTOR INJ CIRCUIT IDENTIFICATION»(ref-23594-S12983556812002011500000) table. Resistance should be 11-18 ohms. If resistance is not correct, go to next step. If resistance is correct, go to step 50). FUEL INJECTOR INJ CIRCUIT IDENTIFICATION Injector No. Test Pin No. Wire Color 1 75 Tan 2 101 White 3 74 Brown/Yellow 4 100 Brown/Blue 5 (1) 73 Tan/Black 6 (1) 99 Green/Orange 7 (1) 72 Tan/Red 8 (1) 98 Light Blue (1) If equipped.
26. Step 48) Check Continuity Of Fuel Injector Circuit Turn ignition off. Disconnect suspect fuel injector wiring harness connector. Measure resistance between test pins No. 71 and 97 at breakout box and fuel injector VPWR terminal at wiring harness connector. Measure resistance between fuel injector signal test pin(s) at breakout box and same fuel injector circuit terminal at each fuel injector wiring harness connector. If each resistance is less than 5 ohms, go to next step. If each resistance is 5 ohms or more, repair open circuit. Reconnect all components and drive vehicle for 5 miles at 55 MPH. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
27. Step 49) Check Fuel Injector Circuit For Short To Power Or Ground Turn ignition off. Disconnect suspect fuel injector wiring harness connector. Measure resistance between fuel injector test pin and test pins No. 24, 71, 76, 97 and 103 at breakout box. Also, measure resistance between fuel injector test pin(s) at breakout box and chassis ground. If each resistance is 10,000 ohms or more, go to next step. If any resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
28. Step 50) Check Fuel Injector Drive Signal With ignition off, connect PCM to breakout box. Connect non-powered 12-volt test light between suspect fuel injector and test pins No. 71 and 97. Crank or start engine. If test light glows dimly, go to next step. If test light does not glow dimly (no light/bright light), replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
29. Step 51) Check Fuel Injector Flow & Leakage Turn ignition off. Remove breakout box. Reconnect PCM. Use Rotunda Injector Tester (113-00001) to flow test fuel injectors. If fuel injector flow or leakage rate is not okay, replace fuel injector, and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If flow rate for each fuel injector is okay, proceed as follows: For DTCs P1171, P1172, P1174 and P1175, go to CIRCUIT TEST Z. For DTCs P1131 and P1151, go to next step. For DTCs P1132 and P1152, go to step 53). For DTCs P1130 and P1150, go to step 57).
30. Step 52) Check Secondary Air Injection If vehicle is not equipped with secondary air injection, go to next step. Turn ignition off. Disconnect secondary air injection hoses. Plug air injection ports. With engine at operating temperature, perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTC P1131 or P01151 are present, go to next step. If specified DTCs are not present, go to step 7) under CIRCUIT TEST HM.
31. Step 53) Check Cylinder Compression Using compression gauge, check cylinder compression. If cylinder compression is not okay, repair engine as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If compression is okay, go to next step (DTCs P1130, P1150, P1131 and P1151) or step 59) (DTCs P1132 and P1152). If misfire DTCs are displayed with fuel control DTCs, go to step 20).
32. Step 54) Check HO2S Integrity DTCs P0130, P0150, P0131, and P0151 indicate HO2S switches slow or doesn't switch, is always lean or fuel is at adaptive limit. Possible causes are as follows: Moisture inside HO2S causing short to ground. HO2S coated with contaminates. HO2S circuit open or shorted to ground. Turn ignition off. Inspect HO2S and circuit for damage or contamination. Repair or replace HO2S or wiring as necessary. Start engine and operate at 2000 RPM for 2 minutes. Turn ignition off. Connect scan tool to DLC and perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTCs P1131 or P1151 are present, go to next step. If specified DTCs are not present, faults cannot be duplicated or identified at this time. Testing is complete.
33. Step 55) Check HO2S Ability To Generate Correct Voltage Turn ignition off. Disconnect suspect HO2S wiring harness connector. Using DVOM, measure voltage between HO2S SIG terminal and SIG RTN terminal of HO2S wiring harness connector. Start engine and operate at 2000 RPM for 2 minutes. Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) while monitoring voltage. If voltage is 0.5 volt or more at the end of test, go to next step. If voltage is less than 0.5 volt, replace HO2S sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
34. Step 56) Check Continuity Of HO2S Ground Circuits Turn ignition off. Install breakout box, leaving PCM disconnected. Disconnect suspect HO2S wiring harness connector. Inspect connector for damage and repair as necessary. Measure resistance between HO2S test pin at breakout box and HO2S terminal at sensor wiring harness connector. Also, measure resistance between test pin No. 91 and SIG RTN terminal at HO2S sensor vehicle wiring harness connector. If each resistance is less than 5 ohms, go to next step. If any resistance 5 ohms or more, repair open circuit, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
35. Step 57) Check HO2S Circuit For Short To Ground Turn ignition off. Leave breakout box installed and PCM disconnected. Disconnect HO2S. Measure resistance between HO2S SIG circuit test pin and test pins No. 24, 51 76, 77 and 103 at breakout box. If all readings are 10,000 ohms or more, go to next step. If any reading is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
36. Step 58) Check HO2S For Short To Ground Ensure ignition is off and PCM is disconnected. Connect HO2S to wiring harness connector. Measure resistance between HO2S SIG RTN test pin and test pin 91 at breakout box. If resistance measurement is less than 10,000 ohms, replace HO2S and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or more, perform following procedure as applicable: For DTCs P1130 and P1150, go to next step. For Continuous Memory DTCs P1131 and P1151, go to step 64). For KOER codes P1131 and P1151, replace PCM.
37. Step 59) Perform KOER SELF-TEST Start engine, and warm it to normal operating temperature. With scan tester connected, perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTCs P1132 and P1152 are present, go to next step. If codes are not present, fault is intermittent. Go to CIRCUIT TEST Z.
38. Step 60) Check For HO2S Short To Power DTCs P1130, P1150 and/or P1132, P1152 indicate HO2S is always rich. Possible causes are as follows: Moisture inside HO2S wiring harness connector. HO2S circuit shorted to power. Turn ignition off. With scan tool connected, access PID for code generated. If 1.0-4.0 volts are present, go to next step. If 1.0-4.0 volts are not present, go to step 63).
39. Step 61) Check For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair wiring as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Leave suspect HO2S disconnected. Measure resistance between HO2S terminal of wiring harness connector and following test pins at breakout box: DTC P01130 and P01132; test pin No. 60 and test pins No. 71, Step 93 and 97. DTC P01150 and P01152; test pin No. 87 and test pins No. 71, Step 93 and 97. If each resistance is more than 10,000 ohms, go to next step. If any resistance is 10,000 ohms or less, repair short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
40. Step 62) Leave ignition off and HO2S disconnected. Remove breakout box and reconnect PCM. Using scan tool, access HO2S PID of suspect sensor. If HO2S voltage is less than 0.2 volt, replace HO2S sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If HO2S voltage is 0.2 volts or more, replace PCM and repeat QUICK TEST.
41. Step 63) Attempt To Generate DTC P1131 or P1151 Leave ignition off and HO2S disconnected. Using a jumper wire, connect HO2S terminal of wiring harness connector to negative battery terminal. Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTC P1131 or P1151 is present, remove jumper wire and go to next step. If DTC P1131 or P1151 is not present, check PCM connector and service if necessary. If connector is okay, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
42. Step 64) HO2S Check Leave HO2S disconnected. Connect DVOM between HO2S SIG terminal and SIG RTN terminal of HO2S wiring harness connector. Disconnect any vacuum hose from vacuum tree. Start engine and operate at 2000 RPM. If DVOM reads less than 0.4 volt within 30 seconds, go to step 70). If DVOM does not read as specified, replace HO2S and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 64) to step 70). No test procedures have been omitted.
43. Step 70) Monitor HO2S PID Connect scan tester to DLC. Start engine and allow to idle. Using scan tester, access HO2S PID. Observe HO2S PID while shaking and bending wiring harness between HO2S and PCM. If HO2S voltage stays at 0.45 volt, go to next step. If HO2S voltage is more than 0.45 volt or less than 0.45 volt, isolate fault and repair as necessary.
44. Step 71) Monitor HO2S PID During Test Drive Leave scan tester connected to DLC. Using an assistant, test drive vehicle under various conditions while observing HO2S PID. If HO2S voltage switches from about 0.4 to 0.6 volt, system is okay and testing is complete. If voltage does not switch, replace HO2S and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 71) to step 80). No test procedures have been omitted.
45. Step 80) DTC P0136, P1137, P1138, P0156, P1157 & P1158 DTCs P0136 and P0156 indicate that output voltage of downstream HO2S is not within a functional window. KOER DTCs P1137, P1138, P1157 and P0158 indicate fuel control malfunction monitored as voltage change downstream HO2S. Possible causes are as follows: Damaged wiring harness or connector. Exhaust system leaks. Contaminated or defective HO2S. Inspect for faults. Repair or replace as necessary. If no faults are found, go to next step.
46. Step 81) Perform KOER SELF-TEST Start engine, and operate at 2000 RPM for 2 minutes. With scan tester connected, perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTCs P1137 P1138, P1157 and P1152 are present, go to next step. If specified DTCs are not present, fault is intermittent. Go to CIRCUIT TEST Z.
47. Step 82) Check Exhaust System Leaks in exhaust system can cause DTCs P0136 and P0156. Possible causes are as follows: Incorrect HO2S torque. Exhaust system leaks. Inspect entire exhaust system including catalyst and HO2S. Repair/replace as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If not faults are present, go to next step.
48. Step 83) Check HO2S Circuit For Short Circuit Leave ignition off and suspect HO2S disconnected. Disconnect scan tester from DLC. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair circuit as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between HO2S test pin and test pins No. 24, 76, 103 (PWR GND), 71, 97 (VPWR), 90 (VREF) and 91 (SIG RTN) at breakout box. Measure resistance between HO2S test pin and VPWR test pin at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit in wiring harness. Clear PCM memory. Drive vehicle for 5 miles and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
49. Step 84) Check Ground Circuit Continuity Leave ignition off and suspect HO2S disconnected. Measure resistance between HO2S SIG test pin at breakout box and HO2S SIG terminal at wiring harness connector. Measure resistance between SIG RTN test pin at breakout box and SIG RTN terminal at wiring harness connector. If resistance is 5 ohms or more, repair open circuit in wiring harness and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 5 ohms, go to next step.
50. Step 85) Check HO2S Circuit Continuity Turn ignition off. Connect scan tester to DLC. Ensure suspect HO2S and PCM are connected. Turn ignition on. Access HO2S PID of suspect sensor. If voltage reading is 1.5 or more, go to step 88). If voltage is less than 1.5 volts, go to next step.
51. Step 86) Check PCM Ground Circuit Continuity Turn ignition off. Connect PCM to breakout box. Disconnect vehicle wiring harness from breakout box. Measure resistance between test pin No. 91 and test pins No. 24, 76 and 103 at breakout box. If resistance is less than 5 ohms, remove breakout box. Reconnect PCM and go to next step. If resistance is 5 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
52. Step 87) Check HO2S PID Leave ignition off and HO2S disconnected. Using jumper wire, connect HO2S SIG terminal to VPWR terminal at suspect sensor wiring harness connector. Turn ignition on. Using scan tool, access HO2S PID of suspect sensor. If HO2S PID voltage is more than 1.5 volts, replace HO2S sensor. Complete drive cycle and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If HO2S voltage is 1.5 volts or less, replace PCM. Complete drive cycle and repeat QUICK TEST.
53. Step 88) Check PCM Voltage Leave suspect HO2S disconnected. Turn ignition on. Measure voltage between SIG RTN terminal at HO2S wiring harness connector and negative battery terminal. Measure voltage between HO2S SIG terminal at wiring harness connector and negative battery terminal. If voltage is 1.5 volts or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is less than 1.5 volts, replace HO2S and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 88) to step 100). No test procedures have been omitted.
54. Step 100) KOER DTC P1127 DTC P1127 indicates that HO2S heater was not on during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) and testing of HO2S did not occur. Possible cause is cool exhaust system. Connect scan tester to DLC. Using scan tester, access all HO2S HEATER. If all PIDs indicate ON, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If any PIDs are off, operate engine until all PIDs are on; repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 100) to step 110). No test procedures have been omitted.
55. Step 110) Check For Crossed HO2S Circuit Turn ignition off. Disconnect suspect HO2S. Inspect connector for indication of crossed wires or incorrect installation. Repair or replace if necessary and repeat «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If no faults are found, go to next step.
56. Step 111) Leave ignition off and suspect HO2S disconnected. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair circuit as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect circuit terminal at wiring harness connector and corresponding test pin at breakout box. If resistance is less than 5 ohms, fault is intermittent and cannot be duplicated at this time. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) to verify DTC is present. If resistance is 5 ohms or more, repair circuit. Clear PCM memory. Drive vehicle for 5 miles and repeat QUICK TEST.

Perform this test when directed by QUICK TEST or if directed by other test procedures. This test is used to diagnose

1. Fuel pressure.
2. Fuel filter.
3. Fuel return.
4. Fuel supply.
5. Fuel injector.
6. Engine vacuum systems.
7. Chassis components.

CIRCUIT TEST ACRONYMS

1. Step 1) Check System Integrity Turn ignition off. Inspect fuel system for leaks, damage or kinked hoses. Inspect wiring harness for damage or loose connectors. Ensure battery is fully charged and fuses are okay. If vehicle does not start, ensure vehicle has fuel in tank and inertia switch is set correctly. Repair or replace as necessary. If no faults are found, go to next step.
2. Step 2) Check Fuel Pressure Release fuel system pressure. Turn ignition off. Install fuel pressure gauge. Connect scan tester to DLC. Turn ignition on. Access scan tester Output Test Mode. Operate fuel pump at maximum fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step 9).
3. Step 3) Check System Ability To Hold Fuel Pressure With fuel pressure gauge installed, turn ignition off. Exit Output Test Mode. If fuel pressure remains within 5 psi of specification for 60 seconds, go to step 5). If fuel pressure does not remain within 5 psi of specification for 60 seconds, go to next step.
4. Step 4) Check Pressure Regulator Diaphragm With fuel pressure gauge installed, start engine and operate for 10 seconds. Turn ignition off and wait 10 seconds. Start engine again and operate for 10 seconds. Turn ignition off. Disconnect and inspect hose from fuel pressure regulator. If hose is wet with fuel, replace fuel pressure regulator. If hose is dry, go to step 11).
5. Step 5) Check Fuel Pressure; Test Drive Vehicle With fuel pressure gauge installed, disconnect and plug fuel pressure regulator hose. Ensure fuel pressure gauge can be seen by vehicle operator. Drive vehicle while noting gauge reading during heavy acceleration. If gauge reading stays within 3 psi of original pressure reading, go to next step. If gauge reading does not stay within 3 psi of original pressure reading, go to step 8).
6. Step 6) Check Fuel Pressure Regulator; Test Drive Vehicle With fuel pressure gauge installed, reconnect fuel pressure regulator hose. Install vacuum gauge to intake manifold. Ensure both gauges can be seen by vehicle operator. Drive vehicle while noting gauges during heavy acceleration. Gauge readings should be as follows: Fuel pressure gauge reading increases and vacuum gauge reading decreases. Fuel pressure gauge reading decreases and vacuum gauge reading increases. If gauge readings are correct, fuel system is okay and testing is complete. If gauge readings are not correct, go to next step.
7. Step 7) Check Vacuum Supply Turn ignition off. Disconnect and plug fuel pressure regulator hose. Install vacuum pump to fuel pressure regulator. Start engine and operate at idle. Observe fuel pressure gauge while applying vacuum to regulator. If fuel pressure changes as vacuum changes, system is okay and testing is complete. If fuel pressure does not change as vacuum changes, replace fuel pressure regulator.
8. Step 8) Check Fuel Filter Turn ignition off. Connect scan tester to DLC. Replace fuel filter. Turn ignition on. Enter Output Test Mode (OTM) and operate fuel pump. Compare fuel pressure gauge readings. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If gauge readings are within specification, system is okay. Return to step 3). If gauge readings are not within specification, go to step 12).
9. Step 9) Check Fuel Pressure Regulator Leave ignition off and scan tester connected to DLC. Release fuel system pressure. Disconnect fuel hose at fuel rail. Connect hose to fuel rail and put opposite end of hose in clean, one quart container. Turn ignition on. Enter Output Test Mode (OTM) to turn fuel pump on. Note fuel pressure and fuel returning to container. Exit OTM to turn fuel pump off. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification with fuel returning to container, go to next step. If fuel pressure is not within specification with fuel returning to container, replace fuel pressure regulator. If fuel pressure is zero, go to step 12).
10. Step 10) Check Fuel Return System Turn ignition off. Release fuel system pressure. Disconnect fuel hose at fuel pressure regulator. Check fuel return system for kinked or restricted hoses. Disconnect fuel return hose near fuel tank. Apply 3-5 psi to fuel hose from pressure regulator side. If air flows freely, replace fuel pump. If air does not flow freely, repair or replace hose as necessary.
11. Step 11) Check Fuel Injector Flow & Leakage Turn ignition off. Use Rotunda Injector Tester (113-00001) to flow test fuel injectors. If flow rate for each fuel injector is within specification, system is okay and testing is complete. If flow rate for any fuel injector is not within specification, replace defective fuel injector and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
12. Step 12) Check Fuel Pump Voltage Turn ignition off. Ensure scan tester is connected to DLC. Disconnect fuel pump wiring harness connector. Check connector terminals for damage and repair as necessary. Using scan tester, enter Output Test Mode (OTM) and activate fuel pump circuit. Check voltage at fuel pump connector, fuel pump relay and VCRM. If voltage is 10.5 volts or more, check fuel pump ground connection. Repair as necessary. If ground connector is okay, replace fuel pump. If voltage is less than 10.5 volts, isolate source of low voltage and repair as necessary.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Only use this test to diagnose

1. Ignition system.
2. Fuel pressure.
3. Fuel injectors.
4. Engine vacuum system.
5. Evaporative system.
6. Canister purge solenoid.
7. Internal engine wear.

Identifying CKP Sensor & Crankshaft Wheel. Scheme 34

MISFIRE TROUBLE CODES

1. Step 1) Check Possible Cause Of Misfire If vehicle runs out of fuel, a trouble code may be stored in PCM memory. If vehicle has recently run out of fuel, clear PCM memory. If vehicle has not recently run out of fuel, go to next step.
2. Step 2) Check For Continuous DTCs If continuous codes are present, service as necessary. Disregard misfire codes at this time. If no other misfire codes are present, go to next step.
3. Step 3) Check For KOEO DTCs If any KOEO DTCs are present, service as necessary. Disregard misfire codes at this time. If no KOEO DTCs are present, check spark plugs and spark plug wires. If spark plugs and spark plug wires are okay, go to next step.
4. Step 4) Check For KOER DTCs If any KOER DTCs except P1131 or P1151 are present, service as necessary. Disregard misfire codes at this time. If KOER DTCs P1131 or P1151 are present, go to step 8). If no KOER DTCs are present, check spark plugs and spark plug wires. If spark plugs and spark plug wires are okay, go to next step.
5. Step 5) Check/Compare PID Values Turn ignition and all accessories off. Connect scan tester to DLC. Ensure engine is warmed to operating temperature. Turn ignition on. Using scan tester, access and record DPFEGR PID. Start engine and allow to idle. Record DPFEGR PID. If both DPFEGR PID voltage values are within 0.15 volts of each other, go to step 8). If DPFEGR PID voltage is not as specified, go to CIRCUIT TEST HE, step 100). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 8). No test procedures have been omitted.
6. Step 8) Check Fuel Injector & Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Measure and record resistance between suspected fuel injector test pin and test pin No. 71 and 97 at breakout box. If resistance is 11-18 ohms, go to step 9). If resistance is not 11-18 ohms, go to step 47) under CIRCUIT TEST H.
7. Step 9) Check Fuel Injector Drive Signal With ignition off, connect PCM to breakout box. Connect a non-powered 12-volt test light between test pin No. 71 or 97 and suspect fuel injector test pin at breakout box. Crank or start engine. If test light glows dimly, system is operating correctly. Clean fuel injectors and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not glow dimly (no light/bright light), replace PCM and repeat QUICK TEST.
8. Step 10) Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step 2) under CIRCUIT TEST HC.
9. Step 11) Check System Ability To Hold Fuel Pressure Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. Check for fuel leaking from around fuel injectors, fuel pressure regulator and fuel hoses. Repair if necessary. Turn ignition off. Turn ignition on and note fuel pressure gauge reading. If fuel pressure remains at specification for one minute, go to next step. If fuel pressure does not remain at specification for one minute, go to step 3) under CIRCUIT TEST HC.
10. Step 12) Check Fuel Injector Flow & Leakage Turn ignition off. Use Rotunda Injector Tester (113-00001) to flow test fuel injectors. If flow rate for each fuel injector is okay, go to step 20). If flow rate for any fuel injector is not okay, replace defective fuel injector and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
11. Step 20) Check Vacuum System Inspect all vacuum hoses for kinks or damage. Ensure all vacuum connections are clean and tight. Repair or replace as necessary. If vacuum system is okay, go to next step. NOTE: The misfire monitor can be affected by the evaporative emission system.
12. Step 21) Check Evaporative Emission System Inspect carbon canister. Replace carbon canister if it contains liquid fuel. If carbon canister is okay, go to next step.
13. Step 22) Pressure Test Evaporative System Remove vapor line from canister and install vacuum tee. Connect a pressure gauge to one side of tee and low pressure air pump to other side of tee. Apply 0.75 psi (5.2 kPa). If evaporative emission system holds pressure, reconnect vapor line and go to next step. If system does not hold pressure, isolate fault and repair as necessary.
14. Step 23) Check Vacuum In Evaporative System Inspect vacuum hoses between engine and carbon canister for restrictions or damage. Ensure all vacuum connections are clean and tight. Repair or replace as necessary. If system is okay, go to next step for vehicles with EVAP canister purge solenoid, or step 26) for vehicles equipped with Vapor Management Valve (VMV).
15. Step 24) Check Canister Purge Solenoid (CANP) Turn ignition off. Disconnect CANP solenoid wiring harness connector. Inspect connector for damaged pins and repair as necessary. Using jumper wire, apply 12 volts to VPWR (Red wire) terminal of CANP wiring harness connector. Connect CANP (Gray/Yellow wire) terminal to ground. Connect vacuum pump to manifold side of CANP solenoid and apply 16 in. Hg. When 12 volts is applied, solenoid should open and pass air freely. Replace solenoid if it does not function correctly. If solenoid does function correctly, go to next step.
16. Step 25) Check Engine Condition Inspect engine for obvious faults. Ensure compression is even and within specification. Check PCV system for restrictions or leaks. Repair or replace as necessary. If no faults can be found, misfire trouble code is intermittent. Go to CIRCUIT TEST Z.
17. Step 26) Check Vapor Management Valve (VMV) Housing Turn ignition off. Ensure vehicle is at room temperature. Connect vacuum pump to fuel vapor port of VMV and apply 16 in. Hg. If vacuum is held, go to next step. If vacuum is not held, replace VMV and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
18. Step 27) Leave ignition off. Disconnect hose from vacuum input port of VMV. Connect vacuum pump to VMV vacuum input port and apply 10-15 in. Hg. If little or no vacuum is lost, service VMV filter. If filter is okay, replace VMV. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If vacuum is not as specified, go to step 25).

Perform this test when instructed by QUICK TEST . This test is only intended to diagnose

1. Differential Pressure Feedback Electronic (DPFE) sensor.
2. DPFE sensor hoses.
3. Electronic Vacuum Regulator (EVR).
4. Orifice tube assembly.
5. Faulty EGR valve.
6. Wiring harness circuits (DPFE SIG, EVR, EVR PWR, SIG RTN and VREF).
7. Faulty Powertrain Control Module (PCM).

DPFE Sensor Wiring Harness Connector Terminals. Scheme 35

EVR Solenoid Wiring Harness Connector Terminals. Scheme 36

DPFE System Components. Scheme 37

Scheme 38

1. Step 1) DTC P1400: Check DPFE Voltage This code indicates open in DPFE SIG circuit. Possible causes for this fault are: Leaking upstream pressure hose. DPFE SIG shorted to GND or SIG RTN circuit. VREF shorted to GND or SIG RTN circuit. Faulty DPFE sensor. Faulty PCM. Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using scan tester, access DPFEGR PID. If voltage is less than 0.2 volt, go to next step. If voltage is 0.2 volt or more, go to step 6).
2. Step 2) Generate Opposite DPFE Signal Turn ignition off. Disconnect DPFE wiring harness connector. Using a jumper wire, connect DPFE SIG and VREF terminals at wiring harness connector. Turn ignition on. Using scan tester, access DPFE SIG PID. If scan tester error occurs, disconnect jumper wire and go to step 3). If DPFEGR PID value is not 4-6 volts, go to step 3). If DPFEGR PID value is 4-6 volts, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
3. Step 3) Measure VREF Voltage At DPFE Sensor Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to step 4). If voltage is not 4-6 volts, go to CIRCUIT TEST C.
4. Step 4) Check DPFE SIG For Short To Ground Leave DPFE sensor disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 91 (SIG RTN) and test pins No. 51 and 103 (PWR GND). If each measurement is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.
5. Step 6) Wiggle Test Sensor & Harness With ignition off, connect scan tester to DLC. Turn ignition on. Access DPFE PID with scan tester. Observe DPFE PID for indication of fault while shaking and bending DPFE sensor wiring harness and connector. Tap lightly on DPFE sensor to simulate road shock. An indication of fault is a sudden change in DPFE PID voltage. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.
6. Step 10) DTC P1401: Check DPFE Signal Voltage This code indicates PCM has detected DPFE SIG circuit input above maximum. Possible causes for this fault are: Open circuit in DPFE SIG or SIG RTN circuit. DPFE SIG shorted to VREF or PWR circuit. VREF shorted to PWR circuit. Faulty DPFE sensor. Faulty PCM. With ignition off, connect scan tester to DLC. Turn ignition on. Access DPFEGR PID. If voltage is more than 4.0 volts, go to next step. If voltage is 4.0 volts or less, go to step 19).
7. Step 11) Check DPFE SIG For Short To Power Turn ignition off. Disconnect DPFE wiring harness connector. Turn ignition on. Measure voltage between DPFE SIG terminal at wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 13).
8. Step 12) Leave ignition off and DPFE sensor disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 65 (DPFE SIG) and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is 10.5 volts or more, repair short between DPFE SIF and PWR circuit. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST.
9. Step 13) Generate Opposite DPFE Signal Turn ignition off. Disconnect DPFE wiring harness connector. Using a jumper wire, connect DPFE SIG and SIG RTN terminals at wiring harness connector. Turn ignition on. Using scan tester, access DPFEGR SIG PID. If scan tester error occurs, disconnect jumper wire and go to step 18). If DPFEGR PID value is.05 volt or more, go to step 16). If DPFEGR PID value is less than.05 volt, disconnect jumper wire and go to next step.
10. Step 14) Verify VREF Is Within Range Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
11. Step 15) Check DPFE SIG For Short To VREF Leave DPFE sensor disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 90 (VREF) at breakout box. If resistance is 10,000 ohms or more, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.
12. Step 16) Check DPFE SIG For Open Circuit Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and DPFE SIG terminal at DPFE sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
13. Step 17) Check SIG RTN For Open Circuit Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal of DPFE sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat QUICK TEST.
14. Step 18) Check DPFE SIG For Short To VREF Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 90 (VREF) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, repair short between DPFE SIG and VREF circuit. Repeat QUICK TEST.
15. Step 19) Wiggle Test Sensor & Harness With ignition off, connect scan tester to DLC. Turn ignition on. Access DPFE PID with scan tester. Observe DPFE PID for indication of fault while shaking and bending DPFE sensor wiring harness and connector. An indication of fault is a sudden change in DPFE PID voltage. Tap lightly on DPFE sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.
16. Step 20) DTC P0402: Check EGR Flow At Idle This code indicates PCM has detected EGR flow at idle. Possible causes for this fault are: EGR valve stuck open. EVR solenoid vent plugged. EVR circuit shorted to ground. Excessively worn or damaged vacuum hose. Faulty EVR solenoid. Faulty PCM. NOTE: If Continuous Memory Code P1405 is present, go to step 50). With ignition off, disconnect and plug EGR vacuum hose. Perform KOER self-test. If DTC P0402 is present, service or replace EGR valve. If DTC P0402 is not present or vehicle will not start/run, go to next step.
17. Step 21) Turn ignition off. Reconnect EGR vacuum hose. Perform KOER self-test. If DTC P0402 is present, go to next step. If DTC P0402 is not present or vehicle will not start/run, go to step 30).
18. Step 22) Check EGR System Using vehicle's vacuum diagram label, check EGR system vacuum hoses for damage, tight connections and correct routing. If hoses are okay, go to next step. If hoses are not okay, repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
19. Step 23) Check DPFE Sensor Output Turn ignition off. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor downstream port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than one volt. If PID voltage is not as specified, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If PID voltage is as specified, go to next step.
20. Step 24) Check EGR Flow At Idle With EVR Solenoid Disconnected Turn ignition off. Disconnect EGR valve vacuum hose. Connect vacuum gauge to hose. Start engine and allow to idle. While observing vacuum gauge, disconnect EVR solenoid. If vacuum gauge reads 1.6 in. Hg or more, go to next step. If vacuum gauge reads less than 1.6 in. Hg, go to step 26).
21. Step 25) Check EVR Vent Turn ignition off. Disconnect EVR solenoid vent cap and vacuum hoses. Remove EVR filter and inspect for restriction. Using a vacuum pump, apply 15 in. Hg to EVR vent. If EVR solenoid is plugged or restricted, repair or replace as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If solenoid is not plugged or restricted, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.
22. Step 26) Check EVR Solenoid Coil Resistance Turn ignition off. Disconnect EVR solenoid wiring harness connector. Measure resistance between EVR terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
23. Step 27) Check EVR Circuit For Short To Ground Leave ignition off and EVR solenoid disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 47 (EVR) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short between EVR circuit and ground.
24. Step 28) Check EVR Circuit For Short To VREF Leave ignition off and EVR solenoid disconnected. Measure resistance between test pin No. 47 (EVR) and test pins No. 90 (VREF) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, repair short between EVR circuit and VREF circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 28) to step 30). No test procedures have been omitted.
25. Step 30) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, go to next step. If voltage readings are not as specified, replace DPFE sensor. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
26. Step 31) Check DPFE SIG Voltage Leave ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Connect vacuum hose to EGR valve and plug hose. Start engine and allow to idle. Observe DPFEGR PID voltage at idle and compare to KOEO voltage. If voltage is higher at idle, apply 2-3 in. Hg to EGR valve and release vacuum. Repeat several times while observing DPFEGR PID voltage on scan tool. DPFEGR PID voltage should increase as valve begins to open and return to initial value as vacuum is released. A slow to return voltage is an indication of a slow closing EGR valve. If DPFEGR PID does not indicate fault, go to next step. If fault is indicated by DPFE PID, service or replace EGR VALVE. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
27. Step 32) Check EGR Valve Vacuum While Wiggling EVR Circuit Turn ignition off. Disconnect vacuum hose at EGR valve and connect to vacuum gauge. Turn ignition on. Observe vacuum gauge for indication of fault while wiggling EVR wiring harness and connector. Fault is indicated by a sudden jump in vacuum reading. Tap lightly on sensor to simulate road shock. If no faults are indicated, go to next step. If fault is indicated, isolate and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
28. Step 33) Check EVR Solenoid For Restriction Turn ignition off. Disconnect EVR solenoid vent filter. Inspect for contamination or water. Remove EGR vacuum hose and inspect for restriction. Repair or replace as necessary. If no faults can be found, problem is intermittent and cannot be identified at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 33) to step 40). No test procedures have been omitted.
29. Step 40) DTC P1403: Check For Reversed Pressure Hoses Check hoses for proper connection. DPFE port marked HI should connect to exhaust side of orifice tube. DPFE port marked REF should connect to intake side of orifice tube. (Scheme 36) If hoses are not routed correctly, repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hoses are routed correctly, problem cannot be identified at this time. Clear PCM memory and repeat QUICK TEST. (Scheme 38): Identifying DPFE Vacuum Circuit NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 40) to step 50). No test procedures have been omitted.
30. Step 50) DTC P1405: Check For Upstream Pressure Hose Connection Check upstream hose for clean, tight connection. (Scheme 36) Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hose is okay, go to next step.
31. Step 51) Inspect Upstream Pressure Hose Check upstream hose for clean, tight connection. Ensure hose is not pinched, wet or contaminated. Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hose is okay, go to next step.
32. Step 52) Inspect Orifice Tube Assembly & DPFE Sensor Check DPFE sensor port for restriction or damage. Inspect exhaust manifold side pressure pick-up tube at the orifice tube assembly for restriction or damage. Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If no faults are found, clear PCM memory and repeat QUICK TEST. If hose is okay, go to next step.
33. Step 53) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltages not as specified, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage readings are as specified, fault is intermittent and cannot be duplicated at this time. Clear PCM memory and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 60). No test procedures have been omitted.
34. Step 60) DTC P1406: Check For Downstream Pressure Hose Connection Check downstream hose for clean, tight connection. (Scheme 36) Repair as necessary. Clear PCM memory and repeat procedures under «QUICK TEST»(ref-23594-S34023665322001010300000). If hose is okay, go to next step.
35. Step 61) Inspect Downstream Pressure Hose Check downstream hose for clean, tight connection. Ensure hose is original equipment. Ensure hose is not pinched, wet or contaminated. Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hose is okay, go to next step.
36. Step 62) Inspect Orifice Tube Assembly & DPFE Sensor Check DPFE sensor port for restriction or damage. Inspect intake manifold side pressure pick-up tube at the orifice tube assembly for restriction or damage. Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If no faults are found, go to next step.
37. Step 63) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltages not as specified, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage readings are as specified, fault is intermittent and cannot be duplicated at this time. Clear PCM memory and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 63) to step 70). No test procedures have been omitted.
38. Step 70) DTC P0401 These codes indicate self-test has detected no EGR flow. Possible causes are as follows: EGR valve stuck closed. EGR valve diaphragm leak. EGR flow plugged or restricted. Faulty EGR hose. EVR VPWR circuit open. EVR VPWR circuit to PCM open or shorted to PWR. DPFE sensor VPWR circuit open. DPFE sensor hoses faulty. Faulty DPFE sensor. Faulty EVR solenoid. Faulty PCM. If fault is currently present, KOER code P1408 should be present. Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000). If DTC P1408 is present, go to next step. If DTC P1408 is not present, go to step 90).
39. Step 71) DTC P1408 This code indicates «KOER SELF-TEST»(ref-23594-S04533554802001010300000) has detected EGR flow out of range. Possible causes are as follows: EGR valve stuck closed. EGR valve diaphragm leak. EGR flow plugged or restricted. Faulty EGR hose. EVR VPWR circuit open. EVR VPWR circuit to PCM open or shorted to PWR. DPFE sensor VPWR circuit open. DPFE sensor hoses faulty or reversed. Downstream pressure hoses plugged or removed. Faulty orifice tube assembly. Faulty DPFE sensor. Faulty EVR solenoid. Faulty PCM. Retrieve Continuous Memory DTCs. If any codes except DTCs P1403 or P1406 are present, service as necessary before continuing. If DTC 1406 is present, go to step 60). If no codes are present, go to next step.
40. Step 72) Perform KOER SELF-TEST While Monitoring EGR Vacuum Disconnect vacuum hose from EGR valve. Connect hose to vacuum gauge. Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) while monitoring gauge. Disregard DTCs set during this test. During test, if EGR vacuum should rise to 3.0 in. Hg or more, go to next step. If vacuum stays below 3.0 in. Hg, go to step 80).
41. Step 73) Inspect DPFE Pressure Hoses Check both hoses for correct routing. Ensure hoses are not restricted or plugged or leaking. Inspect DPFE sensor and orifice tube assembly for restriction or damage at pick-up tube. If no faults are found, go to next step. If faults are found, repair or replace as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
42. Step 74) Check VREF Voltage At DPFE Sensor Turn ignition off. Disconnect DPFE sensor wiring harness connector. Turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at DPFE sensor wiring harness connector. If voltage is 4-6 volts, reconnect DPFE sensor and go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
43. Step 75) Vacuum Check DPFE Sensor Output Turn ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 8-9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are not as specified, replace DPFE sensor. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltages are as specified, go to next step.
44. Step 76) Check EGR Valve Function Turn ignition off. Leave scan tester connected to DLC. Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tester, access DPFEGR and RPM PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 10 seconds. It may be necessary to increase engine speed to maintain 800 RPM. EGR valve should start to open at about 1.6 in. Hg. of vacuum, indicated by increasing DPFEGR PID voltage. DPFEGR PID voltage should increase to 2.5 volts (EGR fully open). DPFGER PID voltage should hold steady when vacuum is held. If voltage drops within a few seconds, EGR valve or vacuum source may be leaking. If DPFEGR PID voltage is as specified, reconnect all components and go to step 85). If DPFEGR PID voltage is not as specified, check the following and repair as necessary: Remove and inspect EGR for signs of contamination, unusual wear, carbon deposits, binding, leaking diaphragm and other damage. Obstructed EGR port in the intake manifold. After repair, reconnect all components, clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 76) to step 80). No test procedures have been omitted.
45. Step 80) Check EVR Solenoid Vacuum Inspect EVR solenoid and EGR vacuum hoses for leaks, restrictions, damage or incorrect routing. Repair as necessary. Disconnect vacuum hoses at EVR solenoid. Connect vacuum pump to EVR solenoid vacuum supply hose. Start engine and allow to idle. If vacuum gauge reading is 15 in. Hg or more, go to next step. If vacuum gauge reading is less than 15 in. Hg, isolate fault and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
46. Step 81) Check VPWR To EVR Solenoid Turn ignition off. Disconnect EVR solenoid wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at EVR solenoid wiring harness connector and chassis ground. If voltage 10.5 volts or more, go to next step. If voltage less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
47. Step 82) Check Resistance At EVR Solenoid Turn ignition off. Leave EVR solenoid wiring harness connector disconnected. Measure resistance across EVR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
48. Step 83) Check EVR For Short To PWR Leave EVR solenoid disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damage pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 47 (EVR) at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair EVR circuit short to PWR. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
49. Step 84) Check EVR Circuit For Open In Harness Leave ignition off and EVR solenoid disconnected. Measure resistance between test pin No. 47 (EVR) and EVR terminal at EVR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EVR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
50. Step 85) Check EVR Solenoid Vacuum Output Capability Leave ignition off. Connect EVR solenoid to wiring harness connector. Connect PCM to breakout box. Disconnect hose from EGR valve. Connect EGR vacuum hose to vacuum gauge. Start engine and allow to idle. Connect test pin No. 47 (EVR) at breakout box to chassis ground. If vacuum gauge reading is 4 in. Hg or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vacuum gauge is less than 4 in. Hg, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 85) to step 90). No test procedures have been omitted.
51. Step 90) Check EGR System Leave ignition off. Check entire EGR system for deterioration or signs of failure. Repair or replace as necessary. If system is okay, go to next step.
52. Step 91) Check EGR Valve Operation Leave ignition off. Disconnect EGR valve. Connect vacuum pump to EGR valve. Connect scan tester to DLC. Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tester, access DPFEGR PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 5 seconds. It may be necessary to increase engine speed to avoid stalling. When vacuum increases, PID voltage should increase as EGR valve opens. EGR operation should be smooth with no binding. If EGR valve opens smoothly and holds vacuum, go to next step. If EGR valve is not as specified, service or replace EGR valve. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). NOTE: In cold climate, EGR valve may freeze shut and thaw when engine warms, causing intermittent trouble code to be set in PCM memory.
53. Step 92) Check EVR For Short To PWR Turn ignition off. Leave EGR valve hose connected to vacuum gauge. Disconnect PCM 104-pin connector. Inspect for damage pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Connect jumper wire between test pin No. 47 (EVR) at breakout box and chassis ground to turn EVR on. Vacuum gauge reading should be more than 4.0 in. Hg. Observe vacuum gauge for fault while tapping lightly on EVR solenoid. Fault will be indicated by a sudden drop of vacuum. Wiggle EVR vacuum hoses, wiring harness and connector. If fault is indicated, isolate and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If no faults are indicated, symptom cannot be identified at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 110). No test procedures have been omitted.
54. Step 110) DTC P1409 This code indicates self-test has detected electrical malfunction in EVR circuit. Possible causes are as follows: EVR circuit open or shorted. Faulty EVR solenoid. Faulty PCM. Turn ignition off. Leave EVR solenoid wiring harness connector disconnected. Measure resistance across EVR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
55. Step 111) Check VPWR To EVR Solenoid Turn ignition off. Disconnect EVR solenoid wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at EVR solenoid wiring harness connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
56. Step 112) Check EVR Circuit Continuity Leave ignition off and EVR solenoid disconnected. Disconnect PCM 104-pin connector. Inspect for damage pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 47 (EVR) and EVR terminal at EVR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EVR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
57. Step 113) Check EVR For Short To PWR Leave EVR solenoid disconnected. Turn ignition off. Turn ignition on. Measure resistance between test pin No. 47 (EVR) and test pins No. 71 and 97 (VPWR) at breakout box. Measure resistance between test pin No. 47 (EVR) and test pins No. 24 and 103 (PWR GND) at breakout box. If each resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any resistance is less than 10,000 ohms, repair EVR circuit short to PWR or PWR GND and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 113) to step 120). No test procedures have been omitted.
58. Step 120) Continuous Memory DTC P1409 This continuous DTC indicates self-test has detected electrical malfunction in EVR circuit. Possible causes are as follows: EVR circuit open or shorted. Faulty EVR solenoid. Faulty PCM. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 47 (EVR) and No. 24 (PWR GND) at breakout box. Voltage should be more than 10.5 volts. Observe voltmeter for indication of fault while wiggling EVR wiring harness and connector. Fault is indicated by a sudden jump in voltage reading. Tap lightly on sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no faults are indicated, symptom cannot be identified at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 120) to step 130). No test procedures have been omitted.
59. Step 130) DTC P0400 This code indicates EGR system malfunction. Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using scan tester, access DPFEGR PID. If voltage is more than 0.2 volt, go to next step. If voltage is 0.2 volt or more, go to step 134).
60. Step 131) Leave ignition on. If DPFEGR PID value is less than 4 volts, go to next step. If DPFE PID value is 4 volts or more, go to step 137).
61. Step 132) Start engine and allow to idle. If engine will not start/run, go to next step. If DPFEGR PID value increases by 0.15 volt or more, go to next step. If DPFEGR PID voltage increases by less than 0.15 volt, go to step 160).
62. Step 133) Turn ignition off. Disconnect and plug EGR hose. Compare voltage to previous voltage. If DPFEGR PID value increases by 0.15 volt or more, service or replace EGR valve and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If DPFEGR PID voltage does not increase by 0.15 volt, go to step 150).
63. Step 134) Generate Opposite DPFE Signal Turn ignition off. Disconnect DPFE wiring harness connector. Using a jumper wire, connect DPFE SIG and VREF terminals at wiring harness connector. Turn ignition on. Using scan tester, access DPFEGR PID. If scan tester error occurs, disconnect jumper wire and go to next step. If DPFEGR PID value is not 4-6 volts, remove jumper wire and go to next step. If DPFEGR PID value is 4-6 volts, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
64. Step 135) Measure VREF Voltage At DPFE Sensor Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
65. Step 136) Check DPFE SIG For Short To Ground Leave DPFE sensor disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and test pins No. 91 (SIG RTN), 51 and 103 (PWR GND). If each measurement is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.
66. Step 137) Check DPFE SIG For Short To Power Turn ignition off. Disconnect DPFE wiring harness connector. Turn ignition on. Measure voltage between DPFE SIG terminal at wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 139).
67. Step 138) Leave ignition off and DPFE sensor disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 65 (DPFE SIG) and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is 10.5 volts or more, repair short between DPFE SIF and PWR circuit. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST.
68. Step 139) Generate Opposite DPFE Signal Turn ignition off. Disconnect DPFE wiring harness connector. Using a jumper wire, connect DPFE SIG and SIG RTN terminals at wiring harness connector. Turn ignition on. Using scan tester, access DPFEGR SIG PID. If scan tester error occurs, disconnect jumper wire and go to step 144). If DPFEGR PID value is.05 volt or more, go to step 142). If DPFEGR PID value is less than.05 volt, remove jumper wire and go to next step.
69. Step 140) Verify VREF Is Within Range Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
70. Step 141) Check DPFE SIG For Short To VREF Leave DPFE sensor disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 90 (VREF) at breakout box. If resistance is 10,000 ohms or more, replace DPFE sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.
71. Step 142) Check DPFE SIG For Open Circuit Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and DPFE SIG terminal at DPFE sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
72. Step 143) Check SIG RTN For Open Circuit Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal of DPFE sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat QUICK TEST.
73. Step 144) Check DPFE SIG For Short To VREF Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 90 (VREF) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, repair short between DPFE SIG and VREF circuit. Repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 144) to step 150). No test procedures have been omitted.
74. Step 150) Check EGR System Vacuum Hoses Using vehicle's vacuum diagram label, check EGR system vacuum hoses for damage, tight connections and correct routing. If hoses are okay, go to next step. If hoses are not okay, repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
75. Step 151) Check EGR Flow At Idle With EVR Solenoid Disconnected Turn ignition on. Using scan tester, not DPEGR PID voltage. Disconnect EVR solenoid connector. Start engine and allow to idle. If DPFEGR PID value increases by 0.15 volt or more, go to next step. If DPFEGR PID voltage increase by less than 0.15 volt, go to step 153).
76. Step 152) Check EVR Vent Turn ignition off. Disconnect EVR solenoid vent cap and vacuum hoses. Remove EVR filter and inspect for restriction. Using a vacuum pump, apply 15 in. Hg to EVR vent. If EVR solenoid is plugged or restricted, repair or replace as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If solenoid is not plugged or restricted, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.
77. Step 153) Check EVR Solenoid Coil Resistance Turn ignition off. Disconnect EVR solenoid wiring harness connector. Measure resistance between EVR terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
78. Step 154) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, go to next step. If voltages are not as specified, replace DPFE sensor. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
79. Step 155) Check EVR Circuit For Short To Ground Leave ignition off and EVR solenoid disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 47 (EVR) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, repair short between EVR circuit and ground. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 155) to step 160). No test procedures have been omitted.
80. Step 160) Check For Reversed Pressure Hoses Check hoses for proper connection. DPFE port marked HI should connect to exhaust side of orifice tube. DPFE port marked REF should connect to intake side of orifice tube. (Scheme 36) If hoses are not routed correctly, repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hoses are routed correctly, go to next step.
81. Step 161) Inspect Pressure Hoses Check both pressure hoses between DPFE sensor and EGR orifice tube for clean, tight connection. Ensure hoses are original equipment. Ensure hose is not pinched, wet, frozen or contaminated. Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hoses are okay, go to next step.
82. Step 162) Vacuum Check DPFE Sensor Output Turn ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 8-9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, go to next step. If voltages are not as specified, replace DPFE sensor. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
83. Step 163) Check EGR Valve Function Turn ignition off. Leave scan tester connected to DLC. Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tester, access DPFEGR and RPM PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 10 seconds. It may be necessary to increase engine speed to avoid stalling. As vacuum increases, PID voltage should rise above 2.5 volts. When vacuum is held steady, PID voltage should hold steady. If vacuum is as specified, reconnect all components and go to next step. If vacuum is not as specified, service or replace EGR valve. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
84. Step 164) Check EVR Solenoid Vacuum Inspect EVR solenoid and EGR vacuum hoses for leaks, restrictions, damage or incorrect routing. Repair as necessary. Disconnect vacuum hoses at EVR solenoid. Connect vacuum pump to EVR solenoid vacuum supply hose. Start engine and allow to idle. If vacuum gauge reading is 15 in. Hg or more, go to next step. If vacuum gauge reading is less than 15 in. Hg, isolate fault and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
85. Step 165) Check VPWR To EVR Solenoid Turn ignition off. Disconnect EVR solenoid wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at EVR solenoid wiring harness connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
86. Step 166) Check Resistance at EVR Solenoid Turn ignition off. Leave EVR solenoid wiring harness connector disconnected. Measure resistance across EVR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
87. Step 167) Check EVR For Short To PWR Leave EVR solenoid disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 47 (EVR) at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair EVR circuit short to PWR. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
88. Step 168) Check EVR Circuit For Open In Harness Leave ignition off and EVR solenoid disconnected. Measure resistance between test pin No. 47 (EVR) and EVR terminal at EVR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EVR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
89. Step 169) Check EVR Solenoid Vacuum Output Capability Leave ignition off. Reconnect EVR solenoid to wiring harness connector. Connect PCM to breakout box. Disconnect hose from EGR valve. Connect EGR vacuum hose to vacuum gauge. Start engine and allow to idle. Connect test pin No. 47 (EVR) at breakout box to chassis ground. If vacuum gauge reading is 4 in. Hg or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vacuum gauge is less than 4 in. Hg, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 169) to step 180). No test procedures have been omitted.
90. Step 180) Continuous Memory DTC P0400 This DTC indicates EGR system malfunction during vehicle operation. Possible causes are as follows: Restriction in EGR vacuum circuit. EGR system fault. Ensure all DTCs are recorded. Clear PCM memory. Drive vehicle 5 miles. Perform KOEO and «KOER SELF-TEST»(ref-23594-S04533554802001010300000). If DTC P0400 is present in KOEO or KOER, go to step 130). If DTC is present in continuous memory only, remove and inspect EGR valve and intake manifold. Repair as necessary. If DTC P0400 is not present, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the exhaust system and downstream HO2S.

Internal damage of a catalytic converter is usually caused by abnormal engine operation upstream of catalyst. Conditions that produce higher than normal temperatures in the catalytic converter, such as cylinder misfire, are likely suspects.

MISFIRE DIAGNOSTIC TROUBLE CODES (DTC)

1. Step 1) DTC P0420, P0421, P0430 & P0431: Check Possible Cause Of Misfire DTC P0420 and P0421 indicates bank one catalyst system efficiency is minimum requirement. DTC P0430 and P0430 indicates bank 2 catalyst system efficiency is minimum requirement. Possible causes are as follows: Use of leaded fuel. Oil contamination. Cylinder misfire. Fuel pressure too high. HO2S sensor improperly connected. Damaged exhaust system component. Faulty ECT sensor. Faulty HO2S. Ensure ignition timing is correct. Retrieve all Continuous Memory DTCs. If misfire code(s) is not present, go to next step. If misfire code(s) is present, isolate cylinder and repair as necessary.
2. Step 2) Check HO2S Monitor DTCs If DTCs P0136, P0138, P0140, P0141, P0156, P0158, P0160, or P0161 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step.
3. Step 3) Check ECT Sensor DTCs If DTCs P0117, P0118, P0125 or P1117 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step.
4. Step 4) If any codes except P0420, P0421, P0430 and/or P0430 were present in step 1), service as necessary before continuing. If no codes except P0420 and/or P0430 were present in step 1), go to next step.
5. Step 5) Check Rear HO2S Wiring Harness Turn ignition off. Ensure HO2S wiring harness is correctly routed and connectors are tight. Repair or replace as necessary. If wiring harness and connectors are okay, go to next step.
6. Step 6) Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123322) article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to CIRCUIT TEST HC.
7. Step 7) Check For Exhaust System Leaks If exhaust system leaks, it may cause catalyst monitor efficiency test to fail. Inspect exhaust system for cracks, loose connections or punctures. Repair or replace as necessary. If exhaust system is okay, go to next step.
8. Step 8) Check For Exhaust System Restrictions Inspect exhaust system for collapsed areas, dents or excessive bending. Repair or replace as necessary. If exhaust system is okay, go to next step.
9. Step 9) Check Manifold Vacuum Install tachometer. Connect vacuum gauge to intake manifold vacuum source. Start engine and raise engine speed to 2000 RPM. Manifold vacuum should rise to more than 16 in. Hg. If manifold vacuum is okay, go to next step. If manifold vacuum is low, go to step 11).
10. Step 10) Leave tachometer and vacuum gauge connected. Start engine and raise engine speed to 2000 RPM. On a non-restricted system, manifold vacuum should quickly rise to normal range as increased RPM is maintained. On a restricted system, manifold vacuum will slowly rise to normal range as increased RPM is maintained. If manifold vacuum is okay, no indication of exhaust leak or restriction has been detected and testing is complete. If manifold vacuum is low or slow to respond, go to next step.
11. Step 11) Leave tachometer and vacuum gauge connected. Remove exhaust pipe from exhaust manifold. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is downstream from exhaust manifold. Reconnect exhaust pipe to exhaust manifold and go to next step. If manifold vacuum is still low or slow to respond, fault is in exhaust manifold or intake manifold gasket. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
12. Step 12) Leave tachometer and vacuum gauge connected. Disconnect muffler/tailpipe assembly from rear of catalytic converter. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is in muffler/tailpipe assembly. Repair or replace as necessary and test drive vehicle to verify elimination of symptom. If manifold vacuum is still not okay, fault is in catalytic converter. Repair or replace as necessary. Check tailpipe/muffler assembly for debris from catalytic converter. Test drive vehicle to verify elimination of symptom.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Use this test to diagnose Positive Crankcase Ventilation (PCV) valve and related vacuum hoses.

PCV System Schematic. Scheme 39

1. Step 1) Check PCV Valve Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, go to next step. Replace PCV valve if it does not rattle when shaken.
2. Step 2) Check PCV System Start engine and warm to normal operating temperature. Disconnect hose from remote air cleaner or outlet tube. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, go to next step. If vacuum from hose holds paper in place for one minute, PCV system is okay and testing is complete.
3. Step 3) Check Evaporative Emission System Disconnect evaporative emission hose from PCV system and plug connector. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, isolate vacuum leak or restriction and repair as necessary. If vacuum from hose holds paper in place for one minute, go to CIRCUIT TEST HX.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (BATT+, EAIR, EAIR MONITOR and Ground).
2. Solid State Relay (SSR).
3. Electric Air Pump (EAP).
4. Air injection by-pass solenoid.
5. Air injection diverter solenoid.
6. Air injection diverter valve.
7. Air injection by-pass solenoid.
8. Powertrain Control Module (PCM).

AIR Test Circuit & Connector Terminals. Scheme 40

1. Step 1) DTC P0412: Check BATT+ At SSR This DTC indicates EAIR primary circuit failure. Possible causes are as follows: EAIR circuit open or short to power. AIR by-pass solenoid failure. Faulty PCM. Turn ignition off. Disconnect SSR. Turn ignition on. Measure voltage between SSR connector BATT+ terminal and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 7).
2. Step 2) Check EAIR Circuit Continuity Turn ignition off. Leave SSR disconnected. Disconnect AIR by-pass solenoid. Temporarily remove secondary air dedicated fuse. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 70 (EAIR) at breakout box and EAIR terminal at SSR connector. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 5 ohms, go to next step.
3. Step 3) Check EAIR Circuit Short To Power Leave ignition off. Measure resistance between test pin No. 70 and test pins No. 71, 90 and 97 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
4. Step 4) Leave ignition off. Reconnect AIR by-pass solenoid. Measure resistance between test pin No. 70 and test pins No. 71, 90 and 97 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, replace AIR by-pass solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
5. Step 5) Leave ignition off. Reconnect SSR. Measure resistance between test pin No. 70 and test pins No. 71, 90 and 97 at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, replace AIR by-pass solenoid and repeat QUICK TEST.
6. Step 6) Check BATT+ Circuit Continuity Leave ignition off. Disconnect SSR. Measure resistance between SSR connector terminal "A" and AIR system dedicated fuse. (Scheme 40) If resistance is less than 5 ohms, replace dedicated fuse and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open in BATT+ circuit and repeat QUICK TEST.
7. Step 7) DTC P0411 Check secondary air hoses for damage, wear or poor connections. Repair or replace as necessary. If all hoses are okay, go to next step.
8. Step 8) Check EAIR MONITOR Circuit For Short To Power Leave ignition off and SSR disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, repair EAIR MONITOR circuit short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
9. Step 9) Check EAIR MONITOR Circuit For Short To Power Turn ignition off. Reconnect SSR connector. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
10. Step 10) Leave ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. Measure voltage between test pin No. 70 at breakout box and chassis ground. If either voltage measurements is 10.5 volts or less, go to next step. If both voltage measurements more than 10.5 volts, replace SSR and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
11. Step 11) Check Air Pump Hoses Turn ignition off. Inspect hoses between air pump and air control valves. If hoses are damaged or restricted, repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hoses are okay, go to next step.
12. Step 12) Check Air Pump Operation Leave ignition off. Disconnect air hose from air control valve. Start engine and allow to idle. After a 5 second delay, airflow should be present for 30-90 seconds. If airflow is as specified, go to next step. If airflow is not as specified, go to step 17).
13. Step 13) Check For Vacuum At Air Control Valve Leave ignition off. Disconnect vacuum hose from air control valve. Start engine and allow to idle. After about 5 seconds, vacuum should be present for 30-90 seconds. If vacuum is as specified, go to next step. If vacuum is not as specified go to step 30).
14. Step 14) Check Air Control Valve Leave ignition off. Disconnect and plug air tube at air control valve outlet side. Inspect air tubes for damage and repair as necessary. Start engine and allow to idle. After about 5 seconds, airflow should be present at air control valve for 30-90 seconds. If airflow is as specified, go to next step. If airflow is not as specified, replace air control valve and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 17). No test procedures have been omitted.
15. Step 17) Check Air Pump Operation Leave ignition off. Disconnect air pump wiring harness connector. Start engine and allow to idle. Measure voltage between connector EAIR MONITOR terminal and ground. (Scheme 40) After about 5 seconds, voltage should be 10.5 volts or more for 20-30 seconds. If airflow is as specified, go to next step. If airflow is not as specified, go to step 21).
16. Step 18) Check Ground Circuit Leave ignition off and air pump disconnected. Measure resistance between air pump connector ground terminal and chassis ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
17. Step 19) Check Air Pump Hoses Turn ignition off. Inspect air inlet hose. If hose is damaged or restricted, repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If hose is okay, go to next step.
18. Step 20) DTC 1413: Check For Voltage At SSR Leave ignition off. Disconnect SSR. Turn ignition on. Measure voltage between SSR connector BATT+ terminal and chassis ground. If voltage is less than 10.5 volts, go to step 25). If voltage is 10.5 volts or more, go to next step.
19. Step 21) Check EAIR MONITOR Circuit Voltage Leave ignition off. Reconnect SSR. Disconnect air pump wiring harness connector. Start engine and allow to idle. Measure voltage between connector EAIR MONITOR terminal and chassis ground. If voltage is more than 10.5 volts and DTC P0411 is present, replace air pump. If voltage is more than 10.5 volts and DTC P0411 is not present, go to step 24). If voltage is 10.5 volts or less, go to next step.
20. Step 22) Check EAIR MONITOR Circuit Continuity Turn ignition off. Disconnect SSR. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 5 at breakout box and EAIR MONITOR terminal at SSR connector. Measure resistance between EAIR MONITOR terminal at SSR connector and EAIR MONITOR terminal at air pump connector. If both resistance measurements are 5 ohms or more, repair open in EAIR MONITOR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 5 ohms, go to next step.
21. Step 23) Check EAIR MONITOR Circuit For Short To Ground Turn ignition off. Leave SSR and air pump disconnected. Measure resistance between test pin No. 5 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is more than 10,000 ohms, replace SSR and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any resistance measurement is 10,000 ohms or less, repair EAIR MONITOR circuit short to ground and repeat QUICK TEST.
22. Step 24) Check EAIR MONITOR Circuit Voltage Leave ignition off. Reconnect air pump. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Start engine and allow to idle. Measure voltage between test pin No. 5 and chassis ground. After about 5 seconds, voltage should be 10.5 volts or more. If voltage is as specified, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not as specified, repair open in EAIR MONITOR circuit and repeat QUICK TEST.
23. Step 25) Check BATT+ Circuit Continuity Leave ignition off and SSR disconnected. Measure resistance between SSR connector terminal "A" and AIR system dedicated fuse. (Scheme 40) If resistance is less than 5 ohms, replace dedicated fuse and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open in BATT+ circuit and repeat QUICK TEST.
24. Step 26) DTC P1414: Check EAIR MONITOR Circuit Continuity Turn ignition off. Disconnect air pump and SSR wiring harness connectors. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 5 at breakout box and EAIR MONITOR terminal at air pump connector. If resistance is 5 ohms or more, repair open in EAIR MONITOR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 5 ohms, go to next step.
25. Step 27) Leave ignition off and air pump disconnected. Measure resistance between air pump terminals. If resistance is 0.5-5.0 ohms, go to next step. If resistance is not 0.5-5.0 ohms, replace air pump and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
26. Step 28) Check EAIR Circuit For Short To Ground Turn ignition off. Leave SSR disconnected. Disconnect air injection by-pass solenoid. Measure resistance between test pin No. 70 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair EAIR circuit short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
27. Step 29) Check EAIR Monitor Circuit For Short To Power Leave ignition off and SSR disconnected. Reconnect air pump. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 5 volts or more, repair EAIR MONITOR circuit short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is less than 5 volts, replace PCM and repeat QUICK TEST.
28. Step 30) Check Vacuum Hoses Turn ignition off. Disconnect vacuum hose from air injection by-pass solenoid. Connect vacuum hose to vacuum pump. Start engine and allow to idle. If vacuum is 15 in. Hg or more at idle, reconnect vacuum hose to air injection by-pass solenoid and go to next step. If vacuum less than 15 in. Hg, replace vacuum hose and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
29. Step 31) Check Air By-Pass Solenoid Disconnect air injection by-pass solenoid wiring harness connector. Connect scan tester to DLC. Turn ignition on. Using scan tester, access Output Test Mode (OTM). Connect voltmeter to air injection by-pass solenoid connector. Observe voltmeter while operating throttle. If voltage cycles 0.5 volt or more, go to next step. If voltage does not cycle 0.5 volt or more, go to step 35).
30. Step 32) Remain in OTM. Reconnect air injection by-pass solenoid wiring harness connector. Disconnect vacuum hose from air injection by-pass solenoid. Connect vacuum hose to vacuum pump. Apply 16 in Hg. to solenoid. Apply and release throttle. If vacuum releases as throttle cycles, repair vacuum hose between solenoid and air control valve. If vacuum does not release as throttle cycles, check solenoid vacuum supply hose. If hose is okay, replace air injection by-pass solenoid hose. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 32) to step 35). No test procedures have been omitted.
31. Step 35) Check Air By-Pass Solenoid Resistance Turn ignition off. Disconnect air injection by-pass solenoid wiring harness connector. Measure resistance between connector terminals. If resistance is 50-100 ohms, go to next step. If resistance is not 50-100 ohms, replace air injection by-pass solenoid.
32. Step 36) Check BATT+ Circuit Voltage Leave air injection by-pass solenoid disconnected. Turn ignition on. Measure voltage between connector BATT+ terminal and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in BATT+ circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
33. Step 37) Check EAIR Circuit Continuity Leave air injection by-pass solenoid disconnected. Turn ignition off. Disconnect SSR wiring harness connector. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 70 at breakout box and EAIR terminal at air pump connector. If resistance is 5 ohms or more, repair open in EAIR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 5 ohms, go to next step.
34. Step 38) Check EAIR Circuit For Short To Ground Turn ignition off. Leave air injection by-pass solenoid and SSR disconnected. Measure resistance between test pin No. 70 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair EAIR circuit short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
35. Step 39) Check EAIR Circuit For Short To Power Leave ignition off. Leave air injection by-pass solenoid and SSR disconnected. Measure resistance between test pin No. 70 and test pins No. 71 and 97 at breakout box. If each resistance measurement is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
36. Step 40) Diagnostic Trouble Code (DTC) P0411 DTC P0411 indicates that Secondary Air is not being diverted when requested. Possible causes include: Vacuum hoses are damaged. AIRB/AIRD valve is inoperative. Air Pump is inoperative. AIRB/AIRD solenoids are damaged. Visually inspect the vacuum lines for disconnects in the AIR system. Visually inspect for proper vacuum line routing. Refer to VECI decal. Visually inspect Air pump for broken or loose Air Pump Belt. See step 81) for adjustment or replacement. If any problems were found, service as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If no problems were found, go to next step.
37. Step 41) Check AIR vacuum lines Carefully inspect the vacuum lines in the following places: between AIRB solenoid and AIRB valve. between AIRD solenoid and AIRD valve. between Manifold Vacuum TREE and AIRB/AIRD solenoids. Check for obstructions, cracks, kinks, leaks, etc. If all vacuum lines are in good condition, see step 42) (vehicles with a single AIRB valve), step 47) (vehicles with a single AIRD valve or both valves), or step 55) (vehicles with a single combination AIRD/AIRB valve). For all vehicles, if any vacuum lines are not in good condition, service as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
38. Step 42) Check for vacuum at the AIRB valve Turn ignition off. Disconnect control vacuum line from the AIRB valve. Start engine and warm to normal operating temperature. Check for vacuum at control vacuum line. If vacuum is present, see step 43). If vacuum is not present, see step 63).
39. Step 43) Inspect AIRB valve Turn ignition off. Disconnect air hose at AIRB valve outlet. Inspect AIRB valve outlet for damage from hot exhaust gas. If AIRB valve is damaged, replace AIRB valve and see step 60) to inspect air check valve. If AIRB valve is not damaged, go to next step.
40. Step 44) Check AIRB valve diaphragm Connect auxiliary vacuum source to AIRB valve. Apply 34 kPa (10 in. Hg) vacuum and trap. If valve holds vacuum, leave vacuum applied and see step 45). If valve does not hold vacuum, replace AIRB valve and verify that a symptom no longer exists.
41. Step 45) Check AIRB operation/flow Start engine and raise speed to 1500 RPM. Listen or feel for air flow at valve outlet. If air flow is present, see step 46). If no air flow is present, see step 71) to check air pump operation and belt.
42. Step 46) Check AIRB operation/dump Vent auxiliary vacuum source to zero. Listen or feel for air flow switching from the valve outlet to the dump port or silencer ports. If air flow is switching, see step 47). If air flow is not switching, replace AIRB valve.
43. Step 47) Visually inspect AIRD valve Turn ignition off. Disconnect hoses from AIRD valve outlets. Inspect outlets for damage from hot exhaust gases. If AIRD valve is damaged, replace AIRD valve and see step 60) for air check valve. If AIRD valve is okay, go to next step.
44. Step 48) Check for vacuum at AIRD valve NOTE: Steps 48) and 49) require attention to time. Leave ignition off. Disconnect vacuum supply line from vacuum nipple on valve. Start engine and warm to normal operating temperature. After starting engine, check for vacuum. If vacuum is present after a 10 second delay, go to next step. If vacuum is not present after a 10 second delay, see step 63) to verify solenoid AIRD vacuum function.
45. Step 49) Check AIRD valve diaphragm Connect an auxiliary vacuum source to the AIRD valve. Apply 34 kPa (10 in. Hg) vacuum and hold. If valve holds vacuum, go to next step. If valve does not hold vacuum, replace AIRD valve and verify that a symptom no longer exists.
46. Step 50) Check for air supply at AIRD valve Start engine and warm to normal operating temperature. Verify that air is being supplied to the AIRD valve. If air is present, go to next step. If air is not present, see step 71) for AIR pump operation.
47. Step 51) Check for air at AIRD outlet(s) Leave engine running. Apply 34 kPa (10 in. Hg) of vacuum to AIRD valve. Raise engine speed to 1500 RPM. If air flow comes out of the valve outlet, go to next step. If no air flow comes out of outlet, replace AIRD valve and verify that a symptom no longer exists.
48. Step 52) Check for air at other AIRD outlet Leave engine running. Vent the auxiliary vacuum source to zero. If air flow switches from one outlet to the other outlet, see step 63). If air flow does not switch from one outlet to the other, replace AIRD valve and verify that a symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 55). No test procedures have been omitted.
49. Step 55) Visually inspect combination AIRB/AIRD valve Turn ignition off. Disconnect hoses from combination Air Control Valve outlets. Inspect outlets for damage from hot exhaust gases. If valve appears to be damaged, replace combination AIRB/AIRD valve and see step 60) to verify check valve function. If valve does not appear to be damaged, go to next step.
50. Step 56) Check combination AIRB/AIRD valve Leave ignition off and outlet hoses disconnected. Disconnect and plug the air bypass vacuum supply line. Start engine and raise speed to 1500 RPM. If air flow is present at combination air control vents, go to next step. If air flow is not present at combination air control vents, see step 71) to verify AIR Pump function. If AIR Pump function is okay, replace combination AIRB/AIRD valve.
51. Step 57) Check for manifold vacuum Start engine and allow to idle. Disconnect both the air bypass and air diverter vacuum supply lines. Measure manifold vacuum at both supply lines. Measure vacuum at air diverter supply line for 5-30 seconds after starting (while engine idle stabilizes). Measure vacuum at air bypass line (timing is not critical). If appropriate manifold vacuum is present, go to next step. If appropriate manifold vacuum is not present, see step 63).
52. Step 58) Check combination AIRB/AIRD valve operation Turn ignition off. Reconnect the air bypass vacuum supply line. Disconnect and plug air diverter vacuum supply line. Start engine and raise speed to 1500 RPM. If air flow is present at one outlet and no air flow is present at the other outlet, go to next step. If air flow is present at both outlets or no air flow is present at either outlet, replace combination AIRB/AIRD valve, reconnect all hoses and verify that a symptom no longer exists.
53. Step 59) Check combination AIRB/AIRD valve operation with vacuum applied. NOTE: If the combination valve is a bleed type valve, the amount of air flow will be affected. Turn ignition off. Unplug air diverter vacuum supply line and leave disconnected. Apply 27-34 kPa (8-10 in. Hg) vacuum to air diverter nipple on the combination valve. Start engine and raise speed to 1500 RPM. If air flow is present at valve outlet, see step 63). If no air flow is present at valve outlet, replace combination AIRB/AIRD valve and verify the a symptom no longer exists.
54. Step 60) Visually inspect check valve system (externally) Turn ignition off. Visually inspect secondary air hoses, tubes, control valves and check valves for leaks or external signs of damage (from back flow of hot exhaust gases). If hoses and valves are intact, go to next step. If hoses or valves are not intact, service or replace damaged parts including check valve, and verify that a symptom no longer exists.
55. Step 61) Visually inspect hoses at valves (internally) Remove hose from check valve inlet. Inspect inside the hose for damage from hot exhaust gas. If the hose is clean and undamaged, go to next step. If the hose is dirty or damaged, replace hose, replace check valve and verify that a symptom no longer exists.
56. Step 62) Inspect check valve function NOTE: Check valve may "burble" as air is drawn in. Start engine and allow to idle. Listen for escaping exhaust gas, or feel for gas (only if engine temperature is at an acceptable level). If any exhaust gas is escaping, replace check valve and verify that a symptom no longer exists. If no exhaust gas is escaping, check for other possible fault causes.
57. Step 63) Check AIRB and AIRD solenoids electrical operation Connect Scan Tool. Set DVOM to 20 volt scale. Select OUTPUT TEST MODE (DTM). See «SELF-DIAGNOSTIC SYSTEM»(ref-23594-S31960577812001010300000). Disconnect suspect solenoid. Connect DVOM positive test lead to VPWR circuit and negative test lead to signal circuit of suspect vehicle harness connector. While observing DVOM, turn outputs on, then turn outputs off. If the solenoid circuit cycles voltage, go to next step. If the solenoid circuit does not cycle voltage, remove jumper and see step 76).
58. Step 64) Check vacuum supply to AIRD/AIRB solenoid Turn ignition off. Disconnect vacuum inlet line at suspect (AIRD/AIRB) solenoid. Start engine and allow to idle. Check vacuum at line. If vacuum is present, replace AIRB or AIRD solenoid. Reconnect all components. Clear DTCs. See «CLEARING CODES»(ref-23594-S23040103782001010300000). Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vacuum is not present, go to next step. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 64) to step 66). No test procedures have been omitted.
59. Step 66) Check vacuum supply to reservoir Leave ignition off. Disconnect vacuum inlet line at reservoir. NOTE: For single piece connector, this port is marked "man" or "vac". Start engine. Check for vacuum on line. If vacuum is present, see step 68). On vehicles with a check valve, if vacuum is not present, see step 69). On vehicles without a check valve, if vacuum is not present, inspect vacuum line for leaks, blockages, etc. and repair or replace as necessary. Verify that a symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 66) to step 68). No test procedures have been omitted.
60. Step 68) Check reservoir to hold vacuum Turn ignition off. Connect vacuum gauge to outlet port (not marked "man" or "vac"), keeping inlet line connected to vacuum port. Start engine and allow to idle for 30 seconds. If gauge increases to approximately 15-20 in. Hg, replace reservoir outlet hose. If problem is still present, check for other possible fault causes. If gauge does not increase to approximately 15-20 in. Hg, replace vacuum reservoir and verify that a symptom no longer exists.
61. Step 69) Check air flow at check valve Turn ignition off. Disconnect check valve from vacuum lines (note which direction check valve is installed). Connect auxiliary vacuum source to black side of check valve. Connect vacuum gauge to opposite side of check valve. Apply 54 kPa (16 in. Hg) vacuum to black side. If gauge indicated 54 kPa (16 in. Hg), go to next step. If gauge does not indicate 54 kPa (16 in. Hg), replace check valve and verify that a symptom no longer exists.
62. Step 70) Verify check valve's ability to hold vacuum Leave ignition off. Disconnect auxiliary vacuum source from check valve. If vacuum gauge reading remains above 50 kPa (15 in. Hg) for 10 seconds, check for other possible fault causes. If vacuum gauge reading does not remain above 50 kPa (15 in. Hg) for 10 seconds, replace check valve and verify that a symptom no longer exists.
63. Step 71) Check belt tension CAUTION: DO NOT pry on pump to adjust belt. The aluminum housing is likely to collapse. Refer to AIR pump drive belt adjustment. Turn ignition off. Check belt tension. If belt tension is adjusted properly, go to next step. If belt tension is not adjusted properly, use Belt Tension Gauge T63L-8620-A to measure tension. Tighten to specification using Tool T75L09480-A.
64. Step 72) Check air pump operation Leave ignition off. Disconnect air supply hose from AIRB valve. Start engine. Check air flow at the pump outlet. If air flow increases as engine speed increases, check for other possible fault causes. On vehicles equipped with silencer/filter, if air flow does not increase as engine speed increases, go to next step. On vehicles not equipped with silencer/filter, if air flow does not increase as engine speed increases, replace air pump.
65. Step 73) Check silencer/filter for obstruction Disconnect inlet hose (if equipped). Inspect inlet of silencer/filter for blockage (bugs, leaves, debris, etc.). If inlet is open, replace air pump and verify that a symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 73) to step 75). No test procedures have been omitted.
66. Step 75) DTCs P0413, P0414, P0416 and P0417: Check voltage of VPWR circuit DTCs P0413, P0414, P0416 and P0417 indicate that voltage output for Secondary Air Injection solenoid(s) did not change when activated. Possible causes include: AIRB/AIRD circuits shorted to power. AIRB/AIRD circuits open or shorted to ground. AIRB/AIRD resistance out of range. Damaged Powertrain Control Module (PCM). Disconnect AIRB/AIRD solenoid connector. Turn ignition on, but leave engine off. Measure voltage between VPWR circuit and battery ground of one solenoid, then repeat for the other solenoid. If each voltage is greater than 10.5 volts, go to next step. If either voltage is 10.5 volts or less, service open harness circuit. Reconnect both solenoids and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
67. Step 76) Measure AIRB/AIRD solenoid resistance Turn ignition off. Disconnect both the AIRB/AIRD solenoid connectors and measure both solenoid resistance. If each resistance is between 50 and 100 ohms, go to next step. If either resistance is not between 50 and 100 ohms, replace AIRB/AIRD solenoid assembly. Reconnect both solenoids and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
68. Step 77) Check circuit continuity Leave ignition off. Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary. Install breakout box, leaving PCM disconnected. Measure resistance between AIRB circuit at breakout box and AIRB circuit at vehicle harness connector. Measure resistance between AIRD circuit at the breakout box and AIRD circuit at vehicle harness connector. If each resistance is less than 5.0 ohms, go to next step. If either resistance is 5.0 ohms or greater, service open harness circuit. Remove breakout box. Reconnect PCM and both solenoids. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
69. Step 78) Check for short to ground Leave ignition off, breakout box installed and PCM disconnected. Disconnect Scan Tool. Disconnect both AIRB/AIRD solenoids. Measure resistance between AIRB circuit at the breakout box and Test Pins No. 51, 91 and 103. Measure resistance between AIRD circuit at the breakout box and Test Pins No. 51, 91 and 103 at the breakout box. If each resistance is greater than 10k ohms, go to next step. If any resistance is 10k ohms or less, locate and repair short to ground. Remove breakout box. Reconnect PCM and AIRB/AIRD solenoids. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
70. Step 79) Check for short to power Leave ignition off, breakout box installed, PCM disconnected and both AIRB/AIRD solenoids disconnected. Measure resistance between AIRB circuit at the breakout box and Test Pins No. 71 and 97. Measure resistance between AIRD circuit at the breakout box and Test Pins No. 71 and 97 at the breakout box. If each resistance is greater than 10k ohms, replace PCM. Remove breakout box, reconnect both solenoids and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any resistance is 10k ohms or less, locate and repair short to power. Remove breakout box. Reconnect PCM and AIRB/AIRD solenoids. Repeat QUICK TEST. If DTC is present, replace PCM.
71. Step 80) Check AIR solenoid NOTE: A rolling idle may be caused by a leaky AIR solenoid. «QUICK TEST»(ref-23594-S34023665322001010300000) may also indicate DTCs P0411, P0413, P1414, P0416 or P0417. Start engine and run until temperature is fully stabilized. Turn engine off. Disconnect vacuum hose at the AIR solenoid. Plug vacuum hose. Restart engine. After a few minutes of idling, the "rolling" idle should stop. If no rolling idle is present, unplug vacuum hose and verify that vacuum is present. If rolling idle stops or if vacuum is present, replace Secondary AIR solenoid assembly. If vacuum is not present or if rolling idle is still present, check for other possible fault causes. If vacuum is not present or if DTC P0411 is present, go to step 66).
72. Step 81) Excessive belt noise Possible causes include: Loose belt. Seized pump. Loose pulley. Loose or broken mounting brackets or bolts. CAUTION: DO NOT use pry bar to move the air pump for belt adjustment. Inspect for loose belt. Use Belt Tension Gauge T63L-8620-A to measure belt tension. If belt is loose, tighten to specification using Tool T75L09480-A. Verify that a symptom no longer exists. If belt is not loose, go to next step.
73. Step 82) Check loose pulley, mounting brackets Check for loose pulley and mounting brackets. Check for seized air pump. Check for broken bolts. If above components are all okay, check for other possible fault causes. If pump is seized, replace pump. If any bolts or brackets are loose or broken, replace as necessary and tighten bolts to 13.6-17.0 N.m (120-150 INCH lbs.).
74. Step 83) Check for excessive air noise NOTE: The Secondary AIR system is not completely noiseless. To determine if the AIR system is the root cause, proceed with the following step. Listen for any of the following noises: chirps, squeaks, ticks, putt-putt, hiss, rap or roar. If any of these noises are present, see step 81) to verify that the belt tension is correct. Disconnect the belt drive. Start engine and allow to idle. If the noise disappears, replace any cracked or worn hoses. Tighten mounting bolts to 34 N.m (25 ft. lbs.). DO NOT overtighten. Check air pump fittings and service as necessary. Reconnect belt and tighten to specification. Verify that a symptom no longer exists. If noise is still present, reconnect belt and tighten to specification.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. TA series throttle.
2. Series throttle stepper motor.
3. Series throttle controller.
4. Wiring harness circuits (TP-B, VREF, SIG RTN, VPWR, PWR GND, TAPW, TA-B1, TA-B2, BCOMM, TA-A1, TA-A2 & ACOMM).
5. Throttle Position Sensor B (TP-B).
6. Powertrain Control Module (PCM).

TA System Circuits & System Components. Scheme 41

TP-B Operational Range. Scheme 42

TA System Connectors & Test Circuits. Scheme 43

Scheme 44

1. Step 1) DTC P0222: Verify TP-B Voltage This DTC indicates TP-B voltage was below minimum during self-test. Possible causes are as follows: Open or shorted TP-B circuit. Open or shorted VREF circuit. Faulty TP-B. Faulty PCM. Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access TPB PID. If TPB PID voltage is less than 0.2 volts, go to next step. If TPB PID voltage is 0.2 volt or more, go to step 6).
2. Step 2) Turn ignition off. Disconnect TP-B wiring harness connector. Inspect connector for damage and repair if necessary. Connect jumper wire between connector terminals TP-B (Yellow/White wire) and VREF (Brown/White wire). Turn ignition on. Using scan tester, access TPB PID. If PID cannot be accessed, go to step 5). If PID voltage is 4-6 volts, replace TP-B and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 4-6 volts, go to next step.
3. Step 3) Leave TP-B disconnected. Turn ignition on. Measure voltage between connector terminals SIG RTN (Gray/Red wire) and VREF (Brown/White wire). If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
4. Step 4) Check TP-B For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 63 (TP-B) at the breakout box and TP-B (Yellow/White wire) terminal of TP-B wiring harness connector. If resistance is 5 ohms or more, repair open in TP-B circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 5 ohms, go to next step.
5. Step 5) Check TP-B Circuit For Short To Ground Or SIG RTN Turn ignition off. Measure resistance between test pin No. 63 (TP-B) and test pins No. 51, 91 and 103 (PWR GND) at the breakout box. If resistance 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 10,00 ohms, repair TP-B circuit short to ground or SIG RTN and repeat QUICK TEST.
6. Step 6) Wiggle Test Turn ignition on. Using scan tester, access TPB PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage. Lightly tap on sensor. Wiggle wiring harness between TP-B and PCM. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.
7. Step 10) DTC P0222: Verify TP-B Voltage This DTC indicates TP-B voltage was above maximum during self-test. Possible causes are as follows: TP-B circuit shorted to VREF. TP-B circuit shorted to PWR. SIG RTN circuit open. Faulty TP-B. Faulty PCM. Turn ignition off. Disconnect TP-B wiring harness connector. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access TPB PID. If PID voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, go to step 16).
8. Step 11) Check TP-B For Short To Power Turn ignition off. Disconnect TP-B sensor wiring harness connector. Inspect connector for damage and repair if necessary. Turn ignition on. Measure voltage between connector terminal TP-B (Yellow/White wire) and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 13).
9. Step 12) Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 63 (TP-B) and test pins No. 51 and 103 (PWR GND) at the breakout box. If voltage is 10.5 volts or more, repair short between PWR and TP-B circuit. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST.
10. Step 13) Turn ignition off. Leave TP-B wiring harness connector disconnected. Turn ignition on. Using scan tester, access TPB PID. If PID voltage is less than 0.1 volt, go to next step. If voltage is 0.1 volt or more, go to step 15).
11. Step 14) Leave TP-B disconnected and ignition on. Measure voltage between connector terminals SIG RTN (Gray/Red wire) and VREF (Brown/White wire). If voltage is 4-6 volts, replace TP-B and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 4-6 volts, perform procedures under CIRCUIT TEST C.
12. Step 15) Check TP-B Circuit For Short To VREF Leave TP-B disconnected and ignition on. Measure resistance between test pin No. 63 (TP-B) and 90 (VREF) at the breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 10,000 ohms, repair TP-B circuit short to VREF and repeat QUICK TEST.
13. Step 16) Wiggle Test Turn ignition on. Using scan tester, access TPB PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage. Lightly tap on sensor. Wiggle wiring harness between TP-B and PCM. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 20). No test procedures have been omitted.
14. Step 20) DTC P1220: Inspect Series Throttle (ST) System This DTC indicates series throttle control malfunctioned during self-test. Possible causes are as follows: Stepper motor circuit fault. PWR GND circuit open to Series Throttle Controller (STC). SIG RTN circuit open to STC. VPWR circuit open to STC. TAPW circuit open or shorted. Faulty Series Throttle (ST). Faulty ST stepper motor. Faulty STC. Faulty PCM. Turn ignition off. Remove air tube from ST. Inspect ST assembly for loose components or restrictions. Check throttle plate for binding. If throttle plate binds, go to next step. If throttle does not bind, go to step 22).
15. Step 21) Inspect ST Motor Turn ignition off. Remove TA assembly ( DO NOT separate ST from main throttle body). Remove ST stepper motor. Cycle throttle plate through full range of travel. Throttle plate should travel freely and throttle gear should contact stop screws in both directions. If throttle plate binds, replace ST stepper motor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If throttle does not bind, replace series throttle and repeat QUICK TEST.
16. Step 22) Turn ignition on. Using scan tester, access TPB PID. If PID voltage is less than 4.5 volts, go to next step. If voltage is 4.5 volts or more, go to step 33).
17. Step 23) Measure ST Stepper Motor Coil Resistance Turn ignition off. Disconnect ST stepper motor wiring harness connector. Check for 1-5 ohms resistance at the following ST stepper motor terminals: TA-B1 and BCOMM. TA-B2 and BCOMM. TA-A1 and ACOMM. TA-A2 and ACOMM. If each coil measurement 1-5 ohms, go to next step. If any measurement is not 1-5 ohms, replace ST stepper motor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). (Scheme 44): Stepper Motor Terminals
18. Step 24) Check ST Stepper Motor Coil For Short Circuit Leave ignition off and ST stepper motor disconnected. Measure resistance between ST stepper motor terminals ACOMM and BCOMM. Measure resistance between ST stepper motor terminals ACOMM/BCOMM and motor housing. If either resistance measurement is 10,000 ohms or less, replace ST stepper motor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If all resistance measurements are 10,000 ohms or more and DTC P1220 is present, go to next step. If DTC P1220 is not present, check brake system mechanical components for malfunction and repair as necessary.
19. Step 25) Check ST Stepper Motor Circuit Continuity Leave ignition off and ST stepper motor disconnected. Disconnect Series Throttle Controller (STC). Measure resistance of each circuit between ST stepper motor connector and STC connector. If any resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If all resistance measurements are less than 5 ohms, go to next step.
20. Step 26) Check ST Stepper Motor Circuit For Short Leave ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance of each terminal of ST stepper motor connector and all other terminals of ST stepper motor connector. Measure resistance of each terminal of ST stepper motor connector and negative battery terminals. If all resistance measurements are 10,000 ohms or more, go to next step. If any resistance measurements is 10,000 ohms or less, go to next step.
21. Step 27) Check Circuit Voltage To STC Leave STC disconnected. Turn ignition on. Measure voltage between VPWR terminal of STC connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
22. Step 28) Turn ignition off. Leave STC disconnected. Measure resistance between SIG RTN terminal of STC connector and chassis ground. Measure resistance between PWR GND terminal of STC connector and chassis ground. If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurements are 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
23. Step 29) Leave ignition off and STC disconnected. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 18 (TAPW) and TAPW terminal of STC wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TAPW circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
24. Step 30) Leave STC disconnected. Measure voltage between test pin No. 18 and negative battery terminal. If voltage is less than.05 volt, go to next step. If voltage is.05 volt or more, repair TAPW circuit short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
25. Step 31) Turn ignition off. Leave STC disconnected. Measure resistance between test pin No. 18 (TAPW) and test pins No. 51, 91 and 103 at the breakout box. If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or more and DTC P1220 is present, go to next step. If resistance 10,000 ohms or more and DTC P1220 is not present, fault intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z. NOTE: On every power-up, the series throttle is commanded to self-test from the PCM. To verify this signal, go to next step.
26. Step 32) Leave ignition off and STC disconnected. Connect DVOM between test pin No. 18 (TAPW) and 91 (SIG RTN) at the breakout box. While observing DVOM, turn ignition on. If DVOM indicates a brief change of voltage (2.0 volt minimum) as ignition is turned on, replace STC and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If DVOM does not indicate a brief change of voltage, replace PCM and repeat QUICK TEST.
27. Step 33) Leave ignition on. Disconnect TP-B sensor wiring harness connector. Measure voltage between connector terminals SIG RTN (Gray/Red wire) and VREF (Brown/White wire). If voltage is 4-6 volts, replace TP-B and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 4-6 volts, see procedures under CIRCUIT TEST C. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 33) to step 40). No test procedures have been omitted.
28. Step 40) DTC P1224: Check ST Assembly This DTC should be disregarded if any other DTCs are present. DTC P1224 indicates TP-B voltage was out of range during self-test. Possible causes are as follows: TP-B sensor binding or sticking. Throttle stop screw misadjusted. Faulty TP-B. Faulty ST. Check throttle linkage for binding or sticking. Repair if necessary. If throttle linkage is okay, go to next step.
29. Step 41) Turn ignition off. Disconnect air tube from ST assembly. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access TPB PID. While observing PID voltage, push throttle plate shut and then release. Throttle plate should not bind or stick. If TPB-PID is 0.3-0.9 volt at wide open throttle, go to next step. If TPB-PID is not 0.3-0.9 volt at wide open throttle, check ST stepper motor and TP-B for damage. If no damage is present, replace TP-B and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
30. Step 42) Turn ignition off. Disconnect TP-B wiring harness connector. Inspect connector for damage and repair if necessary. Turn ignition on. Measure voltage between SIG RTN and VREF terminal of TP-B wiring harness connector. If voltage is 4-6 volts, replace TP-B and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 4-6 volts, go to CIRCUIT TEST C.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Accelerator linkage.
2. Air cleaner assembly.
3. Air inlet tube.
4. Clean air tube and resonator.
5. Throttle body assembly.
6. IMRC actuator assembly.
7. Intake Manifold Runner Control (IMRC) assembly.
8. Wiring harness circuits (IMRC, IMRC MONITOR, SIG RTN, PWR GND and VPWR).
9. Powertrain Control Module (PCM).

Air Intake Circuit & Components Schematic. Scheme 45

IMRC Connector Terminals. Scheme 46

1. Step 1) Confirm Drive Symptom Test drive vehicle. Check for any of the following symptoms: Accelerator pedal sticking or binding. Hard start/long cranking. Hesitation or stalls at idle. Rough idle. Lack of power. If symptom is present, go to next step. If symptom is not present, fault cannot be duplicated or identified at this time and testing is complete.
2. Step 2) Check Accelerator Linkage If linkage sticks, binds or grabs, go to next step. If linkage operation is okay, go to step 7).
3. Step 3) Turn ignition off. Disconnect accelerator linkage from throttle body. Inspect cable for freedom of travel from accelerator pedal to throttle body linkage cable connector. If cable moves freely, go to next step. If cable does not move freely, repair or replace as necessary.
4. Step 4) Check Throttle Return Screw Leave ignition off and accelerator linkage disconnected from throttle body. Remove clean air tube from throttle body. Inspect clean air tube for dirt or contamination and repair as necessary. Check throttle return screw. If throttle return screw is in contact with throttle linkage lever arm when throttle is fully closed, go to step 6). If throttle screw is not as specified, place a .002" (.05 mm) feeler gauge between throttle return screw and lever arm. Turn screw until it contacts feeler gauge. Remove feeler gauge. Turn throttle adjust screw 1/2 turn clockwise and go to next step.
5. Step 5) Check TP Sensor Range Turn ignition off. Connect scan tester to DLC.Turn ignition on. Using scan tester, access TP PID. While observing TP PID, slowly move throttle from closed to open position. TP PID reading changes should be smooth while rotating throttle. At closed position, TP PID reading should be 0.66-1.20 volts (13-24%). If TP PID is as specified, remove scan tester and go to next step. If TP PID is not as specified, replace throttle body assembly.
6. Step 6) Check Throttle Body Turn ignition off. Disconnect cable from throttle body. Remove clean air tube. Snap throttle from wide open to closed position several times. Slowly cycle throttle from closed to wide open position. Check for freedom of travel especially during initial throttle opening. If throttle moves freely, fault cannot be duplicated or identified at this time and testing is complete. If throttle does not rotate freely, go to next step.
7. Step 7) Check Air Filter Check air filter and element. Clean or replace as necessary. If air filter and element are okay, go to next step.
8. Step 8) Check Engine Operation Ensure that the following engine systems are in good operating condition before continuing: Engine cooling system. Exhaust system. Fuel pressure. PCV system. If systems are operating correctly, go to next step. If systems are not operating correctly, go to CIRCUIT TEST indicated: Exhaust system; CIRCUIT TEST HF. Fuel pressure; CIRCUIT TEST HC. PCV system; CIRCUIT TEST HG. Engine cooling system; repair as necessary.
9. Step 9) Check For Vacuum Leaks Start engine and allow to idle. Inspect inlet air system from MAF sensor to intake manifold for cracks, loose connections or faulty gaskets. Inspect intake manifold, EGR diaphragm and vacuum hoses for leaks. Repair or replace as necessary. If no faults are found, go to next step.
10. Step 10) Check Idle Speed Turn all accessories off. Start engine and warm to normal operating temperature. Connect scan tester to DLC. Using scan tester, access IAC PID, idle air percent duty cycle. IAC PID reading should be approximately 20-45 percent at idle speed. If IAC PID values are correct, go to next step. If IAC PID values are not correct, go to step 12).
11. Step 11) Check Idle Control Pressure Leave accessories off. With engine operating at idle, goose throttle and return to idle position. If engine stalls or engine speed fluctuates excessively before returning to idle, go to next step. If engine does not stall or fluctuate, air intake system is okay and testing is complete.
12. Step 12) Check IAC Solenoid Function Leave accessories off. With engine operating at idle, disconnect IAC solenoid wiring harness connector. If engine speed does not change, replace IAC solenoid and clear Keep Alive Memory (KAM). If engine speed changes, proceed as follows: For vehicles without fast idle symptom, go to next step. For vehicles with fast idle symptom, go to step 14).
13. Step 13) Check Throttle Body Turn ignition off. Remove throttle body. With throttle fully closed, ensure light cannot be seen between throttle bore and plate. Snap throttle from wide open to closed position several times. Slowly cycle throttle from closed to wide open position. Check for freedom of travel especially during initial throttle opening. If throttle body is okay, fault cannot be duplicated or identified at this time and testing is complete. If faults are present, replace throttle body and clear Keep Alive Memory (KAM).
14. Step 14) Check IAC Circuit For Short To Ground Leave accessories off and IAC solenoid disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 83 (IAC) and test pins No. 51 and 103 (PWR GND) at the breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.
15. Step 15) DTC P1512, P1513, P1516, P1517, P1518, P1519, P1520, P1537 & P1538 DTCs P1516 and P1517 indicate control circuit failure. DTCs P1518, P1537 and P1538 indicate IMRC stuck open. DTCs P1512, P1513 and P1519 indicate IMRC stuck closed. DTC P1520 indicates control circuit failure. Possible causes are as follows: Cables improperly routed, binding or seized. Damaged or disconnected IMRC housing return springs. Lever return stop obstructed or bent. Lever wide open stop obstructed or bent. IMRC actuator cable or gears seized. Visually inspect IMRC cables for correct routing. Ensure cable core wire has slack at IMRC housing and stop screw contacts plate. If adjustment is required, see INTAKE MANIFOLD RUNNER CONTROL (IMRC) in «ADJUSTMENTS - 4.9L»(ref-23631) article. Operate IMRC plates while checking for binding or sticking. If any faults are found, repair as necessary. If no faults are found, go to next step.
16. Step 16) Check IMRC Function If IMRC is vacuum controlled, start engine and allow to idle for 20 seconds. Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). Turn all outputs on. When IMRC is turned on, both levers should contact wide open stop. One or both levers should contact wide open stop (one lever being slightly off is acceptable). IRMC levers should cycle fully from closed to open position. If faults are present, go to next step. If no faults are present with DTC P1518, go to step 26). If no faults are present proceed as follows: With DTC P1512 and/or P1513, go to step 41). With DTC P1516 and/or P1517, go to step 64). With DTC P1518, go to step 26). With DTC P1519, go to step 29). With DTC P1520, go to step 19). With DTC P1537 and/or P1538, go to step 52). If DTC P1520 is present, service first before servicing other DTCs.
17. Step 17) Check IMRC Operation Start engine and allow to idle. Apply parking brake. Raise engine speed to more than 3500 RPM. When engine speed exceeds 3500 RPM, one or both levers should contact wide open stop (one lever being slightly off is acceptable). When engine speed drops to less than 3000 RPM, one or both levers should contact closed plate stop screw. If levers do not cycle, go to next step. If levers cycle as specified, proceed as follows: With DTC P1512 and/or P1513, go to step 41). With DTC P1516 and/or P1517, go to step 64). With DTC P1518, go to step 26). With DTC P1519, go to step 29). With DTC P1520, go to step 19). With DTC P1537 and/or P1538, go to step 52). If DTC P1520 is present, service first before servicing other DTCs.
18. Step 18) Turn ignition off. Disconnect cables from IMRC assembly. Operate both levers while checking for binding or sticking. If any faults are found, repair as necessary. If no faults are found, proceed as follows: With DTC P1512 and/or P1513, go to step 41). With DTC P1516 and/or P1517, go to step 64). With DTC P1518, go to step 26). With DTC P1519, go to step 29). With DTC P1520, go to step 19). With DTC P1537 and/or P1538, go to step 52). If DTC P1520 is present, service first before servicing other DTCs.
19. Step 19) DTC P1520 DTC P1520 indicates control circuit failure. Possible causes are as follows: IMRC control circuit open or shorted to PWR GND or SIG RTN. VREF circuit open or shorted to IMRC control circuit. Faulty IMRC module. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access IMRCF PID. If IMRCF PID display is on, go to next step. If IMRCF PID display is not on, go to step 36).
20. Step 20) Check IMRC Voltage Turn ignition off. Disconnect IMRC module wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at IMRC wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
21. Step 21) Measure voltage between PWR GND terminal and VPWR terminal at IMRC wiring harness connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in PWR GND circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
22. Step 22) Check IMRC Circuit Driver For Short To Ground Turn ignition off. Measure resistance between IMRC terminal at wiring harness connector and negative battery terminal. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, go to step 39).
23. Step 23) Check IMRC Circuit Driver For Short To Ground Leave ignition off and IMRC module disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure voltage between IMRC test pin and test pins No. 51 and 103 (PWR GND) at breakout box. If each measurement is one volt or more, go to next step. If either measurement is less than one volt, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . IMRC TEST PIN IDENTIFICATION Application Test Pin No. All Models 42
24. Step 24) Check IMRC Circuit Driver For Open Circuit Leave ignition off and IMRC module disconnected. Measure resistance between IMRC test at breakout box and IMRC terminal at wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
25. Step 25) Verify PCM IMRC Driver Reconnect IMRC module. Turn ignition on. Connect jumper wire between IMRC test pin and test pin No. 51 and 103 at breakout box. If IMRC plates open, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If IMRC plates do not open, replace IMRC module and repeat QUICK TEST.
26. Step 26) DTC P1518: Check IMRC MONITOR Circuit DTC P1518 indicates low circuit voltage. Possible causes are as follows: IMRC control circuit shorted. Faulty IMRC module. Faulty Powertrain Control Module (PCM). Ensure IMRC plates are closed. If IMRC plates are open, go to step 20). Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access IMRCM PID. If PID voltage is 1.6 volts or more, go to step 34). If PID voltage is less than 1.6 volts, go to next step.
27. Step 27) Turn ignition off. Disconnect IMRC module wiring harness connector. Turn ignition on. Using scan tester, access IMRCM PID. If PID voltage is 1.6 volts or more of what PID was with IMRC module disconnected, replace IMRC module. If PID voltage is less than 1.6 volts of what PID was with IMRC module disconnected, go to next step.
28. Step 28) Turn ignition off. Leave IMRC module disconnected. Measure resistance between IMRC terminal at wiring harness connector and negative battery terminal. If resistance is 10,000 ohms or more, replace PCM. If resistance is less than 10,000 ohms, repair short in IMRCM circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
29. Step 29) DTC P1519 DTC P1519 indicates IMRC input is greater than expected. Possible causes are as follows: IMRC circuit open. IMRC circuit shorted to ground or VREF. SIG RTN circuit open. Faulty IMRC module. Faulty Powertrain Control Module (PCM). If DTC P1520 is present, service before continuing. Leave ignition off and IMRC wiring harness connector disconnected. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Connect jumper wire between IMRC wiring harness connector terminals IMRCM and SIG RTN. Using scan tester, access IMRCM PID. If IMRCM PID voltage is 0.2 volt or less, go to step 40). If IMRCM PID voltage is more than 0.2 volt, remove jumper wire and go to next step.
30. Step 30) Turn ignition off. Leave IMRC module disconnected. Measure resistance between SIG RTN terminal at IMRC wiring harness connector and negative battery terminal. If resistance is less than 55 ohms, go to next step. If resistance is more than 55 ohms, repair open in SIG RTN circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
31. Step 31) Check IMRCM Circuit Continuity Leave ignition off and IMRC module disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 8 (IMRCM) and IMRCM terminal at wiring harness connector. If resistance is less than 5 ohms, replace PCM and go to step 33). If resistance is 5 ohms or more, repair open in IMRCM circuit and go to step 33).
32. Step 32) DTC P1519: Check Circuit Operation Turn ignition off. Reconnect all components. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). While in OTM, access IMRCM PID and IMRC PID voltage. Connect DVOM between test pin No. 8 and test pins No. 51 and 103. If PID voltage and DVOM voltage are less than 1.6 volts, go to step 34). If either voltage is more than 1.6 volts, replace IMRC module and go to next step.
33. Step 33) IMRC Drive Cycle Clear PCM memory. Using scan tester, access IMRC PID, IMRCM PID and RPM PID. Test drive vehicle with transmission in Overdrive. Complete 3 cycles from complete stop to speed requiring engine speed in excess of 3500 RPM. Stop vehicle. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) and retrieve all DTCs. If DTC 1519 is still present return to step 29). If any other DTCs are present, service as necessary. If no other DTCs are present, testing is complete.
34. Step 34) Wiggle Test Turn ignition off. Disconnect IMRC module. Connect jumper wire between IMRC wiring harness connector terminals IMRCM and SIG RTN. Turn ignition on. Using scan tester, access IMRCM PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage from less than 0.2 volt to more than 1.6 volts. Wiggle wiring harness between IMRC connector and PCM connector. If fault is indicated, isolate and repair as necessary. If no faults are indicated, remove jumper wire and go to next step.
35. Step 35) Leave IMRC module disconnected. Turn ignition on. Using scan tester, access IMRCM PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage to more than 1.6 volt. Wiggle wiring harness between IMRC connector and PCM connector. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.
36. Step 36) Continuous Memory DTC P1520: Intermittent Circuit Malfunction Turn ignition off. Reconnect all components. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). While in OTM, access IMRCM PID and IMRC PID. Connect DVOM between test IRMC test pin and test pins No. 51 and 103. Command outputs on. Observe PID for signs of fault. A fault will be indicated by sudden change in PID voltage. Wiggle wiring harness between IMRC connector and PCM connector. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to next step.
37. Step 37) Turn ignition on. While observing IMRC plates, wiggle wiring harness between IMRC module and PCM connector. If IMRC plates open while wiggling harness, fault is indicated. Isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.
38. Step 38) Leave ignition off and IMRC disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 8 (IMRCM) and 90 (VREF) at breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 10,000 ohms, repair short between IMRCM and VREF circuit.
39. Step 39) Leave ignition off and IMRC disconnected. Measure resistance between IMRC test pin and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 10,000 ohms, repair short to ground in PWR GND in IMRC control circuit.
40. Step 40) Check IMRC Circuit Turn ignition off. Reconnect all components. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). While in OTM, turn all outputs on. Observe IMRC levers. If levers cycle open during output command, go to step 32). If levers do not cycle open during output command, go to step 20).
41. Step 41) Check IMRC Actuator DTC P1512, P1513, P1516 and P1517 indicates IMRC plates are stuck open. Possible causes are as follows: Broken or restricted vacuum hoses. IMRC circuit open. IMRC circuit shorted to ground or VREF. SIG RTN circuit open. Faulty IMRC module. Faulty Powertrain Control Module (PCM). For vacuum operated systems, start engine and allow to idle for 20 seconds. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access IMRCM PID and IMRC2M PID. Manually rotate IMRC levers. If PID voltage is 3.0 volts or more as levers are rotated, go to step 47). If PID voltage is not as specified, go to next step.
42. Step 42) Check IMRC Monitor Signal For vacuum operated systems, start engine and allow to idle for 20 seconds. With scan tester connected to DLC, turn ignition on. Using scan tester, access IMRCM PID and IMRC2M PID. Disconnect both IMRC actuator wiring harness connectors. Using jumper wire, connect IMRCM and IMRC2M connector terminals to ground. If PID voltage change is less than 1.0 volt, go to next step. If PID voltage change is 1.0 volt or more, go to step 44).
43. Step 43) Turn ignition off. Leave both IMRC actuator wiring harness connectors disconnected. Measure resistance between IMRC terminal and PWR GND terminal at actuator. Measure resistance between IMRC terminal and VPWR terminal at actuator. If resistance is not 100-10,000 ohms, replace IMRC actuator and go to step 33). If resistance is 100-10,000 ohms, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.
44. Step 44) Leave ignition off and both IMRC actuator wiring harness connectors disconnected. Measure resistance between PWR GND terminal at actuator and chassis ground. If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, repair open circuit go to step 33).
45. Step 45) Leave ignition off and both IMRC actuator wiring harness connectors disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Connect negative lead of DVOM to test pin No. 77 or 104 (PWR GND) at breakout box. Check voltage at test pin No. 8. and 9. If voltage is less than 1.0 volt, go to next step. If voltage is 1.0 volt or more, repair circuit short to VPWR and go to step 33).
46. Step 46) Turn ignition off. Leave both IMRC actuator wiring harness connectors disconnected. Measure resistance between IMRCM terminal at actuator and test pin No. 8 and 9. If resistance is less than 5 ohms, replace PCM and go to step 33). If resistance is 5 ohms or more, repair open in IMRCM circuit and go to step 33).
47. Step 47) Connect scan tester to DLC. Turn ignition on. Using scan tester, access IMRCM PID and IMRC2M PID. Observe PID values. Start engine and allow to idle. Access IMRCM PID and IMRC2M PID. If PID values change, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z. If PID values do not change, go to next step.
48. Step 48) Turn ignition off. Disconnect left IMRC actuator vacuum hose. Ensure hose is not damaged or restricted. Connect vacuum hose to vacuum gauge. Start engine and allow to idle. If vacuum reading is less than 10 in. Hg, go to next step. If vacuum reading is 10 in. Hg or more, replace IMRC actuator and go to step 33).
49. Step 49) Turn ignition off. Disconnect right IMRC actuator vacuum hose. Ensure hose is not damaged or restricted. Connect vacuum hose to vacuum gauge. Start engine and allow to idle. If vacuum reading is less than 10 in. Hg, go to next step. If vacuum reading is 10 in. Hg or more, replace IMRC actuator and go to step 33).
50. Step 50) Check IMRC Circuit To PCM Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 42 and test pins 77 and 103 at breakout box. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair IMRCM circuit short to PWR GND and go to step 33).
51. Step 51) Check IMRC Circuit For Short Turn ignition off. Connect PCM to breakout box. With vacuum gauge connected to IMRC actuator vacuum hose, start engine and allow to idle. Connect jumper wire between test pin No. 42 and test pin 77 or 103 (PWR GND) at breakout box. If vacuum reading is less than 10 in. Hg, replace PCM and go to step 33). If vacuum reading is 10 in. Hg or more, replace IMRC actuator and go to step 33).
52. Step 52) Check IMRC Actuator DTC P1516, P1517, P1537 and P1538 indicates IMRC plates are stuck open. Possible causes are as follows: Broken or restricted vacuum hoses. IMRC circuit open. IMRC circuit shorted to ground or VREF. SIG RTN circuit open. Faulty IMRC module. Faulty Powertrain Control Module (PCM). For vacuum operated systems, start engine and allow to idle for 20 seconds. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access IMRCM PID. Access IMRC2M PID. If PID voltage is less than 1.0 volt, go to next step. If PID voltage is 1.0 volts or more, fault is intermittent. Go to step 54).
53. Step 53) Check IMRC PID Reading For vacuum operated systems, start engine and allow to idle for 20 seconds. With ignition on, use scan tester to access IMRCM PID. Access IMRC2M PID. Proceed as follows: Disconnect left IMRC actuator connector and note PID voltage. Disconnect right IMRC actuator connector and note PID voltage. Reconnect right IMRC actuator connector and note PID voltage. Reconnect left IMRC actuator connector and note PID voltage. If PID values increase is 1.0 volt or more, isolate and replace defective IMRC actuator. Go to step 33). If PID values do not increase more than 1.0 volt, go to step 55).
54. Step 54) Wiggle Test For vacuum operated systems, start engine and allow to idle for 20 seconds. After about 30 seconds, vacuum will bleed off and PID values will change. Restart engine if necessary. With ignition on, use scan tester to access IMRCM PID. Access IMRC2M PID. Turn ignition to ON position. Wiggle IMRC wiring harness between actuator and PCM. Observe PID for signs of fault. A fault will be indicated by a sudden drop in PID voltage. Wiggle wiring harness between IMRC connector and PCM connector. If fault is indicated, isolate and repair as necessary. Go to step 33). If no faults are indicated, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.
55. Step 55) Check IMRC Vacuum Supply Turn ignition off. Disconnect IMRC actuator vacuum hose. Ensure hose is not damaged or restricted. Connect vacuum hose to vacuum gauge. Start engine and allow to idle. If vacuum reading is more than 10 in. Hg, go to next step. If vacuum reading is 10 in. Hg or less, replace IMRC actuator and go to step 33).
56. Step 56) Turn ignition off. Disconnect left IMRC actuator vacuum hose. Ensure hose is not damaged or restricted. Connect vacuum hose to vacuum gauge. Start engine and allow to idle. If vacuum reading is less than 10 in. Hg, go to next step. If vacuum reading is 10 in. Hg or more, go to step 60).
57. Step 57) Check VPWR Circuit Turn ignition off. Disconnect IMRC actuator wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open circuit and go to step 33).
58. Step 58) Check IMRC Circuit For Open Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 42 at breakout box and IMRC terminal at actuator wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in IMRCM circuit and go to step 33).
59. Step 59) Check IMRC Circuit To PCM Turn ignition on. Measure voltage between test pin No. 42 and test pins 77 and 103 at breakout box. If voltage is 10.5 volts or more, repair IMRC circuit short to VREF or VPWR. If voltage is less than 10.5 volts, replace IMRC vacuum actuator. Go to step 33).
60. Step 60) Check VPWR Circuit Turn ignition off. Disconnect both IMRC sensor wiring harness connectors. Turn ignition on. Measure voltage between VPWR terminal of connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit and go to step 33).
61. Step 61) IMRCM Circuit Check For Short To Ground Turn ignition off. Leave both IMRC sensor wiring harness connectors disconnected. Disconnect scan tester from DLC. Measure resistance between IMRCM terminal at both connectors and chassis ground. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, go to step 63).
62. Step 62) IMRC Sensor Check Leave ignition off and both IMRC sensor wiring harness connectors disconnected. Measure resistance between IMRC terminal and PWR GND terminal at both sensors. If resistance is not 1000-20,000 ohms, replace IMRC sensor and, go to step 33). If resistance is 1000-20,000 ohms, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z.
63. Step 63) Check PCM For Internal Short Leave ignition off and both IMRC sensor wiring harness connectors disconnected. Measure resistance between test pin No. 8 and test pins 77 and 103 at breakout box. If resistance is 10,000 ohms or more, replace PCM and go to step 33). If resistance is less than 10,000 ohms, repair circuit short to PWR GND and go to step 33).
64. Step 64) Determine IMRC Fault Path DTC P1516 or P1517 indicate IMRC plates are open or closed time exceeded PCM program. For vacuum operated systems, start engine and allow to idle for 20 seconds. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access IMRCM PID. Access IMRC2M PID. If PID voltage is less than 3.0 volts, go to step 26) for electronic controlled systems or step 55) for vacuum controlled systems. If PID voltage is 3.0 volts or more, go to step 29) for electronic controlled systems or step 41) for vacuum controlled systems.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Leaks in fuel tank, filler cap or vapor hoses.
2. Wiring harness circuits (CANP SIG, PF, PWR GND, VMV and VPWR).
3. Faulty Canister Purge (CANP) solenoid.
4. Faulty Purge Flow Sensor (PFS).
5. Faulty Vapor Management Valve (VMV).
6. Faulty carbon canister.
7. Faulty PCM.

EVAP Components Using Purge Flow System. Scheme 47

EVAP Components Using Vapor Management System. Scheme 48

VMV Test Circuit & Connector Terminals. Scheme 49

Scheme 50

Scheme 51

1. Step 1) DTC P0443: Check VPWR Circuit Voltage Disconnect Canister Purge (CANP) solenoid or Vapor Management Valve (VMV) wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of CANP solenoid or VMV wiring harness connector and battery ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
2. Step 2) Check Component Resistance Turn ignition off. Leave CANP or VMV wiring harness connector disconnected. Measure resistance between CANP solenoid or VMV terminals. For CANP solenoid, if resistance is 30-90 ohms, go to next step. For VMV, if resistance is 30-36 ohms, go to step 4). If resistance is not as specified, replace CANP solenoid or VMV. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
3. Step 3) Check CANP Solenoid For Internal Short Turn ignition off. Leave wiring harness connector disconnected. Measure resistance between each solenoid terminal and CANP solenoid housing. If each resistance measurement is more than 90 ohms, CANP solenoid is okay. Go to next step. If resistance is not as specified, replace CANP solenoid. Clear PCM memory, repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
4. Step 4) Check VMV Circuit Continuity Leave ignition off and CANP or VMV wiring harness connector disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance as follows: For CANP solenoid, between test pin No. 67 at breakout box and EVAP CANP terminal of CANP solenoid wiring harness connector. For VMV, between test pin No. 56 at breakout box and VMV terminal of VMV wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
5. Step 5) Check Circuit For Short To PWR GND Leave ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 67 (CANP solenoid) or 56 (VMV) and test pins No. 24 and 103. If each resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, repair EVAP CANP/VMV circuit short to PWR GND circuit. Clear PCM memory and repeat QUICK TEST.
6. Step 6) Continuous Memory DTC P1443 This DTC can set by Idle Air Control (IAC) valve speed error during vehicle operation. If Continuous Memory DTC P1507 is also present, go to CIRCUIT TEST KE, step 30). Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access IAC PID, TP PID and RPM PID. Turn all accessories off. Start engine and allow to idle. IAC duty cycle should be 20-45%. Observe IAC PID and RPM PID for indication of fault while shaking and bending IAC valve wiring harness and connector. A fault will be indicated by sudden increase of engine speed and decrease in IAC duty cycle. If fault indicated, isolate/repair as necessary. If no fault go to step 10).
7. Step 7) Check Purge Flow Sensor (PFS) Connect scan tester to Data Link Connector (DLC). Start engine and allow to idle. Disconnect PFS wiring harness connector. Inspect connector for damage and repair if necessary. Using scan tester, access PF PID. If voltage fluctuates about 0.9-1.1 volts, go to step 11). If voltage fluctuates 2.3-2.6 volts, go to step 12). If voltage does not fluctuate as specified, go to next step.
8. Step 8) Check PFS Resistance Turn ignition off. Ensure PFS is about 55-80°F. Measure resistance between PF terminal and VPWR terminal at sensor. Resistance should be less than 160 ohms. Measure resistance between PWR GND terminal and VPWR terminal at sensor. Resistance should be less than 190 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace PFS and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
9. Step 9) Check VPWR Circuit Continuity Leave ignition off and PFS disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pins No. 71 and 97 at breakout box and VPWR terminal at PFS. test pins No. 24 and 103. If each resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in VPWR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
10. Step 10) Check EVAP System Leave ignition off. Ensure fuel fill cap is installed correctly. Check vacuum hose between fuel tank and carbon canister for faults. Check for carbon canister cracks or damage. Check for fuel tank damage. Check for damaged orifice rollover valve. Repair or replace as necessary. If no faults are found on models equipped with CANP solenoid, go to next step. If no faults are found on models equipped with VMV, go to step 18).
11. Step 11) Check CANP Solenoid For Vacuum Leak Leave ignition off. Disconnect CANP solenoid wiring harness connector. Disconnect hoses from CANP solenoid. Connect vacuum pump to intake manifold side of CANP solenoid. Using vacuum pump, apply 16 in. Hg to solenoid. If vacuum is held for 20 seconds, leave pump connected and go to next step. If vacuum is not held for 20 seconds, replace CANP solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 12) Leave ignition off and CANP solenoid wiring harness connector disconnected. Connect scan tester to DLC. Turn ignition on. Using scan tester, access Output Test Mode and command CANP solenoid on. Using vacuum pump, apply 16 in. Hg to solenoid. When CANP solenoid is commanded on, vacuum should be released. If solenoid does not operates as specified, replace CANP solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If solenoid operates as specified, check fuel vapor hoses between carbon canister and CANP solenoid for damage or restriction. Repair as necessary. If no faults are found, go to next step.
13. Step 13) Check For Vacuum To CANP Solenoid Start engine and allow to idle. Check open end of solenoid hose for vacuum. If vacuum is present, leave hose disconnected and go to next step. If vacuum is not present, check vacuum hoses for incorrect routing, cracks or restrictions. Ensure Purge Flow Sensor (PFS) housing is not cracked or damaged. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
14. Step 14) Check Purge Flow Sensor (PFS) Leak Down Turn ignition off. Disconnect PFS wiring harness connector. Plug open end of manifold vacuum hose. Disconnect PFS manifold vacuum hose at manifold. With vacuum pump connected to intake manifold side of CANP solenoid, apply 4 in. Hg to solenoid. If vacuum is held for 2.5 seconds or more, remove vacuum pump and go to next step. If vacuum is not held for 2.5 seconds, replace PFS and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
15. Step 15) Leave PFS wiring harness connector disconnected. Start engine and allow to idle. Check for vacuum at open end of PFS manifold vacuum supply hose. If vacuum is not present, check for small vacuum leak between PFS and intake manifold. If vacuum is present, check for large vacuum leak between PFS and intake manifold. Repair as necessary. If DTC P1443 is present, go to next step.
16. Step 16) Check Component Resistance Turn ignition off. Leave CANP or VMV wiring harness connector disconnected. Measure resistance between CANP solenoid or VMV terminals. For CANP solenoid, resistance should be 30-90 ohms. For VMV, resistance should be 30-36 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace CANP solenoid or VMV. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
17. Step 17) Check Circuit For Short To PWR GND Leave ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 67 (CANP solenoid) or 56 (VMV) and test pins No. 24 and 103 at breakout box. If each resistance more than 10,000 ohms, replace PCM, repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 10,000 ohms or less, repair EVAP CANP/VMV circuit short to PWR GND circuit. Clear PCM memory and repeat QUICK TEST.
18. Step 18) Check VMV Turn ignition off. Reconnect VMV wiring harness connector. Disconnect VMV fuel vapor hose from intake manifold port at VMV. Attach vacuum pump with gauge to intake manifold port at VMV. Using vacuum pump, apply 16 in. Hg to VMV. If vacuum bleeds off immediately, go to next step. If vacuum is not bled off immediately, replace VMV and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). (Scheme 50): VMV Hose Ports
19. Step 19) Check VMV Filter Turn ignition off. Disconnect vacuum input hose from VMV. Using a vacuum pump, apply 15 in. Hg to VMV. If vacuum is held or bleeds off slowly, go to next step. If vacuum is not held, remove vacuum pump and go to next step.
20. Step 20) Check VPWR Circuit Voltage Turn ignition off. Connect PCM to breakout box. Disconnect VMV wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of VMV wiring harness connector and battery ground. If voltage is 10.5 volts or more, go to next step. If voltage less than 10.5 volts, repair open in VPWR circuit, repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
21. Step 21) Check VMV Turn ignition off. Ensure PCM is connected to breakout box. Reconnect VMV vacuum input hose. Disconnect fuel vapor to carbon canister hose. Connect vacuum gauge to vacuum port. Start engine and allow to idle for 5 minutes. Vacuum gauge should read zero. Connect jumper wire between test pin No. 56 (VMV) and test pin No. 51 or 103 at breakout box. Vacuum should be about engine manifold vacuum. If vacuum is not as specified, replace VMV and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vacuum is as specified, remove vacuum gauge and jumper wire. Go to next step.
22. Step 22) Turn ignition off. Disconnect VMV wiring harness connector disconnected. Disconnect upper and lower hose from VMV. Start engine and allow to idle. Check for vacuum at open end of hoses. If vacuum is present, reconnect hoses and go to next step. If vacuum is not present, check hoses for correct routing. Ensure hoses are not damaged or restricted. Repair or replace as necessary.
23. Step 23) Turn ignition off. Ensure VMV wiring harness connector is connected. Disconnect vacuum input hose from VMV. Using a vacuum pump, apply 16 in. Hg to VMV. If vacuum bleeds off immediately, go to step 16). If vacuum is not bled off immediately, check hoses for damage or restriction. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
24. Step 24) Continuous Memory DTC P1444 Turn ignition off. Connect scan tester to Diagnostic Link Connector (DLC). Turn ignition on. Using scan tester, access PF PID. If PF PID voltage is less than 0.14 volt, go to next step. If voltage is 0.14 volt or more, go to step 27).
25. Step 25) Turn ignition off. Disconnect PFS wiring harness connector. Measure resistance between terminal No. 2 and No. 3. (Scheme 51) If resistance is less than 25.5 ohms, replace PFS and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 25.5 ohms or more, go to next step. (Scheme 51): PFS Sensor Connector Terminals
26. Step 26) Check PF Circuit For Short To VPWR Leave ignition off and PFS disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Disconnect scan tester (if applicable). Measure resistance between breakout box test pin No. 11 and test pins No. 24 and 103. If each resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any resistance is 10,000 ohms or less, repair PFS circuit short to PWR GND. Clear PCM memory and repeat QUICK TEST.
27. Step 27) Wiggle Test Solenoid & Harness Turn ignition off. Using scan tester, access PF PID. Observe PF PID for indication of fault while shaking and bending PFS wiring harness and connector. A fault will be indicated by sudden change of voltage. Tap lightly on PFS sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.
28. Step 28) Continuous DTC P1445 Turn ignition off. Connect scan tester to Diagnostic Link Connector (DLC). Turn ignition on. Using scan tester, access PF PID. If PF PID voltage is more than 4.8 volts, go to next step. If voltage is 4.8 volts or more, go to step 34).
29. Step 29) Turn ignition off. Disconnect PFS wiring harness connector. Allow sensor to cool to room temperature. Measure resistance between terminal No. 1 and No. 2. (Scheme 51) If resistance is 40-230 ohms, go to next step. If resistance is not 40-230 ohms, replace PFS sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
30. Step 30) Check PFS Circuit Short To VPWR Leave PFS sensor disconnected. Turn ignition on. Measure voltage between PF terminal of sensor wiring harness connector and battery ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 32).
31. Step 31) Turn ignition off. Leave PFS sensor disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between breakout box test pin No. 11 and test pins No. 24 and 103. If voltage is greater than 10.5 volts, repair PFS circuit short to VPWR and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is 10.5 volts or less, replace PCM and repeat QUICK TEST.
32. Step 32) Turn ignition off. Leave PFS sensor disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 11 and PF terminal at sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PF circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
33. Step 33) Leave ignition off and PFS sensor disconnected. Measure resistance between breakout box test pins No. 24 and 103. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open in PWR GND circuit and repeat QUICK TEST.
34. Step 34) Wiggle Test Solenoid & Harness Turn ignition off. Connect scan tester to DLC. Using scan tester, access PF PID. Observe PF PID for indication of fault while shaking and bending PFS wiring harness and connector. A fault will be indicated by sudden change of voltage. Tap lightly on PFS sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.
35. Step 35) Continuous Memory DTC P0443: Check VMV Circuit For Intermittent Failure Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If Continuous Memory DTC P0443 is still present, go to next step. If Continuous Memory DTC P0443 is not present, go to step 1).
36. Step 36) Wiggle Test Solenoid & Harness Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Using DVOM, measure resistance between test pin No. 67 (CANP solenoid) or 56 (VMV) and test pins No. 71 and 97. Observe DVOM for indication of fault while shaking and bending VMV wiring harness and connector. A fault will be indicated by resistance measurement of less than 30 ohms or more than 36 ohms (VMV) or 90 ohms (CANP solenoid). Tap lightly on VMV to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Leaks in fuel tank, filler cap or vapor hoses.
2. Faulty Canister Vent (CV) solenoid.
3. Faulty Fuel Tank Pressure (FTP) Sensor.
4. Faulty fuel vapor valve.
5. Faulty fuel vapor control valve (if equipped).
6. Faulty carbon canister.
7. Wiring harness circuits (CV, FTP, PWR GND, VMV, VPWR and VREF).
8. Faulty PCM.

EVAP Components. Scheme 52

CV Solenoid Connector & Test Circuit. Scheme 53

FTP Connector & Test Circuit. Scheme 54

VMV Connector & Test Circuit. Scheme 55

1. Step 1) Continuous Memory DTC P0442 Or P1442 Turn ignition off. Ensure fuel fill cap is correctly installed. Ensure cap is not damaged or excessively worn. Service or replace as necessary and verify symptom is repaired. If fuel fill cap is okay, go to next step.
2. Step 2) Leave ignition off. Check all fuel vapor hoses for damage or restrictions. Ensure hose connections are tight. Service or replace as necessary and verify symptom is repaired. If fuel vapor hoses are okay, go to step 61). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 2) to step 6). No test procedures have been omitted.
3. Step 6) Continuous Memory DTC P0443 Perform «QUICK TEST»(ref-23594-S34023665322001010300000) . If DTC P0443 is present in Continuous Memory only, go to step 12). If DTC P0443 is present in KOEO or «KOER SELF-TEST»(ref-23594-S04533554802001010300000) , go to next step.
4. Step 7) DTC P0443: Check VPWR Circuit Voltage Turn ignition off. Disconnect Vapor Management Valve (VMV) wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of VMV wiring harness connector and battery ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 8) Check VMV Resistance Turn ignition off. Leave VMV wiring harness connector disconnected. Measure resistance between CANP solenoid or VMV terminals. If resistance is 30-36 ohms, go to next step. If resistance is not as specified, replace VMV and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 9) Check VMV Circuit Continuity Leave ignition off and VMV wiring harness connector disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 56 at breakout box and VMV terminal of VMV wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
7. Step 10) Check Circuit For Short To PWR GND Leave ignition off and VMV wiring harness connector disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 56 (VMV) and test pins No. 24 and 103. If each resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair VMV circuit short to PWR GND circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 11) Leave ignition off and VMV disconnected. Turn ignition on. Measure voltage between breakout box test pin No. 56 and test pins No. 51 and 103. If voltage is greater than 10.5 volts, repair VMV circuit short to VPWR and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 10.5 volts or less, replace PCM and repeat QUICK TEST.
9. Step 12) Wiggle Test VMV & Harness Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Using DVOM, measure resistance between test pin No. 56 (VMV) and test pins No. 71 and 97. Observe DVOM for indication of fault while shaking and bending VMV wiring harness and connector. A fault will be indicated by resistance measurement of less than 30 ohms or more than 36 ohms. Tap lightly on VMV to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, see CIRCUIT TEST Z.
10. Step 13) Continuous Memory DTC P0446 Turn ignition off. Remove fuel fill cap. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FTP V PID. Record FTP T PID voltage. Install fuel fill cap to first click. If FTP T PID voltage is 2.37-2.87 volts, go to step 15). If FTP T PID voltage is not 2.37-2.87 volts, go to next step.
11. Step 14) Check VREF At FTP Connector Turn ignition off. Disconnect FTP wiring harness connector. Turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at wiring harness connector. If voltage is 4-6 volts, replace FTP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is not 4-6 volts, go to CIRCUIT TEST C.
12. Step 15) Check Carbon Canister Check for restrictions at carbon canister atmosphere vent port. Check for restrictions in purge air inlet tube (large diameter hose) between CV solenoid and atmosphere. Repair or replace as necessary. If no faults are found, go to next step.
13. Step 16) Check CV Solenoid Filter Port Disconnect purge air inlet tube (large diameter hose) from CV solenoid. If vehicle is not equipped with purge air inlet tube, go to next step. Locate opposite end of tube (in fuel filter housing). Drop a 3/8" ball bearing into tube. If ball bearing passes through tube, go to next step. If ball bearing does not pass through tube, service or replace tube as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
14. Step 17) Check CV Solenoid Mechanical Operation Remove CV solenoid hose. Connect vacuum pump to solenoid. Using vacuum pump, apply 16 in. Hg to solenoid. If vacuum is held for one minute, replace solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If vacuum is not held for one minute, go to next step.
15. Step 18) DTC P0446 Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using tester, access EVAPCVF PID. If scan tester indicates YES, go to next step. If scan tester does not indicate YES, go to step 21).
16. Step 19) Check CV Solenoid Resistance Turn ignition off. Disconnect CV solenoid wiring harness connector. Measure resistance between CV and VPWR terminal at solenoid. If resistance is less than 45 ohms, replace CV solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 45 ohms or more, go to next step.
17. Step 20) Check Circuit For Short To PWR GND Leave ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 67 (CV) and test pins No. 51 and 103. If each resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or less, repair CV circuit short to PWR GND circuit. Clear PCM memory and repeat QUICK TEST.
18. Step 21) Wiggle Test CV Solenoid & Harness Turn ignition on. Using scan tester, access EVAPCVF PID. Observe EVAPCVF PID for indication of fault while shaking and bending CV solenoid wiring harness and connector. A fault will be indicated by a change in EVAPCVF PID voltage. Tap lightly on CV solenoid to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.
19. Step 22) DTC P0452 Turn ignition off. Connect scan tester to DLC. Check FTP wiring harness connector for damage or fuel contamination. Repair or replace if necessary. If connector is okay, go to next step.
20. Step 23) Verify FTP Signal Voltage Leave ignition off. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FTP V PID. If FTP V PID is less than 0.22 volts, go to next step. If FTP V PID is 0.22 volts or more, go to step 27).
21. Step 24) Induce Opposite FTP Signal Leave ignition off. Disconnect FTP wiring harness connector. Connect jumper wire between FTP terminal and VREF terminal at connector. Turn ignition on. Using scan tester, access FTP V PID. If scan tester error occurs, go to next step. If FTP V PID is 4-6 volts, replace FTP and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If FTP V PID is not 4-6 volts, remove jumper wire and go to next step.
22. Step 25) Check VREF At FTP Connector Leave ignition off. Disconnect FTP wiring harness connector. Connect jumper wire between FTP terminal and VREF terminal at connector. Turn ignition on. Using scan tester, access FTP V PID. If scan tester error occurs, go to next step. If FTP V PID is 4-6 volts, replace FTP and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If FTP V PID is not 4-6 volts, remove jumper wire and go to next step.
23. Step 26) Check Circuit For Short To PWR GND Or SIG RTN Leave ignition off and FTP disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Disconnect scan tester from DLC. Measure resistance between test pin No. 62 (FTP) and test pins No. 51, 91 and 103. If each resistance more than 10,000 ohms, replace PCM, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or less, repair FTP circuit short to SIG RTN or PWR GND circuit. Clear PCM memory and repeat QUICK TEST.
24. Step 27) Wiggle Test CV Solenoid & Harness Turn ignition on. Using scan tester, access FTP V PID. Observe FTP V PID for indication of fault while shaking and bending FTP sensor wiring harness and connector. A fault will be indicated by a change in FTP V PID voltage. Tap lightly on FTP sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.
25. Step 28) DTC P0453 Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using tester, access FTP V PID. If FTP V PID more than 4.5 volts, go to next step. If FTP V PID 4.5 volts or less, go to step 37).
26. Step 29) Check FTP Signal For Short To Power Leave ignition off. Disconnect FTP wiring harness connector. Turn ignition on. Measure voltage between negative battery terminal and FTP terminal at wiring harness connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 31).
27. Step 30) Check FTP Circuit For Short To VPWR Leave FTP disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 62 (FTP) and test pins No. 51 and 103 at breakout box. If either voltage is less than 10.5 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If all voltages are 10.5 volts or more, repair FTP circuit short to VPWR. Clear PCM memory and repeat QUICK TEST.
28. Step 31) Induce Opposite FTP Signal Turn ignition off. Leave FTP wiring harness connector disconnected. Connect jumper wire between FTP terminal and SIG RTN terminal at connector. Turn ignition on. Using scan tester, access FTP V PID. If scan tester error occurs, go to step 36). If FTP V PID is less than 0.1 volt, go to next step. If FTP V PID is 0.1 volts or more, go to step 34).
29. Step 32) Check VREF At FTP Connector Leave ignition off. Disconnect FTP wiring harness connector. Measure voltage between SIG RTN terminal and VREF terminal at wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
30. Step 33) Check FTP Circuit For Short To VREF Leave ignition off and FTP disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Disconnect scan tester from DLC. Measure resistance between test pins No. 62 (FTP) and 90 (VREF) at breakout box. If resistance is more than 10,000 ohms, replace FTP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or less, repair FTP circuit short to VREF. Clear PCM memory and repeat QUICK TEST.
31. Step 34) Check FTP Circuit Continuity Leave ignition off and FTP disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Disconnect scan tester from DLC. Measure resistance between test pin No. 62 (FTP) and FTP terminal at FTP wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FTP circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
32. Step 35) Check SIG RTN Circuit Continuity Leave ignition off and FTP disconnected. Measure resistance between test pin No. 91 and SIG RTN terminal at FTP wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, repair open in SIG RTN circuit. Clear PCM memory and repeat QUICK TEST.
33. Step 36) Check FTP Circuit For Short To VREF Leave ignition off and FTP disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pins No. 62 (FTP) and 90 (VREF) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or less, repair FTP circuit short to VREF. Clear PCM memory and repeat QUICK TEST.
34. Step 37) Wiggle Test CV Solenoid & Harness Turn ignition on. Using scan tester, access FTP V PID. Observe FTP V PID for indication of fault while shaking and bending FTP sensor wiring harness and connector. A fault will be indicated by a change in FTP V PID voltage. Tap lightly on FTP sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 37) to step 40). No test procedures have been omitted.
35. Step 40) Continuous Memory P0455 Or P1455 Turn ignition off. Ensure fuel fill cap is correctly installed and in good condition. Check carbon canister for damage. Check fuel vapor hoses for correct routing. Check fuel tank and fill pipe for damage. Repair or replace as necessary and go to step 61). If no faults are present, go to next step.
36. Step 41) Check System Pressure Turn ignition off. Remove fuel fill cap. Disconnect and plug fuel vapor hose at VMV. Connect scan tester to DLC. Using scan tester, access Output Test Mode and select All Off mode. Turn ignition on. Using Evaporative Emission System Tester (Rotunda 134 00056), pressurize evaporative system at 14 in. Hg. (if evaporative emission system tester is not available, go to step 47). If system holds vacuum for 2 minutes, go to step 43). If system does not hold vacuum for 2 minutes, go to next step.
37. Step 42) Leave ignition on and evaporative emission system pressurized. Using scan tester, access FTP V PID. If FTP V PID is 4.42-4.78 volts, go to next step. If voltage is not as specified, replace FTP sensor and go to step 61).
38. Step 43) Leave ignition on and evaporative emission system pressurized. Close purge air inlet tube at CV solenoid port. If system does not hold vacuum for 2 minutes, go to step 45). If system holds vacuum for 2 minutes, go to next step.
39. Step 44) Check FTP Signal For Short To Power Leave ignition off. Disconnect CV solenoid wiring harness connector. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950). Connect PCM to breakout box. Turn ignition on. Measure voltage between negative battery terminal and VPWR terminal at CV solenoid wiring harness connector. If voltage is 10.5 volts or more, replace CV solenoid and go to step 61). If voltage is less than 10.5 volts, repair open in VPWR circuit and go to step 61).
40. Step 45) Check For Leaks Using Ultra Sonic Leak Detector Leave ignition on and CV solenoid wiring harness connector disconnected. Using ultra sonic earphones, pass probe over fuel vapor hoses and connections. If sudden audible change is detected (indicating leak), isolate and repair as necessary. If leak is not detected, release system pressure and go to next step.
41. Step 46) Check Fuel Vapor Hose Leave ignition on and CV solenoid wiring harness connector disconnected. Remove and plug fuel vapor hose from carbon canister at VMV. Using evaporative emission system tester, pressurize evaporative system at 14 in. Hg. When pressure stabilizes, remove plug from fuel vapor hose. If pressure drops immediately, install fuel fill cap and tighten to first click. Go to next step. If pressure does not drop immediately, isolate restriction in system and repair as necessary. Reconnect all components and go to step 61).
42. Step 47) Check Intake Manifold Vacuum At VMV Leave ignition off. Connect VMV wiring harness connector. Disconnect hoses from VMV at intake manifold. Start engine and allow to idle. Check for vacuum at intake manifold. If vacuum is present, go to next step. If vacuum is not present, isolate fault. Repair as necessary and go to step 61).
43. Step 48) Check VMV Ability To Hold Vacuum Leave ignition off. Connect vacuum pump to disconnected end of VMV hose. Using vacuum pump, apply 16 in. Hg. If vacuum bleeds off immediately, go to next step. If vacuum does not bleed off immediately, isolate hose restriction and repair as necessary. Go to step 61).
44. Step 49) Check VMV Turn ignition off. Reconnect VMV wiring harness connector. Disconnect VMV fuel vapor hose from intake manifold port at VMV. Attach vacuum pump with gauge to intake manifold port at VMV. Using vacuum pump, apply 16 in. Hg to VMV. If vacuum bleeds off immediately, go to next step. If vacuum is not bled off immediately, replace VMV and go to step 61).
45. Step 50) Check VPWR Circuit Voltage Turn ignition off. Connect PCM to breakout box. Disconnect VMV wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of VMV wiring harness connector and battery ground. If voltage is 10.5 volts or more, go to next step. If voltage less than 10.5 volts, repair open in VPWR circuit, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
46. Step 51) Check VMV Turn ignition off. Ensure PCM is connected to breakout box. Reconnect VMV vacuum input hose. Disconnect fuel vapor to carbon canister hose. Connect vacuum gauge to vacuum port. Start engine and allow to idle for 5 minutes. Vacuum gauge should read zero. Connect jumper wire between test pin No. 56 (VMV) and test pin No. 51 or 103 at breakout box. Vacuum should be about engine manifold vacuum. If vacuum is not as specified, replace VMV and go to step 61). If vacuum is as specified, remove vacuum gauge and jumper wire. Go to next step.
47. Step 52) Check CV Circuit Continuity Turn ignition off. Disconnect CV solenoid wiring harness connector. Disconnect PCM from breakout box. Measure resistance between test pin No. 67 at breakout box and CV terminal at CV solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in CV circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
48. Step 53) Check CV Circuit For Short To Power Turn ignition on. Measure voltage between test pin No. 67 and test pin No. 51 or 103 at breakout box. If voltage is more than 10.5 volts, repair CV circuit short to VPWR. If voltage is 10.5 volts or less, go to step 61). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 56). No test procedures have been omitted.
49. Step 56) DTC P1450 Or P1452 Turn ignition off. Remove input vacuum hose from VMV. Connect vacuum pump to VMV. Using vacuum pump, apply 10 in. Hg to solenoid. If vacuum is held for one minute, replace VMV and go to step 61). If vacuum is not held for one minute, remove vacuum pump and go to next step.
50. Step 57) Check VREF Connectors Leave ignition off. Check VREF circuit terminal at FTP sensor and PCM. If terminal connectors are okay, go to next step. If terminal connectors are faulty, go to step 61).
51. Step 58) Check CV Circuit Continuity Turn ignition off. Disconnect FTP solenoid wiring harness connector. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 90 at breakout box and VREF terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, replace FTP sensor and go to next step. If resistance is 5 ohms or more, repair open in VREF circuit and go to next step. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 58) to step 61). No test procedures have been omitted.
52. Step 61) Verify EVAP System Repair With ignition on and scan tester connected to DLC, clear PCM memory. Start engine and allow to idle for at least 4 minutes. Drive vehicle 45-60 MPH in high gear for about 8 minutes. Drive vehicle in city traffic condition averaging 25-40 MPH. Ensure at least 5 stop with idle periods of 10 seconds or more. Accelerate vehicle to 45-60 MPH and operate in high gear for about 8 minutes. Stop vehicle and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If DTC P1000 is present, repeat this step. If any other DTCs are present, service as necessary. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-23594-S11873016002001010300000) . If no DTCs are present, testing is complete.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Spark plugs.
2. Spark plug wires.

MISFIRE TROUBLE CODES

1. Step 1) Check Possible Cause Of Misfire Connect engine oscilloscope to vehicle. View parade pattern of ignition secondary system. Go to next step. NOTE: Damaged or contaminated secondary ignition components may cause high catalyst temperatures. Check areas near catalyst and muffler for heat damage.
2. Step 2) Start engine. Normal spark output voltage is 20,000 volts. Maximum spark output variation is 8000 volts. If spark output is not as specified, go to next step. If spark output voltage is as specified, testing is complete. Go to step 8) under CIRCUIT TEST HD.
3. Step 3) If average spark output voltage is more than 20,000 volts with spark output variation less than 8000 volts, check spark plugs for wear and spark plug wires for 7000 ohms per foot maximum resistance. If spark output voltage is not as specified, go to next step.
4. Step 4) If spark output voltage variation is more than 8000 volts, check spark plugs for wide gap or worn electrode. If spark output voltage variation is less than 8000 volts, go to next step.
5. Step 5) If spark output voltage is consistently high in selected cylinders only, check for defective spark plug or wire. If spark output voltage is not as specified, go to next step.
6. Step 6) If spark output voltage is consistently low in all cylinders, check spark plugs for narrow gap and spark plug wires for grounding. If spark output voltage is not as specified, go to next step.
7. Step 7) If average spark output voltage is 15,000 volts or less with spark output variation less than 5000 volts, testing is complete. Go to CIRCUIT TEST HD, step 8). If spark output voltage is not as specified, go to next step.
8. Step 8) If average spark output voltage is more than 15,000 volts with spark output variation less than 5000 volts, check spark plugs for wear and spark plug wire for 7000 ohms per foot maximum resistance. If spark output voltage is not as specified, go to next step.
9. Step 9) If spark output voltage variation is more than 5000 volts, check spark plugs for wide gap or worn electrode. If spark output voltage variation is less than 5000 volts, go to next step.
10. Step 10) If spark output voltage is consistently high in selected cylinders only, check for defective spark plug or wire. If spark output voltage is not as specified, go to next step.
11. Step 11) If spark output voltage is consistently low in all cylinders, check spark plugs for narrow gap and spark plug wires for grounding. If spark output voltage is not as specified, ignition secondary system is okay and testing is complete.

When making a voltage check, a ground reading is a value of less than one volt. A power reading is a value of battery voltage, or up to 2 volts less than battery voltage.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Crankshaft Position (CKP) sensor.
2. CKP wiring harness or connector(s).
3. Spark plug wires.
4. Faulty Powertrain Control Module (PCM).

CKP Sensor Connector Terminals & Test Circuits. Scheme 56

1. Step 1) Check Spark Plugs & Wires Remove and check spark plugs. Check all spark plug wires for damaged insulation or poor connectors. Check primary ignition wiring. Check CKP sensor connector. Repair or replace if necessary. If no faults are found, go to next step. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 4). No test procedures have been omitted.
2. Step 4) Check CKP Circuit To PCM Turn ignition off. Disconnect scan tester from DLC. Disconnect PCM. Check PCM wiring harness connector for damage and repair if necessary. Install Breakout Box (014-000950). Connect PCM wiring harness connector to breakout box. Turn ignition on. Measure voltage between pin No. 21 (CKP+) at breakout box and negative battery terminal. If voltage is not 1-2 volts, go to next step. If voltage is 1-2 volts, go to step 10).
3. Step 5) Check CKP Sensor Turn ignition off. Disconnect CKP wiring harness connector. Turn ignition on. Measure voltage between pin No. 21 (CKP+) at breakout box and negative battery terminal. If voltage is 1-2 volts, go to next step. If voltage is not 1-2 volts, go to step 18).
4. Step 6) Leave ignition on. Measure voltage between pin No. 22 (CKP-) at breakout box and negative battery terminal. If voltage is 1-2 volts, replace CKP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is not 1-2 volts, go to next step.
5. Step 7) If voltage in step 6) was less than 1.0 volt, go to next step. If voltage in step 6) was more than 1.0 volts, go to step 9).
6. Step 8) Turn ignition off. Disconnect PCM from breakout box. Measure resistance between pin No. 22 (CKP-) at breakout box and negative battery terminal. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or less, repair CKP- circuit short to ground.
7. Step 9) Leave PCM disconnected from breakout box. Turn ignition on. Measure voltage between pin No. 22 (CKP-) at breakout box and negative battery terminal. If voltage is less than 0.5 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volts or more, repair CKP sensor short to power and repeat QUICK TEST.
8. Step 10) Set DVOM on AC voltage scale. Crank starter while measuring voltage between pin No. 21 (CKP+) and No. 22 (CKP-) at breakout box. After stabilizing, if AC voltage is less than 0.4 volt, go to next step. If AC voltage is 0.4 volt or more, go to step 60) under CIRCUIT TEST JE.
9. Step 11) Turn ignition off. Disconnect PCM from breakout box. Set DVOM on AC voltage scale. Crank starter while measuring voltage between pin No. 21 (CKP+) and No. 22 (CKP-) at breakout box. After stabilizing, if voltage is less than 0.4 volt, go to next step. If voltage is 0.4 volt or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
10. Step 12) Turn ignition off. Measure resistance between pin No. 21 (CKP+) and No. 22 (CKP-) at breakout box. If resistance is 300-800 ohms, go to step 16). If resistance is not 300-800 ohms, go to next step.
11. Step 13) If resistance in step 12) was more than 300 ohms, go to next step. If resistance in step 12) was 300 ohms or less, go to step 17).
12. Step 14) Check CKP Sensor Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950). Connect EI Diagnostic Harness between CKP sensor and wiring harness connector. Use appropriate overlay. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to "4/6" or "8" cylinder position. Measure resistance between breakout box test pins No. 21 (CKP+I) and J31 (CKP+S). If resistance is less than 1050 ohms, go to next step. If resistance is 1050 ohms or more, repair open in CKP+ circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
13. Step 15) Leave ignition off. Measure resistance between breakout box pin No. 22 (CKP-I) and No. J32 (CKP-S). If resistance is less than 1050 ohms, replace CKP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 1050 ohms or more, repair open in CKP- circuit.
14. Step 16) Check CKP Sensor & Trigger Wheel Leave ignition off. Check CKP sensor and trigger wheel for damage. Repair or replace as necessary. If CKP sensor and trigger wheel are not damaged, ignition system is okay and testing is complete. If symptom still present, see «TESTS W/O CODES - 4.9L»(ref-23707) article.
15. Step 17) Leave ignition off. Disconnect CKP sensor from wiring harness connector. Measure resistance between breakout box pin No. 21 (CKP+I) and No. J22 (CKP-I). If resistance is more than 1000 ohms, replace CKP sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 1000 ohms or less, repair CKP- circuit short to CKP+ circuit.
16. Step 18) If voltage in step 5) was less than 1.0 volt, go to next step. If voltage in step 5) was 1.0 volt or more, go to step 20).
17. Step 19) Check CKP Sensor For Short To Ground Turn ignition off. Disconnect PCM from PCM breakout box. Measure resistance between breakout box test pins 21 (CKP+I) and negative battery terminal. If resistance is less than 10,000 ohms, repair CKP circuit short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or more, replace PCM and repeat QUICK TEST.
18. Step 20) Check CKP Sensor For Short To Power Turn ignition on. Measure voltage between breakout box test pins 21 (CKP+I) and negative battery terminal. If voltage is more than 0.5 volt, repair CKP+ circuit short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 0.5 volt or less, replace PCM and repeat QUICK TEST.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Ignition coil packs.
2. Ignition coil wiring harness.
3. Powertrain Control Module (PCM).

1. Step 1) DTC P0350, P0351 & P0352 Using a spark tester, check for spark at all spark plug wires while cranking engine. If consistent spark is present at all spark plug wires, system is okay and testing is complete. If consistent spark is not present, go to next step.
2. Step 2) Check Secondary Ignition Check spark plugs, spark plug wires and coils for damage, looseness or shorting. Repair or replace as necessary. If secondary ignition looks okay, go to next step.
3. Step 3) Check For COIL PWR At Coil Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Use appropriate overlay. Connect right (Blue) coil tee. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to "4/6" cylinder position. Turn ignition on. Measure voltage between breakout box test pins J5 (COIL PWR) and J7 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in COIL PWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
4. Step 4) Check C1C Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J3 (C1C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, go to step 12).
5. Step 5) Check C2C Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J6 (C2C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, go to step 14).
6. Step 6) Check C1I Circuit At PCM Turn ignition off. Connect PCM wiring harness connector to breakout box. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J26 (C1I). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C1I circuit.
7. Step 7) Check C2I Circuit At ICM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and J52 (C2I). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C2I circuit.
8. Step 8) Check C1C Circuit At Coil Turn ignition off. Disconnect coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J3 (C1C) and J7 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 16).
9. Step 9) Check C2C Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J6 (C2C) and J7 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 17).
10. Step 10) Check C1C Circuit At Coil While Cranking Connect positive lead of EI Diagnostic Harness (007-00059) to battery positive terminal. Connect incandescent test light between breakout box test pins J1 (B+) and J3 (C1C). Crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
11. Step 11) Check C2C Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J6 (C2C). Crank engine. If test light blinks brightly once every engine revolution, replace coil pack and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
12. Step 12) Check Right Coil Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J3 (C1C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace right coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
13. Step 13) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J3 (C1C) and J7(B-). If resistance is less than 10,000 ohms, repair short to ground in C1 circuit. If resistance is 10,000 ohms or more, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
14. Step 14) Check Coil No. 2 Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J6 (C2C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
15. Step 15) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J6 (C2C) and J7(B-). If resistance is less than 10,000 ohms, repair C2C circuit short to ground. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: If C2 circuit is shorted to ground, coil damage may occur.
16. Step 16) Check Coil No. 1 Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J3 (C1C) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage 0.5 volt or more, repair C1C circuit short to power. Clear PCM memory and repeat QUICK TEST.
17. Step 17) Check Coil No. 2 Turn ignition on. Measure voltage between breakout box test pins J6 (C2C) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volt or more, repair C2C circuit short to power. Clear PCM memory and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 17) to step 20). No test procedures have been omitted.
18. Step 20) DTC P0350, P0351, P0352, P0353 & P0354 Using a spark tester, check for spark at all spark plug wires while cranking engine. If consistent spark is present at all spark plug wires, system is okay and testing is complete. If consistent spark is not present, go to next step.
19. Step 21) Check For Spark At Right Spark Plugs If spark is present at right spark plugs, go to next step. If spark is not present at right spark plugs, go to step 38).
20. Step 22) Check Left Spark Plugs & Wires Turn ignition off. Check left side spark plugs and wires for damage or wear. Check all wiring harnesses and connectors damage, burned insulation or poor connections. Repair or replace as necessary. If no faults are found, go to next step.
21. Step 23) Check For COIL PWR At Left Coil Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Use appropriate overlay. Connect left (Yellow) coil tee. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to 8-cylinder position. Turn ignition on. Measure voltage between breakout box test pins J15 (COIL PWR) and J60 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in COIL PWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
22. Step 24) Check C3I Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J30 (LC3C) and J60 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 32).
23. Step 25) Check C4 Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J28 (LC4C) and J60 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 34).
24. Step 26) Check C3 Circuit At PCM Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install a second EEC-V Breakout Box (014-000950). Connect PCM to second breakout box. Turn ignition on. Measure voltage between breakout box test pins J60 (B-) and test pin No. 78 at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C3 circuit.
25. Step 27) Check C4 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J60 (B-) and test pin No 104 at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C4 circuit.
26. Step 28) Check C3 Circuit At Coil Turn ignition off. Disconnect left coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J30 (C3) and J60 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage 0.5 volt or more, go to step 36).
27. Step 29) Check C4 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J28 (C4) and J60 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 37).
28. Step 30) Check C3 Circuit At Coil While Cranking Connect positive lead of EI Diagnostic Harness (007-00059) to battery positive terminal. Connect incandescent test light between breakout box test pins J57 (B+) and J30 (C3). Crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
29. Step 31) Check C4 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J57 (B+) and J28 (C4). Crank engine. If test light blinks brightly once every engine revolution, replace left coil pack and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not blink as indicated, replace PCM and repeat QUICK TEST.
30. Step 32) Check Left Coil Pack Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J30 (C3) and J60 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace left coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
31. Step 33) Check C3 Circuit Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J30 (C3) and J60 (B-). If resistance is less than 10,000 ohms, repair short to ground in C3 circuit. If resistance is 10,000 ohms or more, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
32. Step 34) Check C4 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J28 (C4) and J60 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace left coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
33. Step 35) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J28 (C4) and J60 (B-). If resistance is less than 10,000 ohms, repair C4 circuit short to ground. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: If C4 circuit is shorted to ground, coil damage may occur.
34. Step 36) Turn ignition on. Measure voltage between breakout box test pins J28 (C4) and J60 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volts or more, repair C4 circuit short to power and repeat QUICK TEST.
35. Step 37) Check C3 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J30 (C3) and J60 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volt or more, repair C3 circuit short to power. Clear PCM memory, repeat QUICK TEST.
36. Step 38) Check Right Spark Plugs & Wires Turn ignition off. Check right side spark plugs and wires for damage or wear. Check all wiring harnesses and connectors damage, burned insulation or poor connections. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no faults are found, go to next step.
37. Step 39) Check For COIL PWR At Right Coil Turn ignition off. Connect EI Diagnostic Harness (007-00059) to Breakout Box (014-000950). Use appropriate overlay. Connect right coil tee. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to 8-cylinder position. Turn ignition on. Measure voltage between breakout box test pins J26 (COIL PWR) and J60 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in COIL PWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
38. Step 40) Check C1 Circuit At Right Coil Pack Turn ignition on. Measure voltage between breakout box test pins J23 (RC1C) and J60 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 48).
39. Step 41) Check C2 Circuit At Right Coil Pack Turn ignition on. Measure voltage between breakout box test pins J24 (RC2C) and J60 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 50).
40. Step 42) Check C1 Circuit At PCM Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install a second EEC-V Breakout Box (014-000950). Connect PCM to second breakout box. Turn ignition on. Measure voltage between breakout box test pins J60 (B-) and test pin No. 26 at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C1 circuit.
41. Step 43) Check C2 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J60 (B-) and test pin No. 52 (C2) at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C2 circuit.
42. Step 44) Check C1 Circuit At Coil Turn ignition off. Disconnect right coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J23 (C1) and J60 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage 0.5 volt or more, go to step 52).
43. Step 45) Check C2 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J24 (C2) and J60 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 53).
44. Step 46) Check C1 Circuit At Coil While Cranking Connect positive lead of EI Diagnostic Harness (007-00059) to battery positive terminal. Connect incandescent test light between breakout box test pins J57 (B+) and J23 (C1). Crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
45. Step 47) Check C2 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J57 (B+) and J24 (C2). Crank engine. If test light blinks brightly once every engine revolution, replace right coil pack and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not blink as indicated, replace PCM and repeat QUICK TEST.
46. Step 48) Check C1 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J23 (C1) and J60 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace right coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
47. Step 49) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J23 (C1) and J60 (B-). If resistance is less than 10,000 ohms, repair short to ground in C1 circuit. If resistance is 10,000 ohms or more, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
48. Step 50) Check C2 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J24 (C2) and J60 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace right coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
49. Step 51) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J24 (C2) and J60 (B-). If resistance is less than 10,000 ohms, repair C2 circuit short to ground. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: If C2 circuit is shorted to ground, coil damage may occur.
50. Step 52) Check C1 Circuit Turn ignition on. Measure voltage between breakout box test pins J23 (C1) and J60 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volts or more, repair C1 circuit short to power and repeat QUICK TEST.
51. Step 53) Check C2 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J24 (C2) and J60 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volt or more, repair C2 circuit short to power. Clear PCM memory, repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 60). No test procedures have been omitted.
52. Step 60) DTC P0350, P0351, P0352 & P0353 Using a spark tester, check for spark at all spark plug wires while cranking engine. If consistent spark is present at all spark plug wires, system is okay and testing is complete. If consistent spark is not present, go to next step.
53. Step 61) Check Secondary Ignition Check spark plugs, spark plug wires and coils for damage, looseness or shorting. Repair or replace as necessary. If secondary ignition looks okay, go to next step.
54. Step 62) Check For COIL PWR At Coil Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Use appropriate overlay. Connect (Blue) coil tee. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to 4/6-cylinder position. Turn ignition on. Measure voltage between breakout box test pins J5 (COIL PWR) and J7 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in COIL PWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
55. Step 63) Check C1 Circuit At Coil Pack Turn ignition on. Measure voltage as follows: For horizontal connector coil pack, between breakout box test pins J3 (C1C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J6 (C1C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, go to step 75).
56. Step 64) Check C2 Circuit At Coil Pack Turn ignition on. Measure voltage as follows: For horizontal connector coil pack, between breakout box test pins J6 (C2C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J3 (C2C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, go to step 77).
57. Step 65) Check C3 Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J10 (C3C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, go to step 79).
58. Step 66) Check C1 Circuit At PCM Turn ignition off. Connect PCM wiring harness connector to breakout box. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J26 (C1I). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C1 circuit.
59. Step 67) Check C2 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and J52 (C2I). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C2 circuit.
60. Step 68) Check C3 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and J78 (C3). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C3 circuit.
61. Step 69) Check C1 Circuit At Coil Turn ignition off. Disconnect coil from diagnostic harness coil tee. Turn ignition on. Measure voltage as follows: For horizontal connector coil pack, between breakout box test pins J3 (C1C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J6 (C1C) and J7 (B-). If DC voltage is less than 0.5 volts, go to next step. If voltage is 0.5 volts or more, go to step 81).
62. Step 70) Check C2 Circuit At Coil Leave ignition on. Measure voltage as follows: For horizontal connector coil pack, between breakout box test pins J6 (C2C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J3 (C2C) and J7 (B-). If DC voltage is less than 0.5 volts, go to next step. If voltage is 0.5 volts or more, go to step 82).
63. Step 71) Check C3 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J10 (C3C) and J7 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 83).
64. Step 72) Check C1 Circuit At Coil While Cranking Connect positive lead of EI Diagnostic Harness (007-00059) to battery positive terminal. Connect incandescent test light as follows: For horizontal connector coil pack, between breakout box test pins J1 (B+) and J3 (C1C). For vertical connector coil pack, between breakout box test pins J1 (B+) and J6 (C1C). Crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
65. Step 73) Check C2 Circuit At Coil While Cranking Connect incandescent test light as follows: For horizontal connector coil pack, between breakout box test pins J1 (B+) and J6 (C2C). For vertical connector coil pack, between breakout box test pins J1 (B+) and J3 (C2C). Crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
66. Step 74) Check C3 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J10 (C3C). Crank engine. If test light blinks brightly once every engine revolution, replace coil pack and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not blink as indicated, replace PCM and repeat QUICK TEST.
67. Step 75) Check C1 Circuit For Short To Ground Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins as follows: For horizontal connector coil pack, between breakout box test pins J3 (C1C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J6 (C1C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
68. Step 76) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins as follows: For horizontal connector coil pack, between breakout box test pins J3 (C1C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J6 (C1C) and J7 (B-). If resistance is less than 10,000 ohms, repair short to ground in C1 circuit. If resistance is 10,000 ohms or more, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
69. Step 77) Check Coil No. 2 Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance as follows: For horizontal connector coil pack, between breakout box test pins J6 (C2C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J3 (C2C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
70. Step 78) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance as follows: For horizontal connector coil pack, between breakout box test pins J6 (C2C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J3 (C2C) and J7 (B-). If resistance is less than 10,000 ohms, repair C2 circuit short to ground. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
71. Step 79) Check C3 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J7 (B-) and J10 (C3C). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
72. Step 80) Turn ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J7 (B-) and J10 (C3C). If resistance is less than 10,000 ohms, repair C3 circuit short to ground. If resistance is 10,000 ohms or more, replace PCM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
73. Step 81) Check C1 Circuit Turn ignition off. Disconnect PCM wiring harness connector. Turn ignition on. Measure voltage as follows: For horizontal connector coil pack, between breakout box test pins J3 (C1C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J6 (C1C) and J7 (B-). If voltage is 0.5 volts or more, repair C1 circuit short to power. If DC voltage is less than 0.5 volts, replace PCM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
74. Step 82) Check C1 Circuit Turn ignition off. Disconnect PCM wiring harness connector. Turn ignition on. Measure voltage as follows: For horizontal connector coil pack, between breakout box test pins J6 (C2C) and J7 (B-). For vertical connector coil pack, between breakout box test pins J3 (C2C) and J7 (B-). If voltage is 0.5 volts or more, repair C2 circuit short to power. If DC voltage is less than 0.5 volts, replace PCM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
75. Step 83) Turn ignition off. Disconnect PCM wiring harness connector. Measure voltage between breakout box test pins J7 (B-) and J10 (C3C). If voltage is 0.5 volts or more, repair C3 circuit short to power. If DC voltage is less than 0.5 volts, replace PCM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 83) to step 90). No test procedures have been omitted.
76. Step 90) DTC P0350, P0351, P0352, P0353 & P0354 Using a spark tester, check for spark at all spark plug wires while cranking engine. If consistent spark is present at all spark plug wires, ignition system is okay and testing is complete. If consistent spark is not present, go to next step.
77. Step 91) Check For Spark At Right Spark Plugs If spark is present at right spark plugs, go to next step. If spark is not present at right spark plugs, go to step 108).
78. Step 92) Check Left Spark Plugs & Wires Turn ignition off. Check left side spark plugs and wires for damage or wear. Check all wiring harnesses and connectors damage, burned insulation or poor connections. Check sensor shield connector. Repair or replace as necessary. If no faults are found, go to next step.
79. Step 93) Check For COIL PWR At Left Coil Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Use appropriate overlay. Connect left (Yellow) coil tee. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to 8-cylinder position. Turn ignition on. Measure voltage between breakout box test pins J11 (COIL PWR) and J7 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in COIL PWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
80. Step 94) Check C3I Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J10 (LC3C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 102).
81. Step 95) Check C4 Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J18 (LC4C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 104).
82. Step 96) Check C3 Circuit At PCM Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install a second EEC-V Breakout Box (014-000950). Connect PCM to second breakout box. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and test pin No. 78 at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C3 circuit.
83. Step 97) Check C4 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and test pin No 104 at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, repair open in C4 circuit.
84. Step 98) Check C3 Circuit At Coil Turn ignition off. Disconnect left coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J10 (LC3) and J7 (B-). If DC voltage less than 0.5 volt, go to next step. If DC voltage 0.5 volt or more, go to step 106).
85. Step 99) Check C4 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J18 (C4) and J7 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 107).
86. Step 100) Check C3 Circuit At Coil While Cranking Connect positive lead of EI Diagnostic Harness (007-00059) to battery positive terminal. Connect incandescent test light between breakout box test pins J1 (B+) and J10 (LC3). Crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
87. Step 101) Check C4 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J18 (LC4). Crank engine. If test light blinks brightly once every engine revolution, replace left coil pack and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not blink as indicated, replace PCM and repeat QUICK TEST.
88. Step 102) Check Left Coil Pack Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J10 (C3C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace left coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
89. Step 103) Check C3 Circuit Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J10 (C3C) and J7 (B-). If resistance is less than 10,000 ohms, repair short to ground in C3 circuit. If resistance is 10,000 ohms or more, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
90. Step 104) Check C4 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J18 (LC4) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace left coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
91. Step 105) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J18 (LC4) and J7 (B-). If resistance is less than 10,000 ohms, repair C4 circuit short to ground. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: If C4 circuit is shorted to ground, coil damage may occur.
92. Step 106) Check C3 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J10 (LC3) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If DC voltage is 0.5 volt or more, repair C3 circuit short to power. Clear PCM memory, repeat QUICK TEST.
93. Step 107) Check C4 Circuit Turn ignition off. Disconnect PCM wiring harness connector. Turn ignition on. Measure voltage between breakout box test pins J18 (LC4) and J7 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volts or more, repair C4 circuit short to power and repeat QUICK TEST.
94. Step 108) Check Right Spark Plugs & Wires Turn ignition off. Check right side spark plugs and wires for damage or wear. Check all wiring harnesses and connectors damage, burned insulation or poor connections. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If no faults are found, go to next step.
95. Step 109) Check For COIL PWR At Right Coil Turn ignition off. Connect right coil tee. Turn ignition on. Measure voltage between breakout box test pins J5 (COIL PWR) and J7 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in COIL PWR circuit to right coil. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
96. Step 110) Check C1 Circuit At Right Coil Pack Turn ignition on. Measure voltage between breakout box test pins J3 (RC1C) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 118).
97. Step 111) Check C2 Circuit At Right Coil Pack Turn ignition on. Measure voltage between breakout box test pins J6 (RC2) and J7 (B-). If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, go to step 120).
98. Step 112) Check C1 Circuit At PCM Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install a second EEC-V Breakout Box (014-000950). Connect PCM to second breakout box. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and test pin No. 26 at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If DC voltage is 10.0 volts or less, repair open in C1 circuit.
99. Step 113) Check C2 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and test pin No. 52 (RC2) at second breakout box. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C2 circuit.
100. Step 114) Check C1 Circuit At Coil Turn ignition off. Disconnect right coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J3 (RC1) and J7 (B-). If DC voltage less than 0.5 volt, go to next step. If DC voltage 0.5 volt or more, go to step 122).
101. Step 115) Check C2 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J24 (C2) and J60 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 53).
102. Step 116) Check C1 Circuit At Coil While Cranking Turn ignition off. Reconnect coil lead. Connect positive lead of EI Diagnostic Harness (007-00059) to battery positive terminal. Connect incandescent test light between breakout box test pins J1 (B+) and J3 (RC1). Using starter, crank engine. If test light blinks brightly once every engine revolution, go to next step. If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
103. Step 117) Check C2 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J6 (RC2). Using starter, crank engine. If test light blinks brightly once every engine revolution, replace right coil pack and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If test light does not blink as indicated, replace PCM and repeat QUICK TEST.
104. Step 118) Check C1 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J3 (RC1) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace right coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
105. Step 119) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J3 (RC1) and J7 (B-). If resistance is less than 10,000 ohms, repair short to ground in C1 circuit. If resistance is 10,000 ohms or more, replace PCM. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: If C1 circuit is shorted to ground, coil damage may occur.
106. Step 120) Check C2 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J6 (RC2) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace right coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
107. Step 121) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J24 (C2) and J60 (B-). If resistance is less than 10,000 ohms, repair C2 circuit short to ground. If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: If C2 circuit is shorted to ground, coil damage may occur.
108. Step 122) Check C1 Circuit Turn ignition off. Disconnect PCM wiring harness connector.Turn ignition on. Measure voltage between breakout box test pins J3 (RC1) and J7 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volts or more, repair C1 circuit short to power and repeat QUICK TEST.
109. Step 123) Check C2 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J6 (RC2) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 0.5 volt or more, repair C2 circuit short to power. Clear PCM memory and repeat QUICK TEST.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Fuel pump relay.
2. Inertia Fuel Shutoff (IFS) switch.
3. Wiring harness circuits (B+, FUEL PUMP, FPM, POWER-TO-PUMP and VPWR).
4. Powertrain Control Module (PCM).

Typical Fuel Pump Relay Schematic. Scheme 57

Fuel System Test Circuit & Connector Terminals. Scheme 58

Scheme 59

Scheme 60

1. Step 1) KOEO & KOER DTC P0230 Fuel pump primary circuit has been indicated. Possible causes are as follows: Open or shorted circuit. Faulty fuel pump relay. Faulty PCM. For Continuous Memory DTC P0230, go to step 40). Disconnect fuel pump relay wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at connector and chassis ground. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open in VPWR circuit between EEC power relay and fuel pump relay.
2. Step 2) Check Fuel Pump Relay Turn ignition off. Leave fuel pump relay disconnected. Measure resistance as follows: For ISO relays, between terminals No. 85 and 86 at fuel pump relay. For all other relays, between FUEL PUMP and VPWR terminals at fuel pump relay. Replace fuel pump relay if resistance is not 40-120 ohms. If resistance is okay, measure resistance as follows: For ISO relays, between terminals No. 30 and 87 at fuel pump relay. All other relays, between FUEL PUMP CIRCUIT terminal and B+ and POWER-TO-PUMP terminal individually at fuel pump relay. Replace fuel pump relay if resistance is not 10,000 ohms. If resistance is okay, go to next step. (Scheme 59): ISO Type Fuel Pump Relay Terminals (Scheme 60): Mini Type Fuel Pump Relay Terminals
3. Step 3) Check Fuel Pump Circuit Leave ignition off and fuel pump relay disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 80 and chassis ground. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair short to power in FUEL PUMP circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
4. Step 4) Leave ignition off and fuel pump relay disconnected. Disconnect scan tester from Data Link Connector (DLC). Measure resistance between test pin No. 80 and test pins No. 51, 91 and 103. If each resistance measurement is more than 10,000 ohms, go to next step. If any resistance measurement is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
5. Step 5) Leave ignition off and fuel pump relay disconnected. Measure resistance between FUEL PUMP terminal at fuel pump relay wiring harness connector and test pin No. 80 at breakout box. If resistance is less than 5 ohms and DTC P0231 or P0232 is present, go to next step. If resistance is less than 5 ohms and DTC P0231 or P0232 is not present, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.
6. Step 6) Check PCM Fuel Pump Circuit Leave ignition off. Reconnect PCM and fuel pump relay. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FPA PID or FPF PID. If scan tester indicates YES or ON, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If scan tester does not indicate YES or ON, go to next step.
7. Step 7) Leave scan tester accessed to FPA PID or FPF PID. Using starter, crank engine. If scan tester indicates YES or OFF during crank, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If scan tester does not indicate YES or ON during crank, fuel pump primary circuit is okay. If DTC P0231 is present, go to step 20). If DTC P0232 is present, go to step 10). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 10). No test procedures have been omitted.
8. Step 10) KOEO & KOER DTC P0232 If engine starts, go to next step. If engine does not start, go to step 15). For Continuous Memory DTC P0232, go to step 30).
9. Step 11) Check Fuel Pump Turn ignition on for 5 seconds. Listen for operational noise from fuel pump. If fuel pump can be heard, go to next step. If fuel pump cannot be heard, go to step 13).
10. Step 12) Check Fuel Pump Relay Turn ignition off. Disconnect fuel pump relay. Turn ignition on. Listen for operational noise from fuel pump. If fuel pump operates, repair short to power in FPM or POWER-TO-PUMP circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If fuel pump still does not operate, replace fuel pump relay and repeat QUICK TEST.
11. Step 13) Check FPM Circuit Turn ignition off. Leave fuel pump relay disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 40 and POWER-TO-PUMP circuit at fuel pump relay wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 14) Check PCM Fuel Pump Circuit Leave ignition off. Reconnect PCM and fuel pump relay. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FPM PID. If scan tester indicates OFF, fuel pump primary circuit is okay and testing is complete. If scan tester does not indicate OFF, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
13. Step 15) Check IFS Switch Turn ignition off. Locate IFS switch in trunk near left hinge. Measure resistance between terminals "C" and NC of IFS switch. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, reset or replace IFS switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
14. Step 16) Leave ignition off and IFS switch disconnected. Disconnect fuel pump relay. Measure resistance between POWER-TO-PUMP terminal at fuel pump relay connector and POWER-TO-PUMP terminal at IFS connector. If resistance is less than 7 ohms, go to next step. If resistance is 7 ohms or more, repair open in POWER-TO-PUMP circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
15. Step 17) Leave ignition off, fuel pump relay and IFS switch disconnected. Measure resistance between fuel pump motor ground circuit at connector and chassis ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in fuel pump motor ground circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
16. Step 18) Leave ignition off, fuel pump relay and IFS switch disconnected. Measure resistance between POWER-TO-PUMP terminal at fuel pump connector and POWER-TO-PUMP terminal at IFS connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in POWER-TO-PUMP circuit, repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
17. Step 19) Leave ignition off, fuel pump relay and IFS switch disconnected. Measure resistance between fuel pump motor terminals. If resistance is less than 10 ohms, fuel pump circuits are okay and testing is complete. If resistance is 10 ohms or more, replace fuel pump and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
18. Step 20) KOEO & KOER DTC P0231 If engine starts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If engine does not start, go to next step. For Continuous Memory DTC P0231, go to step 35).
19. Step 21) Check B+ To Fuel Pump Relay Turn ignition off. Disconnect fuel pump relay wiring harness connector. Measure voltage between chassis ground and B+ terminal at wiring harness connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check circuit fuse. If fuse is okay, repair open in B+ circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
20. Step 22) Check POWER-TO-PUMP Circuit Continuity Leave ignition off and fuel pump relay disconnected. Measure resistance between negative battery terminal and POWER-TO-PUMP terminal at wiring harness connector. If resistance is less than 10 ohms, replace fuel pump relay and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance 10 ohms or more, repair open in POWER-TO-PUMP circuit, repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 30). No test procedures have been omitted.
21. Step 30) Continuous Memory DTC P0232 Turn ignition off. Connect scan tester to Data Link Connector. Using scan tester, access FRM PID. Observe PID for indication of fault while wiggling and bending POWER-TO-PUMP circuit between fuel pump relay and fuel pump. Fault will be indicated by FPM PID turning on. Wiggle and bend FPM circuit between PCM and POWER-TO-PUMP circuit splice. Wiggle and bend fuel pump ground circuit. fuel pump. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 30) to step 35). No test procedures have been omitted.
22. Step 35) Continuous Memory DTC P0231 Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Connect jumper wire between test pins No. 77 (PWR GND) and 80 (FP). Connect DVOM between test pins No. 40 (FPM) and 51 (GND). Voltage should be 10 volts or more. Observe DVOM for indication of fault while wiggling and bending B+ circuit to fuel pump relay. Fault will be indicated by sudden change in DVOM voltage. Wiggle and bend POWER-TO-PUMP circuit between fuel pump relay and FPM circuit splice. Lightly tap on fuel pump relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 40). No test procedures have been omitted.
23. Step 40) Continuous Memory DTC P0230 Turn ignition off. Connect scan tester to Data Link Connector. Turn ignition on and wait 5 seconds. Using scan tester, access FPA PID. Observe PID for indication of fault while wiggling and bending FUEL PUMP circuit between fuel pump relay and PCM. Fault will be indicated by FPA PID turning on. Wiggle and bend FPM circuit between PCM and POWER-TO-PUMP circuit splice. Wiggle and bend VPWR circuit between fuel pump relay and EEC-V power relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Fuel shutoff valve relay.
2. Inertia Fuel Shutoff (IFS) switch.
3. Wiring harness circuits (B+, FSV, FSVM, Ground, POWER-TO-FUEL SHUTOFF VALVE and VPWR).
4. Powertrain Control Module (PCM).

Typical Fuel Pump Relay Schematic. Scheme 61

Fuel Shutoff System Test Circuit & Connector Terminals. Scheme 62

1. Step 1) KOEO & KOER DTC P0230 Fuel shutoff valve primary circuit has been indicated. Possible causes are as follows: Open or shorted circuit. Faulty fuel shutoff valve relay. Faulty PCM. For Continuous Memory DTC P0230, go to step 40). Disconnect fuel shutoff valve relay wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at connector and chassis ground. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open in VPWR circuit between EEC power relay and fuel shutoff valve relay.
2. Step 2) Check Fuel Shutoff Valve Relay Turn ignition off. Leave fuel shutoff valve relay disconnected. Measure resistance between terminals No. 85 and 86 at fuel shutoff valve relay. Resistance should be 40-120 ohms. Measure resistance between terminals No. 30 and 87 at fuel shutoff valve relay. Resistance should be more than 10,000 ohms. If resistance is not as specified, replace fuel shutoff valve relay. If resistance is as specified, go to next step.
3. Step 3) Check Fuel Shutoff Valve Circuit Leave ignition off and fuel shutoff valve relay disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 80 (FSV) and chassis ground. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair short to power in FSV circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Leave ignition off and fuel shutoff valve relay disconnected. Disconnect scan tester from Data Link Connector (DLC). Measure resistance between test pin No. 80 (FSV) and test pins No. 51, 103 (PWR GND) and 91 (SIG RTN). If each resistance measurement is more than 10,000 ohms, go to next step. If any resistance measurement is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Leave ignition off and fuel shutoff valve relay disconnected. Measure resistance between FSV terminal at fuel shutoff valve relay wiring harness connector and test pin No. 80 at breakout box. If resistance is less than 5 ohms and DTC P0231 or P0232 is present with DTC 230, go to next step. If resistance less than 5 ohms and specified DTCs are not present, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance 5 ohms or more, repair open circuit, repeat QUICK TEST.
6. Step 6) Check PCM Fuel Shutoff Valve Circuit Leave ignition off. Remove breakout box. Reconnect PCM and fuel shutoff valve relay. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FSV PID. If scan tester indicates YES, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If scan tester does not indicate YES, go to next step.
7. Step 7) Leave scan tester accessed to FSV PID. Using starter, crank engine. If scan tester indicates YES during crank, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If scan tester does not indicate YES during crank, fuel shutoff valve primary circuit is okay. If DTC P0231 is present, go to step 20). If DTC P0232 is present, go to step 10). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 10). No test procedures have been omitted.
8. Step 10) KOEO & KOER DTC P0232 If engine starts, go to next step. If engine does not start, go to step 15). For Continuous Memory DTC P0232, go to step 30).
9. Step 11) Check Power To Fuel Shutoff Valve Turn ignition and all accessories off. Disconnect scan tester from DLC (if applicable). Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 40 (FSVM) and 51 (PWR GND) at breakout box. If voltage is more than 1.5 volts, go to next step. If voltage is 1.5 volts or less, go to step 13).
10. Step 12) Check Fuel Shutoff Valve Relay Turn ignition off. Disconnect fuel shutoff valve relay. Turn ignition on. Measure voltage between test pin No. 40 (FSVM) and 51 (PWR GND) at breakout box. If voltage is less than 1.5 volts, replace fuel shutoff valve relay and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 1.5 volts or more, repair short to power in FSVM or POWER-TO-FUEL SHUTOFF VALVE circuit and repeat QUICK TEST.
11. Step 13) Check FSVM Circuit Turn ignition off. Leave fuel shutoff valve relay disconnected. Measure resistance between test pin No. 40 and POWER-TO-FUEL SHUTOFF VALVE circuit at fuel pump relay wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.
12. Step 14) Check IFS Switch Turn ignition off. Locate IFS switch in trunk near left hinge. Measure resistance between terminals "C" and NC of IFS switch. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, reset or replace IFS switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
13. Step 15) Check Circuit Continuity Leave ignition off, IFS switch and fuel shutoff valve relay disconnected. Measure resistance of POWER-TO-FUEL SHUTOFF VALVE circuit between fuel shutoff valve relay connector and IFS connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in POWER-TO-FUEL SHUTOFF VALVE circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
14. Step 16) Leave ignition off, fuel shutoff valve relay and IFS switch disconnected. Measure resistance between POWER-TO-FUEL SHUTOFF VALVE circuit at IFS connector and chassis ground. If resistance is less than 10 ohms, fault cannot be located and testing is complete. If resistance 10 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 20). No test procedures have been omitted.
15. Step 20) DTC P0231 If engine starts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If engine does not start, go to next step. For Continuous Memory DTC P0231, go to step 35).
16. Step 21) Check B+ To Fuel Shutoff Valve Relay Turn ignition off. Disconnect fuel shutoff valve relay wiring harness connector. Measure voltage between chassis ground and B+ terminal at wiring harness connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check circuit fuse. If fuse is okay, repair open in B+ circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
17. Step 22) Check POWER-TO-FUEL SHUTOFF VALVES Circuit Continuity Leave ignition off and fuel shutoff valve relay disconnected. Measure resistance between negative battery terminal and POWER-TO-FUEL SHUTOFF VALVES terminal at harness connector. If resistance less than 10 ohms, replace fuel shutoff valve relay, repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10 ohms or more, repair open in POWER-TO-FUEL SHUTOFF VALVES circuit and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 30). No test procedures have been omitted.
18. Step 30) Continuous Memory DTC P0232 Turn ignition off. Connect scan tester to Data Link Connector (DLC). Using scan tester, access FSVM PID. Observe PID for indication of fault while wiggling and bending POWER-TO-FUEL SHUTOFF VALVES circuit. Fault will be indicated by FSVM PID turning on. Wiggle and bend fuel shutoff valve ground circuit. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 30) to step 35). No test procedures have been omitted.
19. Step 35) Continuous Memory DTC P0231 Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Connect jumper wire between test pins No. 77 (PWR GND) and 80 (FSV). Connect DVOM between test pins No. 40 (FSVM) and 51 (PWR GND). Voltage should be 10 volts or more. Observe DVOM for indication of fault while wiggling and bending B+ circuit to fuel shutoff valve relay. Fault will be indicated by sudden change in DVOM voltage. Wiggle and bend POWER-TO-FUEL SHUTOFF VALVES circuit between fuel shutoff valve relay and FSVM circuit splice. Lightly tap on fuel shutoff valve relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 40). No test procedures have been omitted.
20. Step 40) Continuous Memory DTC P0230 Turn ignition off. Connect scan tester to Data Link Connector. Turn ignition on and wait 5 seconds. Using scan tester, access FSVF PID. Observe PID for indication of fault while wiggling and bending FUEL shutoff valve circuit between fuel shutoff valve relay and PCM. Fault will be indicated if FSVF PID switches to YES. Wiggle and bend FSV circuit between PCM and fuel shutoff valve relay. Wiggle and bend VPWR circuit between fuel shutoff valve relay and EEC-V power relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Throttle linkage.
2. Wiring harness circuits (IAC and VPWR).
3. Faulty Idle Air Control (IAC) valve.
4. Faulty throttle body.
5. Faulty Powertrain Control Module (PCM).

IAC Circuit & Connector Terminals. Scheme 63

Scheme 64

1. Step 1) DTC P0505, P1504 Or P1507 Perform KOER self-test. If DTC P0505, P1504 or P1507 is present, go to next step. If DTC P0505 or P1507 is not present, IAC system is okay and testing is complete.
2. Step 2) DTC P0505 & P1507 DTC P0505 indicates that IAC system malfunction has been detected. DTC P1504 indicates that IAC circuit malfunction has been detected. DTC P1507 indicates that IAC system under speed fault has been detected. Possible causes are as follows: IAC circuit open or shorted to PWR. VPWR circuit open. Contaminated IAC valve assembly. Damaged throttle body. Faulty PCM. Turn ignition off. Disconnect IAC solenoid. Turn ignition on. Measure voltage between VPWR terminal of IAC solenoid wiring harness connector and battery ground terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open VPWR circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
3. Step 3) Check IAC Solenoid Resistance Turn ignition off. Connect DVOM positive lead to VPWR terminal of IAC solenoid wiring harness connector. Connect DVOM negative lead to IAC terminal. If resistance is 6-13 ohms, go to next step. If resistance is not 6-13 ohms, replace IAC valve assembly and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
4. Step 4) Check IAC Solenoid Internal Short To Case Turn ignition off. Measure resistance between each wiring harness connector terminal and IAC housing. If each resistance is 10,000 ohms or more, go to next step. If either resistance is less than 10,000 ohms, replace IAC solenoid assembly and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
5. Step 5) Check Air Inlet System Turn ignition off. Remove air filter. Inspect air filter, MAF sensor and air inlet system for excessive dirt or contamination. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If air filter is okay, go to next step.
6. Step 6) Check For Vacuum Leaks Start engine and allow to idle. Inspect air inlet system any of the following possible faults: Cracked or punctured air inlet tube. Loose inlet air tube or air cleaner housing. Loose or damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty EGR valve or gasket. Faulty PCV valve or hose. Check entire system for vacuum leaks. Repair or replace as necessary. If no vacuum leaks are found, go to next step.
7. Step 7) Check IAC Circuit Continuity Leave ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 83 (IAC) and IAC terminal at IAC solenoid wiring harness connector. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 5 ohms, go to next step.
8. Step 8) Check IAC Circuit For Short To Power Turn ignition on. Measure voltage between breakout box test pin No. 83 (IAC) and chassis ground. If voltage is one volt or more, repair circuit short to power and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is less than one volt, go to next step.
9. Step 9) Check IAC Circuit For Short To Ground Turn ignition off. Measure resistance between test pin No. 83 (IAC) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance more than 10,000 ohms, go to next step. If resistance less than 10,000 ohms, repair circuit short to ground, repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
10. Step 10) Check IAC Signal From PCM Leave ignition off. Connect PCM to breakout box. Connect IAC solenoid to wiring harness connector. Connect DVOM between test pin No. 83 (IAC) and test pin No. 51 (PWR GND) at breakout box. Start engine and slowly increase speed to 3000 RPM. If voltage is 3.0-11.5 volts, remove IAC solenoid and check throttle body. If throttle body is okay, replace IAC assembly and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If voltage is not 3.0-11.5 volts, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 20). No test procedures have been omitted.
11. Step 20) DTC P1506 This code indicates that IAC system has reached over speed malfunction. Possible causes are as follows: IAC circuit short to ground. IAC assembly stuck open. Air intake leaks or restrictions. Damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty Powertrain Control Module (PCM). Check entire system for vacuum leaks. Repair or replace as necessary. If no vacuum leaks are found, go to next step.
12. Step 21) Check EVAP System Turn ignition off. Disconnect hoses from EVAP canister purge valve or solenoid. Attach vacuum pump with gauge to carbon canister hose port. (Scheme 64) Using vacuum pump, apply 16 in. Hg to port. If vacuum bleeds off within 20 seconds, replace EVAP canister purge valve or solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If vacuum is not bled off immediately, go to next step. (Scheme 64): EVAP Canister Purge Hose Ports
13. Step 22) Check IAC Solenoid Function Start engine and allow to idle. Ensure transmission is in Park or Neutral and engine is warmed to normal operating temperature. Disconnect IAC solenoid wiring harness connector. If engine speed drops, go to next step. If engine speed does not drop, check throttle body for damage. If throttle body is okay, replace IAC solenoid and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
14. Step 23) Check IAC Circuit For Short To Ground Turn ignition off. Disconnect scan tester from DLC. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 83 (IAC) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms and idle speed is normal, go to step 30). If resistance is more than 10,000 ohms and high idle speed is present, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is less than 10,000 ohms, repair circuit short to ground and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 23) to step 25). No test procedures have been omitted.
15. Step 25) DTC P1505: Check Inlet Air Supply DTC P1505 indicates that IAC system has reached the adaptive learning limit. Possible causes are as follows: Air intake leaks or restrictions. Throttle body linkage binding. Contaminated or damaged IAC valve assembly. Damaged throttle body. Inspect air intake system for leaks. Repair or replace as necessary. If air intake system is okay, go to next step.
16. Step 26) Check Air Inlet System Turn ignition off. Remove air filter. Inspect air filter, MAF sensor and air inlet system for excessive dirt or contamination. Repair or replace as necessary and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If air filter is okay, go to next step.
17. Step 27) Check Throttle Body Leave ignition off. Disconnect accelerator cable and air cleaner tube from throttle body. Check cable and throttle body linkage for binding or interference. If faults are present, go to step 3) under CIRCUIT TEST HU. If no faults are present, go to step 8) under CIRCUIT TEST HU. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 27) to step 30). No test procedures have been omitted.
18. Step 30) Check IAC System For Intermittent Open Or Short Circuit Connect scan tester to DLC. Ensure all accessories are off and engine is warmed to normal operating temperature. Turn ignition on. Access IAC PID and RPM PID. IAC duty cycle should be 20-45 percent. Observe IAC PID and RPM PID for indication of fault while wiggling and bending wiring harness between IAC solenoid and PCM. Fault will be indicated by sudden change in IAC PID or RPM PID value. If any are faults found, isolate and repair as necessary. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If no faults are found, problem cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (ACCS, POWER-TO-CLUTCH, VPWR and WAC).
2. Faulty WAC relay.
3. Faulty Powertrain Control Module (PCM).

WAC Test Circuits & Connector Terminals. Scheme 65

Scheme 66

Scheme 67

Scheme 68

1. Step 1) DTC P1460: Verify ACCS PID Is Off Turn ignition off. Ensure A/C and defroster are off. Connect scan tester to Data Link Connector (DLC). Start engine and allow to idle. Using scan tester, access ACCS PID. If ACCS PID is off, go to next step. If ACCS PID is on, go to step 20).
2. Step 2) Check VPWR Circuit Turn ignition off. Disconnect WAC relay wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
3. Step 3) Check WAC Relay Leave ignition off and WAC relay disconnected. Check resistance between relay terminals No. 85 and 86. Replace WAC relay if resistance is not 40-120 ohms. If resistance is okay, check resistance between relay terminals No. 85 and 30, No. 85 and 87, No. 85 and 87A. If resistance is okay, go to next step. If resistance less than 10,000 ohms, replace WAC relay. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). (Scheme 66): WAC Relay Connector Terminals
4. Step 4) Check WAC Circuit Turn ignition off. Leave WAC relay disconnected. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion, and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 69 (WAC) at breakout box and chassis ground. If voltage less than one volt, go to next step. If voltage one volt or more, repair circuit short to power. Start engine, allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
5. Step 5) Turn ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 69 (WAC) and test pins No. 51, 91 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair circuit short to ground. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
6. Step 6) Leave ignition off and relay disconnected. Measure resistance between breakout box test pin No. 69 and WAC terminal at relay connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If resistance is 5 ohms or more, repair open circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.
7. Step 10) Check For Voltage To A/C Cycling Switch Turn ignition off. Disconnect A/C cycling switch. Turn A/C switch on. Measure voltage between chassis ground and A/C Demand terminal or A/C cycling switch. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check for fault in A/C demand switch, EATC module or related wiring harness. See «A/C-HEATER SYSTEM - MANUAL»(ref-23748) article.
8. Step 11) Check For Voltage To A/C Pressure Switch (ACPSW) Turn ignition off. Reconnect A/C cycling switch. Disconnect ACPSW. Turn A/C switch on. Measure voltage between chassis ground and A/C Demand terminal at the ACPSW wiring harness connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check for fault in A/C demand switch, EATC module or related wiring harness. See «A/C-HEATER SYSTEM - MANUAL»(ref-23748) article. (Scheme 67): ACPSW Connector Terminals
9. Step 12) Check Continuity Of ACPSW Contacts Turn ignition off. Leave A/C switch on. Measure resistance between ACPSW high pressure contacts. If resistance is less than 5 ohms, reconnect ACPSW and go to next step. If resistance is 5 ohms or more, check for over-pressurized A/C system. If system pressure is okay, replace ACPSW and verify symptom is corrected.
10. Step 13) Check For Voltage To PCM Leave A/C switch on. Turn ignition off. Reconnect ACPSW. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion, and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 41 (ACCS) and test pin No. 77 (PWR GND) at breakout box. If voltage is one volt or more, repair open circuit between ACPSW and PCM. If voltage is more than 10.5 volts, replace PCM and verify symptom is corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 19). No test procedures have been omitted.
11. Step 19) DTC P1464: Check ACCS PID Turn ignition off. Ensure A/C and defroster are off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is on, go to next step. If ACCS PID is off, verify self-test results. Leave A/C and defroster off and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 20) Turn ignition off. Disconnect ACPSW. Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is off, check for fault in A/C demand switch, EATC module or related wiring harness. See «A/C-HEATER SYSTEM - MANUAL»(ref-23748) article. If ACCS PID is on, go to step 22).
13. Step 21) Check For Short To Power Turn ignition off. Disconnect WAC relay. Turn ignition on. Measure voltage between chassis ground and POWER-TO-CLUTCH terminal of WAC relay connector. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair circuit short to power. Verify symptom is corrected.
14. Step 22) Check ACCS Circuit For Short To Power Turn ignition off. Leave ACPSW and WAC relay disconnected. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion, and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 41 (ACCS) and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is more than one volt, repair circuit short to power. If voltage is one volt or less, proceed as follows: For vehicle without WAC relay, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). For all other models, go to next step.
15. Step 23) Check ACCS Circuit Voltage To PCM Turn ignition off. Reconnect WAC relay. Leave ACPSW disconnected. Turn ignition on. Measure voltage between test pin No. 41 (ACCS) and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is more than one volt, replace WAC relay and verify symptom is corrected. If voltage is one volt or less, replace PCM and verify symptom is corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 23) to step 30). No test procedures have been omitted.
16. Step 30) Continuous Memory DTC P1460 This DTC indicates WAC circuit failure. If vehicle is not equipped with A/C, disregard this DTC. Turn ignition off. Disconnect A/C cycling switch or low pressure switch. Connect jumper wire between switch terminals. Turn ignition and A/C switch on. Check for indication of fault while wiggling and bending WAC circuit between WAC relay and PCM. Fault will be indicated by A/C clicking on. Wiggle and bend WAC circuit between PCM (terminal No. 69) and WAC relay. Lightly tap on WAC relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, go to next step.
17. Step 31) Turn ignition off. Connect scan tester to Data Link Connector (DLC). Leave ignition and A/C switch on. Turn ignition on. Using scan tester, access Output Test Mode. Turn all outputs off. Check for indication of fault while wiggling and bending WAC or ACON circuit between PCM (terminal No. 69) and WAC and A/C relay. Fault will be indicated by A/C clicking on. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 50). No test procedures have been omitted.
18. Step 50) KOEO Or KOER DTC P1460: Check Voltage To A/C Relay This DTC indicates A/C relay primary circuit failure. If A/C or defrost were on during self test, clear PCM memory, repeat «QUICK TEST»(ref-23594-S34023665322001010300000). Turn ignition off. Disconnect A/C relay. Turn ignition off. Disconnect A/C relay. Measure voltage between chassis ground and IGN RUN terminal of A/C relay connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check for damaged fuse. If fuse is okay, repair open in circuit. (Scheme 68): A/C Relay Connector Terminals NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 50) to step 61). No test procedures have been omitted.
19. Step 61) Check ACON Circuit For Short To Power Turn ignition off. Leave A/C relay disconnected. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion, and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between chassis ground and test pin No. 69 (ACON) at breakout box. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair circuit short to power. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
20. Step 62) Check ACON Circuit For Short To Ground Turn ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between chassis ground and test pin No. 69 (WAC) at breakout box. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair circuit short to ground. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
21. Step 63) Check ACON Circuit Continuity Leave ignition off and relay disconnected. Measure resistance between breakout box test pin No. 69 and ACON terminal at A/C relay connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
22. Step 64) Check A/C Relay Leave ignition off. Reconnect A/C relay. Disconnect A/C clutch. Connect voltmeter between A/C clutch terminals. Turn ignition on. Voltage should be less than 1.0 volt. Connect jumper wire between ground and breakout box test pin No. 69 (ACON). Voltage should be more than 10.5 volts. If voltage is as specified, reconnect all components. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If DTC P1460 is still present, replace PCM. If voltage is not as specified, replace A/C relay. Reconnect all components. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 64) to step 70). No test procedures have been omitted.
23. Step 70) DTC P1464: Check ACCS PID Turn ignition off. Ensure A/C and defroster are off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is off, go to next step. If ACCS PID is on, go to step 72).
24. Step 71) Check Low Pressure (LP) Switch Turn ignition off. Disconnect LP switch. Measure resistance between chassis ground and both terminals of LP switch. If resistance is 10,000 ohms or more, check for faulty A/C demand switch. See the A/C-HEATER SYSTEM article. If switch is okay, repair circuit short to ground between LP switch and A/C demand switch. If resistance is less than 10,000 ohms, replace LP switch and verify symptom is corrected.
25. Step 72) Check Low Pressure (LP) Switch Leave ignition off and LP switch disconnected. Disconnect PCM wiring harness connector. Measure resistance between chassis ground and PCM side of LP switch. If resistance is 10,000 ohms or more, replace PCM and verify symptom is corrected. If resistance is less than 10,000 ohms, repair short to ground and verify symptom is corrected.
26. Step 73) Leave ignition off and LP switch disconnected. Disconnect A/C relay. Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is on, go to next step. If ACCS PID is off, go to step 76).
27. Step 74) Leave ignition off, A/C relay and LP switch disconnected. Disconnect WAC relay. Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is on, go to next step. If ACCS PID is off, repair POWER-TO-CLUTCH circuit short to power.
28. Step 75) Check ACCS & A/C DEMAND Circuit For Short To Power Turn ignition off. Leave A/C relay, LP switch and WAC relay disconnected. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion, and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between chassis ground and test pin No. 41 (ACCS) at breakout box. If voltage is one volt or less, replace PCM and verify symptom is corrected. If voltage is more than one volt, repair circuit short to power and verify symptom is corrected.
29. Step 76) Check A/C DEMAND Circuit For Short To Ground Turn ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between chassis ground and A/C DEMAND terminal at LP switch. If resistance is 10,000 ohms or more, replace LP switch and verify symptom is corrected. If resistance is less than 10,000 ohms, repair circuit short to ground and verify symptom is corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 76) to step 100). No test procedures have been omitted.
30. Step 100) Check WAC Relay Contacts Turn ignition off. Disconnect WAC relay wiring harness connector. Measure resistance between terminals No. 3 and 4. (Scheme 66)If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, replace WAC relay and verify symptom is corrected.
31. Step 101) Check Voltage To A/C Clutch Relay Turn ignition off. Disconnect A/C clutch relay. Turn ignition on. Measure voltage between negative battery terminal and IGN RUN terminal of A/C relay connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check system fuse. If fuse is okay, repair open circuit and verify symptom is corrected.
32. Step 102) Check A/C Clutch Relay Ground Circuit Turn ignition off. Leave A/C clutch relay disconnected. Measure resistance between negative battery terminal and ground terminal of relay connector. (Scheme 65)If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and verify symptom is corrected.
33. Step 103) Leave ignition off and A/C clutch relay disconnected. Disconnect A/C clutch. Disconnect scan tester (if applicable). Measure resistance of POWER-TO-CLUTCH circuit between A/C clutch connector and A/C relay connector. Measure resistance of ground circuit between A/C clutch connector and negative battery terminal. If both resistance measurements are less than 5 ohms, replace A/C clutch relay and verify symptom is corrected. If resistance is 5 ohms or more, repair open circuit and verify symptom is corrected. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 103) to step 110). No test procedures have been omitted.
34. Step 110) Check ACCS PID Turn ignition off. Leave ACPSW disconnected. Disconnect A/C clutch relay. Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is off, replace A/C clutch relay and verify symptom is corrected. If ACCS PID is on, go to next step.
35. Step 111) Check ACCS PID Turn ignition off. Leave A/C clutch relay and ACPSW disconnected. Disconnect WAC relay. Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID is off, replace WAC relay and verify symptom is corrected. If ACCS PID is on, go to next step.
36. Step 112) Check ACCS Circuit To PCM For Short To Power Turn ignition off. Leave ACPSW, A/C relay and WAC relay disconnected. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion, and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 41 (ACCS) and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is more than one volt, repair circuit short to power and verify symptom is corrected. If voltage is one volt or less, replace PCM and verify symptom is corrected.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Connection between scan tester and PCM.
2. Connection between scan tester and battery power supply.
3. Correct key sequence executed for outputs.

1. Step 1) Check Scan Tester Installation Turn ignition off. Check connection between scan tester and Data Link Connector (DLC) for damage or contamination. Service or adjust as necessary. If connector is okay, go to next step.
2. Step 2) Check connector and wiring harness cable between scan tester and battery power supply for correct installation, damage or poor connection. Repair as necessary. Ensure correct key sequence for outputs is executed. See scan tester manufacturer instructions.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (SPOUT & VPWR).
2. Faulty ICM.
3. Faulty PCM.

1. Step 1) DTC 1359: Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at wiring harness connector. If voltage 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
2. Step 2) Check Base Timing Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Install coil tee. Use EI (High Data Rate) 6 overlay. Set diagnostic harness box type switch to 4/6- cylinder position. Connect diagnostic harness negative and positive leads to battery corresponding battery terminals. Start engine and check base timing while pressing SPOUT button of diagnostic harness. If base timing is 8-12 degrees BTDC, go to next step. If base timing is not 8-12 degrees BTDC, go to step 9). WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
3. Step 3) Check Spark Advance Release SPOUT button. If timing is more than 15 degrees BTDC, ignition system is okay and testing is complete. If timing is less than 15 degrees BTDC with SPOUT button released, go to next step.
4. Step 4) Check SPOUT Circuit At ICM Start engine and allow to idle. Set DVOM on AC scale. Measure voltage between test pins J7 (B-) and J21. If AC voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, replace ICM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Turn ignition off. Push down and hold SPOUT button of diagnostic harness. Start engine and allow to idle. Measure voltage between test pins J7 (B-) and J21. If AC voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, replace ICM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 6) Check SPOUT Circuit Turn ignition off. Set DVOM on DC scale. Disconnect PCM. Disconnect ICM tee of diagnostic harness from ICM. Turn ignition on. Measure voltage between test pins J7 (B-) and J45 (SPOUT). If DC voltage is 0.5 volt or less, go to next step. If voltage is more than 0.5 volt, repair SPOUT circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: When PCM is disconnected, continuous memory will be erased and a DTC P1000 will be set. DTC P1000 indicates vehicle self-test has not been completed.
7. Step 7) Check SPOUT Circuit Turn ignition off. Disconnect diagnostic harness positive lead from battery. Measure resistance between test pins J7 (B-) and J45 (SPOUT). If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair SPOUT circuit short to ground. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 8) Check SPOUT Circuit Leave ignition off. Install a second breakout box. Measure resistance between test pins J45 (SPOUT) at the first breakout box and test pin No. 50 at the second breakout box. If resistance is less than 5 ohms, replace PCM. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 5 ohms or more, repair open in SPOUT circuit. Clear PCM memory and repeat QUICK TEST.
9. Step 9) Inspect Crankshaft Position (CKP) Sensor & Timing Wheel Leave ignition off. Visually inspect CKP sensor and trigger wheel for damage, loose connections or incorrect installation. Repair or replace as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If CKP sensor and trigger wheel are okay, replace ICM. Clear PCM memory and repeat QUICK TEST.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Faulty Powertrain Control Module (PCM).

1. Step 1) DTC P1359: Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at wiring harness connector. If voltage 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
2. Step 2) Check CKP Sensor & Trigger Wheel Turn ignition off. Check CKP sensor and trigger wheel for damage or misalignment. Repair or replace as necessary. If no faults are found, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuit (MIL).
2. Faulty Powertrain Control Module (PCM).

MIL Circuit Schematic. Scheme 69

1. Step 1) MIL Always On Perform «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If any trouble codes are present, service as necessary before continuing. If no trouble codes are present, turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure and record resistance between test pins No. 2 and No. 51 and 103 (PWR GND). If resistance is less than 5 ohms, repair short circuit between test pin No. 2 and MIL. If resistance is 5 ohms or more, replace PCM.
2. Step 2) MIL Does Not Come On Turn ignition on. Measure voltage between ground side of MIL fuse and negative battery terminal. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step 4).
3. Step 3) Check For B+ At Fuse Leave ignition on. Measure voltage between positive side of MIL fuse and negative battery terminal. If voltage is 10.5 volts or less, repair open in MIL or B+ circuit. If voltage is more than 10.5 volts, replace MIL fuse.
4. Step 4) Check For B+ At MIL Bulb Leave ignition on. Measure voltage between instrument cluster connector terminal B+ and negative battery terminal. If voltage is 10.5 volts or less, repair open in fuse, MIL bulb or B+ circuit. If voltage is more than 10.5 volts, go to next step.
5. Step 5) Check Continuity Of MIL Circuit Turn ignition off. Measure resistance between instrument cluster connector MIL terminal and test pin No. 2 of breakout box. If resistance is less than 5 ohms, replace PCM. If MIL is still on, fault is in instrument cluster. If resistance is 5 ohms or more, repair open in MIL circuit.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Faulty Powertrain Control Module (PCM).

1. Step 1) Continuous Memory DTC P0320 This code indicates that (2) successive erratic Profile Ignition Pulses (PIP) have occurred. Possible causes are as follows: Loose wires and/or connectors. Short circuit to ground in ignition secondary system. Incorrect 2-way radio installation. If any of the specified causes were present, repair or replace as necessary. If vehicle will not start, go to CIRCUIT TEST A. If vehicle will start and none of the specified causes were present, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
2. Step 2) Continuous Memory DTC P1351 Or P1358 This code indicates a loss of IDM input to the PCM. Possible causes are as follows: Open or shorted circuit. Faulty ICM. Faulty PCM. If Continuous Memory DTCs P1350, P1351, P1352, P1353 or P1354 are present, go to CIRCUIT TEST JE, step 60). If any of the specified DTCs are not present, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .

Perform this test when instructed during QUICK TEST or if directed by other test procedures.

1. Step 1) DTC P1270 This DTC indicates that engine or vehicle speed has exceeded calibrated limit. Possible causes are as follows: Wheel slippage caused by mud, ice, water, snow, etc. Over revved engine. Vehicle driven at excessive rate of speed. If any of the specified causes have occurred, system is okay. Clear PCM memory. If none of specified causes have occurred, clear PCM memory. If no other faults are present, testing is complete.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Standard Corporate Protocol (SCP) communication circuits BUS (+) and BUS (-).
2. Wiring harness circuits (CHASSIS GROUND, PWR GND and VBAT).
3. Faulty Powertrain Control Module (PCM).

Data Link Connector (DLC) Test Circuit & Connector Terminals. Scheme 70

Scheme 71

1. Step 1) Verify Self-Test Procedure Is Correct Ensure scan tester is correctly attached to DLC located under dash panel. DO NOT use DLC located in engine compartment. Ensure correct self-test procedure is used. Correct as necessary. If correct procedures were used, go to next step.
2. Step 2) Check For VREF At TP Sensor Turn ignition off. Disconnect TP sensor. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP wiring harness connector. (Scheme 71) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C. NOTE: «KOER SELF-TEST»(ref-23594-S04533554802001010300000) failure or Communication Error message could result if a failure is present in MAF sensor, MLP sensor, VSS or related circuits. (Scheme 71): TP Sensor Harness Connector Terminals
3. Step 3) Ability To Access Continuous Memory DTCs If Continuous Memory DTCs were accessible, go to next step. If Continuous Memory DTCs were not accessible, go to step 7).
4. Step 4) Ability To Activate KOEO SELF-TEST If «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) was entered, go to next step. If KOEO SELF-TEST was not entered, go to step 6).
5. Step 5) Ability To Activate KOER SELF-TEST If «KOER SELF-TEST»(ref-23594-S04533554802001010300000) was entered, DTC is false. Obtain PCM part number and check manufacturer for correct PCM application. If KOER SELF-TEST was not entered, go to next step.
6. Step 6) Perform «QUICK TEST»(ref-23594-S34023665322001010300000). If any trouble codes are present, service as necessary before continuing. If unable to retrieve trouble codes, go to next step.
7. Step 7) Check For Voltage At Data Link Connector (DLC) Inspect DLC for damage and repair as necessary. Turn ignition on. Measure voltage between B+ terminal of DLC and engine ground. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open in B+ circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
8. Step 8) Check DLC Ground Circuit Continuity Turn ignition off. Measure resistance between CHASSIS GROUND terminal of DLC and engine ground. If less than 5 ohms are present, go to next step. If 5 ohms or more are present, repair open in CHASSIS GROUND circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
9. Step 9) Check DLC PWR GND Circuit Continuity Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 51 and 103 (PWR GND) at the breakout box and PWR GND terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit to DLC and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
10. Step 10) Check BUS(-) Circuit Leave ignition off. Measure resistance between test pin No. 15 (BUS-) at the breakout box and BUS(-) terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open in BUS(-) circuit to DLC and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
11. Step 11) Leave ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 15 at the breakout box and engine ground. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair short to ground in BUS(-) circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 12) Turn ignition on. Measure voltage between test pin No. 15 and test pins No. 51 and 103 (PWR GND) at the breakout box and engine ground. If voltage is less than 6.0 volts, go to next step. If voltage is 6.0 volts or more, repair short to power in BUS(-) circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
13. Step 13) Check BUS(+) Circuit Continuity Turn ignition off. Measure resistance between test pin No. 16 (BUS+) at the breakout box and BUS(+) terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in BUS(+) circuit to DLC and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
14. Step 14) Check BUS(+) Circuit For Short To Ground Leave ignition off and scan tester disconnected from DLC. Measure resistance between chassis ground and test pin No. 16 (BUS+) at the breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair BUS(+) circuit short to ground and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
15. Step 15) Check BUS(+) Circuit For Short To Power Turn ignition on. Measure voltage between test pin No. 16 and test pins No. 51 and 103 (PWR GND) at the breakout box. If voltage is less than 1.0 volt, go to next step. If voltage is 1.0 volt or more, repair short to power in BUS(+) circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
16. Step 16) Power Take Off (PTO) Applications If vehicle is equipped with PTO, go to next step. If vehicle is not equipped with PTO, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
17. Step 17) Check PTO PID Turn ignition off. Connect scan tester to Data Link Connector (DLC). Start engine and allow to idle. Using scan tester, access PTO STAT PID. Cycle PTO switch/activator on and off. If PTO STAT PID cycles on, pauses, and then cycles off, PTO is okay. Replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If PTO STAT PID does not cycle as specified, go to CIRCUIT TEST FB.

KAPWR is interrupted when PCM or battery is disconnected. DTC P0603/P1605 may be generated during the next PCM power-up.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Battery terminal condition.
2. Keep Alive Power (KAPWR) circuit routing.
3. KAPWR circuit condition.
4. Faulty Powertrain Control Module (PCM).

Keep Alive Power (KAPWR) Circuit Schematic. Scheme 72

1. Step 1) DTC P0603 & P1605: Check Battery Terminals Inspect battery terminals for corrosion or loose connection. Service or replace as necessary. If battery terminals are okay, go to next step.
2. Step 2) Check Wiring Harness Inspect wiring harness and connectors for damage or corrosion. Ensure wiring harness is not improperly routed too close to ignition or exhaust components. Service or replace if necessary. If wiring harness looks okay, go to next step.
3. Step 3) Check KAPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Connect DVOM between test pin No. 55 (KAPWR) and test pins No. 51 and 103 (PWR GND) at breakout box. Shake and bend small sections of wiring harness between PCM and dash panel. If voltage is continuously 10.5 volts or more, go to next step. If voltage drops to less than 10.5 volts, isolate open in KAPWR circuit and repair as necessary. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Check For DTC P0603 & P1605 Perform «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If DTC P0603 or P1605 is present, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If any other DTCs are present, service as necessary. If no trouble codes are present, testing is complete.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This code indicates that On Board Diagnostics II (OBD II) system self-testing has not been completed. To erase DTC P1000, a complete drive cycle, with successful OBD II system self-test, must occur.

A drive cycle consists of vehicle warmed to normal engine temperature and operated in all speed ranges. After self-test successfully completes, SYSTEM PASS can be obtained from PCM.

DTC P1000 will set in PCM memory when any of the following conditions occur

1. Battery or PCM has been disconnected.
2. An OBD II monitor has failed before completion of drive cycle.
3. PCM memory has been erased with a scan tester.

1. Step 1) Check For Other DTCs If any trouble codes are present, service as necessary. If no trouble codes are present, and vehicle is equipped with PTO, go to next step. If no trouble codes are present, and vehicle is not equipped with PTO, go to step 4).
2. Step 2) Power Take Off (PTO) Applications If vehicle is equipped with PTO, go to next step. If vehicle is not equipped with PTO, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
3. Step 3) Check PTO PID Turn ignition off. Connect scan tester to Data Link Connector (DLC). Start engine and allow to idle. Using scan tester, access PTO STAT PID. Cycle PTO switch/activator on and off. If PTO STAT PID does not cycle as specified, go to CIRCUIT TEST FB. If PTO STAT PID cycles on, pauses, and then cycles off, PTO is okay. Go to next step.
4. Step 4) Attempt To Remove DTC P1000 Test drive vehicle to complete drive cycle. Cruise at 20-45 MPH for at least 4 minutes. Cruise at 30-40 MPH for at least 60 seconds. Cruise at 40-65 MPH for at least 80 seconds. If DTC P1000 is still present, go to next step. If DTC P1000 is not present, testing is complete.
5. Step 5) Check VSS PID Turn ignition off. Connect scan tester to Data Link Connector (DLC). Using scan tester, access VSS PID. Test drive vehicle to complete drive cycle. If VSS PID is more than zero, go to next step. If VSS PID is zero, repair open in VSS circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 6) Check ECT Temperature Ensure engine is at operating temperature. Using scan tester, access ECT PID. If ECT PID is more than 180°F (82°C), repeat drive cycle. If ECT PID is less than 180°F (82°C), repair cooling system fault and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This code indicates that anti-theft system has been activated. When activated, anti-theft system will disable fuel system. To disarm anti-theft system, use key or remote keyless entry to unlock door.

1. Step 1) Check For Other DTCs If any other DTCs are present, service as necessary. If no DTCs other than P1260 are present, go to next step.
2. Step 2) Use key or remote keyless entry to disarm anti-theft system. Clear PCM memory. Start engine. If engine starts, testing is complete. If engine does not start, go to next step.
3. Step 3) Perform «QUICK TEST»(ref-23594-S34023665322001010300000) . If DTC P1260 is still present, fault is in anti-theft system.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (CPP, PNP and SIG RTN).
2. Faulty Clutch Pedal Position (CPP) switch.
3. Faulty Park & Neutral Position (PNP) switch.
4. Faulty Powertrain Control Module (PCM).

CPP Switch Test Circuit & Connector Terminals. Scheme 73

1. Step 1) DTC P0704 & P1709: Check CPP/PNP Switch Function These DTCs indicate CPP/PNP switch malfunction. Possible causes are as follows: Starter relay disconnected during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . CPP/PNP switch circuit damage. Faulty CPP/PNP switch. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to Data Link Connector (DLC). Ensure shift lever is in Neutral. Turn ignition on. Using scan tester, access PNP PID. While observing PNP PID, apply and release clutch pedal. If PNP PID does not cycle on and off, go to next step. If PNP PID cycles on and off, check PCM connector. If connector is okay, replace PCM.
2. Step 2) Check CPP/PNP Switch Turn ignition off. Locate CPP switch near clutch pedal or PNP switch near transmission shift linkage. Inspect switch and bracket for damage and repair if necessary. Disconnect CPP/PNP switch wiring harness connector. Inspect terminals for damage and repair if necessary. Measure resistance between switch terminals. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace CPP/PNP switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
3. Step 3) Check CPP Circuit Turn ignition off. Disconnect scan tester. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 64 (CPP) at breakout box and CPP terminal at CPP switch wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at CPP/PNP switch wiring harness connector. If both resistance measurements are less than 5 ohms, go to next step. If either resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Leave ignition off and CPP switch disconnected. Measure resistance between chassis ground and test pins No. 64 and 91 (SIG RTN) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or more, repair short circuit and repeat QUICK TEST.
5. Step 5) DTC P0704 & P1709: Check CPP/PNP Switch Function These DTCs indicate CPP/PNP switch malfunction. Possible causes are as follows: Starter relay disconnected during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . CPP/PNP switch circuit damage. Faulty CPP/PNP switch. Faulty Powertrain Control Module (PCM). Turn ignition off. Ensure shift lever is in Neutral. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access PNP PID. While observing PNP PID, apply and release clutch pedal; place shift lever in gear then return to Neutral. If PNP PID does not cycle on and off, go to next step. If PNP PID cycles on and off, check PCM connector. If connector is okay, replace PCM.
6. Step 6) Check CPP/PNP Switch Turn ignition off. Locate CPP switch near clutch pedal or PNP switch near transmission shift linkage. Inspect switch and brackets for damage and repair if necessary. Disconnect CPP/PNP switch wiring harness connector. Inspect terminals for damage and repair if necessary. Measure resistance between CPP switch terminals with clutch pedal down. Measure resistance between PNP switch terminals with shift lever inn Neutral. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace CPP/PNP switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
7. Step 7) Check CPP/PNP Circuit Turn ignition off. Disconnect scan tester. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 64 (CPP) at breakout box and CPP/PNP terminal at CPP/PNP switch wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at CPP/PNP switch wiring harness connector. If both resistance measurements are less than 5 ohms, go to next step. If either resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 8) Leave ignition off and CPP/PNP switch disconnected. Measure resistance between chassis ground and test pins No. 64 and 91 (SIG RTN) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is 10,000 ohms or more, repair short circuit and repeat QUICK TEST.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (TCIL and TCS).
2. Faulty Powertrain Control Module (PCM).

TCIL & TCS Circuit Schematic. Scheme 74

1. Step 1) DTC P1780 This code indicates that TCS was not cycled during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . Possible causes are as follows: TCS not cycled during «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . TCS circuit damage. Faulty TCS. Faulty Powertrain Control Module (PCM). Repeat «KOER SELF-TEST»(ref-23594-S04533554802001010300000) if TCS was not cycled in original test. If TCS was cycled during KOER SELF-TEST, go to next step.
2. Step 2) Check TCS Circuit Voltage Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 29 (TCS) and test pins No. 24 and 77 (PWR GND) at breakout box while cycling TCS. If voltmeter reading does not cycle when TCS is cycled, go to next step. If voltmeter reading cycles when TCS is cycled, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
3. Step 3) Check Circuit For Short To Ground Turn ignition off. Disconnect TCS. Inspect pins for damage and repair if necessary. Measure resistance between breakout box test pin No. 29 (TCS) and test pins No. 24 and 77 (PWR GND). If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Check Continuity Of TCS Circuits Leave ignition off. Connect ohmmeter positive lead to TCS key power at the fuse panel. Connect negative lead to power terminal of TCS wiring harness connector. Note resistance measurement. Measure resistance between breakout box test pin No. 29 (TCS) and TCS terminal of TCS connector. If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check Circuit For Short To Power Leave ignition off. Measure resistance between breakout box test pin 29 (TCS) and test pins 71 and 97 (VPWR). If resistance is 10,000 ohms or more, replace TCS switch and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.
6. Step 6) TCIL Always On Turn ignition on. Cycle TCS. If TCIL does not cycle on and off, go to next step. If TCIL cycles on and off, fault is intermittent. Go to CIRCUIT TEST Z.
7. Step 7) Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Turn ignition on. If TCIL goes off, replace PCM. If TCIL remains on, repair TCIL circuit short to ground.
8. Step 8) TCIL Will Not Turn On Perform «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTC P1780 is not present, go to next step. If DTC P1780 is present, go to step 1).
9. Step 9) Turn ignition on. Measure voltage between test pin No. 79 (TCIL) and test pins No. 24 and 76 (PWR GND) at breakout box. If voltage is 2 volts or more, replace PCM. If voltage is less than 2 volts, check indicator bulb and fuse. If bulb and fuse are okay, repair open circuit between test pin No. 79 and ignition switch.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (CCS, EPC, SS1, SS2, SS3, TCC and VPWR).
2. Faulty Powertrain Control Module (PCM).

Transmission Circuit & Connector Terminals (AX4S & AX4N). Scheme 75

Transmission Circuit & Connector Terminals (CD4E). Scheme 76

Transmission Circuit & Connector Terminals (E40D). Scheme 77

Transmission Circuit & Connector Terminals (F4E). Scheme 78

Transmission Circuit & Connector Terminals (4R44E & 4R55E). Scheme 79

Transmission Circuit & Connector Terminals (4R7OW). Scheme 80

TRANSMISSION SOLENOID IDENTIFICATION

1. Step 1) DTC P0731/P0781, P0732/P0782, P0733/P0783, P0734/P0784, P0750, P0751, P0755, P0756, P0760, P0761, P1751, P1756 & P1761 These codes indicate transmission mechanical failure or electrical malfunction. Probable causes are as follows: Internal transmission damage. Shift solenoid damage. Shift solenoid circuit damage. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between VPWR terminal and suspect Shift Solenoid (SS) terminal at transmission wiring harness connector. Repeat procedures under «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If DVOM voltage reading cycles, fault is internal transmission damage. If DVOM voltage reading does not cycle, go to next step.
2. Step 2) Check VPWR Circuit At Solenoid Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 and 97 (VPWR) at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
3. Step 3) Leave transmission wiring harness connector disconnected. Turn ignition off. Measure and record resistance between VPWR terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
4. Step 4) Leave ignition off and transmission wiring harness connector disconnected. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 51, 76 and 91 at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If all resistance measurements are 10,000 ohms or more, fault is internal transmission damage.
5. Step 5) DTC P0741, P0743, P0746, P1727, P1741, P1742, P1743, P1744, P1746, P1747, P1749, P1754, P1788 & P1789 These codes indicate transmission electrical malfunction. Probable causes are as follows: Internal transmission damage. Shift solenoid damage. Shift solenoid circuit damage. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between VPWR terminal and suspect Shift Solenoid (SS) terminal at transmission wiring harness connector. Connect scan tester to Data Link Connector (DLC). Using scan tester, activate scan tester Output Test Mode. Cycle suspect solenoid on and off. If DVOM voltage reading cycles, fault is inside transmission. Circuit testing is complete. If DVOM voltage reading does not cycle, go to next step.
6. Step 6) Check VPWR Circuit At Solenoid Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect scan tester (if applicable). Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 and 97 (VPWR) at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
7. Step 7) Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect scan tester. Measure and record resistance between VPWR terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
8. Step 8) Leave ignition off and transmission wiring harness connector disconnected. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 51, 76 and 91 at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If all resistance measurements are 10,000 ohms or more, fault is internal transmission damage.
9. Step 9) DTC P0731/P0781, P0732/P0782, P0733/P0783, P0734/P0784, P0750, P0751, P0755, P0756, P0760, P0761, P1751, P1756 & P1761 These codes indicate transmission mechanical failure or electrical malfunction. Probable causes are as follows: Internal transmission damage. Shift solenoid damage. Shift solenoid circuit damage. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between chassis ground and suspect Shift Solenoid (SS) terminal at transmission wiring harness connector. Repeat procedures under «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If DVOM voltage reading cycles, fault is internal transmission damage. If DVOM voltage reading does not cycle, go to next step.
10. Step 10) Turn ignition off. Measure resistance between transmission case, engine block, chassis ground and negative battery cable. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair ground circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
11. Step 11) Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If resistance is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
12. Step 12) Check Solenoid Circuit For Short To Power Or Ground Leave transmission wiring harness connector disconnected. Turn ignition on. Measure voltage between test pins No. 51 and 77 at breakout box and chassis ground. If voltage is less than 5 volts, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is 5 volts or more, repair circuit short to power and repeat QUICK TEST.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (TR and SIG RTN).
2. Faulty Powertrain Control Module (PCM).

Transmission Range (TR) Sensor Schematic. Scheme 81

TR Test Circuit & Connector Terminals (AX4N). Scheme 82

TR Test Circuit & Connector Terminals (AX4S & E4OD). Scheme 83

TR Test Circuit & Connector Terminals (CD4E). Scheme 84

PNP & TR Test Circuit & Connector Terminals (F4E). Scheme 85

TR Test Circuit & Connector Terminals (4R70W, 4R44E & 4R55E). Scheme 86

TR SENSOR SPECIFICATIONS

1. Step 1) DTC P0705, P0707, P0708, P0736, P1701 & P1705 Probable causes for these codes are as follows: Misadjusted linkage. Misaligned TR sensor. TR sensor open or shorted circuit. Turn ignition off. Ensure parking brake is applied. Place shift lever in Neutral. Place TR Sensor Gauge (T92P-7010-AH) in TR sensor adjustment slot and go to next step. If gauge does not fit in slot, loosen TR sensor mounting screws and move sensor until gauge fits in slot. Tighten screws and verify shift linkage is properly adjusted. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
2. Step 2) Remove sensor adjustment gauge. Connect scan tester to DLC. Turn ignition on. Using scan tester, access TR PID and TR-V PID. PID reading should be stable. Place gear shift lever in Park position. Tap on TR sensor while monitoring PID voltage for fault. Fault will be indicated by change in PID voltage. Shake and bend sections of wiring harness between TR sensor and PCM. If no faults are indicated, go to next step. If faults are indicated, go to step 4).
3. Step 3) Check TR Sensor Voltage Turn ignition on. Using scan tester, access TR PID and TR-V PID. Voltage reading should be 4-5 volts in Park position. Cycle shift lever through complete gear range. Voltage should be within specification. See «TR SENSOR SPECIFICATIONS»(ref-23594-S38898149742001010300000) table. If each voltage measurement is within specification, fault is internal transmission damage. If any voltage measurement is not within specification, go to next step.
4. Step 4) Check Continuity Of TR Circuits Turn ignition off. Disconnect scan tester. Disconnect TR sensor wiring harness connector. Disconnect PCM 104-pin connector. Inspect terminals for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 64 (TR) at breakout box and TR terminal of TR sensor wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of TR sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
5. Step 5) Leave ignition off and TR sensor disconnected. Measure resistance between test pin No. 64 (TR) and test pins No. 71, 76, 77, 91 and 97 at breakout box. Measure resistance between test pin No. 64 and chassis ground. If all resistance measurements are 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
6. Step 6) Check TR Sensor Resistance Leave ignition off. Reconnect TR sensor. Unlock steering column. Measure resistance between breakout box test pins No. 64 and 91 in each gear range. Resistance should be within specification. See «TR SENSOR SPECIFICATIONS»(ref-23594-S38898149742001010300000) table. If each resistance measurement is within specification, fault is internal transmission damage. If any resistance measurement is not within specification, replace TR sensor and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
7. Step 7) DTC P0705, P0707, P0708, P1705 & P1709 Probable causes for these codes are as follows: Shift lever not in Park. Misadjusted linkage. Misaligned TR switch. Damaged PCM. Turn ignition off. Ensure parking brake is applied. Place shift lever in Neutral. Place TR Sensor Gauge (T93P-70010-A) in TR sensor adjustment slots and go to next step. If gauge does not fit in slot, loosen TR sensor mounting screws and move sensor until gauge fits in slot. Tighten screws and verify shift linkage is properly adjusted. Repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
8. Step 8) Remove sensor adjustment gauge. Connect scan tester to DLC. Turn ignition on. Using scan tester, access PNP PID, TR PID and TR-S PID. PID reading should be stable. Place gear shift lever in Park position. Tap on TR sensor while monitoring PID voltage for fault. Fault will be indicated by change in PID voltage. Shake and bend sections of wiring harness between TR sensor and PCM. If no faults are indicated, go to next step. If faults are indicated, go to step 12).
9. Step 9) Check PNP Circuit Voltage Turn ignition off. Disconnect PNP terminal at starter relay. Turn ignition on. Measure voltage at PNP terminal while cycling shift lever through complete gear range. With shift lever in Park or Neutral, voltage should be 0.5 volts less. With shift lever in any position except Park or Neutral, voltage should be 4.5 volts more. If each voltage measurement is within specification, fault is TR switch. If any voltage measurement is not within specification, go to next step.
10. Step 10) Check Continuity Of TR Circuits Turn ignition off. Disconnect scan tester. Disconnect TR sensor wiring harness connector. Disconnect PCM 104-pin connector. Inspect terminals for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage at test pin No. 71 and 97 at breakout box. Measure voltage at corresponding test pin while cycling shift lever through gear range as follows: Reverse and test pin No. 32. Overdrive and test pin No. 6. Drive and test pin No. 9. 1st gear and test pin No. 7. If each voltage measurement is 10.5 volts or more, fault is TR switch. If any voltage measurement is less than 10.5 volts, go to next step.
11. Step 11) Turn ignition off. Leave PNP disconnected. Inspect connector and repair if damaged. Measure resistance between test pin No. 64 (TR) at breakout box and PNP terminal at connector. (Scheme 85) If resistance is 5 ohms or less, go to step 13). If resistance more than 5 ohms, repair open circuit, repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
12. Step 12) Check Continuity Of TR Circuits Turn ignition off. Disconnect TR sensor wiring harness connector. Measure resistance at breakout box test pin while cycling shift lever through gear range as follows: Reverse and test pin No. 32. Overdrive and test pin No. 6. Drive and test pin No. 9. 1st gear and test pin No. 7. If each resistance measurement is 5 ohms or more, go to next step. If any resistance measurement is less than 5 ohms, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000).
13. Step 13) Check TR Circuit For Short To Power Or Ground Leave ignition off PNP and TR sensor disconnected. Ensure scan tester is disconnected. Measure resistance between test pin No. 64 and test pins No. 71 and 91 at breakout box. Measure resistance between test pins No. 71 and 91 and the following test pins; No. 6, 7, 9 and 32. If each resistance measurement is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000). If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (TFT SIG and SIG RTN).
2. Faulty TFT sensor.
3. Faulty Powertrain Control Module (PCM).

Transmission Test Circuit & Connector Terminals. Scheme 87

TFT SENSOR SPECIFICATIONS (1)

1. Step 1) DTC P0712 This code indicates that self-test has detected TFT sensor circuit input below specification. Possible causes for this code are as follows: Fluid level out of specification. Short circuit in wiring harness. Faulty TFT sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect transmission wiring harness connector. Perform KOEO and «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTC P0713 is present, replace TFT sensor. If DTC P0713 is not present, go to next step.
2. Step 2) Check VREF At TP Sensor Turn ignition off. Leave transmission connector disconnected. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
3. Step 3) Check For Short In TFT Circuit Leave ignition off and transmission connector disconnected. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 37 (TFT) and test pins No. 91 (SIG RTN), 51 and 103 (PWR GND). If any resistance measurement is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If any resistance measurement is more than 10,000 ohms, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 10). No test procedures have been omitted.
4. Step 10) DTC P0713 This code indicates that self-test has detected TFT sensor circuit input above specification. Possible causes for this code are as follows: Fluid level out of specification. Short between TFT and VPWR circuits. Open in TFT or SIG RTN circuit. Faulty TFT sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect transmission wiring harness connector. Install jumper wire between TFT and SIG RTN terminal of connector. Perform KOEO and «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTC P0712 is present, replace TFT sensor. If DTC P0712 is not present, go to next step. If no codes are present, go to step 12).
5. Step 11) Check Circuit Continuity Leave ignition off and transmission wiring harness connector disconnected. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 37 (TFT) at breakout box and TFT terminal at transmission wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at transmission wiring harness connector. If each resistance measurement is less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
6. Step 12) Check TFT Circuit Short To Power Leave transmission wiring harness connector disconnected. Turn ignition on. Measure voltage between test pin No. 37 (TFT) and test pins No. 77 and 103 (PWR GND) at breakout box. If voltage 2 volts or more, repair short to power in TFT circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage is less than 2 volts, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
7. Step 20) DTC P1711 This code indicates that self-test has detected TFT sensor circuit input was out of range specification. Possible causes for this code are as follows: Fluid level out of specification. Fluid not at operating temperature. Faulty TFT sensor. Faulty Powertrain Control Module (PCM). Ensure transmission fluid temperature is at least 50°F (10°C). Perform KOEO and «KOER SELF-TEST»(ref-23594-S04533554802001010300000) . If DTC P1711 is present, go to next step. If DTC P1711 is not present, testing is complete.
8. Step 21) Check VREF At TP Sensor Turn ignition off. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.
9. Step 22) Check TFT Sensor Integrity Warm transmission to normal operating temperature. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Measure and record resistance between test pin No. 37 and 91 at breakout box. As transmission cools, verify resistance increases as specified. See «TFT SENSOR SPECIFICATIONS»(ref-23594-S20725351292001010300000) table. If resistance does not change as specified, replace TFT sensor. If resistance changes as specified, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.
10. Step 90) Continuous Memory DTC P0712 This code indicates that self-test has detected TFT sensor circuit input below specification. Possible causes for this code are as follows: Fluid level out of specification. Short circuit in wiring harness. Faulty TFT sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to DLC. Using scan tester, access TFT PID. If TFT PID is 0.5 volt or more, go to next step. If TFT PID is less than 0.5 volt, return to step 1).
11. Step 91) Wiggle Test TFT Sensor Circuits Turn ignition off. Leave scan tester connected to DLC with TFT PIDs accessed. While shaking and bending TFT sensor wiring harness, observe TFT PID for indication of fault. A fault will be indicated by a sudden change in PID voltage. If fault is indicated, isolate and repair as necessary. If fault is not indicated, problem cannot be duplicated or identified at this time. Testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 91) to step 100). No test procedures have been omitted.
12. Step 100) Continuous Memory DTC P0713 This code indicates that self-test has detected TFT sensor circuit input above specification. Possible causes for this code are as follows: Fluid level out of specification. Short between TFT and VPWR circuits. Open in TFT or SIG RTN circuit. Faulty TFT sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tester to DLC. Using scan tester, access TFT PID. If TFT PID is 4.8 volts or less, go to next step. If TFT PID is more than 4.8 volts, return to step 10).
13. Step 101) Wiggle Test TFT Sensor Circuits Turn ignition off. Leave scan tester connected to DLC with TFT PIDs accessed. While shaking and bending TFT sensor wiring harness, observe TFT PID for indication of fault. A fault will be indicated by a sudden change in PID voltage. If fault is indicated, isolate and repair as necessary. If fault is not indicated, problem cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 101) to step 110). No test procedures have been omitted.
14. Step 110) Continuous Memory DTC P1783 This code indicates that transmission has overheated. Possible causes for this code are as follows: Incorrect transmission fluid level. Faulty transmission cooling system. Excessive load hauling. Faulty transmission connector. Turn ignition off. Disconnect transmission wiring harness connector. Perform «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) . If DTC P1783 is present, repair cause of transmission overheating as necessary. If DTC P1783 is not present, testing is complete.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (OSS/TSS and SIG RTN).
2. Faulty OSS sensor.
3. Faulty TSS sensor.
4. Faulty Powertrain Control Module (PCM).

OSS/TSS Test Circuit & Connector Terminals. Scheme 88

F4E Transmission Test Circuit & Connector Terminals. Scheme 89

4R44E/4R55E Transmission Test Circuit & Connector Terminals. Scheme 90

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Generic electronic module wiring harness circuits.
2. Powertrain Control Module (PCM).

Generic Electronic Module Test Circuit & Connector Terminals. Scheme 91

1. Step 1) DTC P1729 & P1781 DTC P1729 indicates 4x4 switch open or short circuit. DTC P1781 indicates 4x4L switch position closed during «QUICK TEST»(ref-23594-S34023665322001010300000) . If switch position was not 4x2 or 4x4H during «KOEO SELF-TEST»(ref-23594-S38515707612001010300000) , select 4x2 or 4x4H and repeat QUICK TEST. If switch position was as specified, go to next step.
2. Step 2) Check Intermittent Circuit Failure Turn ignition off. Connect scan tester to DLC. Using scan tester, access 4x4L PID. Turn ignition on. Cycle switch to 4x2. Shake and bend sections of wiring harness between generic electronic module and transfer case wiring harness connector. Shake and bend sections of wiring harness between generic electronic module PCM. Tap wiring harness connector to simulate road shock. If scan tester voltage fluctuates, isolate fault and repair as necessary. If scan tester voltage does not fluctuate, go to next step.
3. Step 3) Check Signal From PCM Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. While cycling switch, measure voltage between breakout box test pin No. 14 and No. 24 (PWR GND). If voltage cycles, replace PCM and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) . If voltage does not cycle, go to next step.
4. Step 4) Check Circuit Continuity Turn ignition off. Disconnect generic electronic module. Inspect pins for damage and repair if necessary. Measure resistance between breakout box test pin No. 14 and Yellow/Black wire terminal at generic electronic module wiring harness connector. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .
5. Step 5) Check For Short To Power Or Ground Leave ignition off. Reconnect generic electronic module. Measure resistance between breakout box test pin No. 14 and No. 24. If resistance is more than 10,000 ohms, repair transfer case mechanical fault. If resistance is 10,000 ohms or less, repair short circuit and repeat «QUICK TEST»(ref-23594-S34023665322001010300000) .

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Before continuing with this circuit test, ensure that the following areas are in good condition

1. Air induction system.
2. Vacuum hoses and connections.
3. Wiring harness connectors.
4. Fuel system.
5. Added aftermarket equipment.
6. Base engine.

Testing Typical PCM Output Control Circuit. Scheme 92

1. Step 1) Intermittent Test Procedure Proceed to the appropriate circuit test as follows: INPUT CIRCUIT TEST PRIORITY Circuit Step 10) (1) Step 30) (2) (3) Step 40) ACCS 1st 3rd 2nd BOO 1st 3rd 2nd CMP (4) 1st 2nd 3rd DPFEGR 1st 2nd 3rd ECT 1st 2nd 3rd FP 1st 3rd 2nd IAT 1st 2nd 3rd IMRCM 1st 2nd 3rd MAF 1st 2nd 3rd OCTADJ 1st 3rd 2nd O2S 1st 3rd 2nd PF 1st 2nd 3rd PSP 1st 3rd 2nd TCS 1st N/A 2nd TFT 1st 3rd 2nd TP 1st 3rd 2nd TPB 1st 3rd 2nd TR 1st 3rd 2nd TSS 1st 3rd 2nd (1) Input test (sensor) procedure. (2) Water soak check procedure. (3) Road test procedure. (4) Go to step 50) before performing WATER SOAK TEST. OUTPUT CIRCUIT TEST PRIORITY Circuit Step 10) (1) Step 30) (2) (3) Step 40) ACP 1st 3rd 2nd AIR 1st 3rd 2nd EVAPCVA 1st 3rd 2nd EPC 1st 3rd 2nd EVRVR 1st 3rd 2nd FPM 1st 3rd 2nd HFC 1st 3rd 2nd HTR11A 1st 3rd 2nd HTR12A 1st 3rd 2nd HTR21A 1st 3rd 2nd HTR22A 1st 3rd 2nd IAC 1st 3rd 2nd IMRC 1st 3rd 2nd INJ 1st 3rd 2nd LFC 1st 3rd 2nd MIL 1st N/A 2nd SS1 1st 3rd 2nd SS2 1st 3rd 2nd SS3 1st 3rd 2nd TATC (4) 1st 3rd 2nd TCC 1st 3rd 2nd TCIL 1st 3rd 2nd 4X4L 1st 3rd 2nd (1) Output test (actuator) procedure. (2) Water soak check procedure. (3) Road test procedure. (4) Go to step 50) before performing WATER SOAK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 10). No test procedures have been omitted.
2. Step 10) Intermittent Input Test (Sensor) Procedure Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or component fault. Turn ignition on. While observing PID value, wiggle and pull on component wiring and connector. See «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. Lightly tap on component. If PID value(s) is okay, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace suspect component. If replacement component does not repair fault, install original component and go to next step.
3. Step 11) Leave ignition on with PIDs accessed. While observing PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. If PID value(s) remain within specification, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace PCM. If replacement PCM does not repair fault, install original PCM. Return to step 1) and choose another procedure.
4. Step 12) Intermittent Input KOER Wiggle Test Leave ignition on with PIDs accessed. Access PIDs from the area of suspected wiring or component fault. Start engine and allow to idle. While observing PID value, wiggle and pull on component wiring and connector. See «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. Lightly tap on component. If PID value(s) is okay, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace suspect component. If replacement component does not repair fault, install original component and go to next step.
5. Step 13) Leave engine running at idle speed with PIDs accessed. While observing PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. If PID value(s) remain within specification, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace PCM. If replacement PCM does not repair fault, install original PCM. Return to step 1) and choose another procedure. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 20). No test procedures have been omitted.
6. Step 20) Intermittent Output Test (Actuator) Procedure If no symptoms or trouble codes are present, perform road test procedure specified insteps 40) through 43). Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or component fault. Record trouble codes in PCM memory, if present. Disconnect 104-pin connector from PCM. Install Breakout Box (014-000959). Connect PCM to breakout box. Connect positive lead of voltmeter to output control circuit of suspect component. (Scheme 92) Connect negative lead to ground. Turn ignition on. Using scan tester, enter Output Test Mode. Activate suspect component. While observing voltmeter reading and PID value, lightly tap on component. Compare readings to specification. See «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. If readings are correct and remain stable within one volt, go to next step. If readings are incorrect or unstable within one volt, replace component. If replacement component does not repair fault, install original component and go to next step.
7. Step 21) Leave ignition on with PIDs accessed. While observing voltmeter reading and PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. Compare readings to specification. See «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. If readings are correct and remain stable within one volt, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If readings are incorrect or unstable within one volt, isolate fault and repair as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 30). No test procedures have been omitted.
8. Step 30) Intermittent Water Soak Check Procedure Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or component fault. Start engine and allow to idle. Spray water on suspect component, circuit and connector. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. If no faults occur, go to next step. If fault occurs, isolate and repair as necessary.
9. Step 31) With engine running, spray water on spark plugs, spark plug wires, ICM, CKP sensor and CMP sensor. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. See «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. If no faults occur, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If fault occurs, isolate and repair as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 40). No test procedures have been omitted.
10. Step 40) Intermittent Road Test Procedure This procedure will monitor PIDs and components using a scan tester on a road test. An assistant is necessary for some procedures. This procedure is performed under 4 different conditions: KOEO Engine Running At Idle Speed 30 MPH 55 MPH Compare information with specifications listed in «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or fault. Compare values to KOEO values given in «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. Watch for fault indicated by PID value out of specification. If no faults occur, go to next step. If fault occurs, go to step 10) for input system fault or step 20) for output system fault.
11. Step 41) With scan tester connected to DLC, remain in PID access mode. Start engine and allow to idle. With engine warmed to operating temperature, watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to HOT IDLE values given in «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. If values remain within specification, go to next step. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.
12. Step 42) Leave scan tester connected to DLC in PID access mode. Ensure all accessories are off. Using an assistant, test drive vehicle at 30 MPH. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to 30 MPH values given in «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. If values remain within specification, go to next step. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.
13. Step 43) Leave scan tester connected to DLC in PID access mode. Test drive vehicle at 55 MPH. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to 55 MPH values given in «PIN VOLTAGE/PID VALUE CHARTS - 4.9L»(ref-23755) article. If values remain within specification, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 43) to step 50). No test procedures have been omitted.
14. Step 50) Intermittent Ignition Test Procedure Ensure all accessories are off. Perform «QUICK TEST»(ref-23594-S34023665322001010300000). If trouble codes are present, service as necessary before continuing. If no trouble codes are present, connect Intermittent Ignition Analyzer (007-000075) and go to next step. If intermittent ignition analyzer is not available, return to step 1) and choose another procedure.
15. Step 51) Turn ignition off. Ensure all accessories are off. Install correct overlay on front of tester panel. Install program cartridge in slot. Connect EI HIGH DATA RATE harness adapter to DIST tester. Ensure that CKP SIMULATION switch and WIGGLE TEST switch are off. Disconnect ICM wiring harness connector. Check connector terminals for damage or contamination and repair as necessary. Attach male ICM connector of tester to ICM wiring harness connector. Attach female ICM connector of tester to ICM. Turn ignition on and press tester RESET button. If tester performs self-test and VPWR LED comes on, go to step 53). If tester does not perform self-test or VPWR LED does not come on, go to next step.
16. Step 52) Scan Tester Check Turn ignition off. Disconnect intermittent ignition analyzer. Connect jumper wire between VPWR terminal of tester and positive battery terminal. Connect jumper wire between PWR GND terminal of tester and negative battery terminal. If tester passes self-test, go to next step. If tester does not pass self-test, repair or replace as necessary and go to next step.
17. Step 53) Recreate Fault Turn ignition on. Check Fault Memory and System Status LEDs. If LEDs are on, go to next step. If no LEDs are on, go to step 59).
18. Step 54) If COIL LED is off, go to next step. If COIL LED is on, go to step 80).
19. Step 55) If IGN GND LED is off, go to next step. If IGN GND LED is on, go to step 200). NOTE: If IGN GND or CKP SHD LED comes on anytime during testing, go to step 200) for IGN GND or step 210) for CKP SHD.
20. Step 56) If CKP SHD LED is off, go to next step. If CKP SHD LED is on, go to step 210).
21. Step 57) ICM Status If ICM OK LED is blinking, go to next step. If ICM OK LED is not blinking, go to step 95).
22. Step 58) CKP BIAS Status If CKP BIAS LED is off, go to next step. If CKP BIAS LED is on, go to step 120).
23. Step 59) Recreate Fault Ensure DIST is connected to vehicle. Test drive vehicle. If vehicle will not start, crank engine for 5 seconds. If Fault Memory and System Status LEDs are on, go to next step. If LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure.
24. Step 60) CKP SIGNAL Fault If CKP SIGNAL LED is off during cranking, go to next step. If CKP SIGNAL LED is on during cranking, go to step 130).
25. Step 61) IDM Fault If IDM LED is off, go to next step. If IDM LED is on, go to step 95).
26. Step 62) IDM TACH Fault If IDM TACH LED is off, go to next step. If IDM TACH LED is on, go to step 95).
27. Step 63) CKP Fault If CKP LED is off, go to next step. If CKP LED is on, go to step 130).
28. Step 64) SPOUT Fault If SPOUT LED is off, go to next step. If SPOUT LED is on, go to step 170).
29. Step 65) PIP Fault If PIP LED is off, go to next step. If PIP LED is on, go to step 150).
30. Step 66) BASE TIMING Fault With engine warm, if BASE TIMING LED is off, go to next step. If BASE TIMING LED is on, go to step 170).
31. Step 67) COIL Fault If COIL LED is off, go to next step. If COIL LED is on, go to step 80).
32. Step 68) Secondary Fault If COIL LEDs are flashing, go to intermittent ignition analyzer service manual for CKP SIMULATION TEST. If COIL LEDs are not flashing, go to next step.
33. Step 69) IGN GND Fault If IGN GND LED is off, go to next step. If IGN GND LED is on, go to step 200).
34. Step 70) CKP SHD Fault If CKP SHD LED is off, return to step 1) and choose another procedure. If CKP SHD LED is on, go to step 210). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 70) to step 80). No test procedures have been omitted.
35. Step 80) VBATC Circuit Check Turn ignition off. Disconnect ignition coil packs. Connect Intermittent Ignition Analyzer (007-000075). Turn ignition on. Measure voltage between ignition coil pack wiring harness connector VBATC terminal and IGN GND jack of intermittent ignition analyzer. If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open in VBAT circuit.
36. Step 81) Check For Short Turn ignition off. Measure resistance between IGN GND jack and COIL jack of intermittent ignition analyzer. Measure resistance between VBAT jack and COIL jack of intermittent ignition analyzer. If resistance is 6000 ohms or more, go to next step. If resistance is less than 6000 ohms, go to step 86).
37. Step 82) COIL Circuit Check Leave ignition off. Measure resistance between each ignition coil pack wiring harness connector COIL terminal and corresponding jack of intermittent ignition analyzer. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair open in COIL circuit.
38. Step 83) Coil Check Leave ignition off. Reconnect ignition coil packs. Turn ignition on. Press intermittent ignition analyzer reset button. If all COIL LEDs are off, go to next step. If any COIL LEDs are on, go to step 88).
39. Step 84) Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
40. Step 85) Turn ignition off. Disconnect coil packs. Turn ignition on. Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
41. Step 86) Circuit Check Turn ignition off. Disconnect ICM. Measure resistance between COIL jack and IGN GND jack of intermittent ignition analyzer. Measure resistance between COIL jack and VBAT jack. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair open in COIL circuit.
42. Step 87) Leave ignition off. Measure resistance between each COIL jack and all other COIL jacks of intermittent ignition analyzer. If each resistance measurement is 10,000 ohms or more, replace ICM. If any resistance is less than 10,000 ohms, repair open in coil circuit.
43. Step 88) System Visual Check Leave ignition off. Check ignition system for damage, loose connections or corrosion. Repair if necessary. If ignition system looks okay, replace ignition coil pack(s). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 88) to step 95). No test procedures have been omitted.
44. Step 95) IDM TACH Fault If IDM TACH LEDs were off when fault was recreated, go to next step. If IDM TACH LEDs were on when fault was recreated, replace ICM.
45. Step 96) Circuit Check Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Measure resistance between IDM jack and VPWR jack of intermittent ignition analyzer. Measure resistance between IDM jack and PWR GND jack. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, go to step 102).
46. Step 97) ICM Check Turn ignition off. Reconnect ICM. Turn ignition on. Press intermittent ignition analyzer RESET button. If ICM OK LED is blinking, go to next step. If ICM OK LED is not blinking, replace ICM.
47. Step 98) Wiggle Check Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Set MODE switch to "B". Press intermittent ignition analyzer RESET button and wait 5 seconds for initialization. If all fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
48. Step 99) Turn ignition off. Disconnect PCM 104-pin connector. Turn ignition on. Press intermittent ignition analyzer RESET button and wait 5 seconds for initialization. If all fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
49. Step 100) If any IDM codes were present in «QUICK TEST»(ref-23594-S34023665322001010300000), go to next step. If IDM codes were not present in QUICK TEST, replace ICM.
50. Step 101) Circuit Check Leave ignition off and PCM disconnected. Measure resistance between IDM jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair IDM circuit short in wiring harness.
51. Step 102) Leave ignition off and PCM disconnected. Measure resistance between IDM jack and PWR GND jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, replace PCM. If resistance is less than 10,000 ohms, repair IDM circuit short in wiring harness.
52. Step 103) Turn ignition off. Install EEC-V Breakout Box (014-00950). Measure resistance between IDM jack of intermittent ignition analyzer test pins No. 4 at the breakout box. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open circuit between ICM and PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 103) to step 120). No test procedures have been omitted.
53. Step 120) Check CKP BIAS Turn ignition off. Disconnect CKP sensor wiring harness connector. Turn ignition on. If CKP BIAS LEDs are off, go to next step. If CKP BIAS LEDs are on, go to step 122).
54. Step 121) Circuit Check Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Measure resistance between CKP+ jack and VPWR jack of intermittent ignition analyzer. Measure resistance between CKP+ jack and PWR GND jack. If resistance is 10,000 ohms or more, replace ICM. If resistance is less than 10,000 ohms, repair CKP+ circuit short in wiring harness.
55. Step 122) Circuit Check Turn ignition off. Measure resistance between CKP- jack and VPWR jack of intermittent ignition analyzer. Measure resistance between CKP- jack and PWR GND jack. If resistance is 10,000 ohms or more, replace CKP sensor. If resistance is less than 10,000 ohms, go to next step.
56. Step 123) Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Measure resistance between CKP- jack and PWR GND jack. Measure resistance between CKP- jack and VPWR jack of intermittent ignition analyzer. If each resistance measurement is 10,000 ohms or more, replace ICM. If either resistance measurement is less than 10,000 ohms, repair CKP- circuit short in wiring harness. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 123) to step 130). No test procedures have been omitted.
57. Step 130) CKP Signal Check Crank or start engine. If CKP SIGNAL LED is on, go to next step. If CKP SIGNAL is off, go to step 132).
58. Step 131) Wiggle Check Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
59. Step 132) Circuit Check Turn ignition off. Disconnect CKP sensor. Measure resistance between CKP+ terminal of CKP sensor wiring harness connector and CKP+ jack of intermittent ignition analyzer. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair CKP+ open circuit in wiring harness.
60. Step 133) Leave ignition off. Measure resistance between CKP- terminal of CKP sensor wiring harness connector and CKP- jack of intermittent ignition analyzer. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair CKP- open circuit in wiring harness.
61. Step 134) Leave ignition off. Measure resistance between CKP+ jack and CKP- jack of intermittent ignition analyzer. If resistance is less than 10,000 ohms, go to next step. If resistance is 10,000 ohms or more, go to step 136).
62. Step 135) Sensor Check Turn ignition off. Inspect CKP sensor and data wheel for damage, correct alignment and air gap. Service sensor and data wheel as necessary. If no problems are found, replace CKP sensor.
63. Step 136) Leave ignition off. Disconnect ICM from analyzer. Measure resistance between CKP+ jack and CKP- jack of intermittent ignition analyzer. If resistance is less than 10,000 ohms, CKP+ and CKP- are shorted together. Repair as necessary. If resistance is 10,000 ohms or more, replace ICM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 136) to step 150). No test procedures have been omitted.
64. Step 150) Capture Fault Crank or start engine. If PIP LED is blinking, go to next step. If PIP is not blinking, go to step 157).
65. Step 151) Turn ignition off Disconnect ICM from analyzer. Measure resistance between PIP jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between PIP jack and VPWR jack. If each resistance is 10,000 ohms or more, go to next step. If either resistance is less than 10,000 ohms, go to step 158).
66. Step 152) Turn ignition on. Measure voltage between PIP jack and PWR GND jack of intermittent ignition analyzer. If voltage is 8.0 volts or less, go to next step. If voltage is more than 8.0 volts, repair PIP circuit short to VPWR.
67. Step 153) Turn ignition off. Reconnect ICM to analyzer. Turn ignition on. Measure voltage between PIP jack and PWR GND jack of intermittent ignition analyzer. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, replace ICM.
68. Step 154) Wiggle Check Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
69. Step 155) Turn ignition off. Disconnect ICM from analyzer. Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to ON position. Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
70. Step 156) Leave ignition off. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
71. Step 157) Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
72. Step 158) Turn ignition off. Disconnect PCM 104-pin connector. Measure resistance between PIP jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between PIP jack and VPWR jack. If each resistance is 10,000 ohms or more, replace PCM. If either resistance is less than 10,000 ohms, repair short in PIP circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 158) to step 170). No test procedures have been omitted.
73. Step 170) If engine starts, go to next step. If engine does not start, go to step 178).
74. Step 171) Start engine. If BASE TIMING LED is off, go to next step. If BASE TIMING LED is on and all fault memory LEDs are off, replace ICM.
75. Step 172) If SPOUT LED is blinking, go to next step. If SPOUT is on, go to step 180).
76. Step 173) Check Circuit Turn ignition off. Disconnect PCM 104-pin connector. Measure resistance between SPOUT jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between SPOUT jack and VPWR jack. If each resistance is 10,000 ohms or more, go to next step. If either resistance is less than 10,000 ohms, go to step 183).
77. Step 174) Turn ignition off. Disconnect ICM from analyzer. Disconnect PCM 104-pin connector. Measure resistance between SPOUT jack and PWR GND jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace PCM.
78. Step 175) Leave ignition off. Measure resistance between SPOUT jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace PCM.
79. Step 176) Wiggle Check Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
80. Step 177) Leave ignition and intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "A". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
81. Step 178) Turn ignition off. Disconnect PCM 104-pin connector. Install EEC-V Breakout Box (014-00950). Measure resistance between PIP jack of intermittent ignition analyzer test pins No. 56 at the breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PIP circuit.
82. Step 179) Measure resistance between IGN GND jack of intermittent ignition analyzer test pins No. 16 at the breakout box. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in IGN GND circuit.
83. Step 180) Turn ignition off. Disconnect PCM 104-pin connector. Install EEC-V Breakout Box (014-00950). Measure resistance between SPOUT jack of intermittent ignition analyzer test pins No. 36 at the breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in SPOUT circuit between ICM and PCM.
84. Step 181) Wiggle Check Turn ignition off. Reconnect PCM. Disconnect ICM from analyzer. Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
85. Step 182) Leave ignition and intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "A". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace PCM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.
86. Step 183) Circuit Check Leave ignition off and ICM disconnected. Measure resistance between SPOUT jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between SPOUT jack and VPWR jack. If each resistance is 10,000 ohms or more, replace ICM. If either resistance is less than 10,000 ohms, repair SPOUT circuit short in harness. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 183) to step 190). No test procedures have been omitted.
87. Step 190) Check For VPWR Turn ignition on. Measure voltage between VPWR jack of intermittent ignition analyzer and negative battery terminal. If voltage is 6 volts or more, go to next step. If voltage is less than 6 volts, repair open in VPWR circuit to ICM.
88. Step 191) Check PWR GND Circuit Turn ignition off. Measure resistance between PWR GND jack of intermittent ignition analyzer and negative battery terminal. If resistance is less than 5 ohms, go to next step. If voltage is 5 ohms or more, repair open in PWR GND circuit to ICM.
89. Step 192) Wiggle Check Connect jumper wire between PWR GND jack of intermittent ignition analyzer and negative battery terminal. Shake and bend wiring harness and connectors. If the intermittent ignition analyzer performs reset, repair open in VPWR circuit to ICM. If the intermittent ignition analyzer does not perform reset, repair open in PWR GND circuit to ICM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 192) to step 200). No test procedures have been omitted.
90. Step 200) Check IGN GND Turn ignition on. Measure voltage between IGN GND jack and PWR GND of intermittent ignition analyzer and negative battery terminal. If voltage is -.5 to.5 volt, go to next step. If voltage is not -.5 to.5 volt, go to step 202).
91. Step 201) Wiggle Check Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If any fault memory LEDs are on, press RESET button and continue to test until intermittent fault is located.
92. Step 202) Check Circuit Turn ignition off. Disconnect PCM 104-pin wiring harness connector. Measure resistance between IGN GND jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, replace ICM. If resistance is less than 10,000 ohms, repair short in IGN GND circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 202) to step 210). No test procedures have been omitted.
93. Step 210) Check Circuit Turn ignition off. Measure resistance between CKP SHD jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, go to step 212).
94. Step 211) Wiggle Check Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent fault is located.
95. Step 212) Check Circuit Turn ignition off. Disconnect ICM from tester. Measure resistance between CKP SHD jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, replace ICM. If resistance is less than 10,000 ohms, repair short in CKP SHD circuit.

4.9L PCM Wiring Diagram (1 Of 4). Scheme 93

4.9L PCM Wiring Diagram (2 Of 4). Scheme 94

4.9L PCM Wiring Diagram (3 Of 4). Scheme 95

4.9L PCM Wiring Diagram (4 Of 4). Scheme 96