Engine Controls - Tests W/codes - 2.0L: Diagnosis Mercury Mystique I

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 CHARTS 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 3)
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 3)
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 or replace as necessary. If fault cannot be isolated, go to 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 3)
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

Scheme 3

1. Select vehicle and engine selection menu. (Scheme 3)
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.

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 3)
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 3)
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 3)
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 Engine Coolant Temp (ECT) sensor, Intake Air Temp (IAT) sensor, and Throttle Position (TP) sensors are required to enable the federal test procedure catalyst monitor. To aid in monitor descriptions. refer to illustration. see scheme 4

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. 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 DTC associated with this test is DTC P0420.
2. Catalyst Efficiency DTC is stored in memory, and Malfunction Indicator Light (MIL) is turned on 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, summarizers the status of all monitors.

OBD-II DRIVE CYCLE & DIAGNOSTIC TROUBLE CODES

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. Once a monitor turns on the MIL, it will require 3 consecutive drive cycles without a fault for the MIL to turn off. Another method of erasing the DTC is by initiating a PCM reset. DTC memory storage requirements vary with each monitor. See appropriate monitor under ON BOARD DIAGNOSTIC-II MONITOR .

DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHARTS

DTC REFERENCE CHART

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

Scheme 4

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. (Scheme 4): Ignition System Test Circuits

1. 1) Starting System Check Ensure Inertia Fuel Shutoff (IFS) 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. 2) Attempt to start engine. If engine now starts, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000), step 50). If engine does not start, go to next step.
3. 3) 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 10) If voltage is 4-6 volts, go to step 6). If resistance not 4-6 volts, go to «CIRCUIT TEST C»(ref-24082-S14410186652001010400000).
4. 4) 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.
5. 5) 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, proceed as follows: Go to «CIRCUIT TEST JD»(ref-24082-S06049554542001010400000), step 1).
6. 6) 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-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000), step 1).
7. 7) 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»(ref-24082-S13544258072001010400000), step 1). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 15). No test procedures have been omitted.
8. 15) Check Fuel Pressure Turn ignition off. Release fuel pressure. Connect fuel pressure gauge to schrader valve. With scan tester connected to DLC, access IPS PID. Turn ignition on and record fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to «CIRCUIT TEST HB»(ref-24082-S20207374752002071600000), step 1). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 17). No test procedures have been omitted.
9. 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-24082-S37578241852001010400000). If test light does not blink as specified, go to «CIRCUIT TEST JD»(ref-24082-S06049554542001010400000), 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.
10. 20) Identify Type Of No-Start Attempt to start engine. If engine now starts, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000), step 50). If engine does not start, go to next step. NOTE: Ensure fuel pump inertia switch is closed (button pushed in).
11. 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.
12. 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»(ref-24082-S14410186652001010400000).
13. 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.
14. 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 not okay, go to next step. If spark is okay, go to «CIRCUIT TEST JB»(ref-24082-S37958038572001010400000), step 1).
15. 25) Check Resistance 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-24082-S37578241852001010400000).
16. 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.
17. 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»(ref-24082-S06049554542001010400000). If voltage is not 3-6 volts, place timing switch in COMPUTED position and go to next step.
18. 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-24082-S37578241852001010400000).
19. 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-24082-S37578241852001010400000). If vehicle will not start, go to next step.
20. 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-24082-S37578241852001010400000).
21. 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-24082-S37578241852001010400000). If voltage is not 3-7 volts, go to next step.
22. 32) Check Resistance 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»(ref-24082-S37958038572001010400000). If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
23. 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).
24. 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-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000), step 1).
25. 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»(ref-24082-S13544258072001010400000), step 1).

CIRCUIT TEST B - EEC-V POWER RELAY

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

Scheme 5

1. Vehicle wiring harness circuits (VPWR, IGNITION START/RUN, B+ and Ground).
2. EEC-V power relay.
3. Constant Control Relay Module (CCRM).
4. Powertrain Control Module (PCM). (Scheme 5): EEC-V Power Relay Test Circuits

1. 1) Check VPWR Circuit Resistance 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. 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-24082-S37578241852001010400000) . If voltage is more than 10.5 volts, replace EEC-V power relay and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
3. 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 and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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).

Identifying Reference Voltage Circuits & Connector Terminals. Scheme 6

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

Scheme 7

Scheme 8

1. 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. 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. 3) Check Scan Tool Ability To Access Parameter Identification (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. 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 wiring harness connector and go to «CIRCUIT TEST B»(ref-24082-S26618069292001010400000). (Scheme 7): Identifying IAC Wiring Harness Connector Terminals
5. 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 or EVP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, proceed as follows: For models with Fuel Tank Pressure (FTP) sensor, go to next step. For models with A/C Pressure (ACP) sensor, go to step 7). For models with Power Steering Pressure (PSP) sensor, go to step 9). For models with Fuel Rail Pressure (FRP) sensor, go to step 10). For all other vehicles, go to step 15).
6. 6) Check For Shorted Fuel Tank Pressure (FTP) Sensor Leave DPFE and TP sensor disconnected. Disconnect FTP 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 FTP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, proceed as follows: For models with A/C Pressure (ACP) sensor, go to next step. For all other vehicles, go to step 15).
7. 7) Check For Shorted AC Pressure (ACP) Sensor Leave DPFE and TP sensor disconnected. Disconnect ACP 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 ACP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, proceed as follows: For models with Traction Assist, go to next step. For models without Traction Assist, go to step 15).
8. 8) Check For Shorted TP-B Sensor Disconnect Throttle Position sensor B (TP-B). Leave ACP, DPFE and TP sensor disconnected. 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 TP-B sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, go to step 15).
9. 9) Check For Shorted Power Steering Pressure (PSP) Sensor Leave DPFE and TP sensor disconnected. Disconnect PSP 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 PSP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, go to step 15).
10. 10) Check For Shorted Fuel Rail Pressure (FRP) Sensor Leave DPFE and TP sensor disconnected. Disconnect FPR 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 FPR sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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 10) to step 13). No test procedures have been omitted.
11. 13) Check For Shorted EGR Valve Position (EGRP) Sensor Leave TP sensor disconnected. Disconnect EGRP 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 EGRP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, go to next step.
12. 14) Check For Shorted EGR Boost (EGRB) Sensor Leave EGRP and TP sensor disconnected. Disconnect EGRB 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 EGRB sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage measurement is not 4-6 volts, go to next step.
13. 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.
14. 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-24082-S37578241852001010400000). If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 20) Check VREF Resistance 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-24082-S37578241852001010400000). If resistance is 5 ohms or more, repair open in VREF and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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.
16. 25) Check Scan Tool Ability To Access Parameter Identification (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).
17. 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.
18. 27) Check SIG RTN Circuit Resistance To 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-24082-S37578241852001010400000).
19. 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 is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
20. 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 circuits are okay. Return to step 25) to verify results. If any resistance is 5 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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.
21. 35) Check VREF Circuit For Short To Power Turn ignition off. Ensure sensor with failed VREF circuit is disconnected. Leave all components connected to VREF circuit disconnected. (Scheme 8) 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-24082-S37578241852001010400000). If voltage is 0.5 volt or more, repair VREF circuit for a short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). (Scheme 8): Identifying Components Connected To VREF Circuit

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

Scheme 9

Scheme 10

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. (Scheme 9): Identifying Throttle Position (TP) Sensor Connector Terminals (Scheme 10): Identifying Temperature Sensor Circuits & Connector Terminals

1. 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-24082-S37578241852001010400000). 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. 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 10) 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»(ref-24082-S14410186652001010400000).
3. 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 SPECIFICATIONS»(ref-24082-S38742422432001010400000) table. If resistance is not within specification, replace suspected sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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-24082-S37578241852001010400000). For diagnosing vehicles without a no-start condition, go to next step.
4. 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 table. If resistance is within specification, replace PCM, and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If sensor is not within specification replace sensor, and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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 V or IAT V PID. If the PID is less than 0.2 volt, replace sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If PID is 0.2 volt or more, remove jumper wire and go to next step.
6. 11) Check Resistance 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-24082-S37578241852001010400000). If either reading is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
7. 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-24082-S37578241852001010400000). If either resistance is less than 10,000 ohms, repair short circuit to VREF and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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 V of IAT V 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-24082-S37578241852001010400000).
9. 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»(ref-24082-S14410186652001010400000).
10. 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 No. 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-24082-S37578241852001010400000). If all readings are 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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. 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-24082-S37578241852001010400000). If no fault is found, go to step 92).
13. 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-24082-S37578241852001010400000). 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. 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-24082-S37578241852001010400000).

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

Scheme 11

Scheme 12

Scheme 13

1. EFT sensor.
2. Wiring harness circuits (EFT and SIG RTN).
3. Powertrain Control Module (PCM). (Scheme 11): Identifying EFT Connector Terminals (Scheme 12): Identifying Injector Pressure (IP) Sensor Connector Terminals (Scheme 13): Identifying Fuel Rail Components EFT 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 248 (120) 0.27 1180 (1) Values may vary by 15 percent.

1. 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-24082-S37578241852001010400000) . If PID is 0.2 volt or more, remove jumper wire and go to next step.
2. 2) Check Resistance 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-24082-S37578241852001010400000) . If either reading is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
3. 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-24082-S37578241852001010400000) . If either resistance is less than 10,000 ohms, repair short circuit to VREF and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
4. 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-24082-S37578241852001010400000) . If the PID is 4.2 volt or more, go to next step.
5. 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»(ref-24082-S14410186652001010400000) .
6. 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-24082-S37578241852001010400000) . If all readings are 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
7. 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. 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-24082-S37578241852001010400000) . If no fault is found, go to next step.
9. 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-24082-S37578241852001010400000) . 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

Scheme 14

1. Air cleaner element.
2. Inlet air duct.
3. Throttle body. (Scheme 14): Identifying MAF Sensor Circuits & Connector Terminals

1. 1) KOER DTC P1101: Check MAF Sensor Continuous Memory Codes DTC P1101, retrieved during KOER SELF-TEST, 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.
2. 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. 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. 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-24082-S37578241852001010400000) . If voltage does not go out of normal range, fault cannot be duplicated or identified at this time. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . 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. 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. 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. 8) Check Resistance 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-24082-S37578241852001010400000) .
8. 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-24082-S37578241852001010400000) .
9. 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-24082-S37578241852001010400000) .
10. 11) Check Resistance 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-24082-S37578241852001010400000) .
11. 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. 13) Check PWR GND Circuit Resistance 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-24082-S37578241852001010400000) .
13. 14) Check MAF RTN Circuit Resistance 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-24082-S37578241852001010400000) .
14. 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-24082-S37578241852001010400000) .
15. 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 is less than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
16. 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-24082-S37578241852001010400000) .
17. 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 is not 0.34-1.96 volts, replace MAF sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
18. 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»(ref-24082-S16577748702001010400000) . If voltage is not 0.34-1.96 volts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
19. 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. 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. 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-24082-S37578241852001010400000) . If resistance is 10,000 ohms or less, repair short between MAF SIG and VREF circuit. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 15

Scheme 16

Scheme 17

1. IP sensor.
2. Wiring harness circuits (IP and SIG RTN).
3. Powertrain Control Module (PCM). (Scheme 15): Identifying Fuel Rail Components (Scheme 16): Identifying Injection Pressure (IP) Sensor Test Circuits & Connector Terminals (Scheme 17): Identifying Fuel Rail Solenoid Connector Terminals IP SENSOR VOLTAGE-TO-FUEL PRESSURE CONVERSION CHART Voltage (DC) Pressure (psi) 4.5 150 4.1 140 3.7 130 3.3 120 2.9 110 2.5 100 2.1 90 1.7 80 1.3 70 0.9 60 0.5 50 0.1 40 0.0 37.5

1. 1) KOEO/KOER DTC P0192 DTC P0192 indicates IP voltage signal is less than self-test minimum. Possible causes for this fault are: IP signal is shorted to SIG RTN or PWR GND. IP circuit is open. Low fuel pressure. Faulty IP sensor. Faulty PCM. Ensure vehicle has fuel. With scan tester connected to DLC, turn ignition on. Using scan tester, access IP PID. If IP PID voltage is less than 0.2 volt, go to next step. If IP PID voltage is 0.2 volt or more, go to step 10).
2. 2) Turn ignition off. Disconnect IP wiring harness connector. Using jumper wire, connect IP terminal to VREF terminal. If scan tester communication problem is present, go to step 8). Using scan tester, access IP PID. If IP PID voltage is less than 4.5 volts, go to next step. If IP PID voltage is 4.5 volts or more, replace IP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
3. 3) Measure VREF Voltage With IP sensor disconnected, turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at IP 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»(ref-24082-S14410186652001010400000) .
4. 4) Check IP Circuit Resistance Turn ignition off. Leave IP 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 IP terminal of IP sensor wiring harness connector and test pin No. 63 (IP) 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-24082-S37578241852001010400000) .
5. 5) Check IP Circuit For Short To PWR GND Or SIG RTN Leave ignition off and IP sensor disconnected. Measure resistance between test pin No. 63 (IP) and test pins No. 91 (SIG RTN), 24 and 103 (PWR GND) at breakout box. If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
6. 6) KOEO/KOER DTC P0193 DTC P0193 indicates IP voltage signal is greater than self-test maximum. Possible causes for this fault are: IP signal is shorted to VREF or PWR. VREF circuit shorted to PWR. High fuel pressure. Faulty IP sensor. Faulty PCM. Turn ignition off. Release fuel pressure. Connect pressure gauge to schrader valve. With scan tester connected to DLC, turn ignition on. Using scan tester, access IP sensor pressure PID. If PID pressure is 140 psi or less, go to next step. If PID pressure is greater than 140 psi, go to «CIRCUIT TEST HB»(ref-24082-S20207374752002071600000) .
7. 7) KOEO/KOER DTC P0193 Possible causes for this fault are: IP signal is shorted to VREF or PWR. VREF circuit shorted to PWR. Faulty IP sensor. Faulty PCM. Turn ignition off. Disconnect IP sensor wiring harness connector. With scan tester connected to DLC, turn ignition on. Using scan tester, access IP PID. If IP PID voltage is less than 0.2 volt, replace IP sensor. If Continuous Memory DTC P0193 is present, go to step 10). If IP PID voltage is 0.2 volt or more, go to next step.
8. 8) Check IP Circuit For Short To VREF Or VPWR Leave ignition off and IP 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 test pin No. 63 (IP) and test pins No. 90 (VREF), 71 and 90 (VPWR) at breakout box. If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
9. 9) Measure VREF Voltage With IP sensor disconnected, turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at IP 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»(ref-24082-S14410186652001010400000) .
10. 10) Check IP Circuit For Short To PWR GND Or SIG RTN Leave ignition off and IP 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 test pin No. 63 (IP) and test pins No. 91 (SIG RTN), 24 and 103 (PWR GND) at breakout box. If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
11. 11) Check For Intermittent Fault Leave IP sensor wiring harness connector disconnected. With scan tester connected to DLC, turn ignition on. Using scan tester, access IP PID. Observe PID voltage for fault while tapping on IP sensor. Wiggle and bend wiring harness and connector between sensor and PCM. 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, symptom is intermittent and cannot be located at this time. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) for additional test procedure.
12. 12) KOEO/KOER DTC P0191 DTC P0191 indicates IP voltage signal is greater than self-test maximum. Possible causes for this fault are: High fuel pressure. Low fuel pressure. Excessive resistance in circuit. Faulty IP sensor. Low or no fuel. Ensure vehicle has fuel. With scan tester connected to DLC, turn ignition on. Turn ignition off. Release fuel pressure. Connect pressure gauge to schrader valve. Turn ignition on. Check fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to «CIRCUIT TEST HB»(ref-24082-S20207374752002071600000) .
13. 13) Check IP PID Fuel Pressure With scan tester connected to DLC, turn ignition on. Using scan tester, access IP PID. If IP PID psi reading is within 10 psi of fuel pressure gauge psi reading, go to next step. If IP PID psi reading is not as specified, repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
14. 14) Check Fuel Rail Solenoid Ensure scan tester is connected to DLC and ignition turned on. Using scan tester, access OUTPUT TEST MODE. While observing fuel rail solenoid, cycle output on and off several times. If solenoid clicking can be heard or felt, go to next step. In no solenoid response is observed, go to step 17).
15. 15) Measure VREF Voltage With IP sensor disconnected, turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at IP 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»(ref-24082-S14410186652001010400000) .
16. 16) Check IP Circuit For Excessive Resistance Turn ignition on. Disconnect IP sensor. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between IP terminal of IP sensor wiring harness connector and test pin No. 63 (IP) at breakout box. Measure resistance between SIG RTN terminal of IP sensor wiring harness connector and test pin No. 91 (SIG RTN) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
17. 17) Monitor IP Circuit With Scan Tester Turn ignition off. Disconnect IP sensor wiring harness connector. With scan tester connected to DLC, turn ignition on. Using scan tester, access IP PID. If IP PID voltage is less than 0.2 volt, replace IP sensor. If IP PID voltage is 0.2 volt or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
18. 18) Check Voltage At Fuel Rail Solenoid Ensure scan tester is connected to DLC and ignition turned on. Using scan tester, access OUTPUT TEST MODE and select ALL ON. Disconnect fuel rail solenoid wiring harness connector. Measure voltage between PWR circuit terminal and battery negative terminal. If voltage is 10.5 volts or more, replace solenoid and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is less than 10.5 volts, repair open in PWR circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 18

1. Wiring harness circuits (VSC SIG and VSC GND).
2. Powertrain Control Module (PCM). (Scheme 18): Identifying ABS Module VSC Connector Terminals

1. 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. 2) Check Circuit Resistance 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-24082-S37578241852001010400000) .
3. 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. 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. 5) Test Drive Vehicle Ensure engine is warmed to normal operating temperature. Perform the following drive cycle 3 times: A/T Equipped Vehicles Place gear selector in Drive. Accelerate heavily to 35 MPH. Coast down to idle speed and stop vehicle. M/T Equipped Vehicles Place gear selector in first gear. Accelerate heavily to 35 MPH, not shifting higher than second gear. Coast down to idle speed and stop vehicle. After third drive cycle, perform QUICK TEST. If any DTCs are present, go to appropriate CIRCUIT TEST. If DTCs are not present, testing is complete.

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

Scheme 19

Scheme 20

Scheme 21

1. Poor fuel quality.
2. Ignition system.
3. Ignition or valve timing.
4. Engine mechanical condition. (Scheme 19): Identifying Single KS Sensor Test Circuits & Connector Terminals (Scheme 20): Identifying Dual KS Sensor Test Circuits & Connector Terminals (Scheme 21): Identifying Quad KS Sensor Test Circuits & Connector Terminals

1. 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. 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-24082-S37578241852001010400000) .
3. 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-24082-S37578241852001010400000) . If AC voltage does not increase, go to next step.
4. 4) Check Circuit Resistance 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-24082-S37578241852001010400000) .
5. 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-24082-S37578241852001010400000) . If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
6. 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-24082-S37578241852001010400000) . If any voltage measurement is 0.5 volt or more, repair circuit short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
7. 7) Check PCM For Short To Ground Turn ignition off. Connect PCM to breakout box. Leave suspect sensor disconnected. Measure resistance between test pin No. 32 or 57 (KS) and test pin No. 91 (SIG RTN). If resistance measurement is 10,000 ohms or more, go to next step. If resistance measurement is less than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
8. 8) Check KS Resistance Leave ignition off. Disconnect PCM from breakout box. Measure resistance between test pin No. 32 or 57 (KS) and test pin No. 91 (SIG RTN) at breakout box. If resistance measurement is 5.11 megaohms or more, replace KS. Perform a complete drive cycle and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance measurement is less than 5.11 megaohm, replace KS and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If fault is still present, replace PCM.

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

Scheme 22

Scheme 23

1. Idle speed.
2. Binding throttle shaft or linkage.
3. TP sensor not seated. (Scheme 22): TP Sensor Schematic (Scheme 23): Identifying TP Sensor Circuit & Connector Terminals

1. 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 SELF-TEST»(ref-24082-S17000748712001010400000) and «KOER SELF-TEST»(ref-24082-S07955820122001010400000) . Check for DTC P1400. If DTC P1400 is present, service code and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If DTC P1400 is not present with DTC P1124, go to next step.
2. 2) Check For Binding Throttle Plate Inspect throttle body for binding. If throttle body is binding, check for binding throttle or cruise control linkage, vacuum line or harness interference. Repair as necessary, and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If no mechanical problem is found, go to step 8).
3. 3) DTC P1120: Check For Binding Throttle Plate DTC P1120 indicates TP sensor closed throttle position is less than 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-24082-S37578241852001010400000) . If no mechanical problem is found, go to next step.
4. 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 less than 0.49 volt, go to next step. If TP PID increase and decrease is gradual and smooth, go to step 20).
5. 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»(ref-24082-S14410186652001010400000) .
6. 6) Check TP Circuit Resistance 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. 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. 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. 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»(ref-24082-S14410186652001010400000) .
10. 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-24082-S37578241852001010400000) . If each resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
11. 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-24082-S37578241852001010400000) . 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. 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»(ref-24082-S14410186652001010400000) .
13. 13) Check TP Circuit Resistance 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. 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-24082-S37578241852001010400000) . If both resistances are 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
15. 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»(ref-24082-S15480378042001010400000) .
16. 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 less than 0.53 volt, or increases to more than 1.27 volts, replace TP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If TP PID increase and decrease is gradual and smooth, and within 0.53-1.27 volt range, go to next step.
17. 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. 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»(ref-24082-S15480378042001010400000) . 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-24082-S37578241852001010400000) . 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. 20) Continuous Memory Code P1120 Or P1125 Theses codes indicate TP signal went less than 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. 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»(ref-24082-S16577748702001010400000) . If DVOM reading goes out of range, isolate fault and repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
21. 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. 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»(ref-24082-S07955820122001010400000) . 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. 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-24082-S37578241852001010400000) . If continuity is not present, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 24

1. Wiring harness circuits (PSOM+ and PSOM-).
2. Powertrain Control Module (PCM). (Scheme 24): Identifying PSOM Test Circuits & Connector Terminals

1. 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. 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-24082-S37578241852001010400000) . If no blips are present, go to next step.
3. 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-24082-S37578241852001010400000) .
4. 4) Check Circuit Resistance 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-24082-S37578241852001010400000) .
5. 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 71. 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-24082-S37578241852001010400000) .

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

Scheme 25

1. Wiring harness circuits (MD and SIG RTN).
2. Faulty MD sensor.
3. Faulty Powertrain Control Module (PCM). (Scheme 25): Identifying MD Test Circuits & Connector Terminals

1. 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 has caused DTC P0385. Service or repair as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
2. 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»(ref-24082-S16577748702001010400000) . 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. 5) Check Circuit Resistance 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. 91 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-24082-S37578241852001010400000) .
4. 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-24082-S37578241852001010400000) .
5. 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. 51, 103 (PWR GND) and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If either resistance measurement is less than 10,000 ohms, repair circuit short and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
6. 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. 23 (IGN GND), 51, 103 (PWR GND), 71 and 97 (VPWR) and 91 (SIG RTN) 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-24082-S37578241852001010400000) .
7. 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-24082-S37578241852001010400000) . If AC voltage does not vary more than 0.1 volt, go to next step.
8. 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-24082-S37578241852001010400000) . If trigger wheel is okay, replace MD sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 26

1. Wiring harness circuits (CHT and SIG RTN).
2. Faulty CHT sensor.
3. Faulty Powertrain Control Module (PCM). (Scheme 26): Identifying CHT Test Circuits & Connector Terminals CHT SENSOR SPECIFICATIONS Temperature °F (°C) (1) Volts (1) Ohms 32 (0) 4.80 96,255 59 (15) 4.61 46,883 104 (40) 4.00 16,043 158 (70) 2.83 5268 185 (85) 2.22 3215 194 (90) 2.03 2750 212 (100) 1.68 2034 (1) Value may vary by 15 percent.

1. 1) DTC P1116 Or P1288 DTC P1116 or P1228 indicate 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-24082-S07955820122001010400000) . Check for DTC P1116 or P1288. If DTC P1116 or P1288 is not present, service remaining faults and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If DTC P1116 or P1288 is present, go to next step.
2. 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»(ref-24082-S14410186652001010400000) .
3. 3) Check CHT Sensor Circuit Resistance Turn ignition off. Disconnect CHT sensor. Measure resistance between CHT sensor terminals. See «CHT SENSOR SPECIFICATIONS»(ref-24082-S41905194502001010400000) table. If resistance is within specification, go to next step. If resistance is not within specification, replace sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
4. 4) Leave CHT sensor disconnected. Start engine and raise speed to 2000 RPM. Measure resistance between CHT sensor terminals. See «CHT SENSOR SPECIFICATIONS»(ref-24082-S41905194502001010400000) table. If resistance is within specification, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is not within specification, replace sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 10) DTC P1118 Or P1289 These codes indicate 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-24082-S37578241852001010400000) . 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. 11) Check Circuit Resistance Turn ignition off. Disconnect CHT sensor 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 between CHT sensor wiring harness connector terminal and test pin No. 66 at breakout box. Measure resistance of SIG RTN circuit between CHT sensor wiring harness connector terminal and test pin No. 91 at breakout box. If either resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
7. 12) Check Signal Short To VREF Turn ignition off. Disconnect CHT sensor 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 between test pins No. 66 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10,000 ohms or less, repair circuit short to VREF and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 20) DTC P0117 Or P1290 These codes indicate 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 is more than 4.6 volts, replace CHT sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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.
9. 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»(ref-24082-S14410186652001010400000) .
10. 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-24082-S37578241852001010400000) . If either resistance measurement is less than 10,000 ohms, repair circuit short and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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.
11. 30) DTC P1285 This code indicates that PCM has sensed engine overheat condition from CHT sensor. Check cooling system for leaks and restrictions. Repair or replace as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 30) to step 90). No test procedures have been omitted.
12. 90) Continuous Memory DTC P0117, P0118, P1117, 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-24082-S37578241852001010400000) . If no faults are indicated, go to next step.
13. 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.
14. 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-24082-S37578241852001010400000) . If fault is found, repair as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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.
15. 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-24082-S37578241852001010400000) .

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

Scheme 27

1. Vehicle Speed Sensor (VSS).
2. VSS wiring harness circuits. (VSS+ and VSS-).
3. Powertrain Control Module (PCM). (Scheme 27): Identifying VSS Circuit & Connector Terminals

1. 1) DTC P0500 Or P0501 These codes indicate 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. 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. 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. 58 and test pins No. 24, 51, 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. 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. 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. 6) Check VPWR To VSS Turn ignition off. Disconnect VSS wiring harness connector. Turn ignition on. Measure voltage at connector as follows: Between VPWR terminal and PWR GND terminal. Measure resistance as follows: 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. 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 1.0 volt or more, repair short to power and go to step 27). If voltage is less than 1.0 volt, go to next step.
7. 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. 9) Check VSS Circuit Resistance 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. 10) Check VSS Ground Circuit Resistance 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. 15) KOER DTC P1501: 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 is 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. 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. 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. 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. 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 are found, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . If faults are 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. 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-24082-S37578241852001010400000) . 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-24082-S37578241852001010400000) . 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

Scheme 28

1. CID, PWR GND, SIG RTN and VPWR wiring harness circuits.
2. Faulty Camshaft Position (CMP) sensor.
3. Faulty Powertrain Control Module (PCM). (Scheme 28): Identifying CMP Test Circuit & Connector Terminals

1. 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»(ref-24082-S15480378042001010400000) .
2. 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 to retrieve Continuous Memory DTCs. If DTC P0340 is not present, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . If DTC P0340 is present, go to next step for Hall Type CMP or step 5) for Variable Reluctance Type CMP.
3. 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 is less than 10.5 volts, repair open in VREF circuit. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
4. 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-24082-S37578241852001010400000) .
5. 5) Check Resistance 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. Also measure resistance as follows: Between test pin No. 76 and CMP TSS GND 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-24082-S37578241852001010400000) .
6. 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-24082-S37578241852001010400000) .
7. 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-24082-S37578241852001010400000) .
8. 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-24082-S37578241852001010400000) .
9. 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-24082-S37578241852001010400000) . If voltage does not vary more than 0.1 volt, replace CMP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
10. 10) Check CMP Sensor Output Turn ignition off. Disconnect PCM. Ensure CMP sensor is installed properly. 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 less than 2 volts to more than 8 volts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage does not switch as specified, replace CMP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 29

1. PSP sensor.
2. PSP, SIG RTN and VREF wiring harness circuits.
3. Powertrain Control Module (PCM). (Scheme 29): Identifying PSP Sensor Test Circuit & Connector Terminals

1. 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-24082-S37578241852001010400000) .
2. 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»(ref-24082-S14410186652001010400000) .
3. 3) Check PSP Sensor Circuit Resistance 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-24082-S37578241852001010400000) .
4. 4) 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, go to next step. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
5. 5) 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. Replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage does not change from 0.5-4.5 volts, replace PSP sensor. Remove breakout box and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 30

1. PTO wiring harness circuit.
2. Powertrain Control Module (PCM). (Scheme 30): Identifying PT0 Test Circuit & Switch Schematic

1. 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-24082-S37578241852001010400000) .
2. 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-24082-S37578241852001010400000) . If voltage is one volt or more, repair circuit short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
3. 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. 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. 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. 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-24082-S37578241852001010400000) . If resistance is 10,000 ohms or less, repair PTO circuit short to chassis ground and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
7. 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. 8) Check Circuit Resistance 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-24082-S37578241852001010400000) . If resistance is 5 ohms or more, repair open in PTO circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
9. 9) Perform «KOEO SELF-TEST»(ref-24082-S17000748712001010400000) and «KOER SELF-TEST»(ref-24082-S07955820122001010400000) . If any DTCs are present, repair as necessary. If no DTCs are present, go to next step.
10. 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»(ref-24082-S16577748702001010400000) .

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

Scheme 31

1. Brakelight bulb.
2. Brakelight switch or brakelight fuse. (Scheme 31): BOO Switch Circuit

1. 1) DTC P1703: Verify Brake Pedal Was Depressed This code indicates that when brake pedal is applied during KOER SELF-TEST, 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, repeat test. Depress and release brake pedal only once during test. If pedal was depressed, go to next step.
2. 2) DTC P1703 This code indicates that voltage was present at BOO circuit during KOEO SELF-TEST. 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. 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. 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»(ref-24082-S16577748702001010400000) .
5. 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-24082-S37578241852001010400000) .
6. 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-24082-S37578241852001010400000) . If resistance is less than 5 ohms, repair open circuit between switch and stoplight ground and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
7. 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-24082-S37578241852001010400000) .
8. 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-24082-S37578241852001010400000) .
9. 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, ABS module and Generic Electronic Module (if equipped). Turn ignition on. If brakelights are still on, repair short to power in BOO circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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»(ref-24082-S37578241852001010400000) .
10. 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-24082-S37578241852001010400000) . 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, CIRCUIT TEST S 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 Application Switch Position Voltage Blower Motor 1 Or 2 10-17 3 Or 4 Less Than 1.5 Daytime Running Lights Off 10-17 On Less Than 1.5 Headlights Off Less Than 1.5 On 10-17 Rear Window Defroster Off 10-17 On Less Than 3.0

1. 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. 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. 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. 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. 13) Check Blower Circuit Resistance 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. 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. 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. 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. 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. 23) Check DRL Circuit Resistance 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. 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 91 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. 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. 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. 32) Check HDL Circuit Resistance 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. 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. 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. 40) Check Rear Window Defroster Turn ignition off. Disconnect rear window defroster coil connector. Turn ignition on. Using DVOM, measure voltage between coil connector and defroster coil. If voltage is 10-127 volts when defroster on and less than one volt with defroster off, go to next step. If voltage is not as specified, repair rear window defroster.
18. 41) 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 is 10-17 volts, go to next step. If voltage is not 10-17 volts, go to step 44).
19. 42) 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.
20. 43) 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.
21. 44) Check DEF Circuit Resistance 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.
22. 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

Scheme 32

1. Wiring harness circuits (SIG RTN and PSP).
2. PSP switch.
3. Powertrain Control Module (PCM). (Scheme 32): Identifying PSP Test Circuit & Connector Terminals

1. 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»(ref-24082-S16577748702001010400000) .
2. 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-24082-S37578241852001010400000) . If engine speed does not increase when switch is disconnected, go to next step.
3. 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 is disconnected, replace switch and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If engine speed does not increase when switch is disconnected, go to next step.
4. 4) Check PSP Circuit Resistance 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. 31 (PSP) at breakout box and PSP terminal of PSP switch connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of PSP switch connector. If both resistance measurement are less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
5. 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 next step 7). If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
6. 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 10 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10 ohms or more, replace PSP switch and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
7. 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 10 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10 ohms or more, replace PSP switch and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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 33

Octane Adjust Circuit. Scheme 34

1. 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. 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 article in this section. If vehicle does not have modification decal, go to next step.
3. 3) Check For DTC P1390 Replace OCT ADJ shorting bar. Perform «KOEO SELF-TEST»(ref-24082-S17000748712001010400000) . 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 article in this section.
4. 4) Check Octane Adjust Circuit Resistance 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-24082-S37578241852001010400000) . If resistance is 5 ohms or more, repair open OCT ADJ circuit, shorting bar or SIG RTN circuit. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
5. 5) Check For DTC P1390 Start engine. Warm it to normal operating temperature. Turn ignition off. Perform «KOEO SELF-TEST»(ref-24082-S17000748712001010400000) . If DTC P1390 is not present, go to next step. If DTC P1390 is present, return to step 1).
6. 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. 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 article in this section.
8. 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 is detonating, go to TESTS W/O CODES article in this section.
9. 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. 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 article in this section.
11. 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 article in this section.

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

Scheme 35

Scheme 36

Scheme 37

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 Acronym Definition DLC Data Link Connector HO2S Heated Oxygen Sensor PID Parameter Identification (Scheme 35): Identifying HO2S Connector Terminal (Scheme 36): Identifying Fuel Injector Connector Terminals (Scheme 37): Locating HO2S (4-Cylinder) HO2S TEST PIN IDENTIFICATION (1) HO2S Pin No. HO2S SIG HO2S HTR 11 60 93 12 35 95 21 87 94 22 61 96 (1) SIG RTN is test pin No. 91. VPWR is test pin No. 71 and 97. NOTE: Test procedure begins with step 20). No test procedures have been omitted.

1. 20) Perform KOER SELF-TEST If DTC P1127, P1128 or P1129 are present, service before proceeding. If specified DTCs are not present, go to next step.
2. 21) DTC P0133 & P0153 This code indicates that response rate is below calibration in HO2S as follows: DTC P0133 for right front (or front, except V8) HO2S. DTC P0153 for left front (or rear, except V8) 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 Diagnostic Monitoring Test Results and enter. Scroll to Test ID: 01 and enter. Press Start. If measured value is 614 or more, fault cannot be duplicated or identified at this time and testing is complete. If measurement fault is less than 614, go to next step.
3. 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-24082-S37578241852001010400000) . If none of these conditions are present, go to next step.
4. 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-24082-S37578241852001010400000) . If none of these conditions are present, go to next step.
5. 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-24082-S37578241852001010400000) .
6. 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-24082-S37578241852001010400000) . If each resistance is less than 5 ohms, go to next step.
7. 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 is less than 10,000 ohms, repair short circuit. Drive vehicle for 5 miles at 55 MPH and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If each resistance is 10,000 ohms or more, replace PCM.
8. 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. 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-24082-S37578241852001010400000) . If resistance is 5 ohms or more, repair circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 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. 31) Perform KOEO SELF-TEST Start engine and operate at 2000 RPM for 5 minutes. Turn ignition off. Perform «KOEO SELF-TEST»(ref-24082-S17000748712001010400000) . If DTC P0135, P0141, P0155 or P0161 are present, go to next step. If specified DTCs are not present, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) .
12. 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. 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-24082-S37578241852001010400000) .
14. 34) Check HO2S Heater Resistance 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-24082-S37578241852001010400000) .
15. 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-24082-S37578241852001010400000) .
16. 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, 91, 97 and 103. DTC P0141 (RR), test pin No. 95 and test pins No. 24, 91, 97 and 103. DTC P0155 (LR), test pin No. 94 and test pins No. 24, 91, 97 and 103. DTC P0161 (LR), test pin No. 96 and test pins No. 24, 91, 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-24082-S37578241852001010400000) .
17. 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-24082-S37578241852001010400000) . If resistance is less than 4 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 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. 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. 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.
20. 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-24082-S07955820122001010400000) and proceed as follows: If DTCs P1127, P1128 or P1129 are present, go to appropriate CIRCUIT TEST. If DTCs P0131 or P0151 are present in continuous memory, go to step 27). If DTCs P1131, P1130 or P1151, P1150 are present, go to step 43). If DTCs P1130, P1132 or P1150, P1152 are present, go to step 49). If none of these DTCs are present, proceed as follows: If diagnosing DTCs P1130, P1150, P1171, P1172, P1174 or P1175, go to step 52). If diagnosing DTCs P1132 or P1152, go to «CIRCUIT TEST HW»(ref-24082-S18067495952001010400000) , step 13). If diagnosing any other DTCs, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) .
21. 43) Disconnect suspect HO2S. Turn ignition on. Using scan tool, access HO2S PID of suspect sensor. Connect jumper wire between HO2S SIG and VPWR circuit at HO2S harness connector. If spark occurs, remove jumper wire and go to step 47). If HO2S voltage is more than 1.3 volts, go to next step. If voltage is 1.3 volts or less, go to step 46).
22. 44) Check Circuit Resistance Turn ignition off. Connect PCM to breakout box. Measure resistance between battery ground terminal and SIG RTN terminal of HO2S harness connector. If resistance is less than 5 ohms, go to step 52). If resistance is 5 ohms or more, go to next step.
23. 45) Turn ignition off. Disconnect PCM from breakout box. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of HO2S harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
24. 46) Check Resistance 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. If resistance is less than 5 ohms, go to next step. If any resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
25. 47) 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, 77, 91 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-24082-S37578241852001010400000) .
26. 48) Check HO2S For Short To Ground Ensure ignition is off and PCM is disconnected. Reconnect HO2S to wiring harness connector. Measure resistance between HO2S SIG RTN test pin and test pin No. 91 at breakout box. If resistance measurement is less than 10,000 ohms, replace HO2S and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10,000 ohms or more, replace PCM.
27. 49) Check HO2S PID Leave ignition off and HO2S disconnected. Turn ignition on. Using scan tool, access HO2S PID of suspect sensor. If HO2S PID voltage is more than 0.2 volts, go to next step. If HO2S voltage is 0.2 volts or less, go to step 51).
28. 50) Check For Short To Power Turn ignition off. Disconnect scan tester from DLC (if applicable). 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, 93 and 97. DTC P01150 and P01152; test pin No. 87 and test pins No. 71, 94 and 97. If each resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If any resistance is 10,000 ohms or less, repair short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
29. 51) Turn ignition off. Disconnect suspect HO2S. Turn ignition on. Using scan tool, access HO2S PID of suspect sensor. If HO2S voltage is more than 0.45 volts, replace HO2S and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.45 volts or less, go to next step.
30. 52) 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-123323) article. If fuel system pressure is as specified, go to next step. If fuel system pressure is not as specified, go to «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000) .
31. 53) 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 4) under «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000) . 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 55). For DTCs P1130, P01150, P0171, P0172, P0174 and P0175, go to step 54). For HO2S DTCs displayed with misfire DTCs, go to step 56). For all other DTCs, go to step 60).
32. 54) 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 56). If fuel pressure drops more than 5 psi, go to step 58).
33. 55) 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, reconnect IFS switch and go to next step. If fuel pressure drops more than 5 psi (34 kPa), repair fuel system as necessary. See FUEL SYSTEM in SYSTEM/COMPONENT TESTS article in this section.
34. 56) 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-24082-S13487689672001010400000) table. Resistance should be 11-18 ohms. If resistance is not correct, go to next step. If resistance is correct, go to step 59). FUEL INJECTOR INJ CIRCUIT IDENTIFICATION Injector No. Test Pin No. 1 75 2 101 3 74 4 100 5 (1) 73 6 (1) 99 7 (1) 72 8 (1) 98 9 (1) 68 10 (1) 42 (1) If equipped.
35. 57) Check Resistance 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. and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
36. 58) 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, 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-24082-S37578241852001010400000) .
37. 59) 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-24082-S37578241852001010400000) .
38. 60) 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-24082-S37578241852001010400000) . If flow rate for each fuel injector is okay, proceed as follows: For DTCs P0171, P0174, P1130, P1131, P1151 and P1150, go to step 62). For DTCs P1132 and P1152, go to step 65). For DTCs P1172 and P1175, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 60) to step 62). Test procedure applicable only to vehicles with Secondary Air Injection System was omitted.
39. 62) Check Induction System For Air Leaks Check air induction system for leaks or restrictions. Check PCV system for leaks or restrictions. Check vacuum hoses for damage and tight connection. Repair or replace as necessary. If no faults are found, go to next step.
40. 63) 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-24082-S37578241852001010400000) . If compression is okay, go to next step (DTCs P1130, P1150, P1131 and P1151) or step 65) (DTCs P1132 and P1152). If misfire DTCs are displayed with fuel control DTCs, go to «CIRCUIT TEST HD»(ref-24082-S08894339852001010400000) , step 20).
41. 64) 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 3 minutes. Turn ignition off. Connect scan tool to DLC. Perform «KOER SELF-TEST»(ref-24082-S07955820122001010400000) while monitoring HO2S voltage. If HO2S voltage is 0.5 volt or more at the end of test, go to step 70). If voltage is less than 0.5 volt, replace HO2S sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
42. 65) Perform KOER SELF-TEST Start engine, and warm it to normal operating temperature. Turn ignition off. Disconnect suspect HO2S. Using a jumper wire, connect HO2S terminal of wiring harness connector to negative battery terminal. Perform «KOER SELF-TEST»(ref-24082-S07955820122001010400000) . 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-24082-S37578241852001010400000) .
43. 66) 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-24082-S37578241852001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 66) to step 70). No test procedures have been omitted.
44. 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.
45. 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-24082-S37578241852001010400000) . 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.
46. 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. If DTC P0136/P0156 is present, go to next step. If DTC P0136/P0156 is not present, go to step 82). 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.
47. 81) Perform KOER SELF-TEST Start engine, and operate at 2000 RPM for 3 minutes. With scan tester connected, perform «KOER SELF-TEST»(ref-24082-S07955820122001010400000) . If DTCs P1137 P1138, P1157 or P1158 are present, go to next step. If specified DTCs are not present, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) .
48. 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 or replace as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If not faults are present, go to next step.
49. 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, 71, 90 (VREF), 91 (SIG RTN), 97 (VPWR), and 103 (PWR GND) 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-24082-S37578241852001010400000) .
50. 84) Check Ground Circuit Resistance 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-24082-S37578241852001010400000) . If resistance is less than 5 ohms, go to next step.
51. 85) Check HO2S Circuit 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.
52. 86) Check Circuit Resistance Turn ignition off. Connect PCM to breakout box. Measure resistance between PWR GND test pin and SIG RTN test pin at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
53. 87) Check HO2S PID Leave ignition off and HO2S disconnected. Using jumper wire, connect VPWR and HO2S signal terminal of 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. Clear PCM memory. Drive vehicle for 5 miles and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If HO2S PID voltage is 1.5 volts or less, replace PCM. Clear PCM memory. Drive vehicle for 5 miles and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
54. 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-24082-S37578241852001010400000) . If voltage is less than 1.5 volts, replace HO2S and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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.
55. 100) KOER DTC P0127 DTC P0127 indicates that HO2S heater was not on during KOER SELF-TEST 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-24082-S37578241852001010400000) . If any PIDs are off, operate engine until all PIDs are on; repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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.
56. 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-24082-S07955820122001010400000) . If no faults are found, go to next step.
57. 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-24082-S37578241852001010400000) 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»(ref-24082-S37578241852001010400000) .

CIRCUIT TEST HA - NATURAL GAS FUEL CONTROL

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

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

1. HO2S heater.
2. Engine vacuum systems.
3. Natural Gas (NG) module.
4. Fuel injector.
5. Wiring harness connector and circuits (HO2S HTR, INJ 1-8, VPWR & SIG RTN).
6. Powertrain Control Module (PCM).

HO2S TEST PIN IDENTIFICATION (1)

Note. HO2S may be displayed on scan tool as O2S.

Identifying NG Module Circuits & Connector Terminals. Scheme 38

Identifying HO2S Connector Terminals. Scheme 39

Identifying FTP Connector Terminals. Scheme 40

Note. Test procedure begins with step 30). No test procedures have been omitted.

1. 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 volts. DTC P0135 for right front HO2S. DTC P0141 for right rear HO2S. DTC P0155 for left front HO2S. DTC P0161 for left rear HO2S. Possible causes are: Signal shorted in wiring harness or HO2S. Water in connectors. Cut or pulled wires. Low battery voltage. Open in GND or VPWR circuit. Ensure battery is fully charged. Inspect HO2S connectors for loose, damaged or corroded terminals. Repair as necessary. If HO2S connectors are okay, go to next step.
2. 31) Perform KOEO Self-Test Start engine and operate at 2000 RPM for 5 minutes. Turn ignition off. Perform KOEO ON-DEMAND SELF-TEST. If DTC P0135, P0141, P0155 or P0161 are present, go to next step. If specified DTCs are not present, fault may be intermittent. Go to CIRCUIT TEST Z.
3. 32) Check For Voltage At HO2S Heater Wiring Harness Connector Turn ignition off. Disconnect suspect HO2S connector. Turn ignition on. Measure voltage between SIG RTN and VPWR terminals 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).
4. 33) Check For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between VPWR terminal at HO2S wiring harness connector and test pin No. 71 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 VPWR circuit.
5. 34) Check HO2S Heater Circuit Turn ignition off. Measure resistance between HO2S HEATER GND terminal and VPWR terminal at HO2S. If resistance is 3-30 ohms, go to next step. If resistance is not 3-30 ohms, replace HO2S sensor.
6. 35) Check For HO2S Case Short Measure resistance between HO2S HEATER GND terminal at HO2S and HO2S case. Also, measure resistance between VPWR terminal at HO2S and HO2S case. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance is 10,000 ohms or less, replace HO2S.
7. 36) Check For Short Circuit Disconnect scan tool from DLC. Measure resistance between test pins at breakout box as follows: DTC P0135 (RF), test pin No. 93 and test pins No. 24, 71, 91 and 103. DTC P0141 (RR), test pin No. 95 and test pins No. 24, 71, 91 and 103. DTC P0155 (LF), test pin No. 94 and test pins No. 24, 71, 91 and 103. DTC P0161 (LR), test pin No. 96 and test pins No. 24, 71, 91 and 103. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
8. 37) Check For Open Circuit Measure resistance between HO2S HEATER GND terminal at suspect HO2S wiring harness connector and appropriate test pin at breakout box as follows: Right front HO2S; test pin No. 93. Left front HO2S; test pin No. 94. Right rear HO2S; test pin No. 95. Left rear HO2S; test pin No. 96. If resistance is 4 ohms or more, repair open circuit or excessive resistance in HO2S wiring harness. If resistance is less than 4 ohms, wiring harness is okay. Replace PCM. 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.
9. 40) DTC P1130, P1131, P1132, P1150, P1151 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: Fuel system malfunction. Secondary ignition system malfunction. Air intake or vacuum system leak. Exhaust leak near HO2S. Incorrect cam timing. Restricted air cleaner. Excessive internal engine wear. Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to step 42).
10. 41) DTC P0171, P0172, P0174 Or P0175 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: Fuel system malfunction. Secondary ignition system malfunction. Air intake or vacuum system leak. Exhaust leak near HO2S. Incorrect cam timing. Restricted air cleaner. Excessive internal engine wear. Ran out of fuel. Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to next step.
11. 42) Perform KOER Self-Test Perform KOER ON-DEMAND SELF-TEST and proceed as follows: If DTC P0131, P0132, P0151 or P0152 is present, go to next step. If none of these DTCs are present, proceed as follows: If diagnosing DTC P1130, P1150, P1171, P1172, P1174 or P1175, go to next step. If diagnosing any other DTCs, fault may be intermittent. Go to CIRCUIT TEST Z.
12. 43) Check Fuel Pressure Turn ignition off. Connect fuel pressure gauge to Schrader valve located on fuel rail. Observe fuel pressure gauge. Turn ignition on and note fuel pressure reading. Start engine and allow to idle. Note fuel pressure reading. Increase engine speed to 2500 RPM for one minute. Note fuel pressure reading. If fuel pressure readings are 80-120 psi (552-827 kPa), go to next step. If fuel pressure readings are not 80-120 psi (552-827 kPa), go to «CIRCUIT TEST HB»(ref-24082-S20207374752002071600000) .
13. 44) Check System Ability To Hold Fuel Pressure With fuel pressure gauge installed, cycle ignition from OFF to ON position 2 times to pressurize fuel system (DO NOT start engine). If fuel pressure does not remain within 10 psi (69 kPa) of pressure reading for at least 2 minutes, go to «CIRCUIT TEST HB»(ref-24082-S20207374752002071600000) . If fuel pressure remains within 10 psi (69 kPa) of highest fuel pressure reading for 2 minutes, proceed as follows: For no-start vehicles, go to next step. For DTCs P1130, P1150, P0171 P0172, P0174 and P0175, go to next step. For all other DTCs, go to step 62).
14. 45) Check For Fuel System Stability With fuel pressure gauge installed, cycle ignition from OFF to ON (DO NOT start engine). Note fuel pressure. If fuel pressure drops more than 10 psi within 10 seconds, go to step 57). If fuel pressure remains within 10 psi of original pressure for at least 10 seconds, proceed as follows: For no-start vehicles, go to next step. For DTCs P1130, P1150, P0171 and P0174, go to step 56). For all other DTCs, go to step 57).
15. 46) Check Ability Of Injectors To Deliver Fuel With fuel pressure gauge installed, cycle ignition from OFF to ON position 2 times to pressurize fuel system (DO NOT start engine). Note fuel pressure. Disconnect Inertia Fuel Shutoff (IFS) switch. Crank engine for 10 seconds. If fuel pressure remains within 20 psi (137 kPa) of original pressure, remove fuel pressure gauge and reconnect IFS switch. Go to next step. If fuel pressure drops more than 20 psi (137 kPa), repair fuel system as necessary.
16. 47) Check For VREF At NG Module Turn ignition off. Disconnect NG module 60-pin connector. See NATURAL GAS MODULE LOCATION table. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install 60-pin Breakout Box (014-00322). Connect NG module to breakout box. Turn ignition on. Measure voltage between test pins No. 26 (VREF) and 46 (SIG RTN) at breakout box. If voltage is 4-6 volts, go to step 56). If voltage is not 4-6 volts, go to next step. NATURAL GAS MODULE LOCATION Application Location Van In Left Side Of Engine Compartment, On Inner Fender
17. 48) Verify Voltage Reading If voltage in step 47) was less than less than 4 volts, go to next step. If voltage was more than 6 volts, go to step 54).
18. 49) Check Battery Voltage Turn ignition on. Measure voltage across battery terminals. If voltage is 10.5 volts or less, check charging system and battery. Repair as necessary. If voltage is more than 10.5 volts, go to next step.
19. 50) Check For Power At NG Module Measure voltage between test pins 57 and 60 at breakout box. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step 53).
20. 51) Check VPWR Voltage Measure voltage between negative battery terminal and test pin No. 57 at breakout box. If voltage is 10.5 volts or less, repair open in VPWR circuit. If voltage is more than 10.5 volts, go to next step.
21. 52) Check For Open Circuit Turn ignition off. Disconnect NG module from breakout box. Measure resistance between negative battery terminal and test pins No. 40 or 60 at breakout box. If resistance is 5 ohms or more, repair open in ground circuit. If resistance is less than 5 ohms, go to next step.
22. 53) Check Voltage To Fuel Tank Pressure Sensor Turn ignition off. Disconnect Fuel Tank Pressure (FTP) sensor connector. See FUEL TANK PRESSURE SENSOR LOCATION table. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at FTP sensor wiring harness connector. If voltage is 4-6 volts, replace FTP sensor. If voltage is not 4-6 volts, go to next step. FUEL TANK PRESSURE SENSOR LOCATION Application Location Van Under Left Center Of Vehicle
23. 54) Check For VREF Short To Power Ensure NG module is disconnected. Turn ignition on. Measure voltage between test pins No. 26 and 60 at breakout box. If voltage is less than one volt, replace NG module. If voltage is one volt or more, repair VREF circuit short to power.
24. 55) Check For VREF Short To Ground Turn ignition off. Disconnect NG module from breakout box. Measure resistance between test pin No. 26 (VREF) and test pins No. 40, 46 and 60 at breakout box. If all resistance readings are more than 10,000 ohms, replace NG module. If any resistance reading is 10,000 ohms or less, repair short to ground.
25. 56) Check Resistance Of Injectors & Related Circuits Leave ignition off and NG module disconnected. Measure resistance between suspect fuel injector test pin and test pin No. 37 or 57 at breakout box. See INJECTOR TEST PIN IDENTIFICATION table. If resistance is 3-6 ohms, go to step 59). If resistance is not 3-6 ohms, go to next step. INJECTOR TEST PIN IDENTIFICATION Cylinder No. Test Pin No. 1 58 2 59 3 39 4 35 5 33 6 42 7 53 8 54
26. 57) Check Fuel Injector Harness Resistance Disconnect suspect fuel injector connector. Measure resistance of fuel injector circuit between suspect fuel injector test pin at breakout box and appropriate fuel injector wiring harness connector. See «INJECTOR TEST PIN IDENTIFICATION»(ref-24082-S25063717652002062000000) . Also, measure resistance between test pin No. 37 or 57 at breakout box and Red wire at suspect fuel injector wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
27. 58) Check Injector Harness For Short To Power Or Ground Disconnect scan tool from DLC. Ensure suspect fuel injector is disconnected. Measure resistance between suspect fuel injector test pin and test pins No. 37, 57, 40 and 60 at breakout box. If any resistance reading is 10,000 ohms or less, repair short circuit. If all resistance readings are more than 10,000 ohms, go to step 61) if DTC P0172 or P0175 is present or replace damaged injector(s) if DTC P0172 or P0175 is not present.
28. 59) Check Injector Driver Signal At NG Module Ensure ignition is off. Connect NG module to breakout box. While cranking engine, connect test light between test pin No. 37 or 57 and injector test pins No. 33, 35, 39, 42, 53, 54, 58 and 59 at breakout box. If test light does not glow dimly (no light or continuous bright light) while cranking or running engine, go to next step. If test light glows dimly, PCM and NG module circuits are okay. If vehicle is a no-start, go to TESTS W/O CODES - 5.4L CNG article. If vehicle starts, go to step 63).
29. 60) Check PCM Injector Harness Circuit Ensure ignition is off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Disconnect NG module from 60-pin breakout box. Measure resistance between test pin No. 71 at 104-pin breakout box and test pin No. 37 or 57 at 60-pin breakout box. Also, measure resistance of PCM outputs to NG module between 104-pin breakout box and 60-pin breakout box. See PCM OUTPUT TO NG INPUT TEST PINS table. If all resistance reading are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit. PCM OUTPUT TO NG MODULE INPUT TEST PINS Cylinder No. PCM Test Pin No. NG Module Test Pin No. 1 75 3 2 101 4 3 74 5 4 100 23 5 73 24 6 99 25 7 72 43 8 98 44
30. 61) Check PCM Injector Harness For Short Circuit Measure resistance between NG module test pins (No. 3, 4, 5, 23, 24, 25, 43 and 44) and NG module test pins No. 37, 40, 57 and 60 at 60-pin breakout box. See «PCM OUTPUT TO NG MODULE INPUT TEST PINS»(ref-24082-S30719062832002071600000) . Also, measure resistance between PCM injector test pins (No. 75, 101, 74, 100, 73, 99, 72 and 98) and test pins No. 24, 25, 71, 76 and 103 at 104-pin breakout box. See «PCM OUTPUT TO NG MODULE INPUT TEST PINS»(ref-24082-S30719062832002071600000) . If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
31. 62) Check Injector Driver Signal At PCM Ensure ignition is off. Connect PCM to 104-pin breakout box. While cranking engine, connect test light between test pin No. 71 and injector test pins No. 72, 73, 74, 75, 98, 99, 100 and 101 at 104-pin breakout box. If test light glows dimly while cranking and engine will not start, replace NG module. If test light glows dimly while cranking or running engine, go to next step. If test light does not glow dimly while cranking or running engine, replace PCM.
32. 63) Check Fuel Injector Flow & Leakage Turn ignition off. Remove breakout boxes. Reconnect all connectors. Use Rotunda injector tester from Fuel Tester Kit (113-00114) to flow test fuel injectors. Follow injector tester instructions. If fuel injector flow or leakage rate is not okay, replace defective fuel injector(s). If flow rate for each fuel injector is okay, proceed as follows: For DTCs P0171, P0172, P0174 and P0175, fault is intermittent. Go to CIRCUIT TEST Z. For DTCs P1130 and P1150, go to step 65). For all other DTCs, go to next step.
33. 64) Check Cylinder Compression Using compression gauge, check cylinder compression. If cylinder compression is not okay, repair engine as necessary. If compression is okay, go to next step (DTCs P1130, P1131, P1150 and P1151) or step 70) (DTCs P1132 and P1152).
34. 65) Check HO2S Integrity DTCs P1130, P1150, P1131, and P1151 indicate HO2S switches slow or doesn't switch, is always lean or fuel is at adaptive limit. Possible causes are: Moisture inside HO2S causing short to ground. HO2S coated with contaminates. HO2S circuit open or shorted to ground. Turn ignition off. Inspect HO2S and wiring harness for damage and contamination from oil, water, etc. Repair as necessary. If no visible problems are found, start engine and operate at 2000 RPM for 2 minutes. Turn ignition off. Using scan tool, perform KOER ON-DEMAND SELF-TEST. If DTC P1131 or P1151 is present, go to next step. If DTC P1131 or P1151 is not present, HO2S system is functioning properly at this time. Faults cannot be duplicated or identified. Testing is complete.
35. 66) Check HO2S Ability To Generate Correct Voltage Turn ignition off. Disconnect suspect HO2S connector. Using DVOM, measure voltage between HO2S SIG terminal and SIG RTN terminal at HO2S wiring harness connector. Start engine and operate at 2000 RPM for 2 minutes. Perform KOER ON-DEMAND SELF-TEST while monitoring voltage. If voltage is more than .5 volt during or at end of test, go to next step. If voltage stays at .5 volt or less during test, replace HO2S sensor.
36. 67) Check Resistance Of HO2S Ground Circuits Turn ignition off. Install breakout box, leaving PCM disconnected. Disconnect suspect HO2S connector. Inspect both ends of connector for loose, damaged or corroded terminals. Repair as necessary. Measure resistance between appropriate HO2S SIG test pin at breakout box and HO2S SIGNAL terminal at HO2S wiring harness connector. Left Front HO2S; test pin No. 87. Right Front HO2S; test pin No. 60. Also, measure resistance between test pin No. 91 at breakout box and SIG RTN terminal at HO2S wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
37. 68) Check HO2S Circuit For Short To Ground Measure resistance between appropriate HO2S SIG circuit test pin and test pins No. 91 and 103 at breakout box. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short to ground.
38. 69) Check HO2S For Short To Ground Reconnect HO2S connector. Measure resistance between appropriate HO2S SIG RTN test pin and test pins No. 91 and 103 at breakout box. If any resistance reading is 10,000 ohms or less, replace HO2S. If both resistance readings are more than is 10,000 ohms, proceed as follows: For DTCs P1130 and P1150, go to next step. For Continuous Memory DTCs P1131 and P1151, go to step 75). For KOER DTCs P1131 and P1151, replace PCM.
39. 70) Perform KOER Self-Test Start engine, and warm it to normal operating temperature. With scan tool connected, perform KOER ON-DEMAND SELF-TEST. If DTC P1132 or P1152 is present, go to next step. If DTC P1132 or P1152 is not present, fault is intermittent. Go to CIRCUIT TEST Z.
40. 71) Check For HO2S Short To Power DTCs P1130, P1150 and/or P1132, P1152 indicate HO2S is always rich. DTCs P1130 and P1132 are for right front HO2S. DTCs P1150 and P1152 are for left front HO2S. Possible causes are: Moisture inside HO2S wiring harness connector. HO2S circuit shorted to power. NOTE: HO2S may be displayed on scan tool as O2S. Turn ignition on. Using scan tool, select appropriate HO2S PID for DTC generated. If PID voltage is 1-4 volt, go to next step. If PID voltage is not 1-4 volts, go to step 74). PID for DTC P1130 and P1132 is HO2S-11. PID for DTC P1150 and P1152 is HO2S-21.
41. 72) Check For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Disconnect suspect HO2S connector. Disconnect scan tool from DLC. For DTCs P1130 and P1132, measure resistance between test pin No. 60 and test pins No. 71 and 90 at breakout box. For DTCs P1150 and P1152, measure resistance between test pin No. 87 and test pins No. 71 and 90 at breakout box. If all resistance readings are more than 10,000 ohms, remove breakout box. Reconnect PCM to PCM wiring harness connector and go to next step. If any resistance reading is 10,000 ohms or less, repair short to power.
42. 73) Check HO2S Signal Ensure suspect HO2S is disconnected. Turn ignition on. Using scan tool, select HO2S PID for DTC generated. If PID voltage is less than .2 volt. If PID voltage is .2 volt or more, replace PCM.
43. 74) Attempt To Generate DTC P1131 & P1151 Connect a jumper wire between HO2S SIGNAL terminal at HO2S wiring harness connector and negative battery terminal. Perform KOER ON-DEMAND SELF-TEST. 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 terminals and repair as necessary. If PCM connector is okay, replace PCM.
44. 75) HO2S Check Connect DVOM between HO2S SIGNAL terminal and SIG RTN terminal at HO2S wiring harness connector. Disconnect any vacuum hose from vacuum tree. Start engine and operate at 2000 RPM. If DVOM voltage is less than .4 volt within 30 seconds, reconnect vacuum hose and reconnect all connector. Go to next step. If DVOM voltage is not less than .4 volt, replace HO2S.
45. 76) Monitor HO2S PID Start engine and allow to idle. Using scan tool, select HO2S PID for suspect HO2S. Observe PID voltage while wiggling and bending wiring harness between HO2S and PCM. If PID voltage stays high (more than .45 volt) or stays low (less than .45 volt), isolate cause of lack of HO2S switches. Repair as necessary. If PID voltage switches, go to next step.
46. 77) Monitor HO2S PID During Test Drive Leave scan tool connected to DLC. Using an assistant, test drive vehicle under various conditions while observing HO2S PID voltage. If PID voltage switches from about .4 to .6 volt, system is okay and testing is complete. If voltage does not switch from about .4 to .6 volt, replace HO2S. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 77) to step 80). No test procedures have been omitted.
47. 80) KOER DTCs P1137, P1138, P1157 & P1158 These DTCs indicate lack of HO2S switching. Possible causes are: Damaged wiring harness or connector. Exhaust system leaks. Contaminated or defective HO2S. Faulty PCM. Inspect for faults. Repair as necessary. If no faults are found, go to next step.
48. 81) Check Exhaust System Leaks in exhaust system between engine and end of catalytic converter can cause DTCs P1137, P1138, P1157 and P1158 to set. Possible causes are: Incorrect HO2S torque. Exhaust system leaks. Inspect entire exhaust system including catalyst and HO2S. Repair as necessary. If no faults are present, go to next step.
49. 82) Check HO2S Circuit Turn ignition off. Connect scan tool to DLC. Ensure suspect HO2S and PCM are connected. Turn ignition on. Using scan tool, select appropriate HO2S PID for DTC generated. If PID voltage is more than 1.6 volts, replace HO2S. If PID voltage is 1.6 volts or less, go to next step. PID for DTC P1137 and P1138 is HO2S-12. PID for DTC P1157 and P1158 is HO2S-22.
50. 83) Check HO2S Circuit For Short Circuit Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) and appropriate HO2S SIG test pin and at breakout box as follows: HO2S 12 (right rear HO2S), test pin No. 35. HO2S 22 (left rear HO2S), test pin No. 61. Also, measure resistance between appropriate HO2S SIG test pin and test pins No. 71 (VPWR), 90 (VREF) and 103 (PWR GND) at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
51. 84) Check Ground Circuit Continuity Disconnect suspect HO2S connector. Measure resistance between appropriate HO2S SIG test pin at breakout box and HO2S SIGNAL terminal at suspect HO2S wiring harness connector. Also, measure resistance between test pin No. 91 at breakout box and SIG RTN terminal at suspect HO2S wiring harness connector. If any resistance reading is 5 ohms or more, repair open circuit. If both resistance readings are less than 5 ohms, replace PCM. HO2S 12 (right rear HO2S), test pin No. 35. HO2S 22 (left rear HO2S), test pin No. 61. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 84) to step 90). No test procedures have been omitted
52. 90) KOER DTC P0127 DTC P0127 indicates that HO2S heater was not on during KOER self-test and testing of HO2S did not occur. Possible cause is cool exhaust system. Connect scan tool to DLC. Using scan tool, select HTR-11, HTR-12, HTR21 and HTR-22 HO2S heater PIDs from PID/DATA monitor menu. If all PIDs indicate ON, repeat KOER ON-DEMAND SELF-TEST. If any PIDs indicate OFF, operate engine until all PIDs are on. Repeat KOER ON-DEMAND SELF-TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 90) to step 100). No test procedures have been omitted.
53. 100) KOER P1128 & P1129 These DTCs indicate that during KOER self-test, one or both HO2S signals were crossed from bank to bank. DTC P1128 refers to HO2S in front of converter. DTC P1129 refers to HO2S behind converter. Possible causes for these faults are: Crossed HO2S connectors. Crossed HO2S wiring at HO2S connector. Crossed HO2S wiring at PCM connector. Turn ignition off. Disconnect suspect HO2S. Inspect connector for indication of crossed wires or incorrect installation. Repair as necessary. If no faults are found, go to next step.
54. 101) Verify Proper HO2S SIG Pin Location Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Disconnect both suspect HO2S connectors. DTC P1128 is for left front HO2S and right front HO2S. DTC P1129 is for left rear HO2S and right rear HO2S. Measure resistance between HO2S SIGNAL terminal at suspect HO2S wiring harness connector and appropriate HO2S SIG test pin at breakout box as follows: Left Front HO2S; test pin No. 87. Right Front HO2S; test pin No. 60. Left Rear HO2S; test pin No. 61. Right Rear HO2S; test pin No. 35. If all resistance readings are less than 5 ohms, fault is intermittent and cannot be duplicated at this time. If any resistance reading is 5 ohms or more, HO2S wiring is crossed. Recheck all HO2S wiring pin locations at PCM and HO2S connectors. Repair as necessary.

CIRCUIT TEST HB - NATURAL GAS FUEL DELIVERY SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

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 pressure regulator.
4. Fuel supply.
5. Fuel injector or fuel rail.
6. Solenoid shut-off valve.

Fuel Rail Solenoid Shutoff Valve Connector Terminals. Scheme 41

Identifying NG Fuel System Components. Scheme 42

Note. Fuel rail solenoid shutoff valve is also referred to as low pressure solenoid shutoff valve. Fuel tank solenoid shutoff valve is also referred to as fuel tank solenoid valve.

1. 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 the following conditions are present: Battery is fully charged and fuses are okay. Fuel filter element is okay. If vehicle does not start, ensure vehicle has fuel in tank and Inertia Fuel Shutoff (IFS) switch is set correctly. Repair as necessary and verify symptom no longer exists. If fuel smell is present, go to step 16). If no faults are found, go to next step.
2. 2) Check Fuel Tank Pressure Turn ignition off. Install fuel tank venting tool (supplied in Kit 134-00114) to vehicle fueling connector. Open by-pass on fill valve. Turn ignition on. Record fuel tank pressure reading. If pressure reading is more than 500 psi (3447 kPa), turn ignition off. Close by-pass on fill valve. Remove fuel tank venting tool and go to step 5). If fuel pressure is 500 psi (3447 kPa) or less, turn ignition off. Close by-pass on fill valve. Remove fuel tank venting tool and go to next step.
3. 3) Check Voltage At Fuel Tank Solenoid Shutoff Valve Turn ignition on. Using scan tool, enter OUTPUT TEST MODE and select ALL ON. Measure voltage between GROUND terminal and PWR terminal at fuel tank solenoid shutoff valve wiring harness connector. Fuel tank solenoid shutoff valve is located on fuel tank (one per tank). If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, check for faulty fuel tank solenoid shutoff valve. Replace as necessary.
4. 4) Check VPWR Circuit Between Solenoid & Battery With scan tool still in OUTPUT TEST MODE and ALL ON selected, measure voltage between negative battery terminal and PWR terminal at fuel tank solenoid shutoff valve wiring harness connector. If voltage is 10.5 volts or less, repair open in PWR circuit. If voltage is more than 10.5 volts, repair open in ground circuit to tank solenoid shutoff valve. Verify symptom is no longer present. WARNING: Fuel system remains under high pressure even when engine is not running. To avoid injury, release fuel pressure before disconnecting any fuel system hose or component. See REMOVE/INSTALL/OVERHAUL - CNG article.
5. 5) Check Fuel Pressure Connect fuel pressure gauge to Schrader valve. Release fuel pressure in fuel injection rail back to fuel tanks. See REMOVE/INSTALL/OVERHAUL - CNG article. Turn ignition on or start engine. Turn ignition off. Wait 2 minutes and check fuel pressure. If fuel pressure is 80-120 psi (552-827 kPa), go to next step. If fuel pressure is not 80-120 psi (552-827 kPa), replace fuel pressure regulator.
6. 6) Verify Fuel Rail Pressure (FRP) Sensor Accuracy Turn ignition off. Connect fuel pressure gauge with vent hose to Schrader valve on fuel rail. Turn ignition on. Using scan tool, select FRP PID from PID/DATA monitor menu. Note FRP PID pressure reading. Observe fuel gauge and note fuel pressure. Turn ignition off. Slowly open shutoff valve on fuel pressure gauge and bleed fuel pressure down to 50-70 psi (345-483 kPa). Remove fuel pump relay. Turn ignition on. Note FRP PID pressure reading on scan tool. Note fuel pressure as shown on gauge. Compare pressure readings. If FRP PID reading is consistent and within 10 psi of fuel pressure at Schrader valve, go to step 10). If pressure readings are not as specified, go to next step.
7. 7) Verify Fuel Rail Solenoid Shutoff Valve Opens Fuel rail solenoid shutoff valve is located on fuel rail. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Select ALL ON and ALL OFF several times by toggling Start and Stop button on scan tool. If fuel rail solenoid shutoff valve cannot be heard or felt operating, go to next step. If fuel rail solenoid shutoff valve can be heard or felt operating, replace FRP sensor and verify symptom no longer exists.
8. 8) Check Voltage At Fuel Rail Solenoid Shutoff Valve Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Select ALL ON and START. Measure voltage between PWR terminal and GROUND terminal at fuel rail solenoid shutoff solenoid wiring harness connector. NOTE: When energized by scan tool, PWR circuit to fuel rail solenoid shutoff valve will remain on for only 8 seconds. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, replace fuel rail solenoid shutoff valve and verify symptom no longer exists.
9. 9) Check For Open Circuit Leave scan tool connected and ignition on. Using scan tool, access OUTPUT TEST MODE. Select ALL ON and START. Measure voltage between PWR terminal at fuel rail solenoid shutoff valve wiring harness connector and battery negative terminal. If voltage is 10.5 volts or less, repair open in PWR circuit. If voltage is more than 10.5 volts, repair open in ground circuit. Verify symptom is no longer present.
10. 10) Verify Fuel Rail Solenoid Shutoff Valve Seals Ensure fuel pressure gauge is connected with vent hose. Release fuel pressure in fuel injector rail back to fuel tanks. See REMOVE/INSTALL/OVERHAUL - CNG article. Turn ignition on or start engine. Turn ignition off. Disconnect fuel rail solenoid shutoff valve connector. Crank engine for 3 seconds. Turn ignition off and wait 2 minutes. Using scan tool, select FRP PID. Turn ignition on. If PID reading is less than 10 psi (70 kPa), go to next step. If PID reading is 10 psi (70 kPa) or more, replace fuel rail solenoid shutoff valve.
11. 11) Verify Fuel Rail Solenoid Shutoff Valve Partially Opens Release fuel pressure in fuel injector rail back to fuel tanks. See REMOVE/INSTALL/OVERHAUL - CNG article. Ensure fuel rail solenoid shutoff valve is disconnected. Turn ignition on, with engine off. Turn ignition off. Reconnect fuel rail solenoid shutoff valve connector. Turn ignition on, with engine off. Using scan tool, select FRP PID and note PID pressure reading. Note fuel pressure as shown on fuel pressure gauge. Compare pressure readings. If FRP PID reading is within 10 psi of fuel pressure at Schrader valve, go to next step. If pressure readings are not within 10 psi, replace fuel rail solenoid shutoff valve. Verify symptom is no longer present.
12. 12) Verify Fuel Rail Solenoid Shutoff Valve Fully Opens Release fuel pressure in fuel injector rail back to fuel tanks. See REMOVE/INSTALL/OVERHAUL - CNG article. Disconnect fuel rail solenoid shutoff valve connector. Turn ignition on, with engine off. Turn ignition off. Reconnect fuel rail solenoid shutoff valve connector. Turn ignition on and immediately start engine. Increase engine speed to 2500 RPM while monitoring FRP PID pressure reading. Note fuel pressure as shown on fuel pressure gauge. Compare pressure readings. If FRP PID reading is within 10 psi of fuel pressure at Schrader valve, go to next step. If pressure readings are not within 10 psi, replace fuel rail solenoid shutoff valve. Verify symptom is no longer present.
13. 13) Check Fuel Pressure Start engine and allow it to idle. Using scan tool, select FRP PID. Note PID pressure reading. Increase engine speed to 2500 RPM. Again, note PID pressure reading. If PID pressure reading at idle is 80-120 (552-827 kPa) and more than 80 psi (552 kPa) with engine speed at 2500 RPM, turn ignition off and go to next step. If PID pressure reading is not as specified, check for plugged fuel lines. Repair as necessary and retest. If fuel lines are okay, replace fuel pressure regulator. Verify symptom no longer exists.
14. 14) Check Fuel Pressure Regulator Thermostat Start engine. Allow engine to reach normal operating temperature. Using a thermometer or temperature probe, measure temperature at fuel pressure regulator coolant bowl or coolant outlet. If temperature is 59-140°F (15-60°C), turn ignition off and go to next step. If temperature is less than 59°F (15°C), check coolant lines. Repair as necessary and retest. If coolant lines are okay, replace fuel pressure regulator. If temperature is more than 140°F (60°C), replace fuel pressure regulator. Verify symptom no longer exists.
15. 15) Check Fuel Injector Flow Turn ignition on. Using scan tool, select FRP PID. Note PID pressure reading. Connect Fuel Injector Tester (164-R3795) to suspect fuel injector. Set pulse width to 200 milliseconds and activate fuel injector tester. Again, note PID pressure reading. Compare pressure readings. Repeat procedure for remaining fuel injectors. If initial PID pressure reading is 35-50 psi (241-345 kPa) and each injector PID pressure reading is within 3 psi (20 kPa) of each other, no problem is indicated at this time. If symptom still exists, go to TESTS W/O CODES - 5.4L CNG article.
16. 16) Check For Fuel Leak Turn ignition off. Inspect fuel system for obvious signs of fuel leaking. If fuel system looks okay, release fuel system pressure. Install fuel pressure gauge. Turn ignition on. Fuel pressure should be more than 85 psi (586 kPa). Cover fuel system using soapy water solution. If no bubbles develop, fuel leaks cannot be found and testing is complete. If bubbles develop, isolate fault and repair as necessary. NOTE: If vehicle has sat for several hours with engine off, a slight natural gas smell may be detected around the intake manifold area. This is a normal condition.

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. WARNING: Fuel system remains under high pressure even when engine is not running. To avoid injury, release fuel pressure before disconnecting any fuel system hose or component. CIRCUIT TEST ACRONYMS Acronym Definition DLC Data Link Connector PID Parameter Identification

1. 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. Ensure fuel filter has been serviced in the previous 1000 miles. 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. 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 8 seconds. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is more than specified, go to step 8). If fuel pressure is less than specified, go to step 11).
3. 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. 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 10).
5. 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 11).
6. 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. 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, repair restriction in vacuum system. If fuel pressure does not change as vacuum changes, replace fuel pressure regulator.
8. 8) 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-123323) article. If fuel pressure is as specified with fuel returning to container, go to next step. If fuel pressure is not as specified with fuel returning to container, replace fuel pressure regulator. If fuel pressure is zero, go to step 12).
9. 9) Check Fuel Pressure & Return Release fuel system pressure. Turn ignition off. Connect scan tester to DLC. Remove fuel return line at the fuel rail. Connect a hose from fuel rail to a container with a capacity of 1 quart or more. Turn ignition on. Using scan tester, access Output Test Mode. Note fuel pressure and flow into container. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123323) article. If fuel pressure is as specified and flowing steadily into container, go to next step. If fuel pressure is more than specified, replace fuel pressure regulator. If fuel pressure is less than specified, go to step 11).
10. 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. 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-24082-S37578241852001010400000) .
12. 12) Check Fuel Pump Voltage Turn ignition off. Ensure scan tester is connected to DLC. Ensure IFS switch is set correctly. Disconnect fuel pump wiring harness connector. Check connector terminals for damage and repair as necessary. Turn ignition on. Using scan tester, enter Output Test Mode (OTM) and activate fuel pump circuit. Check voltage at fuel pump connector terminals. 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.
13. 13) Check Fuel Supply System Turn ignition off. Release fuel system pressure. Check fuel return system for kinked or restricted hoses. Disconnect fuel supply hose at fuel rail and at the fuel pump. Apply 3-5 psi to fuel hose from fuel rail. If air flows freely, replace fuel module. If air does not flow freely, repair or replace hose as necessary.

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

Scheme 43

1. Ignition system.
2. Fuel pressure.
3. Fuel injectors.
4. Engine vacuum system.
5. Evaporative system.
6. Canister purge solenoid.
7. Internal engine wear. (Scheme 43): Identifying CKP Sensor & Crankshaft Wheel MISFIRE TROUBLE CODES Service DTC Application P0301 Cylinder No. 1 (Test Pin No. 75) P0302 Cylinder No. 2 (Test Pin No. 101) P0303 Cylinder No. 3 (Test Pin No. 74) P0304 Cylinder No. 4 (Test Pin No. 100) P0305 Cylinder No. 5 (Test Pin No. 73) P0306 Cylinder No. 6 (Test Pin No. 99) P0307 Cylinder No. 7 (Test Pin No. 72) P0308 Cylinder No. 8 (Test Pin No. 98) P0300 Multiple Cylinder Misfire Or Defective CKP Sensor

1. 1) Check Possible Cause Of Misfire If vehicle runs out of fuel, a trouble code may be stored in PCM memory. Ensure vehicle has not recently run out of fuel. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) if necessary. If vehicle is equipped with crankshaft pulley-mounted pulse ring, go to next step. If vehicle is not equipped with crankshaft pulley-mounted pulse ring, go to step 3).
2. 2) Check Crankshaft Pulley Turn ignition off. Remove front cover if necessary. Check crank pulley and pulse ring for damage or looseness. Repair or replace as necessary. If no faults are found, go to next step.
3. 3) 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.
4. 4) Check For KOEO DTCs If any KOEO DTCs are present, service as necessary. Disregard misfire codes at this time. If any other DTCs are present, proceed to appropriate CIRCUIT TEST. 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.
5. 5) 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.
6. 6) 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»(ref-24082-S37818249282001010400000) , step 100). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 8). No test procedures have been omitted.
7. 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 56) under «CIRCUIT TEST H»(ref-24082-S20533704122001010400000) .
8. 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. Go to next step. If test light does not glow dimly (no light/bright light), replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
9. 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-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000) .
10. 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»(ref-24082-S13544258072001010400000) .
11. 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-24082-S37578241852001010400000) . 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.
12. 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.
13. 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.
14. 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.
15. 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).
16. 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.
17. 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»(ref-24082-S16577748702001010400000) .
18. 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-24082-S37578241852001010400000) .
19. 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-24082-S37578241852001010400000) . If vacuum is not as specified, go to step 25). 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.
20. 30) Check For Additional Misfire DTCs If any DTCs except P0300 are present, go to step 1). If no other DTCs are present, go to next step.
21. 31) Check For Continuous DTCs If continuous codes are present, service as necessary. If no other misfire codes are present, go to next step.
22. 32) 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»(ref-24082-S37818249282001010400000) , step 100). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 32) to step 40). No test procedures have been omitted.
23. 40) DTC P1309 This fault indicates misfire detection monitor malfunction. Turn ignition and all accessories off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Connect DVOM between test pins No. 85 and No. 51 or 103. Using starter, bump engine in short bursts for at least 10 revolutions. DO NOT allow engine to start. If voltage switches from less than 0.2 volts to over 8.0 volts, check CMP sensor for correct installation. If sensor is correctly installed, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage does not switch from less than 0.2 volts to over 8.0 volts, replace CMP sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 44

Scheme 45

Scheme 46

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). (Scheme 44): Identifying DPFE Sensor Wiring Harness Connector Terminals (Scheme 45): Identifying EVR Solenoid Wiring Harness Connector Terminals (Scheme 46): Identifying DPFE System Components

Scheme 47

1. 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. 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-24082-S37578241852001010400000).
3. 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 VREF voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-24082-S14410186652001010400000).
4. 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-24082-S37578241852001010400000). If any measurement is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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»(ref-24082-S16577748702001010400000). 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. 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 DPFEGR PID voltage is more than 4.0 volts, go to next step. If DPFEGR PID voltage is 4.0 volts or less, go to step 19).
7. 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. 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-24082-S37578241852001010400000). If voltage is less than 10.5 volts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
9. 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. 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»(ref-24082-S14410186652001010400000).
11. 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-24082-S37578241852001010400000). If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
12. 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-24082-S37578241852001010400000).
13. 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-24082-S37578241852001010400000). If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
14. 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-24082-S37578241852001010400000). If resistance is 10,000 ohms or less, repair short between DPFE SIG and VREF circuit. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
15. 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»(ref-24082-S16577748702001010400000).
16. 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»(ref-24082-S07955820122001010400000). 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. 21) Turn ignition off. Reconnect EGR vacuum hose. Perform «KOER SELF-TEST»(ref-24082-S07955820122001010400000). 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. 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-24082-S37578241852001010400000).
19. 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 0.35-1.25 volts. 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-24082-S37578241852001010400000) eat QUICK TEST. If PID voltage is as specified, go to next step.
20. 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. 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-24082-S37578241852001010400000). If solenoid is not plugged or restricted, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
22. 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-24082-S37578241852001010400000).
23. 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. 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-24082-S37578241852001010400000). 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. 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 0.35-1.25 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-24082-S37578241852001010400000).
26. 31) Check DPFE SIG Voltage Leave ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.35-1.25 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-24082-S37578241852001010400000).
27. 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-24082-S37578241852001010400000).
28. 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»(ref-24082-S16577748702001010400000). 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. 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 47) If hoses are not routed correctly, repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If hoses are routed correctly, problem cannot be identified at this time. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). (Scheme 47): 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. 50) DTC P1405: Check For Upstream Pressure Hose Connection Check upstream hose for clean, tight connection. (Scheme 47) Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If hose is okay, go to next step.
31. 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-24082-S37578241852001010400000). If hose is okay, go to next step.
32. 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-24082-S37578241852001010400000). If no faults are found, clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If hose is okay, go to next step.
33. 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 0.35-1.25 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 are not as specified, replace DPFE sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage readings are as specified, fault is intermittent and cannot be duplicated at this time. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 60) DTC P1406: Check For Downstream Pressure Hose Connection Check downstream hose for clean, tight connection. (Scheme 47) Repair as necessary. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If hose is okay, go to next step.
35. 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-24082-S37578241852001010400000). If hose is okay, go to next step.
36. 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-24082-S37578241852001010400000). If no faults are found, go to next step.
37. 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 0.35-1.25 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 are not as specified, replace DPFE sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage readings are as specified, fault is intermittent and cannot be duplicated at this time. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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-24082-S07955820122001010400000). If DTC P1408 is present, go to next step. If DTC P1408 is not present, go to step 90).
39. 71) DTC P1408 This code indicates KOER SELF-TEST 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. 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-24082-S07955820122001010400000) 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 less than 3.0 in. Hg, go to step 80).
41. 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-24082-S37578241852001010400000).
42. 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»(ref-24082-S14410186652001010400000).
43. 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 0.35-1.25 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-24082-S37578241852001010400000). If voltages are as specified, go to next step.
44. 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 obtain 800 RPM. As vacuum increases, PID voltage should rise (up to 2.5 volts). When vacuum is held steady, PID voltage should hold steady. If vacuum is as specified, reconnect all components and go to step 85). If vacuum is not as specified, service or replace EGR valve. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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-24082-S37578241852001010400000).
46. 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 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-24082-S37578241852001010400000).
47. 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-24082-S37578241852001010400000).
48. 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-24082-S37578241852001010400000).
49. 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-24082-S37578241852001010400000).
50. 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-24082-S37578241852001010400000). If vacuum gauge is less than 4 in. Hg, replace EVR solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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. 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-24082-S37578241852001010400000). 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. 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-24082-S37578241852001010400000). If no faults are indicated, symptom cannot be identified at this time. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000). 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.
54. 100) Check EGR Valve & Vacuum Supply Perform «QUICK TEST»(ref-24082-S37578241852001010400000) and service any other DTCs if present. If no other DTCs are present, disconnect and plug EGR vacuum supply hose. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.35-1.25 volt. Start engine and allow to idle. DPFEGR PID voltage should increase about 1.5 volts. If voltage is as specified, service or replace EGR valve. If voltage is not as specified, inspect EGR vacuum regulator solenoid vent and vent filter. If no faults are found, replace EGR vacuum regulator solenoid. 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. 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-24082-S37578241852001010400000).
56. 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-24082-S37578241852001010400000).
57. 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-24082-S37578241852001010400000).
58. 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-24082-S37578241852001010400000). If any resistance is less than 10,000 ohms, repair EVR circuit short to PWR or PWR GND and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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.
59. 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»(ref-24082-S16577748702001010400000).

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

1. 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. 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. 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. 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. 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. 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-123323) article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000) .
7. 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. 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. 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. 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. 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-24082-S37578241852001010400000) .
12. 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 48

1. 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. 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. 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, proceed as follows: On models equipped with Fuel Tank Pressure (FTP) sensor, go to step 47) of «CIRCUIT TEST HX»(ref-24082-S15395066392001010400000) . On models not equipped with Fuel Tank Pressure (FTP) sensor, go to step 10) of «CIRCUIT TEST HW»(ref-24082-S18067495952001010400000) .

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

Scheme 49

Scheme 50

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). (Scheme 49): Identifying TP-B Operational Range (Scheme 50): Identifying TA System Connectors & Test Circuits

Scheme 51

1. 1) DTC P0222: Verify TP-B Voltage This DTC indicates TP-B voltage was less than 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. 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-24082-S37578241852001010400000). If voltage is not 4-6 volts, go to next step.
3. 3) Leave TP-B disconnected. Turn ignition on. Measure voltage between terminals SIG RTN and VREF at TP-B connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-24082-S14410186652001010400000).
4. 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 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-24082-S37578241852001010400000). If resistance is less than 5 ohms, go to next step.
5. 5) Check TP-B Circuit For Short To Ground Or SIG RTN Turn ignition off. Disconnect scan tool from DLC (if applicable). Measure resistance between test pin No. 63 (TP-B) and test pins No. 51, 91 and 103 (PWR GND) at the breakout box. If each resistance measurement is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If any resistance measurement is less than 10,00 ohms, repair TP-B circuit short to ground or SIG RTN and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
6. 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»(ref-24082-S16577748702001010400000). 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. 10) DTC P0223: 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. 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 TP-B terminal at 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).
9. 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-24082-S37578241852001010400000). If voltage is less than 10.5 volts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
10. 13) 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. 14) Leave TP-B disconnected and ignition on. Measure voltage between SIG RTN and VREF terminals at connector. If voltage is 4-6 volts, replace TP-B sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-24082-S14410186652001010400000).
12. 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-24082-S37578241852001010400000). If resistance is less than 10,000 ohms, repair TP-B circuit short to VREF and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
13. 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»(ref-24082-S16577748702001010400000). 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. 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. 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-24082-S37578241852001010400000). If throttle does not bind, replace series throttle and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
16. 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. 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 is 1-5 ohms, go to next step. If any measurement is not 1-5 ohms, replace ST stepper motor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). (Scheme 51): Identifying Stepper Motor Terminals
18. 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-24082-S37578241852001010400000). 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. 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-24082-S37578241852001010400000). If all resistance measurements are less than 5 ohms, go to next step.
20. 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, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
21. 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-24082-S37578241852001010400000).
22. 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-24082-S37578241852001010400000).
23. 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. 45 (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-24082-S37578241852001010400000).
24. 30) Leave STC disconnected. Turn ignition on. Measure voltage between test pin No. 45 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-24082-S37578241852001010400000).
25. 31) Turn ignition off. Leave STC disconnected. Measure resistance between test pin No. 45 (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-24082-S37578241852001010400000). If resistance is 10,000 ohms or more and DTC P1220 is present, go to next step. If resistance is 10,000 ohms or more and DTC P1220 is not present, fault is intermittent and cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000).
26. 32) Leave ignition off and STC disconnected. Connect DVOM between test pin No. 45 (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-24082-S37578241852001010400000). If DVOM does not indicate a brief change of voltage, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
27. 33) Turn ignition off. Disconnect TP-B sensor wiring harness connector. Measure voltage between connector terminals SIG RTN and VREF. If voltage is 4-6 volts, replace TP-B and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-24082-S14410186652001010400000). 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. 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. Disconnect air tube from ST assembly. Check throttle linkage for binding or sticking. Repair if necessary. If throttle linkage is okay, go to next step.
29. 41) Turn ignition off. 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-24082-S37578241852001010400000).
30. 42) Measure VREF At TP-B Sensor 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-24082-S37578241852001010400000). If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-24082-S14410186652001010400000).

Diagnostic Aid

On every power-up, the series throttle is commanded to self-test from the PCM. To verify this signal, go to next step.

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

Scheme 52

Scheme 53

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). (Scheme 52): Air Intake Circuit & Components Schematic (Scheme 53): Identifying IMRC Connector Terminals

1. 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. 2) Check Accelerator Linkage If linkage sticks, binds or grabs, go to next step. If linkage operation is okay, go to step 7).
3. 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. 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 on 2.0L engines, replace throttle body. If throttle screw is not as specified on all engines except 2.0L, 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. 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 0.53-1.27 volts (11-25%). 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. 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, replace throttle body assembly.
7. 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. 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 as indicated: Exhaust system; «CIRCUIT TEST HF»(ref-24082-S14636018362001010400000) . Fuel pressure; «CIRCUIT TEST HC»(ref-24082-S13544258072001010400000) . PCV system; «CIRCUIT TEST HG»(ref-24082-S33239231642001010400000) . Engine cooling system; repair as necessary.
9. 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. 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 as specified, go to next step. If IAC PID values are not as specified, go to step 12).
11. 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. 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. 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. 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-24082-S37578241852001010400000) . If resistance is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
15. 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 article in this section. 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. 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 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 P1537 and/or P1538, go to step 52).
17. 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 P1537 and/or P1538, go to step 52).
18. 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 P1537 and/or P1538, go to step 52).
19. 19) Verify IMRC Circuit Fault 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. 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-24082-S37578241852001010400000) .
21. 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-24082-S37578241852001010400000) .
22. 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. 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 test pin No. 42 and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is less than one volt, go to next step. If either voltage is more than one volt, repair short circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
24. 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-24082-S37578241852001010400000) .
25. 25) Verify PCM IMRC Driver Reconnect IMRC module. Turn ignition on. Connect jumper wire between test pin No. 42 and test pin No. 51 or 103 at breakout box. If IMRC plates open, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If IMRC plates do not open, replace IMRC module and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
26. 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. 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. 28) Turn ignition off. Leave IMRC module disconnected. Measure resistance between IMRC terminal at wiring harness connector and negative battery terminal. Measure resistance between IMRC terminal and SIG RTN terminal at wiring harness connector. 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-24082-S37578241852001010400000) .
29. 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). Turn ignition off. Disconnect IMRC wiring harness connector. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Connect jumper wire between IMRC wiring harness connector terminal IMRCM and terminal PWR GND or SIG RTN. Using scan tester, access IMRCM PID (if scan tester communication exists, remove jumper wire and go to step 38). 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. 30) Turn ignition off. Leave IMRC module disconnected. Disconnect scan tester from DLC. Measure resistance between SIG RTN terminal at IMRC wiring harness connector and negative battery terminal. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in SIG RTN circuit and go to step 33).
31. 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. 32) 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. 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-24082-S37578241852001010400000) and retrieve all DTCs. If any DTCs are present, go to appropriate CIRCUIT TEST. If any other DTCs are present, service as necessary. If no DTCs are present, testing is complete.
34. 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. 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 less 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»(ref-24082-S16577748702001010400000) .
36. 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 pin No. 42 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. 37) Turn ignition on. While observing IMRC plates, wiggle wiring harness between IMRC module and PCM connector. If IMRC plates move while wiggling harness, fault is indicated. Isolate and repair if necessary. If no faults are indicated, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) .
38. 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-24082-S37578241852001010400000) . If resistance is less than 10,000 ohms, repair short between IMRCM and VREF circuit.
39. 39) 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. 42 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-24082-S37578241852001010400000) . If resistance is less than 10,000 ohms, repair short to PWR GND in IMRC control circuit.
40. 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. 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 (if applicable). Manually rotate IMRC levers. If PID voltage is 1.0 volts or more as levers are rotated, go to step 47). If PID voltage is not as specified, go to next step.
42. 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. 43) Check IMRC Monitor Resistance 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»(ref-24082-S16577748702001010400000) .
44. 44) Check IMRC Monitor Power Ground 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. 45) Check IMRC Monitor Signal Short To Power 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 103 (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. 46) Check IMRC Monitor Signal Return 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. 47) Check IMRC Output Test Mode 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»(ref-24082-S16577748702001010400000) . If PID values do not change, go to next step.
48. 48) Check Bank One IMRC Vacuum Signal 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. 49) Check Bank 2 IMRC Vacuum Signal 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. 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 No. 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. 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 No. 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. 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 and 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. 52) 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 and 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. 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 and IMRC2M PID. Turn ignition ON. 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»(ref-24082-S16577748702001010400000) .
55. 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 10 in. Hg or more, go to next step. If vacuum reading is less than 10 in. Hg, repair vacuum circuit and go to step 33).
56. 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. Raise engine speed to 3500 RPM. 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. 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. 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 IMRC circuit and go to step 33).
59. 59) Check IMRC Circuit To PCM Turn ignition on. Measure voltage between test pin No. 42 and test pins No. 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. 60) Check VPWR Circuit Turn ignition off. Disconnect both IMRC sensor wiring harness connectors. Turn ignition on. Measure voltage between VPWR terminal of each 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. 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. 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 1000-10,200 ohms, reconnect all components and go to step 33). If resistance is not 1000-10,200 ohms, replace IMRC sensor and go to step 33).
63. 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 No. 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. 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 29) for electronic controlled systems or step 41) for vacuum controlled systems. If PID voltage is 3.0 volts or more, go to step 26) for electronic controlled systems or step 55) for vacuum controlled systems.
65. 65) Check IMT Valve & Vacuum Actuator Connection Turn ignition off. Disconnect IMT valve and vacuum actuator wiring harness connector. Inspect for damaged or loose pins and repair if necessary. If no faults are found, go to next step.
66. 66) Check IMT Valve & Vacuum Actuator VPWR Circuit For Open Turn ignition off. Measure resistance between chassis ground and VPWR terminal at IMT valve 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 VREF circuit.
67. 67) Check IMT Valve & Vacuum Actuator Circuit For Open Turn ignition off. Leave IMT valve wiring harness connector 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. 46 at breakout box and IMT VALVE terminal at harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in IMT VALVE circuit.
68. 68) Check IMT Valve & Vacuum Actuator Circuit For Short To PWR GND Leave ignition off. Disconnect scan tester from DLC (if applicable). Leave PCM and IMT valve wiring harness connector disconnected. Measure resistance between test pin No. 46 and test pins No. 77 and 103 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair IMT VALVE circuit short to PWR GND circuit.
69. 69) Check IMT VALVE Circuit Short To VREF Or VPWR Leave PCM and IMT valve wiring harness connector disconnected. Turn ignition on. Measure voltage between test pin No. 46 and test pins No. 77 and 103 at breakout box. If voltage is 10.5 volts or more, repair IMT VALVE circuit short to VREF or VPWR. If voltage is less than 10.5 volts, go to next step.
70. 70) Check IMT Valve Actuator Internal Resistance Turn ignition off. Reconnect IMT valve wiring harness connector. Leave breakout box installed and PCM disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pins No. 46 and 97 (VPWR) at breakout box. If resistance is 65-85 ohms (SOHC engine) or 5-300 ohms (all except SOHC engine), replace PCM. If resistance is not as specified, replace IMT VALVE.
71. 71) Perform IMRC Wiggle Test Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using scan tester, access IMRCM PID. Observe PID values while wiggling wiring harness between IMRC monitor connector and PCM. If PID value fluctuates, isolate fault and repair as necessary. If PID value does not fluctuate, replace PCM and go to step 38).

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

Scheme 54

Scheme 55

Scheme 56

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 (PF) Sensor.
5. Faulty Vapor Management Valve (VMV).
6. Faulty carbon canister.
7. Faulty PCM. (Scheme 54): Identifying EVAP Components Using Purge Flow System (Scheme 55): Identifying EVAP Components Using Vapor Management System (Scheme 56): Identifying VMV Test Circuit & Connector Terminals

Scheme 57

1. 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-24082-S37578241852001010400000).
2. 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-24082-S37578241852001010400000).
3. 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 and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
4. 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 is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
5. 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, go to step 17). 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»(ref-24082-S37578241852001010400000).
6. 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 is indicated, isolate and repair as necessary. If no fault is go to step 8).
7. 7) Check Purge Flow (PF) Sensor Connect scan tester to Data Link Connector (DLC). Start engine and allow to idle. Disconnect PF sensor wiring harness connector. Inspect connector for damage and repair if necessary. Using scan tester, access PF PID. If voltage fluctuates, go to step 9). If voltage does not fluctuate as specified, go to next step.
8. 8) Continuous Memory DTC P1443; Visually Inspect 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 21).
9. 9) 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-24082-S37578241852001010400000).
10. 10) 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-24082-S37578241852001010400000). If solenoid operates as specified, check fuel vapor hoses between carbon canister and CANP solenoid for damage or restriction. Repair as necessary.
11. 11) Check For Vacuum At Purge Flow (PF) Sensor Turn ignition off. Ensure PF sensor is connected. Reconnect CANP solenoid. Remove hose from manifold vacuum at PF sensor and attach vacuum gauge to hose. Start engine and allow to idle. If vacuum is 10 in Hg. or more, check for small vacuum leak between PF sensor and intake manifold. Repair as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If vacuum is less than 10 in Hg., repair large vacuum leak or blockage in hose between PF sensor and intake manifold. Repair as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If DTC P1443 is still present, go to next step.
12. 12) Check CANP Solenoid Resistance Turn ignition off. Leave CANP wiring harness connector disconnected. Measure resistance between CANP solenoid terminals. If resistance is 30-90 ohms, go to next step. If resistance is not as specified, replace CANP solenoid. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
13. 13) Check Circuit For Short To VPWR 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 (CANP solenoid) or 56 (VMV) and test pins No. 71 and 97 at breakout box. If each resistance is more than 10,000 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If resistance is 10,000 ohms or less, repair EVAP CANP/VMV circuit short to VPWR circuit. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 21). No test procedures have been omitted.
14. 21) Check VMV Housing Turn ignition off. Reconnect VMV wiring harness connector. Disconnect VMV fuel vapor hose from intake manifold port at VMV. Disconnect VMV fuel vapor hose from vapor canister 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 is not held, replace VMV and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If vacuum is held, go to next step. (Scheme 57): Identifying VMV Hose Ports
15. 22) 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 not held, remove vacuum pump and go to next step. If vacuum is held or bleeds off slowly, service VMV filter. If filter cannot be serviced, replace VMV.
16. 23) 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 is less than 10.5 volts, repair open in VPWR circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
17. 24) 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-24082-S37578241852001010400000). If vacuum is as specified, remove vacuum gauge and jumper wire. Go to next step.
18. 25) Turn ignition off. Reconnect VMV wiring harness connector. 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, leave hoses disconnected 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.
19. 26) 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, fault is intermittent and cannot be duplicated at this time. Testing is complete. If vacuum is not bled off immediately, check hoses for damage or restriction. Repair or replace as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
20. 27) Continuous Memory DTC P1444 Turn ignition off. Disconnect PF sensor wiring harness connector. Inspect pins for damage and repair as necessary. Reconnect PF sensor wiring harness connector. Connect scan tester to Diagnostic Link Connector (DLC). Turn ignition on. Using scan tester, access PF PID. If PF PID voltage is 0.4 volt or less, go to next step. If PF PID voltage is 0.2 volt or less, go to step 30). If voltage is more than 0.4 volt or more, fault is intermittent. Go to step 32).
21. 28) Turn ignition off. Disconnect PF sensor wiring harness connector. Ensure PF sensor temperature is 55-80°F (13-27°C). Measure resistance between PF sensor terminal No. 1 and No. 2. Resistance should be less than 160 ohms. Measure resistance between PF sensor terminal No. 1 and No. 3. Resistance should be less than 190 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace PF sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
22. 29) Check For Open In VPWR Circuit Leave ignition off and PF 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 pin No. 1 at PF sensor and test pins No. 71 and 91 at breakout box. If resistance is less than 5 ohms, go to next step for DTC P1444 or step 34) for DTC P1445. If resistance is 5 ohms or more, repair open in VPWR and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
23. 30) Leave ignition off and PF sensor disconnected. Ensure PF sensor temperature is 55-80°F (13-27°C). Measure resistance between PF sensor terminal No. 2 and No. 3. If resistance is more than 25.5 ohms, go to next step. If resistance is not as specified, replace PF sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
24. 31) Check PF Circuit For Short To VPWR Leave ignition off and PF 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. Disconnect scan tester from DLC (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-24082-S37578241852001010400000). If any resistance is 10,000 ohms or less, repair PF circuit short to PWR GND. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
25. 32) Wiggle Test Solenoid & Harness Turn ignition off. Using scan tester, access PF PID. Observe PF PID for indication of fault while shaking and bending PF sensor wiring harness and connector. A fault will be indicated by sudden change of voltage. Tap lightly on PF sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000).
26. 33) Continuous DTC P1445 Turn ignition off. Disconnect PF sensor wiring harness connector. Inspect pins for damage and repair as necessary. Reconnect PF sensor wiring harness connector. 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 step 28). If voltage is 4.8 volts or less, go to step 39).
27. 34) Check Purge Flow (PF) Sensor Turn ignition off. Disconnect PF sensor wiring harness connector. Allow sensor to cool to room temperature. Measure resistance between terminal No. 1 and No. 2. If resistance is 40-230 ohms, go to next step. If resistance is not 40-230 ohms, replace PF sensor and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
28. 35) Check PF Circuit Short To VPWR Leave PF 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 37).
29. 36) Turn ignition off. Leave PF 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 PF circuit short to VPWR and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If voltage is 10.5 volts or less, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
30. 37) Check PF Circuit For Open in Harness Turn ignition off. Leave PF 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-24082-S37578241852001010400000).
31. 38) Check PWR GND Circuit For Open in Harness Leave ignition off and PF 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-24082-S37578241852001010400000). If resistance is 5 ohms or more, repair open in PWR GND circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
32. 39) 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 PF sensor wiring harness and connector. A fault will be indicated by sudden change of voltage. Tap lightly on PF sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000).
33. 40) Continuous Memory DTC P0443: Check VMV Circuit For Intermittent Failure Repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If Continuous Memory DTC P0443 is still present, go to next step. If Continuous Memory DTC P0443 is not present, go to step 1).
34. 41) 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»(ref-24082-S16577748702001010400000).

CIRCUIT TEST HX - EVAPORATIVE EMISSION (EVAP) MONITOR & SYSTEM

Note. Enter this Pinpoint Test only when directed here. The use of a soap solution, such as SNOOP, around the fuel filler cap or the use of a hydrocarbon emission analyzer to determine an evaporative emission system leak is not recommended. A Rotunda Evaporative Emission System Leak Tester for OBD II (including the ultra-sonic tester) is the only device recommended for use at this time for evaporative emission system leak detection.

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. EVAP system tubes
5. Faulty fuel vapor valve.
6. Faulty fuel vapor control valve (if equipped).
7. Faulty carbon canister.
8. Vacuum source line (input port vacuum to intake manifold).
9. Wiring harness circuits (CV, EVAP Canister Purge Valve, FLI, FTP, PCM, PWR GND, SIG RTN, VMV, VPWR and VREF).
10. Faulty PCM.

This Pinpoint Test is used as an assistance in diagnosing the following EVAP components

1. EVAP canister and bracket assembly.
2. EVAP canister sleeve assembly.
3. Canister Vent (CV) solenoid - hose assembly.
4. EVAP canister.
5. Canister Vent (CV) solenoid (mechanical concern only).
6. Fuel filler pipe check valve assembly.
7. Fuel tank filler pipe.
8. Fuel tank assembly (with fuel vapor vent valve).
9. Fuel tank assembly (without fuel vapor vent valve).
10. Fuel vapor control valve.
11. Fuel vapor vent valve.

Identifying EVAP Components. Scheme 58

Identifying CV Solenoid Connector & Test Circuit. Scheme 59

Identifying FTP Connector & Test Circuit. Scheme 60

Identifying VMV Connector & Test Circuit. Scheme 61

1. 1) DTC P0442: Visual Inspection For Small Evaporative Emission System Leaks Continuous Memory DTC P0442 indicates that a fuel vapor leak has been detected, as small as 0.04" (0.10 cm) in the EVAP system. Check for the presence of fuel filler cap. Perform step 2 before tightening a loose cap or checking for a cross threaded cap. Verify that the Canister Vent (CV) solenoid is properly seated on the EVAP canister (if possible). Visually inspect for cut or loose connections to fuel vapor hoses and tubes at the EVAP canister to EVAP canister purge valve, EVAP canister to fuel vapor vent valve assembly and the fuel vapor control valve tube assembly to fuel tank (if applicable). Check for fuel filler pipe damage. If a fault is indicated, connect or replace fuel vapor hoses or tubes as required. Replace damaged EVAP system components as necessary. After repairs, go to next step. If a fault is not indicated, go to next step.
2. 2) Check For Small Evaporative Emission System Leaks From The Evaporative Test Port Disconnect and plug EVAP canister purge valve to intake manifold return tube at intake manifold vacuum source. Connect scan tool. Key on, engine off. Access VPWR PID. If voltage is not 12 volts or greater, go to step 61) . Locate evaporative test port that is marked EVAPORATIVE SERVICE PORT DO NOT USE UNREGULATED PRESSURE ABOVE 6.89 kPa (1 PSI) near EVAP canister purge valve or EVAP canister. If vehicle not equipped with evaporative test port, go to next step. Install Rotunda EVAP System Leak Tester (310-F007 or 134-00056) or equivalent at evaporative test port. Close CV solenoid by accessing Output Test Mode on scan tool. Select ALL OFF mode and push START button. Regulate nitrogen or argon gas pressure on tester to 14 in. H2O (3.48 kPa). Pressurize EVAP system. Perform EVAP system leak test. If EVAP system pressure stays above 8 in. H2O (1.99 kPa) and system passes leak test, check for visible damage to fuel filler cap. Remove EVAP system Leak Tester from EVAP test port. Go to next step. If EVAP system pressure does not stay above 8 in. H2O (1.99 kPa) and system does not pass leak test, remove EVAP system Leak Tester from evaporative test port and go to next step.
3. 3) Check For Small Leaks At Fuel Filler Cap & Evaporative Test Port Install EVAP System Leak Tester at fuel filler pipe. Using tester, perform TESTING AT FILLER NECK. Access ultra-sonic detector from test kit. Key on, engine off. Close CV solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Perform EVAP system leak test. Slowly pass detector probe around fuel filler cap and evaporative test port. If an audible change around fuel filler cap or evaporative test port causes EVAP system leak test to fail, replace fuel filler cap or evaporative test port. When test port is part of EVAP canister purge valve, replace valve. Repeat pinpoint test step 3). If EVAP system passes leak test, remove EVAP System Leak Tester from fuel filler pipe. Reconnect and tighten fuel filler cap only one eighth turn so that cap initially clicks by sound or touch. Perform «VEHICLE PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S03410067582002032300000) and repeat «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . For EVAP system not passing the leak test, remove EVAP System Leak Tester from fuel filler pipe. Reconnect and tighten fuel filler cap only 1/8 turn so that cap initially clicks by sound or touch. Go to next step. If an audible change around fuel filler cap or evaporative test port does not cause EVAP system leak test to fail, remove EVAP System Leak Tester from fuel filler pipe. Reconnect and tighten fuel filler cap only 1/8 turn so cap initially clicks by sound or touch. Perform «VEHICLE PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S03410067582002032300000) and repeat «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) .
4. 4) Small Leak Check For EVAP System With Leak Tester Set At Fill Position Install EVAP System Leak Tester at evaporative test port. Close CV solenoid by accessing Output Test Mode on scan tool. Select ALL OFF mode and push START button. Regulate nitrogen or argon gas pressure on tester to 14 in. H2O (3.48 kPa). Turn selector on Leak Tester to FILL POSITION. Pressurize EVAP system to 14 in. H2O (3.48 kPa). If pressure on EVAP system holds between 13.80-14.20 in. H2O (3.43-3.53 kPa), go to next step. If pressure on EVAP system does not hold between 13.80-14.20 in. H2O (3.43-3.53 kPa), discontinue pressurizing EVAP system and go to step 6) .
5. 5) Check For Small Leak In Entire EVAP System With Ultra-Sonic Detector Key on, engine off. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Access ultra-sonic detector from EVAP System Leak Tester kit. Slowly pass detector probe over EVAP system at the following locations: EVAP return tube to EVAP canister purge valve. EVAP canister purge valve to EVAP canister CV solenoid assembly. EVAP canister CV solenoid assembly to fuel tank. Fuel filler cap and fuel filler pipe. If a sudden audible change is indicated, reconnect loose or replace damaged fuel vapor hoses/tubes (EVAP return tube, EVAP canister purge outlet tube and EVAP canister tube). When repairs are completed, go to next step. If a sudden audible change is not indicated, discontinue pressurizing EVAP system and go to next step.
6. 6) Check For Small Evaporative Leak From EVAP Return Tube To EVAP Canister With Ultra-Sonic Detector Disconnect EVAP canister tube (from the fuel tank) at fuel vapor tee between EVAP canister purge valve and EVAP canister (or at the F-fitting on the EVAP canister). Plug (cap) fuel vapor tee (or the F-fitting on the canister). Close CV solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa) at evaporative test port. Access ultra-sonic detector from EVAP System Leak Tester kit. Slowly pass detector probe from EVAP return tube (intake manifold to EVAP canister purge valve), EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister CV solenoid assembly) and canister vent hose assembly. If a sudden audible change is indicated, reconnect loose or replace damaged EVAP return tube, EVAP canister purge outlet tube or canister vent hose assembly. Repeat pinpoint test step 6) to verify fuel vapor leak no longer exists and go to next step. If a sudden audible change is not indicated, remove plug from fuel vapor tee (or F-fitting) on EVAP canister and go to next step.
7. 7) Check For Small Evaporative Leak Between EVAP Canister Tube & Fuel Tank At Fuel Filler Pipe Remove EVAP System Leak Tester equipment from evaporative test port. Remove fuel filler cap. Install EVAP System Leak Tester at fuel filler pipe. Plug open end of EVAP canister tube (from the fuel tank) at fuel vapor tee (or at the F-fitting on the EVAP canister). Key on, engine off. Pressurize EVAP system at 26-28 in. H2O (6.47-6.97 kPa) with selector on the Leak Tester at FILL POSITION. Access ultra-sonic detector from EVAP System Tester kit. Slowly pass detector probe from EVAP canister tube to fuel tank, checking FTP sensor, fuel vapor vent valve(s), fuel vapor control valve and fuel filler pipe. If a sudden audible change is indicated, reconnect loose or replace damaged fuel vapor hoses/tubes (EVAP canister tube). Replace damaged EVAP system component as necessary. Repeat pinpoint test step 7) to verify leak no longer exists and go to next step. If a sudden audible change is not indicated, go to next step.
8. 8) Verification Leak Check On EVAP System At Fuel Filler Pipe Reconnect EVAP canister tube to fuel vapor tee (or F-fitting on EVAP canister). Key on, engine off. Close CV solenoid by accessing Output Test Mode on scan tool. Regulate nitrogen or argon gas pressure on tester to 14 in. H2O (3.48 kPa). Pressurize EVAP system to 14 in. H2O (3.48 kPa) at fuel filler pipe. Perform EVAP system leak test. If EVAP system passes leak test, remove EVAP System Leak Tester from fuel filler pipe. Reinstall fuel filler cap and tighten only 1/8 turn so that cap initially clicks by sound or touch. Reconnect EVAP return tube to intake manifold vacuum. Perform Vehicle Preparation For OBD-II Or Monitor Repair Verification Drive Cycle. See «VEHICLE PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S03410067582002032300000) . Repeat EVAP Running Loss Monitor System Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If EVAP system does not pass leak test, begin at pinpoint test step 4) and locate a small leak that still exists. Proceed to pinpoint test step 8) afterwards to verify repair. Remove EVAP System Leak Tester. Reinstall fuel filler cap and tighten only 1/8 turn so that cap initially clicks by sound or touch. Reconnect EVAP return tube to intake manifold. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle. See «VEHICLE PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S03410067582002032300000) . Repeat EVAP Running Loss Monitor System Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 10). No test procedures have been omitted.
9. 10) DTC P0443: Inspect EVAP Canister Purge Valve Circuit For Intermittent Failure Continuous Memory Diagnostic Trouble Code (DTC) P0443 may indicate an intermittent EVAP canister purge valve circuit failure. Possible causes: Intermittent EVAP canister purge valve or VPWR circuit open. Damaged EVAP canister purge valve. Rerun KOEO, KOER Self-Tests and retrieve Continuous Memory DTCs. If DTC P0443 is present in Continuous Memory Self-Test only, the fault that produced Continuous Memory DTC P0443 can be intermittent. Go to step 16) . If DTC P0443 is not present in Continuous Memory Self-Test only, go to next step.
10. 11) DTC P0443: Check VPWR Voltage To EVAP Canister Purge Valve DTC P0443 indicates a failure in the EVAP canister purge valve circuit. Possible causes: VPWR circuit open. EVAP canister purge valve circuit open. EVAP canister purge valve circuit shorted to PWR GND. EVAP canister purge valve circuit shorted to VPWR. Damaged EVAP canister purge valve. Damaged PCM. Key off. Disconnect EVAP canister purge valve. Key on, engine off. Measure voltage between VPWR circuit at EVAP canister purge valve harness connector and battery negative post. Key off. If voltage is greater than 10.5 volts, go to next step. If voltage is not greater than 10.5 volts, repair open circuit. Restore vehicle. Complete PCM reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
11. 12) Check EVAP Canister Purge Valve Resistance Disconnect EVAP canister purge valve. Measure EVAP canister purge valve (EVAP canister purge valve) resistance. If resistance is between 30-38 ohms, go to next step. If resistance is not between 30-38 ohms, replace damaged EVAP canister purge valve. Complete PCM Reset to clear DTCs. Rerun EVAP System Leak Test at evaporative test port to verify repair. Repeat EVAP Running Loss Monitor System Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) .
12. 13) Check EVAP Canister Purge Valve Circuit For Open In Harness Install breakout box, leave PCM disconnected. Measure resistance of EVAP canister purge valve circuit between PCM test pin No. 56 and EVAP canister purge valve harness connector. If resistance is less than 5.0 ohms, go to next step. If resistance is not less than 5.0 ohms, repair open circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test.
13. 14) Check EVAP Canister Purge Valve Circuit For Short To PWR GND In Harness Disconnect scan tool from DLC. Measure resistance between PCM test pin No. 56 and PCM test pins No. 24 and 103. If both resistances are greater than 10,000 ohms, go to next step. If both resistances are not greater than 10,000 ohms, repair short circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
14. 15) Check EVAP Canister Purge Valve Circuit For Short To VPWR In Harness Key on, engine off. Measure voltage between PCM test pin No. 56 and PCM test pins No. 51 and 103. Key off. If voltage is greater than 10.5 volts, repair short circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is not greater than 10.5 volts, replace damaged PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
15. 16) Check EVAP Canister Purge Valve Circuit For Intermittent Open Key off. Install breakout box, leave PCM disconnected. Measure the resistance between PCM test pins No. 56 and 71 while performing the following: Lightly tap on EVAP canister purge valve and observe a resistance change. Wiggle EVAP canister purge valve connector and harness between valve and PCM, observe a resistance change. If resistance reading changes to less than 30 ohms or more than 38 ohms, isolate fault and repair as necessary. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun EVAP System Leak Test at evaporative test port to verify repair. Rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If the resistance reading does not change to less than 30 ohms or more than 38 ohms, unable to duplicate or identify fault at this time, go to CIRCUIT TEST Z - INTERMITTENT with the resistance readings from this test and a list of possible causes. See «CIRCUIT TEST Z - INTERMITTENT»(ref-24082-S16577748702001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 18). No test procedures have been omitted.
16. 18) DTC P0446 OR P1450: Check For Visual Causes Of Excessive Fuel Tank Vacuum Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 indicates that Self-Test has detected the EVAP Control System has excessive fuel tank vacuum. Also, a DTC P0446 indicates a vent control malfunction. Possible causes: EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks. EVAP canister tube (fuel tank to EVAP canister) blockages or kinks. Fuel vapor elbow on EVAP canister contaminated. Restricted EVAP canister. Canister vent (CV) solenoid stuck closed (partially or fully). Plugged or contaminated CV solenoid filter. EVAP canister purge valve stuck open. Fuel filler cap stuck closed (no vacuum relief). VREF circuit open in fuel tank pressure (FTP) sensor. Damaged FTP sensor. Check for kinks or bends in fuel vapor hoses/tubes (EVAP canister purge outlet tube and EVAP canister tube). Visually inspect EVAP canister inlet port, CV solenoid filter and canister vent hose assembly for contamination or debris. Check CV solenoid filter for blockage or contamination. If a fault is indicated, remove any contamination or debris around fuel vapor hoses/tubes and EVAP canister CV solenoid assembly. Remove kinks or bends in EVAP canister purge outlet tube, EVAP canister tube and canister vent hose assembly. After repairs, go to next step. If a fault is indicated, go to next step.
17. 19) Check For Blockage Between EVAP Test Port & EVAP Canister CV Solenoid Assembly Disconnect and plug EVAP return tube (EVAP canister purge valve to intake manifold) at intake manifold vacuum source. Plug (tape) CV solenoid (or filter) or plug canister vent hose assembly. Locate evaporative test port marked EVAPORATIVE SERVICE PORT DO NOT USE UNREGULATED PRESSURE ABOVE 6.89 kPa (1 PSI) near EVAP canister purge valve or EVAP canister. Install Rotunda Evaporative Emission System Leak Tester 310-F007 (134-00056) or equivalent at the test port. Regulate nitrogen or argon gas pressure on tester to 14 in. H2O (3.48 kPa). Pressurize EVAP system to 14 in. H2O (3.48 kPa). Remove plug (tape) from CV solenoid or plug from canister vent hose assembly. If EVAP system pressure drops rapidly (quickly), remove EVAP System Leak Tester from evaporative test port. Reinstall evaporative test port cap and go to next step. If EVAP system pressure does not drop rapidly (quickly), go to «TEST A: HISS WHEN OPENING FUEL CAP/FUEL TANK PRESSURE ABNORMAL»(ref-24082-S33013053712002100400000) under SYSTEM TESTS (EVAPORATIVE EMISSIONS). Repeat step 19) to verify blockage no longer exists and go to step 22) .
18. 20) Pressure Check Fuel Filler Cap Install EVAP System Leak Tester at fuel filler pipe. Follow instructions that come with EVAP System Leak Tester kit to perform TESTING AT FILLER NECK. Key on, engine off. Close CV solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa) at evaporative test port. Rotunda Engine EAR Amplifier (107-R2100) is an optional tool that can be used if noise level hinders effectiveness of ultra-sonic detector. Access ultra-sonic detector from EVAP System Leak Tester kit. Slowly pass detector probe around fuel filler cap and evaporative test port. If audible change around fuel filler cap is indicated, replace fuel filler cap. Repeat step 20) to verify repair and go to next step. If audible change around fuel filler cap is not indicated, go to next step.
19. 21) Check For Blockage Between EVAP Test Port & Fuel Tank Key on, engine off. Close CV solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa) at evaporative test port. Remove fuel filler cap. If pressure drops rapidly (quickly), remove EVAP System Leak Tester from fuel filler pipe and go to next step. If pressure does not drop rapidly (quickly), go to «TEST A: HISS WHEN OPENING FUEL CAP/FUEL TANK PRESSURE ABNORMAL»(ref-24082-S33013053712002100400000) under SYSTEM TESTS (EVAPORATIVE EMISSIONS). Repeat step 21) to verify a blockage no longer exists and go to next step.
20. 22) Check Fuel Tank Pressure Sensor PIDS With Fuel Filler Cap Removed Remove fuel filler cap. Key on, engine off. Access FTP (FTP V) PIDs on scan tool. Record reading. If FTP PID reading is between -1.50-1.50 in. H2O (-0.37-0.37 kPa) or 2.40-2.80 volts with fuel filler cap off, install fuel filler cap only 1/8 turn so that cap initially clicks by sound or touch and go to next step. If FTP PID reading is not between -1.50-1.50 in. H2O (-0.37-0.37 kPa) or 2.40-2.80 volts with fuel filler cap off, go to step 24) .
21. 23) Check For Stuck Open EVAP Canister Purge Valve Condition At Idle Open CV solenoid to atmosphere by removing plug from canister vent hose assembly or tape from CV solenoid filter cap. Remove plug and reconnect EVAP return tube (EVAP canister purge valve to intake manifold) at intake manifold vacuum source. Verify fuel filler cap is installed. Key on, engine off. Access FTP, FTP V and EVAPPDC PIDs on scan tool. Start engine. When EVAPPDC PID is zero, if FTP (FTP V) PID reading is less than -1.50 in. H2O (-0.37 kPa) or 2.40 volts, EVAP canister purge valve is stuck open. Replace EVAP canister purge valve. Install EVAP System Leak Tester or equivalent to evaporative test port. Perform EVAP system leak test to VERIFY leak did not occur on EVAP canister purge valve installation. Then, REPEAT step 23) to VERIFY repair. PERFORM Vehicle Preparation for Monitor Repair Verification Drive Cycle and RERUN Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . When EVAPPDC PID is zero, if FTP (FTP V) PID reading is NOT less than -1.50 in. H2O (-0.37 kPa) or 2.40 volts and FTP (FTP V) PID readings are within the range specified in step 22), perform EVAP system leak test to verify no leak exists. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and RERUN Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . Otherwise, go to 19) to find additional blockages.
22. 24) Check Voltage Between VREF & SIG RTN Circuits At FTP Sensor Disconnect FTP sensor. Key on, engine off. Measure voltage between VREF and SIG RTN circuits at FTP sensor harness connector. Key off. If voltage is between 4.0-6.0 volts, replace damaged FTP sensor. After replacing FTP sensor, perform EVAP system leak test at EVAP test port to verify repair caused no leak and go to step 22) to verify repair. If voltage is not between 4.0-6.0 volts, go to next step.
23. 25) Check For Open VREF Circuit Between PCM & FTP Sensor Install breakout box, leave PCM disconnected. Measure resistance of VREF circuit between PCM test pin 90 and FTP sensor harness connector. If resistance less than 5.0 ohms, replace PCM. Restore vehicle and go to step 22) to verify repair. If resistance not less than 5.0 ohms, repair open circuit. Restore vehicle and go to step 22) to verify repair.
24. 26) DTC P0452: Check For FTP Sensor Connector Contamination Diagnostic Trouble Code (DTC) P0452 indicates that Self-Test has detected an FTP circuit input less than minimum. Possible causes: Fuel tank pressure (FTP) sensor completely submerged in liquid fuel. Inside contamination of electrical connector on FTP sensor. FTP short to SIG RTN or PWR GND. Damaged FTP sensor. Damaged PCM. Key off. Visually check for contamination of FTP sensor electrical connector. Check for completely submerged FTP sensor in liquid fuel (can affect correct FTP voltage reading). If FTP sensor and its electrical connector show signs of contamination, repair FTP sensor electrical connector as necessary. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If FTP sensor and its electrical connector do not show signs of contamination, go to next step.
25. 27) Check For Low FTP Sensor Voltage Key off. Connect scan tool. Key on, engine off. Access FTP V PID on scan tool. If FTP V PID voltage is less than 0.22 volt, go to next step. If FTP V PID voltage is not less than 0.22 volt, the fault that produced DTC P0452 is intermittent. Go to step 31) .
26. 28) Check Opposite Induced High FTP Signal Key off. Disconnect FTP sensor. Connect jumper wire between VREF circuit and FTP circuits at FTP sensor harness connector. Key on, engine off. If scan tool communication concern exists, remove jumper immediately and go directly to next step. Access FTP V PID. If FTP V PID value is between 4.0-6.0 volts, replace damaged FTP sensor. Restore vehicle. Rerun EVAP System Leak Test at EVAP test port to verify repair. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If FTP V PID value is not between 4.0-6.0 volts, remove jumper and go to next step.
27. 29) Check Voltage Between VREF & SIG RTN Circuits AT FTP Sensor Key on, engine off. Measure voltage between VREF and SIG RTN circuits at FTP sensor harness connector. Key off. If VREF voltage is between 4.0-6.0 volts, go to next step. If VREF voltage is not between 4.0-6.0 volts, VREF voltage is out of range. Check VREF. See «CIRCUIT TEST C - REFERENCE VOLTAGE»(ref-24082-S14410186652001010400000) .
28. 30) Check FTP Circuit For Short To SIG RTN Or PWR GND In Harness Install breakout box, leave PCM disconnected. Disconnect scan tool from DLC. Measure resistance between PCM test pins No. 62 and 91. Measure resistance between PCM test pin No. 62 and PCM test pins No. 51 and 103. If both resistances are greater than 10,000 ohms, replace PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If both resistances are not greater than 10,000 ohms, repair short circuit. Restore vehicle. Complete PCM reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
29. 31) Check FTP Sensor Circuit For Intermittent Short To Ground Key on, engine off. Access FTP V PID. Observe FTP V PID while performing the following: Lightly tap on sides of FTP sensor. Do not tap on top of sensor cover because that can result in an incorrect reading or damage to sensor. This action requires two technicians to lower fuel tank to access sensor location. Wiggle FTP sensor connector and harness between sensor and PCM. A fault is indicated by a sudden change in the FTP V PID voltage. Key off. If a fault is indicated, isolate fault and repair as necessary. If FTP sensor is removed from fuel tank or replaced, rerun EVAP System Leak Test at evaporative test port to verify repair. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If a fault is not indicated, unable to duplicate or identify fault at this time, go to CIRCUIT TEST Z - INTERMITTENT with FTP V PID from this test and a list of possible causes. See «CIRCUIT TEST Z - INTERMITTENT»(ref-24082-S16577748702001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 33). No test procedures have been omitted.
30. 33) DTC P0453: Check For High FTP Sensor Voltage Diagnostic Trouble Code (DTC) P0453 indicates that Self-Test has detected a FTP circuit input above the maximum. Possible causes: FTP open. FTP short to VREF or VPWR. VREF shorted to VPWR. SIG RTN open. Damaged FTP sensor. Damaged PCM. Key off. Connect scan tool. Key on, engine off. FTP sensor input with no pressure/vacuum on fuel tank (fuel filler cap open or not open to atmosphere) is 2.37-2.97 volts. Access FTP V PID. If FTP V PID voltage greater than 4.50 volts, go to next step. If FTP V PID voltage not greater than 4.50 volts, the fault that produced DTC P0453 is intermittent. Go to step 42) .
31. 34) Check FTP Circuit For Short To Power Key off. Disconnect FTP sensor. Key on, engine off. Measure voltage between FTP circuit at FTP sensor harness connector and battery negative post. Key off. If voltage is greater than 10.5 volts, FTP is indicating a short to VPWR. Go to next step. If voltage is not greater than 10.5 volts, go to step 36) .
32. 35) Check FTP Circuit For Short To VPWR In Harness Install breakout box, leave PCM disconnected. Key on, engine off. Measure voltage between PCM test pin No. 62 and PCM test pins No. 51 and 103. If voltage is greater than 10.5 volts, repair short circuit. Restore vehicle. Complete PCM reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is not greater than 10.5 volts, replace damaged PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
33. 36) Check Opposite Induced Low FTP Signal Connect jumper wire between SIG RTN and FTP circuits at FTP sensor harness connector. Key on, engine off. If scan tool communication concern exists, turn key off, remove jumper immediately and go directly to step 41) . Access FTP V PID. Key off. If FTP V PID voltage is less than 0.10 volt, remove jumper. Go to next step. If FTP V PID voltage is not less than 0.10 volt, unable to induce opposite signal. Go to step 39) .
34. 37) Check For In Range Voltage Between VREF & SIG RTN Circuits At FTP Sensor Key on, engine off. Measure voltage between VREF circuit and SIG RTN circuit at FTP sensor vehicle harness connector. Key off. If VREF voltage is between 4.0-6.0 volts, go to next step. If VREF voltage is not between 4.0-6.0 volts, VREF voltage is out of range. Check VREF. See «CIRCUIT TEST C - REFERENCE VOLTAGE»(ref-24082-S14410186652001010400000) .
35. 38) Check FTP Circuit For Short To VREF In Sensor Or Harness Install breakout box, leave PCM disconnected. Measure resistance between PCM test pins No. 62 and 90. If resistance greater than 10,000 ohms, replace damaged FTP sensor. Restore vehicle. Rerun EVAP System Leak Test at EVAP test port to verify repair. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If resistance not greater than 10,000 ohms, repair short circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
36. 39) Check FTP Circuit For Open In Harness Install breakout box, leave PCM disconnected. Measure resistance of FTP circuit between PCM test pin No. 62 and FTP sensor harness connector. If resistance less than 5.0 ohms, go to next step. If resistance not less than 5.0 ohms, repair open circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
37. 40) Check For Open SIG RTN Circuit Between PCM & FTP Sensor Measure resistance of SIG RTN circuit between PCM test pin No. 91 and FTP sensor harness connector. If resistance less than 5.0 ohms, go to next step. If resistance not less than 5.0 ohms, repair open circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
38. 41) Check FTP Circuit For Short To VREF In PCM Install breakout box, leave PCM disconnected. Measure resistance between PCM test pins No. 62 and 90. If resistance greater than 10,000 ohms, replace PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance not greater than 10,000 ohms, repair short circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
39. 42) Check FTP Sensor Circuit For Intermittent Open Or Short To Power Key on, engine off. Access FTP V PID. Observe FTP V PID while performing the following: Lightly tap on sides of FTP sensor. DO NOT tap on top of sensor cover to prevent incorrect reading or damage to sensor. This action requires two technicians to lower fuel tank to access sensor location. Wiggle FTP sensor connector and harness between sensor and PCM. Fault is indicated by sudden change in FTP V PID voltage. Key off. If a fault is indicated, isolate fault and repair as necessary. If FTP sensor is removed from fuel tank or replaced, rerun EVAP System Leak Test at evaporative test port to verify repair. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If no fault indicated or unable to duplicate or identify fault at this time, go to «CIRCUIT TEST Z - INTERMITTENT»(ref-24082-S16577748702001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 42) to step 44). No test procedures have been omitted.
40. 44) DTC P0455: Visual Inspection For Substantial Evaporative Emission System Leaks Continuous Memory Diagnostic Trouble Code (DTC) P0455 indicates that EVAP control system detected large leak or no purge flow. Possible causes: After market parts and accessories nonconforming to EVAP system specifications. Damaged, missing or improperly installed fuel filler cap. Blockage in fuel vapor hoses/tubes (EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube) in EVAP system. Disconnected or cracked fuel vapor hoses/tubes in EVAP system. EVAP canister purge valve stuck closed. Canister vent (CV) solenoid stuck open. Fuel tank pressure (FTP) sensor malfunction. EVAP canister leaking. Fuel vapor control valve tube assembly blocked. Fuel vapor vent valve assembly blocked. Check for missing fuel filler cap. If cap is loose DO NOT disturb EVAP system. Verify that both input port vacuum hose and EVAP return tube are attached to EVAP canister purge valve. Verify that CV solenoid is properly seated on EVAP canister (if possible). Visually inspect for disconnected or cracked fuel vapor hoses/tubes between intake manifold, EVAP canister purge valve, EVAP canister, fuel vapor vent valve assembly and if applicable, fuel vapor control valve tube assembly. Check for damage to fuel filler pipe and fuel tank. If fault indicated, connect or replace fuel vapor hoses/tubes as required. Replace damaged EVAP system components as necessary. Go to next step.
41. 45) Check For Evaporative Emission System Leaks Disconnect and plug EVAP return tube (EVAP canister purge valve to intake manifold) at intake manifold vacuum source. Connect scan tool. Key on, engine off. Access VPWR PID. If voltage is not 12 volts or greater, go to step 61) . If voltage is 12 volts or greater, locate evaporative test port marked EVAPORATIVE SERVICE PORT DO NOT USE UNREGULATED PRESSURE ABOVE 6.89 kPa (1 PSI) near EVAP canister purge valve or EVAP canister. If vehicle not equipped with evaporative test port, go to step 50) . Install Rotunda Evaporative Emission System Leak Tester 310-F007 (134-00056) or equivalent at evaporative test port. Close CV solenoid by accessing Output Test Mode on scan tool. Select ALL OFF mode and push START button. Regulate nitrogen or argon gas pressure on tester to 14 in. H2O (3.48 kPa). Follow instructions that come with EVAP System Leak Tester and pressurize EVAP system. Perform EVAP system leak test. If pressure on EVAP system stays above 8 in. H2O (1.99 kPa) and passes leak test, go to next step. If pressure on EVAP system does not stay above 8 in. H2O (1.99 kPa) and does not pass leak test, remove EVAP System Leak Tester from evaporative test port and reinstall test port cap. Go to 50) .
42. 46) Blockage Check For EVAP Canister CV Solenoid Assembly Key on, engine off. Close CV solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa). De-energize CV solenoid with scan tool. If pressure on EVAP system drops rapidly (quickly) to zero, go to step 48) . If pressure on EVAP system does not drop rapidly (quickly) to zero, go to next step.
43. 47) Check For Blockage Between EVAP Canister Purge Valve & EVAP Canister Disconnect and plug EVAP canister purge outlet tube (between EVAP canister purge valve and EVAP canister) at EVAP canister. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Remove plug from EVAP canister purge outlet tube. If EVAP system pressure drops rapidly (quickly), go to «TEST A: HISS WHEN OPENING FUEL CAP/FUEL TANK PRESSURE ABNORMAL»(ref-24082-S33013053712002100400000) under SYSTEM TESTS (EVAPORATIVE EMISSIONS). Repeat test step 46) to verify blockage no longer exists. Afterwards, go to next step. If pressure on EVAP system does not drop rapidly (quickly) to zero, remove blockage or contamination from EVAP canister purge outlet tube. If necessary, replace tube. Repeat test step 46) to verify blockage no longer exists.
44. 48) Check For Blockage Between The EVAP Test Port & The Fuel Tank Key on, engine off. Close Canister Vent (CV) solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa) at evaporative test port. Remove fuel filler cap. If pressure on EVAP system drops to zero, leave fuel filler cap off. Go to step 56) . If pressure on EVAP system does not drop to zero, remove EVAP System Leak Tester equipment from evaporative test port. Reinstall test port cap and go to next step.
45. 49) Check For Blockage Between Fuel Tank & EVAP Canister Tube Key on, engine off. Install EVAP System Leak Tester at fuel filler pipe. Remove and plug EVAP canister tube (from fuel tank) at fuel vapor line tee fitting between EVAP canister purge valve and EVAP canister (or at F-fitting on EVAP canister). Pressurize EVAP system to 14 in. H2O (3.48 kPa) at fuel filler pipe. Remove plug from EVAP canister tube. If pressure on EVAP system drops, remove EVAP System Leak Tester from fuel filler pipe. Reconnect EVAP canister tube and go to step 56) . If pressure on EVAP system does not drop, go to «TEST A: HISS WHEN OPENING FUEL CAP/FUEL TANK PRESSURE ABNORMAL»(ref-24082-S33013053712002100400000) under SYSTEM TESTS (EVAPORATIVE EMISSIONS). Repeat test step 48) to verify blockage no longer exists. Leave fuel filler cap off and go to step 56) .
46. 50) Check For Large Leaks At Fuel Filler Cap & Evaporative Test Port Install EVAP System Leak Tester at fuel filler pipe. Follow instructions that come with EVAP System Leak Tester kit to perform TESTING AT FILLER NECK. Access ultra-sonic detector from test kit. Key on, engine off. Close Canister Vent (CV) solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Perform EVAP system leak test. Slowly pass detector probe around fuel filler cap and evaporative test port. If an audible change around fuel filler cap or evaporative test port is causing EVAP system leak test to fail, replace fuel filler cap or evaporative test port. When test port is part of EVAP canister purge valve, replace valve. Repeat this step to verify repair. If EVAP system passes leak test, remove EVAP System Leak Tester from fuel filler pipe. Reconnect and tighten fuel filler cap only 1/8 turn so that cap initially clicks by sound or touch. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If EVAP system fails leak test, remove EVAP System Leak Tester from fuel filler pipe. Reconnect and tighten fuel filler cap only 1/8 turn so that cap initially clicks by sound or touch and go to next step. If an audible change around fuel filler cap or evaporative test port is not causing EVAP system leak test to fail, remove EVAP System Leak Tester from fuel filler pipe. Reconnect and tighten fuel filler cap only 1/8 turn so that cap initially clicks by sound or touch and go to next step.
47. 51) Check For Fuel Vapor Leak In EVAP Canister CV Solenoid Assembly Plug canister vent hose assembly or close (tape CV filter shut) CV solenoid to atmosphere. Pressurize EVAP system to 14 in. H2O (3.48 kPa) at evaporative service port. Slowly pass detector probe around EVAP canister CV solenoid assembly. If an audible change around EVAP canister CV solenoid assembly is indicated, leak test EVAP canister CV solenoid assembly. Replace damaged component. Perform leak test on EVAP canister CV solenoid assembly prior to installation in vehicle. Then, repeat step 45) to verify fuel vapor leak no longer exists, disregarding Action To Take direction in that step. For EVAP system passing leak test, perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . For EVAP system failing leak test, go to next step. If an audible change around EVAP canister CV solenoid assembly is not indicated, go to next step.
48. 52) Check For EVAP System Leak From EVAP Test Port To EVAP Canister Assembly Disconnect EVAP canister tube (from fuel tank) at fuel vapor tee between EVAP canister purge valve and EVAP canister (or at F-fitting on EVAP canister). Plug (cap) fuel vapor tee (or F-fitting on EVAP canister). Close CV solenoid by accessing Output Test Mode on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa) at evaporative service port. Access ultra-sonic detector from EVAP System Leak Tester kit. Slowly pass detector probe from EVAP return tube (intake manifold to EVAP canister purge valve) to EVAP canister assembly. If a sudden audible change is indicated, replace fuel vapor hoses/tubes or damaged components as necessary. Remove plug from fuel vapor tee or F-fitting. Reconnect EVAP canister tube and go to next step. If a sudden audible change is not indicated, go to step 54) .
49. 53) Verification Of Repair Between EVAP Test Port To EVAP Canister Assembly Perform leak test outlined in step 45) , disregarding Action To Take direction in that step. If pressure on EVAP system stays above 1.99 kPa (8 in. H2O) and passes leak test, remove EVAP System Leak Tester equipment from evaporative test port. Make sure fuel filler cap is off before proceeding to next step. Go to step 56) . If pressure on EVAP system does not stay above 1.99 kPa (8 in. H2O) and fails leak test, remove EVAP System Leak Tester equipment from evaporative test port and go to next step.
50. 54) Check For EVAP System Leak From Fuel Tank To EVAP Canister Tube Disconnect EVAP canister tube (from fuel tank) at fuel vapor tee between EVAP canister purge valve and EVAP canister. Plug open end of EVAP canister tube (or at F-fitting on EVAP canister). Install EVAP System Leak Tester at fuel filler pipe. Pressurize EVAP system from 26-28 in. H2O (6.47-6.97 kPa). Access ultra-sonic detector from EVAP System Leak Tester kit. Slowly pass detector probe over fuel filler pipe, fuel tank, fuel vapor vent valve assembly, fuel vapor control valve tube assembly, FTP sensor and EVAP canister tube (fuel vapor tube from fuel vapor control valve to EVAP canister). If a sudden audible change is indicated, leave EVAP System Leak Tester equipment connected at fuel filler pipe. Replace damaged fuel vapor hoses/tubes. After repair, go to next step. If a sudden audible change is not indicated, remove plug from EVAP canister tube. Reconnect EVAP canister tube and fuel filler cap. Transfer EVAP System Leak Tester equipment from fuel filler pipe to evaporative test port. Rerun EVAP system leak test outlined in step 45) to verify leak no longer exists. Go to step 56) .
51. 55) Verification Of Repair Between Fuel Tank & EVAP Canister Pressurize EVAP system to 14 in. H2O (3.48 kPa) and perform leak test. If pressure on EVAP system stays above 1.99 kPa (8 in. H2O) and passes leak test, remove plug from EVAP canister tube. Reconnect EVAP canister tube and fuel filler cap. Transfer EVAP System Leak Tester equipment from fuel filler pipe to evaporative test port. Rerun EVAP system leak test outlined in step 45) to verify leak no longer exists. Go to next step. If pressure on EVAP system does not stay above 1.99 kPa (8 in. H2O) and fails leak test, repeat step 54) to isolate additional source of fuel vapor leak.
52. 56) Check For Fuel Tank Pressure Sensor Function With Fuel Filler Cap Removed Remove fuel filler cap. Connect scan tool. Key on, engine off. Access VPWR PID. If VPWR PID not greater than 10.5 volts, refer to step 61) to charge system. Then, return to this test step. Access FTP V PID. Key off. If FTP V PID voltage is between 2.40-2.80 volts with fuel filler cap off, go to next step. If FTP V PID voltage is not between 2.40-2.80 volts with fuel filler cap off, replace FTP sensor. Repeat this step to verify repair, then go to next step.
53. 57) Fuel Tank Pressure Sensor Functional Check With Pressure Applied To EVAP System Install EVAP System Leak Tester equipment at fuel filler pipe. Plug canister vent hose assembly or close (tape CV filter shut) CV solenoid to atmosphere. Key on, engine off. Access FTP (FTP V) PID on scan tool. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Key off. If FTP (FTP V) PID reading is 12.5-15.5 in. H2O (3.11-3.86 kPa) or 4.22-4.90 volts with pressure applied to EVAP system, remove EVAP System Leak Tester equipment from fuel filler pipe. Reconnect fuel filler cap. Remove plug from canister vent hose assembly or tape from CV solenoid. Go to next step. If FTP (FTP V) PID reading is not 12.5-15.5 in. H2O (3.11-3.86 kPa) or 4.22-4.90 volts with pressure applied to EVAP system, replace damaged FTP sensor. Repeat steps 56) and 57) to verify repair. Go to next step.
54. 58) Check For EVAP Canister Purge Valve Operation With Engine At Idle Remove plug and connect EVAP return tube at intake manifold vacuum source. Key on, engine off. Access EVAPPDC PID and FTP V PID on scan tool. Start engine. Observe EVAPPDC PID and FTP V PID. Idle engine until EVAPPDC PID reaches a minimum of 40% duty cycle. If FTP V PID reads less than 2.60 volts, perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If FTP V PID does not read less than 2.60 volts, go to next step.
55. 59) Check For Intake Manifold Vacuum To EVAP Canister Purge Valve Disconnect input port vacuum hose and EVAP return tube at EVAP canister purge valve. Install vacuum gauge in. Hg (in. kPa) to open end of input port vacuum hose and plug open end of EVAP return tube. Start engine. Observe vacuum gauge for manifold vacuum and record reading. Key on, engine off. Install vacuum gauge to EVAP return tube and plug open end of input port vacuum hose. Start engine and observe vacuum gauge for manifold vacuum. If both vacuum gauge readings are between 14-20 in. Hg (47.28-67.54 kPa), remove vacuum gauge and replace EVAP canister purge valve. Reconnect input port vacuum hose and EVAP return tube to EVAP canister purge valve. Rerun EVAP System Leak Test at evaporative test port to verify repair. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) . If both vacuum gauge readings are not between 14-20 in. Hg (47.28-67.54 kPa), check for blockage in input port vacuum hose or EVAP return tube. Check intake manifold tree or port for debris or obstructions. Replace or repair as necessary. If fuel vapor hoses/tube are replaced, rerun EVAP System leak test at evaporative test port to verify repair. Repeat step 58) to verify blockage repair.
56. 61) Regulate VPWR To Canister Vent (CV) Solenoid Key off. Measure voltage across battery terminals. Complete Evaporative Emission System leak test in step that directed you here. If voltage less than 12 volts, recharge battery until VPWR PID on scan tool reads in excess of 11.0 volts in KOEO. An optional procedure is to apply voltage between 12.0-13.5 volts from voltage source to VPWR input at CV solenoid. Return to step that directed you here to complete Evaporative Emission System leak test. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 61) to step 65). No test procedures have been omitted.
57. 65) DTC P1451: Check VPWR Voltage To CV Solenoid Diagnostic Trouble Code (DTC) P1451 indicates that Self-Test has detected a Canister Vent (CV) solenoid circuit failure. Possible causes: VPRW circuit open. CV circuit open. CV circuit shorted to PWR GND. CV circuit shorted to PWR. Damaged CV solenoid. Damaged PCM. Key off. Disconnect CV solenoid. Key on, engine off. Measure VPWR circuit voltage at CV solenoid harness connector. Key off. If voltage greater than 10.5 volts, go to next step. If voltage not greater than 10.5 volts, repair open circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
58. 66) Check CV Solenoid Resistance Measure CV solenoid resistance. If resistance between 48-65 ohms, go to next step. If resistance not between 48-65 ohms, replace damaged CV solenoid. Restore vehicle. Rerun EVAP System Leak Test at evaporative test port to verify repair. Perform Vehicle Preparation for Monitor Repair Verification Drive Cycle and rerun Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle. See «EVAP RUNNING LOSS MONITOR SYSTEM REPAIR VERIFICATION DRIVE CYCLE»(ref-24082-S05863267322002032300000) .
59. 67) Check For Open CV Circuit Between PCM & CV Solenoid Install breakout box, leave PCM disconnected. Measure resistance of CV circuit between PCM test pin No. 67 and CV solenoid harness connector. If resistance less than 5.0 ohms, go to next step. If resistance not less than 5.0 ohms, repair open circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
60. 68) Check CV Circuit For Short To PWR GND In Harness Disconnect scan tool from DLC. Measure resistance between PCM test pin No. 67 and PCM test pins No. 51 and 103. If both resistances greater than 10,000 ohms, reconnect scan tool. Go to next step. If both resistances not greater than 10,000 ohms, repair short circuit. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
61. 69) Check CV SIG Circuit For Short To PWR Or Chassis GND In Harness Key on, engine off. Measure voltage between PCM test pin No. 67 and chassis ground. Key off. If voltage is less than 1.0 volt, go to next step. If voltage is not less than 1.0 volt, repair short circuit to VPWR, VREF or chassis ground. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
62. 70) Check CV Voltage Signal From PCM Key off. Connect PCM to breakout box. Connect CV solenoid. Connect digital multimeter between PCM test pin No. 67 and PCM test pin No. 51 or 103. Start engine. Observe voltage on digital multimeter. If voltage is between 10.0-14.0 volts, replace PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is not between 10.0-14.0 volts, replace damaged CV solenoid. Remove breakout box. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 70) to step 76). No test procedures have been omitted.
63. 76) DTC P0460: Check Fuel Tank Level Indicators Diagnostic Trouble Code (DTC) P0460 indicates Fuel Level Input (FLI) circuit malfunction due to low or high FLI circuit input to PCM, or mechanically stuck fuel pump (FP) module. Possible causes: Empty fuel tank. Overfilled fuel tank. Mechanically stuck open or closed FP module. Incorrect fuel gauge. Damaged fuel gauge or instrument cluster. FLI circuit open. CASE GND circuit open. FLI circuit shorted to CASE GND or PWR GND. FLI shorted to VPWR. CASE GND shorted to VPWR. Damaged PCM. Connect scan tool. Key on, engine off. Observe and record fuel gauge reading. Access FLI PID. If both fuel gauge and FLI PID indicate between 1/4 (25% on FLI PID) and 3/4 (75% on FLI PID) filled, go to step 78) . If both fuel gauge and FLI PID do not indicate between 1/4 (25% on FLI PID) and 3/4 (75% on FLI PID) filled, inspect fuel tank for leaks with key off. Repair fuel tank if necessary. If DTC P0460 is set, go to next step. If fuel gauge is inoperative and DTC P0460 not set, check fuel gauge operation. Repair as necessary.
64. 77) Check For Low Fuel Level Key on, engine off. While observing both fuel gauge and FLI PID, add 2-3 gallons (7.57-11.36 liters) of fuel to fuel tank. Key off. If either fuel gauge or FLI PID indicates a movement upward as fuel is added, fuel level in tank ranges from low to empty. Drain or fill fuel tank from 25 to 75% level. Complete PCM Reset to clear DTCs. Rerun Quick Test. If DTC P0460 is still present, go to step 79) . If either fuel gauge or FLI PID does not indicate a movement upward as fuel is added, go to 81) .
65. 78) Check FLI Voltage On Scan Tool Key on, engine running. Access FLI V PID. Key off. If FLI V PID voltage is between 6.35-4.55 volts, check for mechanically stuck fuel pump (FP) Module. Repair or replace fuel pump assembly as necessary. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If the FLI V PID voltage is not between 6.35-4.55 volts, go to next step.
66. 79) FLI Circuit Voltage Comparison Check At Breakout Box & Scan Tool Install breakout box, connect PCM to breakout box. Key on, engine running. Access FLI V PID. Measure voltage between PCM test pins No. 9 and 91. Key off. If both voltage readings at breakout box and scan tool are between 6.35-4.55 volts, go to next step. If both voltage readings at breakout box and scan tool are not between 6.35-4.55 volts, check for installation of proper fuel gauge. If fuel gauge is replaced, rerun this step. Otherwise, continue the following diagnosis: If only one of voltage readings is not within specified range, replace PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If both voltage readings are not within specified range, go to step 81) .
67. 80) Case GND Circuit Voltage Comparison Check At Breakout Box & Scan Tool Key on, engine running. Access CAS GND PID. Measure voltage between PCM test pins No. 25 and 91. Key off. If both voltage readings at breakout box and scan tool are less than or equal to 0.30 volt, restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If DTC P0460 still present, check case ground. If only one of voltage readings is greater than 0.30 volt, replace PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If both voltage readings are greater than 0.30 volt, go to next step.
68. 81) Check Fuel Pump Module Resistance Disconnect Fuel Pump (FP) module. Measure resistance between FLI and CASE GND pins at FP module pigtail. If resistance between 15-160 ohms, reconnect FP module and go to next step. If resistance not between 15-160 ohms, replace fuel pump assembly. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
69. 82) Check FLI & CASE GND Circuits For Short To VPWR Install breakout box, connect PCM to breakout box. Key on, engine off. Measure voltage between PCM test pin No. 9 and PCM test pins No. 51 or 103. Measure voltage between PCM test pin No. 25 and PCM test pins No. 51 or 103. Key off. If any voltage readings were greater than 10.5 volts, go to next step. If any voltage readings were not greater than 10.5 volts, go to step 84) .
70. 83) Check FLI & CASE GND Circuits For Short To VPWR In Harness Key on, engine off. Disconnect PCM. Measure voltage between PCM test pin No. 9 and PCM test pin No. 51 or 103. Measure voltage between PCM test pin No. 25 and PCM test pin No. 51 or 103. If any voltage readings were greater than 10.5 volts, repair short to VPWR in FLI or CASE GND circuits. Restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If any voltage readings were not greater than 10.5 volts, replace PCM. Restore vehicle. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .
71. 84) Check FLI Circuit For Open Or Short To GND In Harness Disconnect PCM and battery. Measure resistance between PCM test pins No. 9 and 25. If resistance within +/- 27 ohms of reading recorded in step 81) , restore vehicle. Complete PCM Reset to clear DTCs. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . If DTC P0460 still present, replace PCM. Verify symptom no longer exists. If resistance not within +/- 27 ohms of reading recorded in step 81) , check FLI and CASE GND circuits. Repair as necessary. If resistances greater than 10,000 ohms, repair FLI or CASE GND open circuit between FP module, instrument cluster and PCM. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) . For all other resistances, repair FLI short circuit to PWR GND or CASE GND. Rerun Quick Test. See «QUICK TEST»(ref-24082-S37578241852001010400000) .

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 Service Code Or DTC Application 90 Pass P0301 Cylinder No. 1 (Test Pin No. 75) P0302 Cylinder No. 2 (Test Pin No. 101) P0303 Cylinder No. 3 (Test Pin No. 74) P0304 Cylinder No. 4 (Test Pin No. 100) P0305 Cylinder No. 5 (Test Pin No. 73) P0306 Cylinder No. 6 (Test Pin No. 99) P0307 Cylinder No. 7 (Test Pin No. 72) P0308 Cylinder No. 8 (Test Pin No. 98)

1. 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. 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»(ref-24082-S08894339852001010400000) .
3. 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. 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. 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. 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. 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»(ref-24082-S08894339852001010400000) , step 8). If spark output voltage is not as specified, go to next step.
8. 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. 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. 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. 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

Scheme 62

1. Crankshaft Position (CKP) sensor.
2. CKP wiring harness or connector(s).
3. Spark plug wires.
4. Faulty Powertrain Control Module (PCM). (Scheme 62): Identifying CKP Sensor Connector Terminals & Test Circuits

1. 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. 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. 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. 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-24082-S37578241852001010400000) . If voltage is not 1-2 volts, go to next step.
5. 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. 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-24082-S37578241852001010400000) . If resistance is 10,000 ohms or less, repair CKP- circuit short to ground.
7. 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-24082-S37578241852001010400000) . If voltage is 0.5 volts or more, repair CKP sensor short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
8. 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, proceed as follows: Go to step 1) under «CIRCUIT TEST JE»(ref-24082-S08075384582001010400000) . Go to step 20) under «CIRCUIT TEST JE»(ref-24082-S08075384582001010400000) .
9. 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-24082-S37578241852001010400000) .
10. 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. 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. 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-24082-S37578241852001010400000) .
13. 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-24082-S37578241852001010400000) . If resistance is 1050 ohms or more, repair open in CKP- circuit.
14. 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 is still present, go to TESTS W/O CODES article in this section.
15. 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-24082-S37578241852001010400000) . If resistance is 1000 ohms or less, repair CKP- circuit short to CKP+ circuit.
16. 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. 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-24082-S37578241852001010400000) . If resistance is 10,000 ohms or more, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
18. 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-24082-S37578241852001010400000) . If resistance is 0.5 volt or less, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 63

Scheme 64

Scheme 65

1. Ignition coil packs.
2. Ignition coil wiring harness.
3. Powertrain Control Module (PCM). (Scheme 63): Identifying 4-Tower Coil Pack Test Circuits & Connector Terminals (Scheme 64): Identifying Horizontal 6-Tower Coil Pack Test Circuits & Connector Terminals (Scheme 65): Identifying Vertical 6-Tower Coil Pack Test Circuits & Connector Terminals

1. 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, go to step 50) of «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . If consistent spark is not present, go to next step.
2. 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. 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-24082-S37578241852001010400000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
4. 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. 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. 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. 7) Check C2 Circuit At ICM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and J52 (C2). 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.
8. 8) Check C1 Circuit At Coil Turn ignition off. Disconnect coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J3 (C1) 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. 9) Check C2 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J6 (C2) and J7 (B-). If DC voltage is 0.5 volt or more, go to step 17). If DC voltage is less than 0.5 volt, go to next step.
10. 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 (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-24082-S37578241852001010400000) .
11. 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-24082-S37578241852001010400000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
12. 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-24082-S37578241852001010400000) .
13. 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-24082-S37578241852001010400000) .
14. 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-24082-S37578241852001010400000) .
15. 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-24082-S37578241852001010400000) . NOTE: If C2 circuit is shorted to ground, coil damage may occur.
16. 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-24082-S37578241852001010400000) . If voltage is 0.5 volt or more, repair C1C circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
17. 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-24082-S37578241852001010400000) . If voltage is 0.5 volt or more, repair C2C circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 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. 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. 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. 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 J7 (B-) and J11 (COIL VBAT). 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 front coil. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
22. 24) Check C3 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 32).
23. 25) 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 34).
24. 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 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.
25. 27) 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 voltage is 10.0 volts or less, repair open in C4 circuit.
26. 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 J10 (LC3C) 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 36).
27. 29) Check C4 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J18 (LC4C) 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 37).
28. 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 J1 (B+) and J10 (LC3C). 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-24082-S37578241852001010400000) .
29. 31) Check C4 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J18 (LC4C). Crank engine. If test light blinks brightly once every engine revolution, replace left coil pack and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
30. 32) 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 front coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
31. 33) 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-24082-S37578241852001010400000) . NOTE: If C3 circuit is shorted to ground, coil damage may occur.
32. 34) Check C4 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J18 (LC4C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace front coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
33. 35) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J18 (LC4C) 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-24082-S37578241852001010400000) . NOTE: If C4 circuit is shorted to ground, coil damage may occur.
34. 36) Turn ignition on. Measure voltage between breakout box test pins J10 (LC3C) and J7 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volts or more, repair C3 circuit short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
35. 37) Check C3 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J18 (LC4C) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volt or more, repair C4 circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
36. 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-24082-S37578241852001010400000) . If no faults are found, go to next step.
37. 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 J5 (COIL VBAT) 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-24082-S37578241852001010400000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
38. 40) 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 48).
39. 41) Check C2 Circuit At Right Coil Pack Turn ignition on. Measure voltage between breakout box test pins J6 (RC2C) 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 50).
40. 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 pin J7 (B-) and test pin No. 26 (RC1) 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. 43) 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.
42. 44) Check C1 Circuit At Coil Turn ignition off. Disconnect rear coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J23 (RC1C) 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 52).
43. 45) Check C2 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J6 (RC2C) 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 53).
44. 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 J1 (B+) and J3 (RC1C). 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-24082-S37578241852001010400000) .
45. 47) Check C2 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J6 (RC2C). Crank engine. If test light blinks brightly once every engine revolution, replace rear coil pack and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
46. 48) Check C1 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J3 (RC1C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace rear coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
47. 49) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J3 (RC1C) 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-24082-S37578241852001010400000) . NOTE: If C1 circuit is shorted to ground, coil damage may occur.
48. 50) Check C2 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J6 (RC2C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace rear coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
49. 51) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J6 (RC2C) 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-24082-S37578241852001010400000) . NOTE: If C2 circuit is shorted to ground, coil damage may occur.
50. 52) Check C1 Circuit Turn ignition on. Measure voltage between breakout box test pins J3 (RC1C) and J7 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volts or more, repair C1 circuit short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
51. 53) Check C2 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J6 (RC2C) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volt or more, repair C2 circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 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. 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. 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-24082-S37578241852001010400000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
55. 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. 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. 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. 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 (C1). 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 and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
59. 67) Check C2 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and J52 (C2). 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. 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. 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. 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. 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. 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-24082-S37578241852001010400000) .
65. 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-24082-S37578241852001010400000) .
66. 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-24082-S37578241852001010400000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
67. 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-24082-S37578241852001010400000) .
68. 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-24082-S37578241852001010400000) . NOTE: If C1 circuit is shorted to ground, coil damage may occur.
69. 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-24082-S37578241852001010400000) .
70. 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-24082-S37578241852001010400000) . NOTE: If C1 circuit is shorted to ground, coil damage may occur.
71. 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-24082-S37578241852001010400000) .
72. 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-24082-S37578241852001010400000) .
73. 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-24082-S37578241852001010400000) .
74. 82) Check C2 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-24082-S37578241852001010400000) .
75. 83) Check C3 Circuit 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-24082-S37578241852001010400000) . 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. 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. Go to step 50) of «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . If consistent spark is not present, go to next step.
77. 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. 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. 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 VBAT) 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-24082-S37578241852001010400000) .
80. 94) Check C3 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. 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. 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. 97) Check C4 Circuit At PCM Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and test pin No 104 (LC4) 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. 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 is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 106).
85. 99) Check C4 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J18 (LC4C) 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. 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 (LC3C). 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-24082-S37578241852001010400000) .
87. 101) Check C4 Circuit At Coil While Cranking Connect incandescent test light between breakout box test pins J1 (B+) and J18 (LC4C). Crank engine. If test light blinks brightly once every engine revolution, replace cylinder No. 2 coil pack and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
88. 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 cylinder No. 2 coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
89. 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-24082-S37578241852001010400000) . NOTE: If C3 circuit is shorted to ground, coil damage may occur.
90. 104) Check C4 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J18 (LC4C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace cylinder No. 2 coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
91. 105) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J18 (LC4C) 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-24082-S37578241852001010400000) . NOTE: If C4 circuit is shorted to ground, coil damage may occur.
92. 106) Check C3 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J10 (LC3C) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If DC voltage is 0.5 volt or more, repair C3 circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
93. 107) Check C4 Circuit Turn ignition off. Disconnect PCM wiring harness connector. Turn ignition on. Measure voltage between breakout box test pins J18 (LC4C) and J7 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volts or more, repair C4 circuit short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
94. 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-24082-S37578241852001010400000) . If no faults are found, go to next step.
95. 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 VBAT) 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-24082-S37578241852001010400000) . WARNING: Unless otherwise instructed, PCM must not be connected to breakout box when performing ignition system testing.
96. 110) Check C1 Circuit At 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. 111) Check C2 Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J6 (RC2C) 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. 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 (RC1) 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. 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. 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 (RC1C) 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 122).
101. 115) Check C2 Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J6 (RC2C) 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 123).
102. 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 (RC1C). 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-24082-S37578241852001010400000) .
103. 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 cylinder No. 1 coil pack and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If test light does not blink as indicated, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
104. 118) Check C1 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J3 (RC1C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace cylinder No. 1 coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
105. 119) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J3 (RC1C) 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-24082-S37578241852001010400000) . NOTE: If C1 circuit is shorted to ground, coil damage may occur.
106. 120) Check C2 Circuit Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J6 (RC2C) and J7 (B-). If resistance is less than 2000 ohms, go to next step. If resistance is 2000 ohms or more, replace cylinder No. 1 coil pack. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
107. 121) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J6 (RC2C) 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-24082-S37578241852001010400000) . NOTE: If C2 circuit is shorted to ground, coil damage may occur.
108. 122) Check C1 Circuit Turn ignition off. Disconnect PCM wiring harness connector. Turn ignition on. Measure voltage between breakout box test pins J3 (RC1C) and J7 (B-). If voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volts or more, repair C1 circuit short to power and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
109. 123) Check C2 Circuit Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J6 (RC2C) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volt or more, repair C2 circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 66

1. Ignition Coils.
2. Ignition Coils Harness.
3. Powertrain Control Module (PCM). (Scheme 66): Identifying Coil On Plug Ignition Coil Test Circuit & Connector Terminals

1. 1) Continuous Memory DTC P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P0359 & P0360 Check spark plug and connectors for damage, looseness or shorting. Check coils and coil boots for damage, looseness or shorting. Repair or replace as necessary. If no faults are found, go to next step.
2. 2) Check Resistance Between Coil Pins & Spring Terminal Turn ignition off. Remove suspect ignition coil. Measure resistance between B+ circuit terminal and coil spring. Measure resistance between CD circuit terminal and coil spring. If both resistance measurements are 4000-10,000 ohms, go to next step. If resistance is not as specified, replace coil and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
3. 3) Check Resistance Between Coil Pins Leave ignition off. Measure resistance between coil terminals. If resistance is 0.3-0.8 ohms, go to next step. If resistance is not as specified, replace coil and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
4. 4) Check Coil B+ Circuit Signal Leave ignition off. Disconnect PCM 104-pin connector. Turn ignition on. Measure voltage between ground and suspect coil B+ terminal. If voltage is 10 volts or more, turn ignition off. Reconnect PCM harness connector and go to next step. If voltage is less than 10 volts, check fuses and B+ circuit for open or short. Repair as necessary and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
5. 5) Perform «QUICK TEST»(ref-24082-S37578241852001010400000) If DTC P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P0359 or P0360 are present, go to step 7). If specified DTCs are not present, go to next step.
6. 6) If DTC P0340 and P0350 are present, go to step 1) of «CIRCUIT TEST DR»(ref-24082-S42378584282001010400000) . If specified DTCs are not present, go to step 5) of «CIRCUIT TEST HD»(ref-24082-S08894339852001010400000) .
7. 7) Check For Power To Coil Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950). Use appropriate overlay. Connect 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 J31 (COIL+) 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-24082-S37578241852001010400000) .
8. 8) Measure voltage between breakout box test pins J32 (COIL-) and J7 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, go to step 11).
9. 9) Check For Coil At Connector Turn ignition off. Disconnect coil tee. Turn ignition on. Measure voltage between breakout box test pins J32 (COIL-) and J7 (B-). If voltage is 0.5 volts or less, go to next step. If voltage is more than 0.5 volts, go to step 13).
10. 10) Check 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 J32 (COIL-). 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-24082-S37578241852001010400000) .
11. 11) Check For Coil Short To Ground Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance between breakout box test pins J32 (COIL-) 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-24082-S37578241852001010400000) .
12. 12) Leave ignition off. Disconnect PCM wiring harness connector. Measure resistance between breakout box test pins J32 (COIL-) 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-24082-S37578241852001010400000) .
13. 13) Check Coil For Short To Power Turn ignition off. Disconnect PCM from vehicle harness connector. Turn ignition on. Measure voltage between breakout box test pins J32 (Coil-) and J7 (B-). If DC voltage is less than 0.5 volt, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If voltage is 0.5 volt or more, repair circuit short to power. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .

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

Scheme 67

Scheme 68

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). (Scheme 67): Typical Fuel Pump Relay Schematic (Scheme 68): Identifying Fuel System Test Circuit & Connector Terminals

1. 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. NOTE: To Identify fuel pump relay terminals, refer to numbers molded on relay.
2. 2) Check Fuel Pump Relay Turn ignition off. Leave fuel pump relay disconnected. Measure resistance between terminals No. 1 or No. 85 and all other terminals. Resistance should be either 40-120 ohms, or greater than 10,000 ohms. Replace fuel pump relay if resistance is not as specified. If resistance is okay, go to next step.
3. 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-24082-S37578241852001010400000) .
4. 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-24082-S37578241852001010400000) .
5. 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 with DTC P0230, go to next step. If resistance is less than 5 ohms and specified DTCs are not present, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
6. 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-24082-S37578241852001010400000) . If scan tester does not indicate YES or ON, go to next step.
7. 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-24082-S37578241852001010400000) . 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. 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. 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. 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-24082-S37578241852001010400000) . If fuel pump still does not operate, replace fuel pump relay and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
11. 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 terminal 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-24082-S37578241852001010400000) .
12. 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-24082-S37578241852001010400000) .
13. 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-24082-S37578241852001010400000) .
14. 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-24082-S37578241852001010400000) .
15. 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-24082-S37578241852001010400000) .
16. 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 and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
17. 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-24082-S37578241852001010400000) .
18. 20) KOEO & KOER DTC P0231 If engine starts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If engine does not start, go to next step.
19. 21) Check B+ To Fuel Pump Relay Turn ignition off. Disconnect fuel pump relay wiring harness connector. Measure voltage between chassis ground and IGN START/RUN terminal at fuel pump relay wiring harness connector. Measure voltage between chassis ground and B+ terminal at fuel pump relay 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-24082-S37578241852001010400000) .
20. 22) Check POWER-TO-PUMP Circuit Resistance Leave ignition off and fuel pump relay disconnected. Measure resistance between negative battery terminal and POWER-TO-PUMP terminal at fuel pump relay wiring harness connector. If resistance is less than 10 ohms, replace fuel pump relay and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If resistance is 10 ohms or more, repair open in POWER-TO-PUMP circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . 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. 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»(ref-24082-S16577748702001010400000) . 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. 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»(ref-24082-S16577748702001010400000) . 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. 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

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

Scheme 69

Scheme 70

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). (Scheme 69): Typical Fuel Pump Relay Schematic (Scheme 70): Identifying Fuel Shutoff System Test Circuit & Connector Terminals

Scheme 71

1. 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. 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. (Scheme 71): Identifying Fuel Shutoff Valve Relay Terminals (Contour)
3. 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-24082-S37578241852001010400000).
4. 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-24082-S37578241852001010400000).
5. 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 is less than 5 ohms and specified DTCs are not present, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
6. 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 FSVF PID. If scan tester indicates YES, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If scan tester does not indicate YES, go to next step.
7. 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-24082-S37578241852001010400000). 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. 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. 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. 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-24082-S37578241852001010400000). 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»(ref-24082-S37578241852001010400000).
11. 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-24082-S37578241852001010400000). If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
12. 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-24082-S37578241852001010400000).
13. 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 between IFS switch and FSVM connection. Clear PCM memory and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
14. 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 is 10 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 20) DTC P0231 If engine starts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If engine does not start, go to next step. For Continuous Memory DTC P0231, go to step 35).
16. 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-24082-S37578241852001010400000).
17. 22) Check POWER-TO-FUEL SHUTOFF VALVES Circuit Resistance Leave ignition off and fuel shutoff valve relay disconnected. Measure resistance between negative battery terminal and POWER-TO-FUEL SHUTOFF VALVES terminal at wiring harness connector. If resistance is less than 10 ohms, replace fuel shutoff valve relay and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If resistance is 10 ohms or more, repair open in POWER-TO-FUEL SHUTOFF VALVES circuit and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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»(ref-24082-S16577748702001010400000). 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. 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»(ref-24082-S16577748702001010400000). 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. 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»(ref-24082-S16577748702001010400000).

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

Scheme 72

Scheme 73

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). (Scheme 72): Identifying IAC Circuit & Connector Terminals (Contour) (Scheme 73): Identifying IAC Circuit & Connector Terminals (Mystique)

Scheme 74

1. 1) DTC P0505, P1504 Or P1507 Perform «KOER SELF-TEST»(ref-24082-S07955820122001010400000). 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. 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-24082-S37578241852001010400000).
3. 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-24082-S37578241852001010400000).
4. 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-24082-S37578241852001010400000).
5. 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-24082-S37578241852001010400000). If air filter is okay, go to next step.
6. 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. 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-24082-S37578241852001010400000). If resistance is less than 5 ohms, go to next step.
8. 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-24082-S37578241852001010400000). If voltage is less than one volt, go to next step.
9. 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 is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair circuit short to ground and repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
10. 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-24082-S37578241852001010400000). If voltage is not 3.0-11.5 volts, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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. 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 74) 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-24082-S37578241852001010400000). If vacuum is not bled off immediately, go to next step. (Scheme 74): Identifying EVAP Canister Purge Hose Ports
13. 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-24082-S37578241852001010400000).
14. 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-24082-S37578241852001010400000). If resistance is less than 10,000 ohms, repair circuit short to ground and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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. 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. 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-24082-S37578241852001010400000). If air filter is okay, go to next step.
17. 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»(ref-24082-S31368686412001010400000). If no faults are present, go to step 8) under «CIRCUIT TEST HU»(ref-24082-S31368686412001010400000). 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. 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 faults are found, isolate and repair as necessary. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If no faults are found, problem cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000).

PCM determines engine cooling fan requirements and controls fan operation through Low Fan Control (LFC) and High Fan Control (HFC) circuits. HFC relay is normally open.

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

Scheme 75

1. Wiring harness circuits (LFC, HFC, FC, Power-To-Fan, IGN START/RUN, VPWR and GND).
2. Fan Control (FC) relay, Low Fan Control (LFC) relay and High Fan Control (HFC) relay.
3. Powertrain Control Module (PCM). NOTE: During diagnosis, use «CIRCUIT PIN IDENTIFICATION»(ref-24082-S20687922372001010400000) table to determine correct breakout box test pin, circuit and relay being tested. CIRCUIT PIN IDENTIFICATION DTC Circuit/Relay Breakout Box Pin No. P1474 LFC 45 P1479 HFC 46

1. 1) DTC P1474 & P1479: Check For VPWR To Applicable Fan Control Relay DTC P1474 indicates a Low Speed Fan Control (LFC) or Fan Control (FC) primary circuit failure. DTC P1479 indicates a High Speed Fan Control (HFC) primary circuit failure. Possible causes are: Open or shorted FC, LFC or HFC circuit. Open VPWR circuit to fan control relay. Faulty fan control relay (FC, LFC or HFC). Faulty PCM. Turn ignition off. Disconnect appropriate fan control relay. Turn ignition on. Using a voltmeter, measure voltage between VPWR circuit at appropriate fan control relay harness connector and negative battery terminal. If reading is greater than 10.5 volts, go to next step. If reading is not as specified, repair open in VPWR circuit to appropriate fan control relay. Reconnect fan control relay. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
2. 2) Check For FC, LFC Or HFC Circuit Cycling Install scan tool. Turn ignition on, engine off. Disconnect appropriate fan control relay. Access OUTPUT TEST MODE on scan tool. Connect a test light between VPWR circuit and FC, LFC or HFC circuit at appropriate fan control relay harness connector. Using scan tool, command appropriate cooling fan speed on, then off. If test light toggles on, then off, replace appropriate fan control relay. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If operation is not as specified, turn ignition off, remove test light and go to next step.
3. 3) Check FC, LFC Or HFC Circuit For Short To Power Turn ignition off. Disconnect appropriate fan control relay. Disconnect PCM harness connectors. Check for corroded, damaged or backed-out terminal pins. Repair as necessary. Turn ignition on, engine off. Using a voltmeter, measure voltage between FC, LFC or HFC circuit at appropriate fan control relay harness connector and negative battery terminal. Turn Ignition off. If reading is less than one volt with ignition on or off, go to next step. If reading is not as specified, repair FC, LFC or HFC circuit for short to power. Reconnect all components and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If operation is not as specified, turn ignition off, remove test light and go to next step.
4. 4) Check FC, LFC Or HFC Circuit For Short To Ground Turn ignition off. Disconnect scan tool. Disconnect appropriate fan control relay. Disconnect PCM harness connectors. Install breakout box, leaving PCM disconnected. Using an ohmmeter, measure resistance between appropriate fan control circuit test pin (FC, LFC or HFC) and test pins No. 51, 91 and 103 at breakout box. If each resistance is greater than 10 k/ohms, go to next step. If resistance is not as specified, repair fan control circuit that is shorted to ground. Remove breakout box. Reconnect all components and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) .
5. 5) Check FC, LFC Or HFC Circuit Resistance Turn ignition off. Disconnect appropriate fan control relay. Install breakout box, leaving PCM disconnected. Using an ohmmeter, measure resistance between appropriate fan control circuit test pin (FC, LFC or HFC) at breakout box and FC, LFC or HFC circuit at appropriate fan control relay harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is not as specified, repair open in FC, LFC or HFC circuit. Remove breakout box. Reconnect all components and repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 10). No test procedures have been omitted.
6. 10) Continuous Memory DTC P1474 Continuous memory DTC P1474 indicates an FC or LFC circuit failure occurred during vehicle operation. Possible causes are: Open VPWR circuit to FC or LFC relay. Open or shorted FC or LFC circuit. Turn ignition off. Ensure A/C and defroster are off. Install scan tool. Disconnect cooling fan motor harness connector(s). Check for corroded, damaged or backed-out terminal pins. Repair as necessary. Connect a test light between Power-To-Fan circuit and ground circuit at fan motor harness connector. Turn ignition on, engine off. Using scan tool, access OUTPUT TEST MODE. Command low speed fan on. Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake and bend FC or LFC circuit between PCM and FC or LFC relay. Shake and bend VPWR or IGN START/RUN circuit to FC or LFC relay. Lightly tap on FC or LFC relay to simulate road shock. If fault is indicated, turn ignition off. Isolate and repair open or short to power in wiring harness. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If fault is not indicated, go to next step.
7. 11) Check FC Or LFC Circuit For Short To Ground Turn ignition on, engine off. Ensure cooling fan motor harness connector(s) are disconnected and test light is still installed. Using scan tool, command low speed fan off. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake and bend FC or LFC circuit between PCM and FC or LFC relay. Lightly tap on FC or LFC relay to simulate road shock. If fault is indicated, isolate and repair short to ground in wiring harness. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If fault is not indicated, problem may be intermittent. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . 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.
8. 20) Continuous Memory DTC P1479 Continuous memory DTC P1479 indicates an HFC circuit failure has occurred during vehicle operation. NOTE: On vehicles equipped with one-speed cooling fans, disregard DTC P1479. Possible causes are: Open VPWR circuit to HFC relay. Open or shorted HFC circuit. Turn ignition off. Ensure A/C and defroster are off. Disconnect cooling fan motor harness connector(s). Check for corroded, damaged or backed-out terminal pins. Repair as necessary. Connect a test light between Power-To-High Speed Fan circuit and ground circuit at fan motor harness connector. Turn ignition on, engine off. Using scan tool, access OUTPUT TEST MODE. Command high speed fan on. Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake and bend HFC circuit between PCM and HFC relay. Shake and bend VPWR or IGN START/RUN circuit to HFC relay. Lightly tap on HFC relay to simulate road shock. If fault is indicated, turn ignition off. Isolate and repair open or short to power in wiring harness. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If fault is not indicated, go to next step.
9. 21) Check HFC Circuit For Short To Ground Turn ignition on, engine off. Ensure cooling fan motor harness connector(s) are disconnected and test light is still installed. Using scan tool, command high speed fan off. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake and bend HFC circuit between PCM and HFC relay. Lightly tap on HFC fan control relay to simulate road shock. If fault is indicated, turn ignition off. Isolate and repair short to ground in wiring harness. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . If fault is not indicated, problem is intermittent. Go to «CIRCUIT TEST Z»(ref-24082-S16577748702001010400000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 25). No test procedures have been omitted. NOTE: Perform this test only if no DTCs are received in QUICK TEST. Ignition should still be on and scan tool still connected with OUTPUT TEST MODE selected.
10. 25) Electric Cooling Fan Inoperative: Check For Power & Ground To Cooling Fan Motor Disconnect cooling fan motor harness connector. Using scan tool, command cooling fan on. Using a voltmeter, measure voltage between Power-To-Fan circuit terminal and ground circuit terminal at cooling fan harness connector. If reading is greater than 10.5 volts, replace cooling fan motor and recheck cooling fan operation. If reading is not as specified, remain in OUTPUT TEST MODE and go to next step.
11. 26) Check Cooling Fan Motor Ground Circuit Using a voltmeter, measure voltage between negative battery terminal and Power-To-Fan circuit terminal at cooling fan motor harness connector. If reading is greater than 10.5 volts, locate and repair open in cooling fan motor ground circuit. Recheck cooling fan operation. If reading is not as specified, go to next step.
12. 27) Check B + Circuit To Fan Control (FC) Relay Turn ignition off. Using a voltmeter, measure voltage between negative battery terminal and B + circuit terminal at FC relay harness connector. If reading is greater than 10.5 volts, go to next step. If reading is not as specified, turn ignition on and retest. If reading is still not as specified, locate and repair open in B + circuit to FC relay. Recheck cooling fan operation.
13. 28) Check Power-To-Fan Circuit Continuity Turn ignition off. Disconnect FC relay. Using an ohmmeter, measure resistance of Power-To-Fan circuit between FC relay harness connector and cooling fan motor harness connector. If resistance is less than 5 ohms, replace FC relay and recheck cooling fan operation. If resistance is not as specified, locate and repair open in Power-To-Fan circuit. Recheck cooling fan operation. 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.
14. 30) Electric Cooling Fan Problem (With No DTCs) During operational check, if cooling fan operated at one speed only, go to step 40). If cooling fan did not operate at any speed, go to next step.
15. 31) Cooling Fan Will Not Operate At Any Speed Ensure ignition is on, scan tool is connected and in OUTPUT TEST MODE, and cooling fan is commanded off. Disconnect cooling fan motor harness connector. Using scan tool, command high speed cooling fan on. Using a voltmeter, measure voltage between ground and Power-To-Fan circuit terminal at cooling fan harness connector. If reading is 10 volts or less, go to next step. If reading is greater than 10 volts, go to step 35).
16. 32) Check B + Circuit To HFC Relay Turn ignition off. Ensure cooling fan motor harness connector(s) are disconnected. Disconnect HFC relay. Using a voltmeter, measure voltage between ground and B + circuit at HFC relay harness connectors. If reading is greater than 10.5 volts, go to next step. If reading is not as specified, check for faulty B + circuit (open circuit or blown fuse/fusible link). If a fuse is blown, check for short to ground before replacing. Repair as necessary. Recheck cooling fan operation.
17. 33) Check Power-To-Fan Circuit Continuity Turn ignition off. Disconnect HFC relay. Ensure cooling fan motor harness is disconnected. Using an ohmmeter, measure resistance of Power-To-High Fan circuit between HFC relay harness connector and cooling fan harness connector. Also, measure resistance of Power-To-Low Fan circuit between LFC relay harness connector and cooling fan harness connector. If both readings are less than 5 ohms, perform the following as indicated: If reading is not as specified, locate and repair open in Power-To-High Fan circuit or Power-To-Low Fan circuit. Recheck cooling fan operation.
18. 34) Check For Power-To-Cooling Fan Motor Turn ignition off. Reconnect HFC and LFC relays. Ensure cooling fan motor harness connector is disconnected and scan tool is installed. Turn ignition on, engine off. Access OUTPUT TEST MODE. Command low speed fan on. Using a voltmeter, measure voltage between ground and Power-To-Low Speed Fan circuit at cooling fan motor harness connector. If reading is greater than 10 volts, replace HFC relay and cooling fan motor. If reading is not as specified, replace HFC and LFC relays. Recheck cooling fan operation.
19. 35) Check Cooling Fan Ground Circuit Turn ignition off. Disconnect cooling fan motor harness connector. Disconnect scan tool. Using an ohmmeter, measure resistance between ground and ground circuit terminal at cooling fan motor harness connector. If resistance is less than 5 ohms, replace cooling fan motor. If resistance not as specified, locate and repair open in ground circuit. Recheck cooling fan operation. 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. 40) Determine Which Fan Speed Is Operational If high speed fan was inoperative in step 30), go to step 46). If low speed fan was inoperative in step 30), go to step 41).
21. 41) Low Speed Fan Inoperative Ensure scan tool is connected and still in OUTPUT TEST MODE with fan commanded off. Turn ignition on, engine off. Disconnect cooling fan motor harness connector. Using scan tool, command low speed fan on. Using a voltmeter, measure voltage between ground and Power-To-Low Fan circuit terminal at cooling fan harness connector. If reading is greater than 10 volts, verify ground circuit to cooling fan motor. If ground is okay, replace fan motor and recheck cooling fan operation. If reading is not as specified, perform the following as indicated
22. 42) Check Voltage From HFC Relay To LFC Relay Disconnect LFC relay. Turn ignition on, engine off. Using a voltmeter, measure voltage between ground and B + From HFC Relay circuit terminal at LFC relay harness connector. If reading is greater than 10 volts, go to step 45). If reading is not as specified, go to step 43)
23. 43) Check Resistance Between LFC & HFC Relays Turn ignition off. Disconnect LFC and HFC relays. Using an ohmmeter, measure resistance of B + From HFC Relay circuit between LFC relay harness connector and HFC relay harness connector. Resistance is resistance is less than 5 ohms, replace HFC relay and recheck fan operation. If resistance is not as specified, locate and repair open in B + From HFC Relay circuit between LFC and HFC relays.
24. 44) Check For Power To LFC Relay Turn ignition off. Ensure LFC relay is disconnected. Using a voltmeter, measure voltage between ground and B + circuit at LFC relay harness connector. If reading is greater than 10.5 volts, go to next step. If reading is not as specified, locate cause of no B + to LFC relay (blown fuse or open circuit). If fuse is blown, check for short circuit before replacing fuse. Repair as necessary. Recheck fan operation.
25. 45) Check Power-To-Low Speed Fan Circuit Resistance Turn ignition off. Ensure LFC relay and cooling fan motor harness connector is disconnected. Using an ohmmeter, measure resistance of Power-To-Low Speed Fan circuit between LFC relay harness connector and cooling fan motor harness connector. If resistance is less than 5 ohms, replace LFC relay. If resistance is not as specified, repair open in Power-To-Low Speed Fan circuit. Recheck fan operation.
26. 46) High Speed Fan Inoperative Ensure scan tool is connected and still in OUTPUT TEST MODE with fan commanded off. Disconnect cooling fan motor harness connector. Turn ignition on, engine off. Using scan tool, command high speed fan on. Using a voltmeter, measure voltage between ground and Power-To-High Speed Fan circuit terminal at cooling fan harness connector. If reading is greater than 10 volts, verify ground circuit to cooling fan motor. If ground is okay, replace fan motor and recheck cooling fan operation. If reading is not as specified, perform the following as indicated
27. 47) Check For B + To HFC Relay Turn ignition off. Disconnect HFC relay. Using a voltmeter, measure voltage between ground and B + circuit at HFC relay harness connector. If reading is greater than 10.5 volts, go to next step. If reading is not as specified, locate cause of no B + to HFC relay (blown fuse or open circuit). If fuse is blown, check for short circuit before replacing fuse. Repair as necessary. Recheck fan operation.
28. 48) Check Power-To-High Speed Fan Circuit Resistance Turn ignition off. Ensure cooling fan motor harness connector is disconnected. Using an ohmmeter, measure resistance of Power-To-High Speed Fan circuit between HFC relay harness connector and cooling fan motor harness connector. If resistance is less than 5 ohms, replace HFC relay. If resistance is not as specified, repair open in Power-To-High Speed Fan circuit. Recheck fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 48) to step 50). No test procedures have been omitted.
29. 50) Low Speed &/Or High Speed Cooling Fan Inoperative Turn ignition off. Disconnect LFC and HFC relays. Using a voltmeter, measure voltage between ground and B + terminal at both LFC and HFC relay harness connectors. If both readings are greater than 10.5 volts, go to next step. If one or both readings are not as specified, locate and repair open in B + circuit. If fuse or fuse link was blown, check and repair cause of blown fuse or fuse link. Recheck fan operation.
30. 51) Check Power-To-Fan Circuit, Fan Ground & Internal Fan Circuits For Resistance Turn ignition off. Ensure HFC and LFC relays are disconnected. Using an ohmmeter, measure resistance between battery negative terminal and Power-To-Fan circuit terminal at both LFC and HFC relay harness connectors. If both readings are less than 15 ohms, go to next step. If one or both readings are not as specified, go to step 56).
31. 52) Check For Short To Ground In Power-To-Fan Circuit Turn ignition off. Ensure HFC and LFC relays are disconnected. Disconnect cooling fan motor(s). Using an ohmmeter, measure resistance between ground and Power-To-Fan circuit terminal at HFC relay harness connector. If resistance is greater than 10 k/ohms, go to next step. If resistance is not as specified, locate and repair short to ground in Power-To-Fan circuit. Recheck fan operation.
32. 53) Check HFC & LFC Relay Operation Ensure cooling fan motor harness connectors are disconnected. Reconnect HFC and LFC relays. With scan tool connected and in OUTPUT TEST MODE, check relays as follows: HFC Relay Turn ignition on, engine off. Using scan tool, command high speed fan on. Wait 15 seconds. Using a voltmeter, measure voltage between ground and Power-To-Fan circuit terminal at cooling fan harness connector. Reading should be greater than 10.5 volts. LFC Relay Turn ignition on, engine off. Using scan tool, command low speed fan on. Using a voltmeter, measure voltage between ground and Power-To-Fan circuit terminal at cooling fan harness connector. Reading should be greater than 10 volts. If both voltage readings are as specified, replace cooling fan motor(s). If one or both voltage readings are not as specified, replace LFC and/or HFC relay. Recheck fan operation. 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.
33. 56) Check Power-To-Fan Circuit Resistance Turn ignition off. Disconnect HFC and LFC relays. Disconnect cooling fan motor(s). Using an ohmmeter, measure resistance of Power-To-Fan circuit between cooling fan motor harness connector and both HFC and LFC relay harness connectors. If both readings are less than 15 ohms, go to next step. If one or both readings are not as specified, locate and repair open in Power-To-Fan circuit. Recheck fan operation.
34. 57) Check Cooling Fan Ground Circuit Turn ignition off. Ensure cooling fan motor harness connector is disconnected. Using an ohmmeter, measure resistance between ground and ground circuit terminal at cooling fan harness connector. If resistance is less than 5 ohms, replace inoperative cooling fan motor(s). If resistance is not as specified, locate and repair open in ground circuit. Recheck fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 57) to step 60). No test procedures have been omitted.
35. 60) Cooling Fan Always Runs Repeat «QUICK TEST»(ref-24082-S37578241852001010400000) . Service any DTCs present before continuing. If no DTCs are present, turn ignition off. Disconnect FC relay. Turn ignition on, engine off. Check cooling fan operation. If cooling fan remains on, locate and repair short to power in Power-To-Fan circuit. If cooling fan is off, replace FC relay and recheck fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 60) to step 65). No test procedures have been omitted.
36. 65) Low &/Or High Speed Cooling Fan Always Runs Ensure A/C Pressure Switch (ACPSW) is okay before proceeding with this test step. Turn A/C and defroster off. Turn ignition off. Disconnect LFC relay. Turn ignition on. If cooling fan continues to run, go to next step. If cooling fan stops, replace LFC relay. Recheck fan operation.
37. 66) Check HFC Relay Turn ignition off. Disconnect HFC and LFC relays. Turn ignition on. Check cooling fan operation. If cooling fan remains on, perform the following as indicated: Repair Power-To-Fan circuit for short to power. If cooling fan stops, replace HFC relay. Recheck fan operation.
38. 67) Check Power-To-Low Speed Fan Circuit For Short To Power Turn ignition off. Disconnect HFC and LFC relays. Ensure cooling fan motor harness connector is disconnected. Turn ignition on. Using a voltmeter, measure voltage between ground and Power-to-Low Speed Fan circuit at cooling fan motor harness connector. If reading is less than one volt, repair Power-To-High Speed Fan circuit for short to power. If reading is not as specified, repair Power-To-Low Speed Fan circuit for short to power. Recheck fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 67) to step 70). No test procedures have been omitted.
39. 70) One Cooling Fan Inoperative & Other Cooling Fan Operates Normally (With No DTCs Set) Turn ignition off. Disconnect both cooling fans. Install scan tool. Access OUTPUT TEST MODE. Command High Speed Fan On. Using a voltmeter, measure voltage between Power-To-Fan circuit and ground circuit at inoperative cooling fan harness connector. If reading is greater than 10 volts, replace inoperative cooling fan motor. Recheck fan operation. If reading is not as specified, remain in OUTPUT TEST MODE and go to next step.
40. 71) Check Power-To-Fan Circuit Using a voltmeter, measure voltage between chassis ground and Power-To-Fan circuit at inoperative cooling fan motor harness connector. If reading is greater than 10 volts, locate and repair open in cooling fan ground circuit. If reading is not as specified, locate and repair open in Power-To-Fan circuit between inoperative cooling fan motor and splice to other fan. Recheck fan operation.

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

Scheme 76

1. Wiring harness circuits (ACCS, POWER-TO-CLUTCH, VPWR and WAC).
2. Faulty WAC relay.
3. Faulty Powertrain Control Module (PCM). (Scheme 76): Identifying WAC Test Circuits & Connector Terminals

Scheme 77

Scheme 78

Scheme 79

1. 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. 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-24082-S37578241852001010400000).
3. 3) Check WAC Relay Leave ignition off and WAC relay disconnected. Check resistance between relay terminals as follows: No. 1 and 2. Replace WAC relay if resistance is not 40-120 ohms. If resistance is okay, check resistance between relay terminals as follows: No. 1 and 2, No. 1 and 4. 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-24082-S37578241852001010400000).
4. 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 is less than one volt, go to next step. If voltage is one volt or more, 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-24082-S37578241852001010400000).
5. 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-24082-S37578241852001010400000).
6. 6) Leave ignition off and relay disconnected. Measure resistance between breakout box test pin No. 69 and WAC terminal at relay harness connector. If resistance is less than 5 ohms, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). 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-24082-S37578241852001010400000). 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. 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 of 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 article in the AIR CONDITIONING & HEAT section.
8. 11) 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 low refrigerant charge.
9. 12) Check For Voltage To A/C Pressure Switch (ACPSW) Leave ignition off and A/C cycling switch disconnected. 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 in the AIR CONDITIONING & HEAT section. (Scheme 77): Identifying ACPSW Connector Terminals
10. 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. 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-24082-S37578241852001010400000).
12. 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 article in the AIR CONDITIONING & HEAT section. If ACCS PID is on, proceed as follows: Go to step 90).
13. 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. 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 vehicles without WAC relay, replace PCM and repeat «QUICK TEST»(ref-24082-S37578241852001010400000). For all other models, go to next step.
15. 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. 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. 31) Turn ignition off. Connect scan tester to Data Link Connector (DLC). Leave 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»(ref-24082-S16577748702001010400000). 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. 50) Check Voltage To A/C Clutch Turn ignition off. Disconnect A/C clutch. Connect scan tester to DLC. Turn ignition on. Using scan tester, access Output Test Mode. Command outputs on. Measure voltage between A/C clutch connector terminals. If voltage is 10.5 volts or less, check for fault in A/C demand switch, EATC module or related wiring harness. See A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT section.
19. 51) Check Voltage To A/C Relay Turn ignition off. Disconnect A/C relay. Turn ignition on. Measure voltage between chassis ground and B+ 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.
20. 52) Check Circuit Resistance Turn ignition off. Leave A/C relay and A/C clutch disconnected. Measure resistance between power terminal of A/C relay and A/C clutch harness connectors. Measure resistance between ground terminal of A/C relay and A/C clutch harness connectors. If each resistance measurement is less than 5 ohms, replace A/C relay. If either resistance measurement is 5 ohms or more, repair open circuit. (Scheme 78): Identifying A/C Relay Connector Terminals NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 60). No test procedures have been omitted.
21. 60) KOEO/KOER DTC P1460; Check Voltage To A/C Relay Turn ignition off. Disconnect A/C relay. Turn ignition on. 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, repair open in IGN RUN circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000).
22. 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-24082-S37578241852001010400000).
23. 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-24082-S37578241852001010400000).
24. 63) Check ACON Circuit Continuity Leave ignition off and A/C relay disconnected. Measure resistance between test pin No. 69 at breakout box 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-24082-S37578241852001010400000).
25. 64) Check A/C Relay Leave ignition off. Reconnect A/C relay. Turn ignition on. While observing A/C clutch, connect and remove jumper wire between ground and breakout box test pin No. 69 (ACON). If A/C clutch does not engage and disengage when jumper wire is connected and removed, replace A/C relay. If A/C clutch engages and disengages when jumper wire is connected and removed, remove jumper wire and breakout box. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-24082-S37578241852001010400000). If DTC P1460 is still present, replace PCM. 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.
26. 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).
27. 71) Check Low Pressure (LP) Switch Turn ignition off. Disconnect LP switch. Measure resistance between chassis ground and both terminals of LP switch. If each resistance measurement is 10,000 ohms or more, check for faulty A/C demand switch. See A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT section. 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.
28. 72) Check ACD Circuit To PCM For Short To Ground 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. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 72) to step 75). No test procedures have been omitted.
29. 75) Check Power To A/C Clutch Circuit For Short To Power Ensure that A/C relay and A/C clutch are disconnected. Turn ignition on. Measure voltage between negative battery terminal and power side of A/C clutch harness connector. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair circuit short to power and verify symptom is corrected.
30. 76) Check A/C Relay Turn ignition off. Measure resistance between POWER-TO-CLUTCH terminal and IGN RUN terminal at A/C relay. Measure resistance between POWER-TO-CLUTCH terminal and B+ terminal at A/C relay. If either resistance measurement is less than 10,000 ohms, replace A/C relay and verify symptom is corrected. If both resistance measurements are more than 10,000 ohms, no faults are present. Testing is complete. (Scheme 79): Identifying A/C Relay Terminals 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.
31. 80) Check WOT A/C Cutoff Relay Turn ignition off. Disconnect WOT A/C cutoff relay. Measure resistance between relay terminals No. 3 and 4. If resistance is 5 ohms or more, replace WOT A/C cutoff relay. If resistance is less than 5 ohms, go to next step.
32. 81) 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 relay. If voltage is less than 10.5 volts, check fuse. If fuse is okay, repair open or short in IGN RUN circuit. If voltage is 10.5 volts or more, go to next step.
33. 82) Check Ground To A/C Clutch Relay Turn ignition off. Measure resistance between negative battery terminal and GROUND terminal of relay. If resistance is more than 5 ohms, repair open in ground circuit. If resistance is 5 ohms or less, go to next step.
34. 83) Check A/C Demand Circuit Turn ignition off. Measure resistance of A/C demand circuit between A/C clutch relay connector and WOTA/C cutoff relay connector. If resistance is more than 5 ohms, repair open in circuit. If resistance is 5 ohms or less, go to next step.
35. 84) Check A/C Clutch Circuit Turn ignition off. Disconnect A/C clutch harness connector Measure resistance of A/C demand circuit between A/C clutch relay connector and WOT A/C cutoff relay connector. If resistance is more than 5 ohms, repair open in circuit. If resistance is 5 ohms or less, replace A/C clutch relay. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 84) to step 90). No test procedures have been omitted.
36. 90) Check ACCS PID Turn ignition off. Disconnect A/C clutch relay and A/C Pressure Switch (ACPSW). 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.
37. 91) Check A/C Demand Circuit With ignition on, measure voltage between negative battery terminal and A/C demand circuit at WOT A/C cutoff relay harness connector. If voltage is more than 1.0 volt, repair circuit short to power. If resistance is 5 ohms or less, replace A/C clutch relay.
38. 92) Turn ignition off. Disconnect WOT A/C cutoff relay. Using scan tester, access ACCS PID. If ACCS PID is off, replace WOT A/C cutoff relay and verify symptom is corrected. If ACCS PID is on, go to next step.
39. 93) 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 1.0 volt, repair circuit short to power and verify symptom is corrected. If voltage is 1.0 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. 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. 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

Scheme 80

1. Wiring harness circuit (MIL).
2. Faulty Powertrain Control Module (PCM). (Scheme 80): MIL Circuit Schematic

1. 1) MIL Always On Perform «KOEO SELF-TEST»(ref-24082-S17000748712001010400000) . 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. 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. 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. 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. 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).

Continuous Memory DTC P0320

This code indicates that (2) successive erratic Profile Ignition Pulses (PIP) have occurred. Possible causes are as follows

1. Loose wires and/or connectors.
2. Short circuit to ground in ignition secondary system.
3. 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 fault is intermittent, go to step 50) of CIRCUIT TEST Z . If vehicle will start and none of the specified causes were present, replace PCM and repeat QUICK TEST .

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

TEST A: HISS WHEN OPENING FUEL CAP/FUEL TANK PRESSURE ABNORMAL

1. 1) Canister Hose & Inlet Nipple Blockage Check Inspect canister emission hoses and inlet nipple for blockage. If evaporative emission hoses or inlet are blocked, remove blockage or replace component as necessary. Restore vehicle and retest system. If evaporative emission hoses or inlet are not blocked, go to next step.
2. 2) Flow Test (Fuel Tank Filler Cap Removed) Remove fuel tank filler cap from fuel tank filler pipe. Install Rotunda Vacuum Tester (014-R1054) or equivalent to tee or evaporative emission nipple at Test Point B2. (Scheme 81) Using a hand pump, pressurize to a maximum of 2.5 psi (17.2 kPa). If pressure drops immediately to zero, go to step 5). If pressure does not drop immediately to zero, go to next step.
3. 3) Inspect Evaporative Emission Hose Inspect evaporative emission hose routing between fuel tank and body for pinch. If EVAP emission hoses are pinched, loosen fuel tank and reroute EVAP emission hose. Verify service. If EVAP emission hoses are not pinched, go to next step.
4. 4) Inspect Evaporative Emission Valve Remove fuel tank. Remove EVAP emission valve. Inspect EVAP emission valve for open air passage through orifice. If passage is open, reinstall EVAP emission valve in fuel tank. Install fuel tank. EVAP system test is complete. If passage is not open, replace EVAP emission valve. Verify service.
5. 5) Inspect Evaporative Emission Tube Inspect EVAP emission tube and EVAP emission hoses for kinks or pinched areas. If tube or EVAP emission hoses kinked or pinched, service or replace tube or evaporative emission hoses as necessary. Verify service. If tube or EVAP emission hoses are not kinked or pinched, go to next step.
6. 6) Flow Test (Fuel Cap Installed) Install Rotunda Vacuum Tester (014-R0154) or equivalent in fuel vapor hose at Test Point B1. (Scheme 81) Using a hand pump, pressurize to a maximum of 2.5 psi (17.2 kPa). If pressure drops immediately to zero, EVAP canister system flow is okay. If pressure does not drop to zero, replace EVAP emissions canister. Restore vehicle and retest system.
7. 7) Check Vacuum Hose Leak Between CANP Solenoid & Carbon Canister Check for cracks, splits and holes in vacuum hose between EVAP emission canister purge valve and carbon canister. If a problem is found, replace damaged vacuum hose (cracks, splits and holes). Restore vehicle and retest system. If no problem is found, go to next step.
8. 8) Check CANP Solenoid For Vacuum Leaks - Closed Vacuum Position Turn ignition switch off. Disconnect vacuum hose at both ends of EVAP emission canister purge valve. Install hand-held vacuum pump to intake manifold vacuum side of EVAP emission canister purge valve. Disconnect EVAP emission canister purge valve electrically. Apply 16 In. Hg (53 kpa) of vacuum to EVAP emission canister purge valve. If EVAP emission canister purge valve holds vacuum for 20 seconds, go to next step. If EVAP emission canister purge valve does not hold vacuum for 20 seconds, remove vacuum pump. Replace EVAP emission canister purge valve. Restore vehicle. Retest system.
9. 9) Check For Manifold Vacuum To CANP Solenoid Turn ignition switch off. Disconnect vacuum hose from manifold vacuum side of EVAP emission canister purge valve. Start engine. Place thumb on open end of vacuum hose at EVAP emission canister purge valve. If vacuum is present at engine vacuum hose to CANP solenoid, EVAP Emission System is okay. Reconnect all components. Drive vehicle. If vacuum is not present at engine vacuum hose to CANP solenoid, check vacuum hose to engine from EVAP emission canister purge valve for proper routing, kinks, leaks or blockage. Repair as necessary.

Scheme 81