Engine Controls - Tests W/codes - Eec-V (3.8L): Diagnosis Ford Mustang IV

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 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 1)
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 1)
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).

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

Scheme 1

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 1)
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 1)
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 1)
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.

Trip 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. Parameter Identification (PID) display on NGS tester, indicates status of monitors for a TRIP SET as either Yes or No. A trip must be completed before entry conditions necessary for the monitoring of Catalyst Efficiency Monitor test are enabled.

Trips & Diagnostic Trouble Codes

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

DTCs are stored in memory after any monitored system detects a malfunction over 2 consecutive drive cycles, except for misfire monitor DTCs, which can be set immediately after malfunction is detected. DTC is erased from memory after 40 engine warm-up cycles when identical malfunction is not detected. DTC memory storage requirements vary with each system monitor.

CIRCUIT TEST A - NO START VEHICLE WILL NOT START

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

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

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

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

Ignition System Test Circuits. Scheme 2

1) Starting System Check Ensure fuel pump inertia switch is closed (button pushed in). Try to start engine. If engine does not crank, check vehicle starting and charging systems. If engine cranks, go to next step.

2) Attempt to start engine. If engine now starts, go to CIRCUIT TEST Z, step 50). If engine does not start, go to next step.

3) Check For Malfunction Indicator Light (MIL) During Cranking Turn ignition off. Turn ignition on and observe MIL. If MIL is off, go to CIRCUIT TEST NB, step 1). If MIL is on, turn ignition switch to the START position. If MIL goes off, PIP circuit is okay; go to next step. If MIL stays on while engine is cranking, go to step 8).

4) Check Fuel Pressure Turn ignition off. Install fuel pressure gauge. While observing gauge, turn ignition on; wait one second and turn ignition off for 10 seconds. Repeat procedure 5 times. If fuel pressure increases, go to next step. If fuel pressure does not increase, CIRCUIT TEST X, step 150).

5) Check Idle Air Control Attempt to start engine at part throttle. If engine will not start and run smoothly, go to next step. If engine will start and run smoothly, go to CIRCUIT TEST KE, step 2).

6) 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 ohms, go to step 7). If resistance not 4-6 ohms, go to CIRCUIT TEST C.

Identifying TP Sensor Harness Connector Terminals. Scheme 3

7) 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.

8) 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 and MIL turned off on step 3), EEC-V system is okay and testing is complete. If spark is okay and MIL stayed on in step 3), go to next step. If spark is not okay and MIL turned off on step 3), check spark plugs and wires. Repair or replace as necessary. If spark is not okay and MIL stayed on in step 3), go CIRCUIT TEST JA, step 1).

9) Check Continuity Of Ignition Ground Circuit Ensure ignition is turned off. Disconnect PCM 104-pin connector and inspect for damage. Repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Install EI Diagnostic Harness (007-00059) leaving ICM disconnected. Install ICM overlay. Measure resistance between test pin No. 23 at breakout box and IGN GND terminal at the EI Diagnostic Harness. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

10) Check Continuity Of PIP Circuit Ensure ignition is off and PCM is disconnected. Measure resistance between test pin No. 49 at breakout and PIP circuit at EI Diagnostic Harness. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

11) Check PIP Circuit For Short To Power Turn ignition on. Leave PCM and ICM disconnected. Measure voltage between test pin No. 49 and negative battery terminal. If voltage is less than one volt, go to next step. If voltage one volt or more, repair short to power and repeat QUICK TEST.

12) Check PIP Circuit For Short To Ground Ensure ignition is off. Measure resistance between breakout box test pin No. 49 and test pins No. 23, 51, 91 and 103. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit and repeat QUICK TEST. If vehicle will not start, go to next step.

13) Check PIP Signal Ensure ignition is off. Reconnect ICM wiring harness connector. While cranking engine, measure voltage between test pins No. 23 and 49 at breakout box. If voltage is 3-7 volts, replace PCM and repeat QUICK TEST. If voltage is not 3-7 volts, replace PCM and repeat QUICK TEST.

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 4

If VREF voltage is more than 6 volts, go to step 24). If voltage is less than 6 volts, go to step 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) 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 16).

3) Check Scan Tool Ability To Access Parameter Identification 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 10). If scan tool is unable to access ECT PID, go to next step.

4) Check VPWR To Idle Air Control (IAC) Solenoid Turn ignition off. Disconnect TP sensor wiring harness connector. Disconnect IAC solenoid. Turn ignition on. Measure voltage between VPWR terminal (Red wire) at IAC wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, reconnect wiring harness connector and go to CIRCUIT TEST X.

Identifying IAC Wiring Harness Connector Terminals. Scheme 5

5) Check For Shorted DPFE Or TP Sensor Disconnect DPFE and TP wiring harness connector. Measure voltage between TP sensor wiring harness connector SIG RTN terminal and VREF terminal. If voltage measurement is 4-6 volts, replace DPFE sensor and repeat QUICK TEST. If voltage measurement is not 4-6 volts, go to step 7).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 7). No test procedures have been omitted.

7) 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. If voltage measurement is not 4-6 volts, go to next step.

8) Check VPWR To PCM Turn ignition off. Leave ACP, DPFE, TP sensor and TP-B 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.

9) Check VREF Circuit For Short To Ground Or SIG RTN Turn ignition off. Leave PCM, DPFE, TP sensor and TP-B 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. If resistance is 10,000 ohms or more, replace PCM and repeat QUICK TEST.

10) Check VREF Continuity To PCM Turn ignition off. Leave PCM, DPFE and TP sensor disconnected. Measure resistance between test pin No. 90 (VREF) and VREF terminal at TP sensor wiring harness connector. see scheme 22 If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in VREF circuit between TP/DPFE sensor splice and PCM.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 16). No test procedures have been omitted.

16) 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 19).

17) 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) Check SIG RTN Circuit Continuity PCM Turn ignition off. Leave scan tester disconnected. Disconnect sensor where VREF circuit failed. 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, go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat QUICK TEST.

19) Check PCM PWR GND Circuits Turn ignition off. Leave scan tester disconnected. Measure resistance between negative battery terminal and test pins No. 51, 76, 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.

20) 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, 76, 77 and 103 (PWR GND). If each resistance is less than 5 ohms, PWR GND and SIG RTN are okay. Repeat step 18) to verify results. If any resistance is 5 ohms or more, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 24). No test procedures have been omitted.

24) Check VREF Circuit For Short To Power Turn ignition off. Leave DPFE, TP and suspect sensor disconnected. Disconnect PCM. Turn ignition on. Measure voltage between VREF terminal at TP sensor wiring harness connector and negative battery terminal. If voltage is less than 0.5 volt, replace PCM and repeat QUICK TEST. If voltage is 0.5 volt or more, repair VREF circuit for a short to power and repeat QUICK TEST.

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

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

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

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

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

Temperature Sensor Circuits & Connector Terminals. Scheme 6

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

1. Low coolant level.
2. Faulty harness connector.
3. 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. If KOEO DTC P1116 is present, go to next step. If Continuous Memory DTC P1116 is present, go to step 100). If DTC P1116 is not present, service other codes as necessary.

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 6) 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.

Identifying TP Sensor Harness Connector Terminals. Scheme 7

3) Check Temperature Sensor Resistance 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 table. If resistance is not within specification, replace suspected sensor and repeat QUICK TEST. If resistance is within specification, perform following step as applicable.

1. For diagnosing vehicles with ECT sensor and a no-start condition, DO NOT service DTC 116 at this time. Repair no-start condition and repeat QUICK TEST.
2. For diagnosing vehicles without a no-start condition, go to next step.

4) Check Temperature Sensor Resistance (KOER) Warm engine to normal operating temperature. Turn ignition off. Disconnect suspect sensor. Start engine and operate at 2000 RPM for 2 minutes. Measure resistance between signal circuit (ECT or IAT) terminal and SIG RTN terminal at sensor wiring harness connector. See ACT & ECT SENSOR SPECIFICATIONS table. If resistance is within specification, replace PCM, and repeat QUICK TEST. If sensor is not within specification replace sensor, and repeat QUICK TEST.

ACT & ECT SENSOR SPECIFICATIONS

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.

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

1. Open circuit in wiring harness (IAT or ECT).
2. Faulty connection.
3. Faulty sensor.
4. Faulty PCM.

Turn ignition off. Disconnect suspect temperature sensor. Connect a jumper wire between signal circuit (ECT or IAT) terminal and SIG RTN terminal at sensor wiring harness connector. With scan tester installed, turn ignition on.

Note. If communication link error is displayed, remove jumper wire and go to step 12).

Access ECT or IAT PID. If the PID is less than 0.2 volt, replace sensor and repeat QUICK TEST. If PID is 0.2 volt or more, remove jumper wire and go to next step.

11) Check Continuity Of Sensor Signal & SIG RTN Circuits Turn ignition off. Ensure suspect temperature sensor is disconnected. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 38 (ECT sensor) or test pin No. 39 (IAT sensor) at breakout box and SIG RTN terminal at sensor wiring harness connector. Also, measure resistance between test pin No. 91 (SIG RTN) and SIG RTN circuit at sensor wiring harness connector. If both readings are less than 5 ohms, replace PCM, and repeat QUICK TEST. If either reading is 5 ohms or more, repair open circuit and repeat QUICK TEST.

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. If either resistance is less than 10,000 ohms, repair short circuit to VREF and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.

20) DTC P0117 or P0112 DTC 117 (ECT) or 112 (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

1. Circuit grounded in wiring harness.
2. Faulty sensor.
3. Faulty connection.
4. 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. Access ECT of IAT PID. If PID is less than 4.2 volts, go to next step. If PID is 4.2 volts or more, replace sensor and repeat QUICK TEST.

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.

22) Check Signal Circuit For Short To Ground Turn ignition off. Disconnect suspect sensor. Disconnect PCM 104-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 38 (ECT) or 39 (IAT) and test pins No. 24, 51 and 91. If any reading is less than 10,000 ohms, repair short circuit, and repeat QUICK TEST. If all readings are 10,000 ohms or more, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.

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

1. Faulty sensor.
2. Faulty sensor connector.
3. Open or grounded circuit in harness.
4. 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.

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. If no fault is found, go to step 92).

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. 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.

100) DTC P0125 & P0126 These DTCs indicate ECT sensor has not reached normal operating temperature. Possible causes for this fault are

1. Insufficient engine warm-up time.
2. Thermostat leaking or stuck open.
3. Low coolant.

Repair cooling system as necessary. Clear PCM memory, and repeat QUICK TEST.

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

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

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

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

Mass Airflow (MAF) Sensor Circuits & Connector Terminals. Scheme 8

Mass Airflow (MAF) Sensor Extension Circuits & Connector Terminals. Scheme 9

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.

1) DTC P1101: MAF Output Voltage DTC P1101, retrieved during KOEO self-test, indicates voltage exceeded .2-volt test range. DTC P1101, retrieved during KOER self-test, indicates voltage is not within .34-1.96 volts operating range. Possible causes for this fault are

1. Air leak before or after MAF sensor.
2. Faulty MAF sensor.
3. Faulty MAF sensor wiring harness connector.
4. Open PWR GND or MAF RTN circuit.
5. Faulty PCM.

Turn ignition off. 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 9).

2) 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

1. Faulty MAF sensor.
2. Faulty MAF sensor wiring harness 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.

3) 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. If voltage does not go out of normal range, fault cannot be duplicated or identified at this time. Testing is complete.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 6). No test procedures have been omitted.

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

1. Open or closed MAF circuit.
2. MAF circuit shorted to ground.
3. Faulty MAF sensor or connector.
4. Faulty TP system.

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).

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.

8) Check Continuity Of VPWR Circuit Turn ignition off. 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.

9) Check MAF Circuit For Short To Ground & MAF RTN Circuit Leave ignition off and MAF disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 88 (MAF SIG) and test pins No. 24, 36 (MAF RTN), 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.

10) Check Continuity Of MAF SIG Circuit Leave ignition off 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.

11) Check PWR GND Circuit To MAF Sensor Leave ignition off and MAF disconnected. 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 13).

12) Check PWR GND Circuit Continuity Leave ignition off and MAF sensor disconnected. 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.

13) Check MAF RTN Circuit Continuity Leave ignition off 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.

14) 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. 24, 36 (MAF RTN) 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.

15) 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.

16) 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, go to next step. If voltage is not 0.34-1.96 volts, replace MAF sensor and repeat QUICK TEST.

17) Check MAF Circuit Input & Output Turn ignition off. Leave PCM connected to breakout box. Start engine and allow to idle. Measure voltage between test pin No. 36 (MAF RTN) and No. 88 (MAF SIG) at breakout box. If voltage is 0.34-1.96 volts, replace PCM and repeat QUICK TEST. If voltage is not 0.34-1.96 volts replace MAF sensor and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 17) to step 20). No test procedures have been omitted.

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

1. Restricted MAF sensor screen.
2. MAF SIG circuit shorted to VPWR.
3. Faulty MAF sensor or connector.
4. 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.

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.

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. If resistance is 10,000 ohms or less, repair short in MAF SIG circuit and repeat QUICK TEST.

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

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

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

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

Identifying KS Sensor Test Circuits & Connector Terminals. Scheme 10

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

1. High altitude interference.
2. Open or short in harness.
3. Faulty knock sensor.
4. 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) Check For Intermittent Circuit Fault Leave voltmeter connected breakout box and 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.

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. If AC voltage does not increase, go to next step.

4) Check Circuit Continuity Turn ignition off. Disconnect PCM from breakout box. Disconnect suspect sensor. Measure resistance of KS circuit (KS1 or KS2) between suspect sensor connector terminal and breakout box. Measure resistance of SIG RTN circuit between suspect sensor connector terminal and breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

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. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

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. If any voltage measurement is 0.5 volt or more, repair circuit short to power and repeat QUICK TEST.

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

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

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

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

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

TP Sensor Schematic. Scheme 11

Identifying TP Sensor Circuit & Connector Terminals. Scheme 12

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

1. Faulty TP sensor.
2. Faulty Powertrain Control Module (PCM).

Perform KOEO and KOER self-test. Check for DTC P1400. If DTC P1400 is present, service code and repeat QUICK TEST. If DTC P1400 is not present with DTC P1124, go to step 2).

2) DTC P1120: Check For Binding Throttle Plate DTC P1120 indicates TP sensor is below closed throttle position range of 9.8 percent (.49 volt) Possible causes for this fault are

1. Binding or bent throttle linkage.
2. Throttle plate below closed throttle position.
3. Faulty TP sensor.
4. Faulty Powertrain Control Module (PCM).

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. If no mechanical problem is found, go to step 3).

3) Check For Stuck TP Sensor Turn ignition off. Connect scan tester to DLC. Access TP PID on scan tester. While observing TP PID, slowly move throttle through range from closed to wide open throttle. If TP PID indicates any sudden drops to below 0.49 volt, replace TP sensor and repeat QUICK TEST. If TP PID increase and decrease is gradual and smooth, go to next step.

4) Check TP Sensor Signal To 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. 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.

5) DTC P0123 This code indicates TP signal is more than self-test maximum. Possible causes for this fault are

1. TP sensor not seated correctly.
2. Faulty TP sensor.
3. TP circuit shorted to VREF or VPWR.
4. VREF circuit shorted to VPWR.
5. Open in SIG RTN circuit.
6. 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 7). If PID voltage is less than 0.17 volt, go to next step.

6) 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, replace TP sensor and repeat QUICK TEST. If voltage is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.

7) 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. If each resistance is 10,000 ohms or more, replace PCM and repeat QUICK TEST. 8) DTC P0122

This code indicates TP signal is less than self-test minimum of 0.17 volt. Possible causes for this fault are

1. TP sensor not seated correctly.
2. Faulty TP sensor.
3. Open TP or VREF circuit.
4. TP circuit shorted to SIG RTN or PWR GND.
5. 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. If PID voltage is 4.60 volts or less, go to next step. If scan tester is unable to access TP PID, go to step 11).

9) Check VREF Circuit Voltage With TP sensor disconnected, turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If reading is 4-6 volts, go to next step. If reading is not 4-6 volts, reconnect sensor and go to CIRCUIT TEST C.

10) Check TP Circuit Continuity Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and TP terminal of TP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TP circuit.

11) 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. If both resistances are 10,000 ohms or more, replace PCM and repeat QUICK TEST.

12) Continuous Memory Code P1121 This code indicates TP signal is inconsistent with MAF sensor signal. Possible causes for this fault are as follows

1. TP sensor not seated correctly.
2. Faulty TP sensor.
3. 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.

13) Check Operation Of TP Sensor Start engine and allow to idle. Access TP PID on scan tester. While observing TP PID, slowly move throttle through range from closed position to wide open throttle. If TP PID indicates any sudden drops to below 0.66 volt, or increases to more than 1.20 volts, replace TP sensor and repeat QUICK TEST. If TP PID increase and decrease is gradual and smooth, and within 0.66-1.20 volt range, go to next step.

14) 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.

15) Check TP Sensor Low With Engine Under Load Start engine and allow to idle. If engine does not start, go to CIRCUIT TEST A. Access TP PID and LOAD PID on scan tester. If TP PID is 0.24 volt or more and LOAD PID is less than 60 percent, go to next step. 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. If DTC P1121 is still present, replace MAF sensor.

16) 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 0.24 volt or less and LOAD PID is more than 60 percent, go to next step. If TP PID is more than 0.24 volt and LOAD PID is less than 60 percent, problem is intermittent and cannot be identified at this time. If vehicle will not start, go to CIRCUIT TEST A.

17) Continuous Memory Code P1125 This code indicates TP signal went below 0.49 volt or above 4.60 volts sometime during the last 80 drive cycles. Possible causes for this fault are

1. Faulty TP sensor wiring harness or connector.
2. 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. 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.

18) 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. If DVOM reading goes out of range, isolate fault and repair as necessary. Clear PCM memory and repeat QUICK TEST.

19) DTC PO121: Unable To Exit KOER Self-Test Start engine and allow to idle. Using scan tester, enter KOER self test. If DTC P121 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.

20) 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. Enter KOER self-test. If DTC P121 is present or KOER cannot be terminated, go to next step.

21) 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. If continuity is not present, repair open circuit and repeat QUICK TEST.

Delayed engagement of transmission may be caused by mechanical malfunction. Harsh shifts and/or erratic speedometer reading may be caused by a failed speedometer or an open or intermittent ground within the instrument panel (electronic instrument cluster). Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose

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

Identifying VSS Circuit & Connector Terminals. Scheme 13

1) DTC P0500 This code indicates PCM detected incorrect output from VSS sometime during vehicle operation. Possible causes for this code are

1. Faulty VSS.
2. Open or shorted circuit.
3. 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. 33 and VSS(-) terminal at VSS wiring harness connector. Measure resistance between test pin No. 58 and VSS(+) terminal at VSS wiring harness connector. If both 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 20).

2) Check VSS Circuits For Shorts To Power Or Ground Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance between test pin No. 33 and test pin No. 71. Measure resistance between test pin No. 58 and test pins No. 51, 103 (PWR GND), 33, 71 (VPWR), and 91 (SIG RTN) at breakout box. If all readings are more than 500 ohms, go to next step. If any reading is less than 500 ohms, repair shorts in VSS wiring harness. Clear PCM memory and go to step 20).

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 20). If resistance is 190-250 ohms, replace PCM and go to step 20).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 10). No test procedures have been omitted.

10) DTC P1500 This code indicates PCM detected intermittent input from VSS. Possible causes for this code are

1. Intermittent open or shorted circuit.
2. Faulty VSS.
3. Faulty PCM.

Turn ignition off. Disconnect VSS sensor. Visually inspect VSS and VSS circuits for potential faults as follows

1. Loose VSS circuit connectors.
2. Loose VSS circuit connector pins.
3. Damaged VSS wiring harness insulation.
4. Incorrect VSS circuit routing.
5. Incorrect VSS installation.

If no faults are found, go to CIRCUIT TEST Z. If faults are found, repair or replace as necessary. Clear PCM memory and go to step 20).

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.

20) VSS Drive Cycle Record and clear continuous memory codes. Warm engine to normal operating temperature. Perform appropriate drive cycle as follows

1. 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. Service codes as necessary. If no codes are present, testing is complete.
2. 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. Service codes as necessary. If no codes are present, testing is complete.

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

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

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

CID Wiring Harness Circuits. Scheme 14

1) DTC P0340 This code indicates error has been detected in CMP sensor circuit. Possible causes for this fault are

1. CID circuit open or shorted wiring harness.
2. PWR GND or VPWR circuit open.
3. Faulty CMP sensor.
4. Faulty ICM.
5. Faulty PCM.

If engine starts, go to step 2). If engine does not start, go to PINPOINT TEST A: NO START in the appropriate SYSTEM/COMPONENT TESTS - EEC-V (3.8L) article.

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. If DTC P0340 is not present, go to CIRCUIT TEST Z. If DTC P0340 is present, go to step 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.

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.

5) Check Continuity Of CID Circuits Leave ignition off. Disconnect PCM 104-pin connector. Inspect for damaged terminals and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 85 (CID) at breakout box and CID terminal at CMP sensor wiring harness connector. If each resistance 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.

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.

7) Check CID Circuit For Short To Ground Turn ignition off. Leave CMP sensor disconnected. Measure resistance between test pin No. 85 and test pins No. 51, 103 and 91 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.

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. If any resistance measurement is less than 500 ohms, replace PCM and repeat QUICK TEST.

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. If voltage does not vary more than 0.1 volt, replace CMP sensor and repeat QUICK TEST.

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

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

Identifying ACP Sensor Test Circuit & Connector Terminals. Scheme 15

1) DTC P1461 This code indicates PCM has detected high voltage in ACP circuit. Possible causes for this code are

1. Faulty ACP sensor.
2. Open or shorted circuit.
3. Faulty Powertrain Control Module (PCM).

Turn ignition off. Connect scan tester to DLC. Turn ignition on. Access ACP PID. If ACP PID voltage is more than 4.9 volts, go to next step. If ACP PID voltage is 4.9 volts or less, fault is intermittent and cannot be duplicated at this time and testing is complete.

2) Check VREF & SIG RTN Circuit Turn ignition off. Disconnect ACP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF connector terminals. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range or SIG RTN is open. Go to CIRCUIT TEST C.

3) Leave ignition on and ACP sensor disconnected. If voltage between SIG RTN and VREF connector terminals is less than one volt, replace ACP sensor and repeat QUICK TEST. If voltage between SIG RTN and VREF connector terminals is one volt or more, go to next step.

4) Check ACP Circuit For Short To VREF Turn ignition off. Leave ACP sensor disconnected. Disconnect scan tester from DLC. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Measure resistance between ACP terminal and VREF terminal at ACP connector. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair ACP circuit short to VREF and repeat QUICK TEST.

5) Check ACP Circuit For Short To Power Leave ACP sensor and PCM disconnected. Measure voltage between ACP terminal at ACP connector and chassis ground. If voltage is less than one volt, replace PCM and repeat QUICK TEST. If voltage is one volt or more, repair ACP circuit short to power and repeat QUICK TEST.

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.

10) DTC P1462 This code indicates PCM has detected low voltage in ACP circuit. Possible causes for this code are

1. Faulty ACP sensor.
2. Open or shorted circuit.
3. Faulty Powertrain Control Module (PCM).

Turn ignition off. Connect scan tester to DLC. Turn ignition on. Access ACP PID. If ACP PID voltage is less than .15 volt, go to next step. If ACP PID voltage is .15 volt or more, replace PCM and repeat QUICK TEST.

11) Check VREF Circuit At ACP Sensor Turn ignition off. Disconnect ACP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF connector terminals. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range or SIG RTN is open. Go to CIRCUIT TEST C.

12) Turn ignition off. Leave ACP sensor disconnected. Connect scan tester to DLC. Connect jumper wire between ACP terminal and VREF terminal at sensor connector. Turn ignition on. Access ACP PID (if scan tester cannot access ACP PID, go to next step). If ACP PID voltage is less than 4 volts, go to next step. If ACP PID voltage is 4 volts or more, replace ACP sensor and repeat QUICK TEST.

13) Check ACP Circuit For Short To Ground Or SIG RTN Leave ignition off and ACP sensor disconnected. Disconnect scan tester from DLC. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Measure resistance between ACP terminal and SIG RTN terminal at ACP connector. Measure resistance between ACP terminal at ACP connector and negative battery terminal. If both resistance measurements are 10,000 ohms or more, go to next step. If either resistance measurements are less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

14) Check ACP Circuit Continuity Leave ignition off. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 86 (ACP) at breakout box and ACP terminal at ACP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ACP circuit and repeat QUICK TEST.

15) Check A/C Clutch Engagement Turn ignition on. Reconnect ACP sensor. Turn ignition on while listening for A/C clutch engagement. If A/C clutch engages when ignition is turned on, replace PCM and repeat QUICK TEST. If A/C clutch engages when ignition is turned on, ensure system has correct refrigerant charge. Service A/C system if necessary. If A/C system has correct refrigerant charge, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 18). No test procedures have been omitted.

18) Check Wiring Harness & Sensor With scan tester connected, turn ignition on. Access ACP PID. While observing ACP PID, lightly tap on ACP sensor to simulate road shock. Wiggle sensor connector and wiring harness. A fault is indicated by a sudden change of voltage. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 20). No test procedures have been omitted.

20) DTC P1463 This code indicates PCM has detected that ACP sensor did not detect sufficient change in A/C system pressure when A/C switch was turned on. Possible causes for this code are as follows

1. A/C system mechanical malfunction.
2. A/C system electrical malfunction (non-EEC related).
3. A/C clutch continuous engagement.
4. Faulty ACP sensor.

Turn A/C and defroster off. Start engine and allow to idle. Attempt to disengage A/C clutch. If A/C clutch disengages, go to next step. If A/C clutch does not disengage, repair or replace A/C compressor.

21) Check Power & Ground To A/C Clutch Turn ignition off. Disconnect A/C cycling switch. Connect jumper wire between A/C cycling switch connector terminals. Disconnect A/C clutch. Connect voltmeter to A/C clutch connector terminals. Start engine and allow to idle. Turn A/C switch on. Monitor voltage for 15 seconds. Turn ignition off. If voltage is less than 10.5 volts, go to CIRCUIT TEST X, step 110). If voltage is 10.5 volts or more, replace ACP sensor and repeat QUICK TEST. If DTC 1463 is still present, fault is mechanical and EEC testing is complete.

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

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

BOO Switch Circuit. Scheme 16

1) DTC P0703: 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

1. Brake pedal not applied during self-test.
2. Brake pedal applied during entire self-test.
3. Open brakelight circuit.
4. Short to ground or power.
5. Faulty brakelight switch.
6. 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) DTC P1703 This code indicates that voltage was present at BOO circuit during KOEO SELF-TEST. Possible causes for this fault are as follows

1. Brake pedal applied during KOEO self-test.
2. BOO circuit short to or power.
3. Faulty brakelight switch.
4. Faulty Powertrain Control Module (PCM).

If brake was applied during KOEO SELF-TEST, repeat test. If pedal was not depressed, go to next step.

3) Check Operation Of Brakelights With ignition on, check operation of brakelights. If brakelights operate normally, go to next step. If brakelights do not operate, go to step 5). If brakelights are always on,go to step 7).

4) Check For BOO Switch Circuit 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. Measure voltage between test pin No. 92 (BOO) and test pins No. 76 and 77 while applying and releasing brake. If voltage cycles, replace PCM and repeat QUICK TEST. If voltage does not cycle, repair open circuit in BOO switch circuit between PCM and BOO switch connection to brakelight circuit. Repeat QUICK TEST.

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.

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. If resistance is less than 5 ohms, repair open circuit between switch and stoplight ground and repeat QUICK TEST.

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.

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.

9) Check For Short To Power In Shift Lock Actuator Turn ignition off. Ensure PCM and brakelight switch are disconnected. Disconnect shift lock actuator, cruise control module and ABS module (if equipped). Turn ignition on. If brakelights are still on, repair short to power in BOO circuit and repeat QUICK TEST. 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.

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

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

Identifying PSP Test Circuit & Connector Terminals. Scheme 17

1) DTC P1650 Or P1651 DTC P1650 indicates PSP signal is out of self-test range. DTCP1651 indicates PSP signal malfunction. Possible causes for this fault are as follows

1. Open or short in wiring harness.
2. Faulty PSP switch.
3. 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 next step. If scan tester indicates on/off switching, go to CIRCUIT TEST Z.

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. If engine speed does not increase when switch is disconnected, go to next step.

3) Check PSP Circuit Continuity Turn ignition off. Leave PSP switch disconnected. Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of PSP switch connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

4) 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, replace PCM and repeat QUICK TEST. If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

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

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

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

Octane Adjust Components. Scheme 18

Octane Adjust Circuit. Scheme 19

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) 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 the appropriate TESTS W/O CODES - EEC-V (3.8L) article. If vehicle does not have modification decal, go to next step.

3) Check For DTC P1390 Replace OCT ADJ shorting bar. Perform KOEO SELF-TEST. 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 the TESTS W/O CODES - EEC-V (3.8L) article.

4) Check Octane Adjust Circuit Continuity Continuity should exist from OCT ADJ circuit, through in-line connector and shorting bar, to SIG RTN circuit. Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 30 (OCT ADJ) and 91 (SIG RTN) at breakout box. If resistance is less than 5 ohms, replace PCM and repeat QUICK TEST. If resistance is 5 ohms or more, repair open OCT ADJ circuit, shorting bar or SIG RTN circuit. Repeat QUICK TEST.

5) Check For DTC P1390 Start engine. Warm it to normal operating temperature. Turn ignition off. Perform KOEO SELF-TEST. If DTC P1390 is not present, go to next step. If DTC P1390 is present, return to step 1).

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) 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 the TESTS W/O CODES - EEC-V (3.8L) article.

8) Check For Technical Service Bulletin (TSB) If a TSB authorizing removal of OCT ADJ shorting bar exists, go to next step. If a TSB authorizing removal of OCT ADJ shorting bar does not exist, testing is complete. If engine is detonating, go to the TESTS W/O CODES - EEC-V (3.8L) article.

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) 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 still detonating, go to TESTS W/O CODES - EEC-V (3.8L) article.

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 the TESTS W/O CODES - EEC-V (3.8L) article.

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

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

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

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

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

CIRCUIT TEST ACRONYMS

Identifying HO2S Connector Terminals. Scheme 20

Identifying Fuel Injector Connector Terminals. Scheme 21

Note. Test procedure begins with step 10). No test procedures have been omitted.

10) DTC P0132, P0138, P0152 & P0158 These codes indicate that an overvoltage (more than 1.5 volts) has occurred in HO2S as follows

1. DTC P0132 for right front HO2S.
2. DTC P0138 for left front HO2S.
3. DTC P0152 for right rear HO2S.
4. DTC P0158 for left rear HO2S.

Possible causes are as follows

1. Signal shorted in wiring harness.
2. Faulty HO2S.
3. Faulty PCM.

With scan tester connected, turn ignition on. Access PID for fault code generated. If PID voltage is 1-4 volts, go to next step. If voltage is not 1-4 volts, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z.

11) Check For Short In HO2S Wiring Harness Turn ignition off. Disconnect suspect sensor. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect sensor and test pins indicated as follows

1. DTC P0132, test pin No. 60 and test pins No. 71, 93 and 97.
2. DTC P0138, test pin No. 35 and test pins No. 71, 95 and 97.
3. DTC P0152, test pin No. 87 and test pins No. 71, 94 and 97.
4. DTC P0158, test pin No. 61 and test pins No. 71, 96 and 97.

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.

12) Check Sensor For Internal Short Turn ignition off. Disconnect suspect sensor. Connect scan tester to DLC. Turn ignition on. Access HO2S PID. If PID voltage is less than 0.2 volt, replace HO2S and repeat QUICK TEST. If PID voltage is 0.2 volt or more, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.

20) DTC P0133 & P0153 This code indicates that response rate is below calibration in HO2S as follows

1. DTC P0133 for right front HO2S.
2. DTC P0153 for left front HO2S.

Possible causes are as follows

1. Open or shorted circuit.
2. Exhaust leak.
3. Excessive fueling.
4. HO2S coated with contaminants.
5. Faulty MAF sensor.
6. Leak in air induction system.

With scan tester connected, turn ignition on. Access Generic OBD-II functions and enter. Scroll to Oxygen Sensor Test and enter. Scroll to Manufacturer Specific Test ID and enter. Scroll to Test ID: (41H) and enter. If measurement fault is 0.6 volt or more, fault cannot be duplicated or identified at this time and testing is complete. If measurement fault is less than 0.6 volt, go to next step.

21) Check For HO2S Contamination Check following possibilities as potential source of contamination

1. Use of unapproved silicon sealers.
2. Use of unapproved cleaners.
3. Fuel contaminated by silicon additives.
4. Fuel contaminated by lead.
5. Excessive oil burning.
6. Antifreeze leaking internally.

If any of these conditions are present, repair or replace as necessary. If none of these conditions are present, go to next step.

22) 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

1. Leaking vacuum hoses.
2. Leaking intake manifold gasket.
3. EGR system.
4. PCV system.
5. Poorly seated oil dip stick and/or dipstick tube.

If any of these conditions are present, repair or replace as necessary. If none of these conditions are present, go to next step.

23) 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 SIG RTN 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.

24) 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. If each resistance is less than 5 ohms, go to next step.

25) Check HO2S For Short Circuit Ensure ignition is off and PCM is disconnected. 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. If each resistance is 10,000 ohms or more, replace PCM.

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.

27) DTC P0131 & P0151 These DTCs are set when HO2S generates negative voltage. Possible causes are as follows

1. Open or shorted circuit.
2. HO2S contaminated with water, fuel, etc.

Check HO2S connector and repair if necessary. If connector is okay, go to next step.

28) Check HO2S For Short Circuit Ensure ignition is 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 sensor HO2S SIGNAL and SIG RTN terminal and test pins indicated as follows

1. DTC P0131, test pin No. 60.
2. DTC P0151, test pin No. 87.

If resistance is less than 5 ohms, replace HO2S and repeat QUICK TEST. If resistance is 5 ohms or more, repair circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 28) to step 30). No test procedures have been omitted.

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 separate codes

1. DTC P0135 for right front HO2S.
2. DTC P0155 for left front HO2S.
3. DTC P0141 for right rear HO2S.
4. DTC P0161 for left rear HO2S.

Possible causes are as follows

1. Signal shorted in wiring harness or HO2S.
2. Water in connectors.
3. Cut or pulled wires.
4. 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.

31) 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 more, go to next step. If voltage is less than 10.5 volts, repair VPWR circuit and repeat QUICK TEST.

32) 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, replace HO2S sensor and repeat QUICK TEST.

33) 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.

34) Leave ignition off and 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 and repeat QUICK TEST.

35) Leave ignition off and suspect sensor disconnected. Measure resistance between HO2S HEATER GND terminal at HO2S wiring harness connector HO2S case. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace HO2S sensor and repeat QUICK TEST.

36) Check For Short Circuit Leave ignition off and sensor disconnected. 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

1. DTC P0135 (RF), test pin No. 93 and test pins No. 24, 76, 91 and 103.
2. DTC P0141 (RR), test pin No. 95 and test pins No. 24, 76, 91 and 103.
3. DTC P0155 (LR), test pin No. 94 and test pins No. 24, 76, 91 and 103.
4. DTC P0161 (LR), test pin No. 96 and test pins No. 24, 76, 91 and 103.

If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short in circuit and repeat QUICK TEST.

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

1. Left front HO2S sensor; test pin No. 94.
2. Right front HO2S sensor; test pin No. 93.
3. Left rear HO2S sensor; test pin No. 96.
4. Right rear HO2S sensor; test pin No. 95.

If resistance is 4 ohms or more, repair open circuit in wiring harness and repeat QUICK TEST. If resistance is less than 4 ohms, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 37) to step 40). No test procedures have been omitted.

40) DTC P1130, P1150, P1131, P1151, P1132, P1152, P0171, P0172, P0174 Or P0175: HO2S Not Switching DTCs P1131, P1151, P1132 P1152 indicate indicate upstream HO2S not switching.

DTCs P1130 and P1150 indicate system is not switching at the adaptive limits.

DTCs P0171, P0172, P0174 and P0175 indicate system is continuously at the adaptive limits.

Possible causes are as follows

1. Engine oil level too high.
2. Excessive internal engine wear.
3. Fault in secondary ignition.

Inspect engine for obvious defects. Repair or replace as necessary. If no faults are found, go to next step.

41) Perform KOER Self-Test Start engine, and warm it to normal operating temperature. With scan tester connected, perform KOER self-test. If any of the codes in step 40) are present, go to step 42). If none of the codes in step 40) are present, fault is intermittent. Go to CIRCUIT TEST Z.

42) 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 allow to idle or cycle key on and off if vehicle will not start. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, repair as necessary. See FUEL SYSTEM in the SYSTEM/COMPONENT TESTS - EEC-V (3.8L) article.

43) 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 remains within 5 psi of highest fuel pressure reading for 60 seconds, go to step 45) for DTCs P1130, P01150, P0171, P0172, P0174 and P0175 or go to step 50) for all others. If fuel pressure does not remain at specification for 60 seconds, repair fuel system as necessary. See FUEL SYSTEM in the SYSTEM/COMPONENT TESTS - EEC-V (3.8L) article.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 43) to step 45). No test procedures have been omitted.

45) 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 of original pressure, go to next step. If fuel pressure drops more than 5 psi, repair fuel system as necessary. See FUEL SYSTEM in the SYSTEM/COMPONENT TESTS - EEC-V (3.8L) article.

46) 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 table. Resistance should be 11-18 ohms. If resistance is correct but vehicle will not start, go to step 49). If resistance is correct, go to next step.

FUEL INJECTOR INJ CIRCUIT IDENTIFICATION

47) Check Continuity Of Fuel Injector Circuit Turn ignition off. Disconnect suspect fuel injector wiring harness connector. Measure resistance between test pins No. 71 and 97 at breakout box and fuel injector VPWR terminal at wiring harness connector. (Scheme 21) Measure resistance between fuel injector signal test pin(s) at breakout box and same fuel injector circuit terminal at each fuel injector wiring harness connector. If each resistance is less than 5 ohms, go to next step. If each resistance is 5 ohms or more, repair open circuit. Reconnect all components and drive vehicle for 5 miles at 55 MPH. Repeat QUICK TEST.

48) Check Fuel Injector Circuit For Short To Power Or Ground Turn ignition off. Disconnect suspect fuel injector wiring harness connector. Measure resistance between fuel injector test pin and test pins No. 24, 71, 76, 97 and 103 at breakout box. Also, measure resistance between fuel injector test pin(s) at breakout box and chassis ground. If each resistance is 10,000 ohms or more, go to next step. If each resistance is less than 10,000 ohms, repair short. Remove breakout box, reconnect all components and drive vehicle for 5 miles at 55 MPH. Repeat QUICK TEST.

49) 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. Reconnect all components, and drive vehicle for 5 miles at 55 MPH. Repeat QUICK TEST.

50) 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, clean fuel injectors, and repeat QUICK TEST. If flow rate for each fuel injector is okay, go to CIRCUIT TEST Z (DTCs P1171, P1172, P1174 and P1175) or next step for all others.

51) Using compression gauge, check cylinder compression. If compression is okay, go to next step (DTCs P1130, P1150, P1131 and P1151) or step 57) (DTCs P1132 and P1152). If cylinder compression is not okay, repair engine as necessary. Clear PCM memory and repeat QUICK TEST.

52) 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

1. Moisture inside HO2S causing short to ground.
2. HO2S coated with contaminates.
3. HO2S circuit open or shorted to ground.

Turn ignition off. Inspect HO2S and circuit for damage or contamination. Repair or replace HO2S or wiring as necessary. Start engine and operate at 2000 RPM for 2 minutes. Turn ignition off. Connect scan tool to DLC and perform KOER self-test. If trouble codes are present, go to next step. If no trouble codes are present, faults cannot be duplicated or identified at this time. Testing is complete.

53) Check HO2S Ability To Generate Correct Voltage Warm engine to normal operating temperature. Operate engine at 2000 RPM for 2 minutes. Perform KOER self-test while monitoring HO2S voltage. If voltage is 0.5 volt or more at the end of test, go to next step. If voltage is less than 0.5 volt, replace HO2S sensor and repeat QUICK TEST.

54) Check Continuity Of HO2S Ground Circuits Turn ignition off. Install breakout box, leaving PCM disconnected. Disconnect suspect HO2S wiring harness connector. Inspect connector for damage and repair as necessary. Measure resistance between HO2S test pin at breakout box and HO2S terminal at sensor wiring harness connector. Also, measure resistance between test pin No. 91 and SIG RTN terminal at HO2S sensor vehicle wiring harness connector. If each resistance is less than 5 ohms, go to next step. If any resistance is 5 ohms or more, repair open circuit. Remove breakout box, and reconnect all components. Drive vehicle for 5 minutes at 55 MPH. Repeat QUICK TEST.

55) Check HO2S Circuit For Short To Ground Turn ignition off. Leave breakout box installed and PCM disconnected. Disconnect HO2S. Measure resistance between HO2S circuit test pin and test pins No. 24, 51 76, 77 and 103 at breakout box. If all readings are 10,000 ohms or more, go to next step. If any reading is less than 10,000 ohms, repair short circuit. Remove breakout box and reconnect all components. Drive vehicle at 55 MPH for 5 minutes and repeat QUICK TEST.

56) Check HO2S For Short To Ground Ensure ignition is off and PCM is disconnected. Connect HO2S to wiring harness connector. Measure resistance between HO2S test pin and test pin No. 91 at breakout box. Measure resistance between HO2S test pin and test pins No. 24, 76 and 103 at breakout box. If any resistance measurement is less than 10,000 ohms, replace HO2S. Remove breakout box and reconnect all components. Drive vehicle for 5 miles at 55 MPH and repeat QUICK TEST. If resistance is 10,000 ohms or more, perform following procedure as applicable

1. For DTCs P1130 and P1150, go to next step.
2. For Continuous Memory DTCs P1131 and P1151, go to step 62).
3. For KOER codes P1131 and P1151, replace PCM.

57) Perform KOER Self-Test Start engine, and warm it to normal operating temperature. With scan tester connected, perform KOER self-test. If DTCs P1132 and P1152 are present, go to next step. If codes are not present, fault is intermittent. Go to CIRCUIT TEST Z.

58) Check For HO2S Short To Power DTCs P1130, P1150 and/or P1132, P1152 indicate HO2S is always rich. Possible causes are as follows

1. Moisture inside HO2S wiring harness connector.
2. HO2S circuit shorted to power.

Turn ignition off. With scan tool connected, access PID for code generated. If 1.0-4.0 volts are present, go to next step. If 1.0-4.0 volts are not present, go to step 61).

59) Check For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair wiring as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Leave suspect HO2S disconnected. Measure resistance between HO2S terminal of wiring harness connector and following test pins at breakout box

1. DTC P01130 and P01132; test pin No. 60 and test pins No. 71, 93 and 97.
2. DTC P01150 and P01152; test pin No. 87 and test pins No. 71, 93 and 97.

If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to power and repeat QUICK TEST.

60) Leave ignition off and HO2S disconnected. Remove breakout box and reconnect PCM. Using scan tool, access HO2S PID of suspect sensor. If HO2S voltage is less than 0.2 volt, replace HO2S sensor and repeat QUICK TEST. If HO2S voltage is 0.2 volts or more, replace PCM and repeat QUICK TEST.

61) Attempt To Generate DTC P1131 or P1151 Leave ignition off and HO2S disconnected. Using a jumper wire, connect HO2S terminal of wiring harness connector to negative battery terminal. Perform KOER self-test. If DTC P1131 or P1151 is present, remove jumper wire and go to next step. If DTC P1131 or P1151 is not present, replace PCM and repeat QUICK TEST.

62) HO2S Check Connect DVOM between HO2S terminal and SIG RTN terminal of wiring harness connector. Disconnect 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.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 62) to step 70). No test procedures have been omitted.

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 and repair as necessary.

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.

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.

80) DTC P0136 & P0156 DTCs P0136 and P0156 indicate that output voltage of downstream HO2S is within a functional window. Possible causes are as follows

1. Damaged wiring harness or connector.
2. Exhaust system leaks.
3. Contaminated or defective HO2S.

Inspect for faults. Repair or replace as 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 80) to step 82). No test procedures have been omitted.

82) Check For Crossed HO2S Circuit Turn ignition off. Disconnect suspect HO2S. Perform KOER self-test. If trouble code corresponding to disconnected HO2S is present, circuit is not crossed; go to next step. If trouble code corresponding to disconnected HO2S is not present, check for crossed wires. Repair as necessary and repeat KOER self-test.

83) Check HO2S Circuit For Short Circuit 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 HO2S test pin and test pins No. 24, 76, 103 (PWR GND), 71, 97 (VPWR), 90 (VREF) and 91 (SIG RTN) at breakout box. Measure resistance between HO2S test pin and VPWR test pin at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit in wiring harness. Clear PCM memory. Drive vehicle for 5 miles and repeat QUICK TEST.

84) Check Ground Circuit Continuity Leave ignition off and suspect HO2S disconnected. Measure resistance between HO2S test pin at breakout box and HO2S 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. Drive vehicle for 5 miles and repeat QUICK TEST. If resistance is less than 5 ohms, go to next step.

85) Check HO2S Circuit Continuity Turn ignition off. Connect scan tester to DLC. Ensure suspect HO2S and PCM are connected. Turn ignition on. Access HO2S PID of suspect sensor. If voltage reading is 1.5 or more, go to step 87). If voltage is less than 1.5 volts, go to next step.

86) Check PCM Ground Circuit Continuity Turn ignition off. Connect PCM to breakout box. Disconnect vehicle wiring harness from breakout box. Measure resistance between test pin No. 91 and test pins No. 24, 76 and 103 at breakout box. If resistance is less than 5 ohms, replace HO2S. Drive vehicle for 5 miles and repeat QUICK TEST. If resistance is 5 ohms or more, replace PCM. Drive vehicle for 5 miles and repeat QUICK TEST.

87) Check PCM Voltage Leave suspect HO2S disconnected. Turn ignition on. Measure voltage between SIG RTN terminal at wiring harness connector and negative battery terminal. Measure voltage between HO2S SIGNAL terminal at wiring harness connector and negative battery terminal. If voltage is 1.5 volts or more, replace PCM. Drive vehicle for 5 miles and repeat QUICK TEST. If voltage is less than 1.5 volts, replace HO2S. Drive vehicle for 5 miles and repeat QUICK TEST.

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

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

CIRCUIT TEST ACRONYMS

1) Check System Integrity Turn ignition off. Inspect fuel system for leaks, damage or kinked hoses. Inspect wiring harness for damage or loose connectors. Ensure battery is fully charged and fuses are okay. If vehicle does not start, ensure vehicle has fuel in tank and inertia switch is set correctly. Repair or replace as necessary. If no faults are found, go to next step.

2) Check Fuel Pressure Release fuel system pressure. Turn ignition off. Install fuel pressure gauge. Connect scan tester to DLC. Turn ignition on. Access scan tester Output Test Mode. Operate fuel pump at maximum fuel pressure. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to step 9).

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) Check Pressure Regulator Diaphragm With fuel pressure gauge installed, start engine and operate for 10 seconds. Turn ignition off and wait 10 seconds. Start engine again and operate for 10 seconds. Turn ignition off. Disconnect and inspect hose from fuel pressure regulator. If hose is wet with fuel, replace fuel pressure regulator. If hose is dry, go to step 11).

5) Check Fuel Pressure; Test Drive Vehicle With fuel pressure gauge installed, disconnect and plug fuel pressure regulator hose. Ensure fuel pressure gauge can be seen by vehicle operator. Drive vehicle while noting gauge reading during heavy acceleration. If gauge reading stays within 3 psi of original pressure reading, go to next step. If gauge reading does not stay within 3 psi of original pressure reading, go to step 8).

6) 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

1. Fuel pressure gauge reading increases and vacuum gauge reading decreases.
2. 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) Check Vacuum Supply Turn ignition off. Disconnect and plug fuel pressure regulator hose. Install vacuum pump to fuel pressure regulator. Start engine and operate at idle. Observe fuel pressure gauge while applying vacuum to regulator. If fuel pressure changes as vacuum changes, system is okay and testing is complete. If fuel pressure does not change as vacuum changes, replace fuel pressure regulator.

8) Check Fuel Filter Turn ignition off. Connect scan tester to DLC. Replace fuel filter. Turn ignition on. Enter Output Test Mode (OTM) and operate fuel pump. Compare fuel pressure gauge readings. If gauge readings are 35-40 psi (240-280 kPa), system is okay. Return to step 3). If gauge readings are not as specified, go to step 12).

9) Check Fuel Pressure Regulator Leave ignition off and scan tester connected to DLC. Release fuel system pressure. Disconnect fuel hose at fuel rail. Connect hose to fuel rail and put opposite end of hose in clean, one quart container. Turn ignition on. Enter Output Test Mode (OTM) to turn fuel pump on. Note fuel pressure and fuel returning to container. Exit OTM to turn fuel pump off. If fuel pressure is 35-40 psi with fuel returning to container, go to next step. If fuel pressure is not 35-40 psi with fuel returning to container, replace fuel pressure regulator.

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) 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.

12) Check Fuel Pump Voltage Turn ignition off. Ensure scan tester is connected to DLC. Disconnect fuel pump wiring harness connector. Check connector terminals for damage and repair as necessary. Enter Output Test Mode (OTM) and activate fuel pump circuit. Check voltage at fuel pump connector. If voltage is 10.5 volts or more, check fuel pump ground connection. Repair as necessary. If ground connector is okay, replace fuel pump. If voltage is less than 10.5 volts, isolate source of low voltage and repair as necessary.

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

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

Identifying CKP Sensor & Crankshaft Wheel. Scheme 22

MISFIRE TROUBLE CODES

1) Check Possible Cause Of Misfire If vehicle runs out of fuel, a trouble code may be stored in PCM memory. If vehicle has recently run out of fuel, clear PCM memory. If vehicle has not recently run out of fuel, go to next step.

2) Check For Continuous DTCs If continuous codes are present, service as necessary. Disregard misfire codes at this time. If no other misfire codes are present, go to next step.

3) Check For Other DTCs If any other DTCs are present, service as necessary. Disregard misfire codes at this time. If no other DTCs are present, check spark plugs and spark plug wires. If spark plugs and spark plug wires are okay, go to step 8).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 8). No test procedures have been omitted.

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 CIRCUIT TEST H, step 47).

9) Check Fuel Injector Drive Signal With ignition off, connect PCM to breakout box. Connect a non-powered 12-volt test light between test pin No. 71 or 97 and suspect fuel injector test pin at breakout box. Crank or start engine. If test light glows dimly, system is operating correctly. Clean fuel injectors. Drive vehicle for 5 miles and repeat QUICK TEST. If test light does not glow dimly (no light/bright light), replace PCM and repeat QUICK TEST.

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 article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to CIRCUIT TEST HC, step 9).

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 CIRCUIT TEST HC, step 9).

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.

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.

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.

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.

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.

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.

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. Apply 16 in. Hg to manifold side of CANP solenoid. 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.

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.

Perform this test when instructed by QUICK TEST. For EGR system schematic, see the THEORY/OPERATION - 3.8L article. This test is only intended to diagnose

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

EVR Solenoid Wiring Harness Connector Terminals. Scheme 23

1) DTC P1400: Check DPFE Voltage This code indicates open in DPFE SIG circuit. Possible causes for this fault are

1. Leaking upstream pressure hose.
2. DPFE SIG shorted to GND or SIG RTN circuit.
3. VREF shorted to GND or SIG RTN circuit.
4. Faulty DPFE sensor.
5. 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) 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.

3) Measure VREF Voltage At DPFE Sensor Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to step 4). If voltage is not 4-6 volts, go to CIRCUIT TEST C.

4) 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. If any measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.

6) Wiggle Test Sensor & Harness With ignition off, connect scan tester to DLC. Turn ignition on. Access DPFE PID with scan tester. Observe DPFE PID for indication of fault while shaking and bending DPFE sensor wiring harness and connector. Tap lightly on DPFE sensor to simulate road shock. An indication of fault is a sudden change in DPFE PID voltage. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.

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

1. Open circuit in DPFE SIG or SIG RTN circuit.
2. DPFE SIG shorted to VREF or PWR circuit.
3. VREF shorted to PWR circuit.
4. Faulty DPFE sensor.
5. Faulty PCM.

With ignition off, connect scan tester to DLC. Turn ignition on. Access DPFEGR PID. If voltage is more than 4.0 volts, go to next step. If voltage is 4.0 volts or less, go to step 19).

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 step 12). If voltage is less than 10.5 volts, go to step 13).

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. If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST.

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.

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.

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. If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

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.

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. If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat QUICK TEST.

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. If resistance is 10,000 ohms or less, repair short between DPFE SIG and VREF circuit. Repeat QUICK TEST.

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.

20) DTC P0402: Check EGR Flow At Idle This code indicates PCM has detected EGR flow at idle. Possible causes for this fault are

1. EGR valve stuck open.
2. EVR solenoid vent plugged.
3. EVR circuit shorted to ground.
4. Excessively worn or damaged vacuum hose.
5. Faulty EVR solenoid.
6. Faulty PCM.

Note. If Continuous Memory Code P1405 is present, go to step 50).

With ignition off, disconnect and plug EGR vacuum hose. Perform KOER self-test. If DTC P0402 is present, service or replace EGR valve. If DTC P0402 is not present, go to next step.

21) Turn ignition off. Reconnect EGR vacuum hose. Perform KOER self-test. If DTC P0402 is present, go to next step. If DTC P0402 is not present, go to step 30).

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.

23) Check DPFE Sensor Output Turn ignition off. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor downstream port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than one volt. If PID voltage is as specified, replace DPFE sensor and repeat QUICK TEST. If PID voltage is not as specified, go to next step.

24) Check EGR Flow At Idle With EVR Solenoid Disconnected Turn ignition off. Disconnect EGR valve vacuum hose. Connect vacuum gauge to hose. Start engine and allow to idle. While observing vacuum gauge, disconnect EVR solenoid. If vacuum gauge reads 1.6 in. Hg or less, go to next step. If vacuum gauge reads more than 1.6 in. Hg, go to step 26).

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. If solenoid is not plugged or restricted, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.

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.

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, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair short between EVR circuit and ground.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 27) to step 30). No test procedures have been omitted.

30) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, go to next step. If voltage readings are not as specified, replace DPFE sensor. Clear PCM memory and repeat QUICK TEST.

31) Check DPFE SIG Voltage Leave ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Connect vacuum hose to EGR valve and plug hose. Start engine and allow to idle. Observe DPFEGR PID voltage at idle and compare to KOEO voltage. If voltage is higher at idle, apply 2-3 in. Hg to EGR valve and release vacuum. Repeat several times while observing DPFEGR PID voltage on scan tool. DPFEGR PID voltage should increase as valve begins to open and return to initial value as vacuum is released. A slow to return voltage is an indication of a slow closing EGR valve. If DPFEGR PID does not indicate fault, go to next step. If fault is indicated by DPFE PID, service or replace EGR VALVE. Clear PCM memory and repeat QUICK TEST.

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.

33) Check EVR Solenoid For Restriction Turn ignition off. Disconnect EVR solenoid vent filter. Inspect for contamination or water. Remove EGR vacuum hose and inspect for restriction. Repair or replace as necessary. If no faults can be found, problem is intermittent and cannot be identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 33) to step 40). No test procedures have been omitted.

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 24) If hoses are not routed correctly, repair as necessary. Clear PCM memory and repeat QUICK TEST. If hoses are routed correctly, problem cannot be identified at this time. Clear PCM memory and repeat QUICK TEST.

Identifying DPFE Vacuum Circuit. Scheme 24

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.

50) DTC P1405: Check For Upstream Pressure Hose Connection Check upstream hose for clean, tight connection. (Scheme 24) Repair as necessary. Clear PCM memory and repeat QUICK TEST. If hose is okay, go to next step.

51) Inspect Upstream Pressure Hose Check upstream hose for clean, tight connection. Ensure hose is not pinched, wet or contaminated. Repair as necessary. Clear PCM memory and repeat QUICK TEST. If hose is okay, go to next step.

52) Inspect Orifice Tube Assembly & DPFE Sensor Check DPFE sensor port for restriction or damage. Inspect exhaust manifold side pressure pick-up tube at the orifice tube assembly for restriction or damage. Repair as necessary. Clear PCM memory and repeat QUICK TEST. If no faults are found, clear PCM memory and repeat QUICK TEST. If hose is okay, go to next step.

53) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltages are not as specified, replace DPFE sensor and repeat QUICK TEST. If voltage readings are as specified, fault is intermittent and cannot be duplicated at this time. Clear PCM memory and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 60). No test procedures have been omitted.

60) DTC P1406: Check For Downstream Pressure Hose Connection Check downstream hose for clean, tight connection. (Scheme 24) Repair as necessary. Clear PCM memory and repeat QUICK TEST. If hose is okay, go to next step.

61) Inspect Downstream Pressure Hose Check downstream hose for clean, tight connection. Ensure hose is original equipment. Ensure hose is not pinched, wet or contaminated. Repair as necessary. Clear PCM memory and repeat QUICK TEST. If hose is okay, go to next step.

62) Inspect Orifice Tube Assembly & DPFE Sensor Check DPFE sensor port for restriction or damage. Inspect intake manifold side pressure pick-up tube at the orifice tube assembly for restriction or damage. Repair as necessary. Clear PCM memory and repeat QUICK TEST. If no faults are found, go to next step.

63) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltages are not as specified, replace DPFE sensor and repeat QUICK TEST. If voltage readings are as specified, fault is intermittent and cannot be duplicated at this time. Clear PCM memory and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 63) to step 70). No test procedures have been omitted.

70) DTC P0401 & P1407 These codes indicate self-test has detected no EGR flow. Possible causes are as follows

1. EGR valve stuck closed.
2. EGR valve diaphragm leak.
3. EGR flow plugged or restricted.
4. Faulty EGR hose.
5. EVR VPWR circuit open.
6. EVR VPWR circuit to PCM open or shorted to PWR.
7. DPFE sensor VPWR circuit open.
8. DPFE sensor hoses faulty.
9. Faulty DPFE sensor.
10. Faulty EVR solenoid.
11. Faulty PCM.

If fault is currently present, KOER code P1408 should be present. Perform KOER self-test. If DTC P1408 is present, go to next step. If DTC P1408 is not present, go to step 90).

71) DTC P1408 This code indicates KOER self-test has detected EGR flow out of range. Possible causes are as follows

1. EGR valve stuck closed.
2. EGR valve diaphragm leak.
3. EGR flow plugged or restricted.
4. Faulty EGR hose.
5. EVR VPWR circuit open.
6. EVR VPWR circuit to PCM open or shorted to PWR.
7. DPFE sensor VPWR circuit open.
8. DPFE sensor hoses faulty or reversed.
9. Downstream pressure hoses plugged or removed.
10. Faulty orifice tube assembly.
11. Faulty DPFE sensor.
12. Faulty EVR solenoid.
13. Faulty PCM.

Retrieve Continuous Memory DTCs. If any codes except DTCs P1403 or P1406 are present, service as necessary before continuing. If DTC 1403 is present, go to step 40). If DTC 1406 is present, go to step 60). If no codes are present, go to next step.

72) Perform KOER SELF-TEST While Monitoring EGR Vacuum Disconnect vacuum hose from EGR valve. Connect hose to vacuum gauge. Perform KOER self-test while monitoring gauge. Disregard DTCs set during this test. About 30 seconds into test, EGR vacuum should rise to 1.6 in Hg or more. If vacuum is correct, go to next step. If vacuum is incorrect, go to step 80).

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.

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, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

75) Vacuum Check DPFE Sensor Output Turn ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 8-9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, replace DPFE sensor. Clear PCM memory and repeat QUICK TEST. If voltages are not as specified, go to next step.

76) Check EGR Valve Function Turn ignition off. Leave scan tester connected to DLC. Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tester, access DPFEGR and RPM PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 10 seconds. It may be necessary to increase engine speed to avoid stalling. 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.

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.

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.

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.

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.

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.

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.

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. If vacuum gauge is less than 4 in. Hg, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 85) to step 90). No test procedures have been omitted.

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.

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.

Note. In cold climate, EGR valve may freeze shut and thaw when engine warms, causing intermittent trouble code to be set in PCM memory.

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 switch 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. If no faults are indicated, symptom cannot be identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 110). No test procedures have been omitted.

110) DTC P1409 This code indicates self-test has detected electrical malfunction in EVR circuit. Possible causes are as follows

1. EVR circuit open or shorted.
2. Faulty EVR solenoid.
3. 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.

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.

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.

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 resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is less than 10,000 ohms, repair EVR circuit short to PWR or PWR GND and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 113) to step 120). No test procedures have been omitted.

120) Continuous Memory DTC P1409 This continuous DTC indicates self-test has detected electrical malfunction in EVR circuit. Possible causes are as follows

1. EVR circuit open or shorted.
2. Faulty EVR solenoid.
3. Faulty PCM.

Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 47 (EVR) and No. 24 (PWR GND) at breakout box. Voltage should be more than 10.5 volts. Observe voltmeter for indication of fault while wiggling EVR wiring harness and connector. Fault is indicated by a sudden jump in voltage reading. Tap lightly on sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no faults are indicated, symptom cannot be identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 120) to step 130). No test procedures have been omitted.

130) DTC P0400 This code indicates EGR system malfunction. Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using scan tester, access DPFEGR PID. If voltage is more than 0.2 volt, go to next step. If voltage is 0.2 volt or more, go to step 134).

131) Leave ignition on. If DPFEGR PID value is less than 4 volts, go to next step. If DPFE PID value is 4 volts or more, go to step 137).

132) Start engine and allow to idle. If DPFEGR PID value increases by 0.15 volt or more, go to next step. If DPFEGR PID voltage increases by less than 0.15 volt, go to step 160).

133) Turn ignition off. Disconnect and plug EGR hose. Compare voltage to previous voltage. If DPFEGR PID value increases by 0.15 volt or more, service or replace EGR valve and repeat QUICK TEST. If DPFEGR PID voltage does not increase by 0.15 volt, go to step 150).

134) Generate Opposite DPFE Signal Turn ignition off. Disconnect DPFE wiring harness connector. Using a jumper wire, connect DPFE SIG and VREF terminals at wiring harness connector. Turn ignition on. Using scan tester, access DPFEGR PID. If scan tester error occurs, disconnect jumper wire and go to next step. If DPFEGR PID value is not 4-6 volts, go to next step. If DPFEGR PID value is 4-6 volts, replace DPFE sensor and repeat QUICK TEST.

135) Measure VREF Voltage At DPFE Sensor Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

136) Check DPFE SIG For Short To Ground Leave DPFE sensor disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 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. If any measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

137) Check DPFE SIG For Short To Power Turn ignition off. Disconnect DPFE wiring harness connector. Turn ignition on. Measure voltage between DPFE SIG terminal at wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 139).

138) Leave ignition off and DPFE sensor disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 65 (DPFE SIG) and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is 10.5 volts or more, repair short between DPFE SIF and PWR circuit. Repeat QUICK TEST. If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST.

139) Generate Opposite DPFE Signal Turn ignition off. Disconnect DPFE wiring harness connector. Using a jumper wire, connect DPFE SIG and SIG RTN terminals at wiring harness connector. Turn ignition on. Using scan tester, access DPFEGR SIG PID. If scan tester error occurs, disconnect jumper wire and go to step 144). If DPFEGR PID value is .05 volt or more, go to step 142). If DPFEGR PID value is less than .05 volt, remove jumper wire and go to next step.

140) Verify VREF Is Within Range Leave DPFE sensor disconnected. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFE wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

141) Check DPFE SIG For Short To VREF Leave DPFE sensor disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 90 (VREF) at breakout box. If resistance is 10,000 ohms or more, replace DPFE sensor and repeat QUICK TEST. If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

142) Check DPFE SIG For Open Circuit Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and DPFE SIG terminal at DPFE sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

143) Check SIG RTN For Open Circuit Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal of DPFE sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat QUICK TEST. If resistance is 5 ohms or more, repair open in SIG RTN circuit and repeat QUICK TEST.

144) Check DPFE SIG For Short To VREF Leave ignition off and DPFE sensor disconnected. Measure resistance between test pin No. 65 (DPFE SIG) and 90 (VREF) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair short between DPFE SIG and VREF circuit. Repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 144) to step 150). No test procedures have been omitted.

150) Check EGR System Vacuum Hoses Using vehicle's vacuum diagram label, check EGR system vacuum hoses for damage, tight connections and correct routing. If hoses are okay, go to next step. If hoses are not okay, repair as necessary. Clear PCM memory and repeat QUICK TEST.

151) Check EGR Flow At Idle With EVR Solenoid Disconnected Turn ignition on. Using scan tester, not DPEGR PID voltage. Disconnect EVR solenoid connector. Start engine and allow to idle. If DPFEGR PID value increases by 0.15 volt or more, go to next step. If DPFEGR PID voltage increase by less than 0.15 volt, go to step 153).

152) Check EVR Vent Turn ignition off. Disconnect EVR solenoid vent cap and vacuum hoses. Remove EVR filter and inspect for restriction. Using a vacuum pump, apply 15 in. Hg to EVR vent. If EVR solenoid is plugged or restricted, repair or replace as necessary. Clear PCM memory and repeat QUICK TEST. If solenoid is not plugged or restricted, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.

153) Check EVR Solenoid Coil Resistance Turn ignition off. Disconnect EVR solenoid wiring harness connector. Measure resistance between EVR terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.

154) Check DPFE Sensor Output Leave ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, go to next step. If voltages are not as specified, replace DPFE sensor. Clear PCM memory and repeat QUICK TEST.

155) Check EVR Circuit For Short To Ground Leave ignition off and EVR solenoid disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 47 (EVR) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair short between EVR circuit and ground.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 155) to step 160). No test procedures have been omitted.

160) Check For Reversed Pressure Hoses Check hoses for proper connection. DPFE port marked HI should connect to exhaust side of orifice tube. DPFE port marked REF should connect to intake side of orifice tube. (Scheme 24) If hoses are not routed correctly, repair as necessary. Clear PCM memory and repeat QUICK TEST. If hoses are routed correctly, go to next step.

161) Inspect Pressure Hoses Check both pressure hoses between DPFE sensor and EGR orifice tube for clean, tight connection. Ensure hoses are original equipment. Ensure hose is not pinched, wet, frozen or contaminated. Repair as necessary. Clear PCM memory and repeat QUICK TEST. If hoses are okay, go to next step.

162) Vacuum Check DPFE Sensor Output Turn ignition off. Connect scan tester to DLC. Disconnect pressure hoses at DPFE sensor. Connect vacuum pump to DPFE sensor port marked REF. Turn ignition on. Using scan tester, access DPFEGR PID. PID voltage should be 0.2-0.7 volt. Apply 8-9 in. Hg to DPFE sensor. PID voltage should be more than 4.0 volts. Release vacuum from sensor. PID voltage should drop to less than one volt in less than 3 seconds. If voltage readings are as specified, replace DPFE sensor. Clear PCM memory and repeat QUICK TEST. If voltages are not as specified, go to next step.

163) Check EGR Valve Function Turn ignition off. Leave scan tester connected to DLC. Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tester, access DPFEGR and RPM PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 10 seconds. It may be necessary to increase engine speed to avoid stalling. As vacuum increases, PID voltage should rise above 2.5 volts. When vacuum is held steady, PID voltage should hold steady. If vacuum is as specified, reconnect all components and go to next step. If vacuum is not as specified, service or replace EGR valve. Clear PCM memory and repeat QUICK TEST.

164) Check EVR Solenoid Vacuum Inspect EVR solenoid and EGR vacuum hoses for leaks, restrictions, damage or incorrect routing. Repair as necessary. Disconnect vacuum hoses at EVR solenoid. Connect vacuum pump to EVR solenoid vacuum supply hose. Start engine and allow to idle. If vacuum gauge reading is 15 in. Hg or more, go to next step. If vacuum gauge reading is less than 15 in. Hg, isolate fault and repair as necessary. Clear PCM memory and repeat QUICK TEST.

165) Check VPWR To EVR Solenoid Turn ignition off. Disconnect EVR solenoid wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at EVR solenoid wiring harness connector and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat QUICK TEST.

166) Check Resistance at EVR Solenoid Turn ignition off. Leave EVR solenoid wiring harness connector disconnected. Measure resistance across EVR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.

167) Check EVR For Short To PWR Leave EVR solenoid disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 47 (EVR) at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair EVR circuit short to PWR. Clear PCM memory and repeat QUICK TEST.

168) Check EVR Circuit For Open In Harness Leave ignition off and EVR solenoid disconnected. Measure resistance between test pin No. 47 (EVR) and EVR terminal at EVR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EVR circuit. Clear PCM memory and repeat QUICK TEST.

169) 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. If vacuum gauge is less than 4 in. Hg, replace EVR solenoid. Clear PCM memory and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 169) to step 180). No test procedures have been omitted.

180) Continuous Memory DTC P0400 This DTC indicates EGR system malfunction during vehicle operation. Possible causes are as follows

1. Restriction in EGR vacuum circuit.
2. EGR system fault.

Ensure all DTCs are recorded. Clear PCM memory. Drive vehicle 5 miles. Perform KOEO and KOER self-test. If DTC P0400 is present in KOEO or KOER, go to step 130). If DTC is present in continuous memory only, remove and inspect EGR valve and intake manifold. Repair as necessary. If DTC P0400 is not present, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z.

CIRCUIT TEST HF - CATALYST EFFICIENCY MONITOR &

EXHAUST SYSTEMS

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 TROUBLE CODES

1) DTC P0420 & P0430: Check Possible Cause Of Misfire DTC P0420 indicates bank one catalyst system efficiency is minimum requirement. DTC P0430 indicates bank 2 catalyst system efficiency is minimum requirement. Possible causes are as follows

1. Use of leaded fuel.
2. Oil contamination.
3. Cylinder misfire.
4. Fuel pressure too high.
5. HO2S sensor improperly connected.
6. Damaged exhaust system component.
7. Faulty ECT sensor.
8. 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) 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) 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) If any codes except P0420 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) 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) 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 article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to CIRCUIT TEST HC.

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) 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) 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) 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) 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.

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 25

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) 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) Check Evaporative Emission System Disconnect evaporative emission hose from PCV system and plug connector. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, isolate vacuum leak or restriction and repair as necessary. If vacuum from hose holds paper in place for one minute, go to CIRCUIT TEST HV.

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

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

Identifying TA System Circuits & System Components. Scheme 26

Identifying TP-B Operational Range. Scheme 27

Identifying TA System Connectors & Test Circuits. Scheme 28

1) DTC P0222; Verify TP-B Voltage This DTC indicates TP-B voltage was below minimum during self-test. Possible causes are as follows

1. Open or shorted TP-B circuit.
2. Open or shorted VREF circuit.
3. Faulty TP-B.
4. 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) Turn ignition off. Disconnect TP-B wiring harness connector. Inspect connector for damage and repair if necessary. Connect jumper wiring 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. If voltage is not 4-6 volts, go to next step.

3) Leave TP-B disconnected. Turn ignition on. Measure voltage between connector terminals SIG RTN (Gray/Red wire) and VREF (Brown/White wire). If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

4) Check TP-B For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 63 (TP-B) at the breakout box and TP-B (Yellow/White wire) terminal of TP-B wiring harness connector. If resistance is 5 ohms or more, repair open in TP-B circuit and repeat QUICK TEST. If resistance is less than 5 ohms, go to next step.

5) Check TP-B Circuit For Short To Ground Or SIG RTN Turn ignition off. Measure resistance between test pin No. 63 (TP-B) and test pins No. 51, 91 and 103 (PWR GND) at the breakout box. If resistance is 10,000 ohms or more, replace PCM and repeat QUICK TEST. If resistance is less than 10,00 ohms, repair TP-B circuit short to ground or SIG RTN and repeat QUICK TEST.

6) Wiggle Test Turn ignition on. Using scan tester, access TPB PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage. Lightly tap on sensor. Wiggle wiring harness between TP-B and PCM. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.

10) DTC P0222: Verify TP-B Voltage This DTC indicates TP-B voltage was above maximum during self-test. Possible causes are as follows

1. TP-B circuit shorted to VREF.
2. TP-B circuit shorted to PWR.
3. SIG RTN circuit open.
4. Faulty TP-B.
5. Faulty PCM.

Turn ignition off. 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).

11) Turn ignition off. Disconnect TP-B. Inspect connector for damage and repair if necessary. Turn ignition on. Measure voltage between connector terminal TP-B (Yellow/White wire) and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 13).

12) Check TP-B For Short To PWR 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. If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST.

13) Turn ignition off. Disconnect TP-B wiring harness connector. Turn ignition on. Using scan tester, access TPB PID. If PID voltage is less than one volt, go to next step. If voltage is one volt or more, go to step 15).

14) Leave TP-B disconnected. Turn ignition on. Measure voltage between connector terminals SIG RTN (Gray/Red wire) and VREF (Brown/White wire). If voltage is 4-6 volts, replace TP-B and repeat QUICK TEST. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

15) Check TP-B Circuit For Short To VREF Turn ignition off. Leave TP-B disconnected. 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. If resistance is less than 10,00 ohms, repair TP-B circuit short to VREF and repeat QUICK TEST.

16) Wiggle Test Turn ignition on. Using scan tester, access TPB PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage. Lightly tap on sensor. Wiggle wiring harness between TP-B and PCM. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 20). No test procedures have been omitted.

20) DTC P0222: Inspect Series Throttle (ST) System This DTC indicates series throttle control malfunctioned during self-test. Possible causes are as follows

1. Stepper motor circuit fault.
2. PWR GND circuit open to Series Throttle Controller (STC).
3. SIG RTN circuit open to Series Throttle Controller (STC).
4. VPWR circuit open to Series Throttle Controller (STC).
5. TAPW circuit open or shorted.
6. Faulty Series Throttle (ST).
7. Faulty ST stepper motor.
8. Faulty STC.
9. 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).

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. If throttle does not bind, replace series throttle and repeat QUICK TEST.

22) 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

1. TA-B1 and BCOMM.
2. TA-B2 and BCOMM.
3. TA-A1 and ACOMM.
4. 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.

Identifying Stepper Motor Terminals. Scheme 29

23) 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. 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.

24) 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. If all resistance measurements are less than 5 ohms, go to next step.

25) Check ST Stepper Motor Circuit For Short Leave ignition off. Measure resistance of each terminal of ST stepper motor connector and all other terminals of ST stepper motor connector. Measure resistance of each terminal of ST stepper motor connector and negative battery terminals. If all resistance measurements are 10,000 ohms or more, go to next step. If any resistance measurements is 10,000 ohms or less, go to next step.

26) Check Circuit Voltage To STC Leave STC disconnected. Turn ignition on. Measure voltage between VPWR terminal of STC 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 and repeat QUICK TEST.

27) Turn ignition off. Leave STC disconnected. Measure resistance between SIG RTN terminal of STC connector and negative battery terminal. Measure resistance between PWR GND terminal of STC connector and negative battery terminal. 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.

28) 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. 8 (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.

29) Leave STC disconnected. Measure voltage between test pin No. 8 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.

30) Turn ignition off. Leave STC disconnected. Measure resistance between test pin No. 8 (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. If resistance is 10,000 ohms or more and DTC 1220 is present, go to next step. If resistance is 10,000 ohms or more and DTC 1220 is not present, fault is intermittent and cannot be duplicated at this time. Go to CIRCUIT TEST Z.

31) Leave ignition off and STC disconnected. Connect DVOM between test pin No. 8 (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. If DVOM does not indicate a brief change of voltage, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 40). No test procedures have been omitted.

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

1. TP-B sensor binding or sticking.
2. Throttle stop screw misadjusted.
3. Faulty TP-B.
4. Faulty ST.

Check throttle linkage for binding or sticking. Repair if necessary. If throttle linkage is okay, go to next step.

41) Turn ignition off. Disconnect air tube from ST assembly. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access TPB PID. While observing PID voltage, push throttle plate shut and then release. Throttle plate should not bind or stick. If TPB-PID is 0.3-0.9 volt at wide open throttle, go to next step. If TPB-PID is not 0.3-0.9 volt at wide open throttle, check ST stepper motor and TP-B for damage. If no damage is present, replace TP-B and repeat QUICK TEST.

42) Turn ignition off. Disconnect TP-B wiring harness connector. Inspect connector for damage and repair if necessary. Turn ignition on. Measure voltage between SIG RTN and VREF terminal of TP-B wiring harness connector. If voltage is 4-6 volts, replace TP-B and repeat QUICK TEST. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

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

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

Air Intake Circuit & Components Schematic. Scheme 30

Identifying IMRC Connector Terminals. Scheme 31

1) Confirm Drive Symptom Test drive vehicle. Check for any of the following symptoms

1. Accelerator pedal sticking or binding.
2. Hard start/long cranking.
3. Hesitation or stalls at idle.
4. Rough idle.
5. 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) Check Accelerator Linkage If linkage sticks, binds or grabs, go to next step. If linkage operation is okay, go to step 7).

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) Check Throttle Return Screw Leave ignition off and accelerator linkage disconnected from throttle body. Remove clean air tube from throttle body. Inspect clean air tube for dirt or contamination and repair as necessary. Check throttle return screw. If throttle return screw is in contact with throttle linkage lever arm when throttle is fully closed, go to step 6). If throttle screw is not as specified, place a .002" (.05 mm) feeler gauge between throttle return screw and lever arm. Turn screw until it contacts feeler gauge. Remove feeler gauge. Turn throttle adjust screw 1/2 turn clockwise and go to next step.

5) Check TP Sensor Range Turn ignition off. Connect scan tester to DLC. Using scan tester, access TP PID. While observing TP PID, slowly move throttle from closed to open position. TP PID reading changes should be smooth while rotating throttle. At closed position, TP PID reading should be 0.66-1.20 volts (13-24%). If TP output is as specified, remove scan tester and go to next step. If TP output is not as specified, replace throttle body assembly.

6) Check Throttle Body Leave ignition off. Disconnect cable from throttle body. Remove clean air tube. Snap throttle from wide open to closed position several times. Slowly cycle throttle from closed to wide open position. Check for freedom of travel especially during initial throttle opening. If throttle moves freely, fault cannot be duplicated or identified at this time and testing is complete. If throttle does not rotate freely, go to next step.

7) 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) Check Engine Operation Ensure that the following engine systems are in good operating condition before continuing

1. Engine cooling system.
2. Exhaust system.
3. Fuel pressure.
4. PCV system.

If systems are operating correctly, go to next step. If systems are not operating correctly, go to CIRCUIT TEST as indicated

1. Exhaust system; CIRCUIT TEST HF.
2. Fuel pressure; CIRCUIT TEST HC.
3. PCV system; CIRCUIT TEST HG.
4. Engine cooling system; repair as necessary.

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) 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 as follows

1. A/T - 21-45 percent with engine idling at 675-725 RPM.
2. M/T - 20-44 percent with engine idling at 695-745 RPM.

If IAC PID values are correct, go to next step. If IAC PID values are not correct, go to step 12).

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) 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. If engine speed changes, proceed as follows

1. For vehicles with fast idle symptom, go to next step.
2. For vehicles without fast idle symptom, check throttle body for malfunction. Repair as necessary and clear Keep Alive Memory (KAM).

13) 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. If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 15). No test procedures have been omitted.

15) DTC P1518, P1519 & P1520 DTC P1518 indicates IMRC stuck open. DTC P1519 indicates IMRC stuck closed. DTC P1520 indicates control circuit failure. Possible causes are as follows

1. Cables improperly routed, binding or seized.
2. Damaged or disconnected IMRC housing return springs.
3. Lever return stop obstructed or bent.
4. Lever wide open stop obstructed or bent.
5. 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 the ADJUSTMENTS - 3.8L article. Operate IMRC plates while checking for binding or sticking. If any faults are found, repair as necessary. If no faults are found, go to next step.

16) Check IMRC Function Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). Turn all outputs on. When IMRC is turned on, both levers should contact wide open stop. One or both levers should contact wide open stop (one lever being slightly off is acceptable). IRMC levers should cycle fully from closed to open position. If faults are present, go to next step. If no faults are present with DTC P1518, go to step 26). If no faults are present with DTC P1519, go to step 29). If no faults are present with DTC P1520, go to step 19).

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 with DTC P1518, go to step 26). If levers cycle as specified with DTC P1519, go to step 29). If levers cycle as specified with DTC P1520, go to step 19).

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, go to step 26) for DTC P1518, step 29) for DTC P1519 or step 19) for DTC P1520.

19) DTC P1520 DTC P1520 indicates control circuit failure. Possible causes are as follows

1. IMRC control circuit open or shorted.
2. Faulty IMRC module.
3. Faulty Powertrain Control Module (PCM).

Turn ignition off. Connect scan tester to Data Link Connector (DLC). Perform KOEO self-test. If DTC P1520 is still present, go to next step. If DTC P1520 is not present, go to step 36).

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.

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.

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, repair short circuit and repeat QUICK TEST.

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. 44 (IMRC) and test pins No. 51 and 103 (PWR GND) at breakout box. If each measurement is one volt or more, go to next step. If either measurement is less than one volt, repair short circuit and repeat QUICK TEST.

24) Check IMRC Circuit Driver For Open Circuit Leave ignition off and IMRC module disconnected. Measure resistance between test pin No. 44 (IMRC) 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.

25) Verify PCM IMRC Driver Reconnect IMRC module. Turn ignition on. Connect jumper wire between test pin No. 44 and test pin No. 51 and 103 at breakout box. If IMRC plates open, replace PCM and repeat QUICK TEST. If IMRC plates do not open, replace IMRC module and repeat QUICK TEST.

26) DTC P1518: Check IMRC MONITOR Circuit DTC P1518 indicates low circuit voltage. Possible causes are as follows

1. IMRC control circuit shorted.
2. Faulty IMRC module.
3. Faulty Powertrain Control Module (PCM).

Turn ignition off. Connect scan tester to Data Link Connector (DLC). Ensure IMRC plates are closed. 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) 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) Turn ignition off. Leave IMRC module disconnected. Measure resistance between IMRC terminal at wiring harness connector and negative battery terminal. If resistance is 10,000 ohms or more, replace PCM. If resistance is less than 10,000 ohms, repair short in IMRCM circuit and repeat QUICK TEST.

29) Continuous Memory DTC P1519 DTC P1518 indicates IMRC input is greater than expected. Possible causes are as follows

1. IMRC circuit open.
2. SIG RTN circuit open.
3. Faulty IMRC module.
4. Faulty Powertrain Control Module (PCM).

Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Disconnect IMRC wiring harness connector. Connect jumper wire between IMRCM wiring harness connector terminals IMRCM and SIG RTN. Using scan tester, access IMRCM PID. If PID voltage is 0.2 volt or less, go to step 32). If PID voltage is more than 0.2 volt, go to next step.

30) Turn ignition off. Leave IMRC module disconnected. Measure resistance between SIG RTN terminal at IMRC wiring harness connector and negative battery terminal. If resistance is 55 ohms or more, go to next step. If resistance is less than 55 ohms, repair short in SIG RTN circuit and repeat QUICK TEST.

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) DTC P1519: Check Circuit Operation Turn ignition off. Reconnect all components. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). While in OTM, access IMRCM PID and IMRC PID. 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) 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. Retrieve all continuous memory DTCs. If DTC 1519 is still present return to step 29). If any other DTCs are present, service as necessary. If no other DTCs are present, testing is complete.

34) 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) Leave IMRC module disconnected. Turn ignition on. Using scan tester, access IMRCM PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage to more than 1.6 volt. Wiggle wiring harness between IMRC connector and PCM connector. If fault is indicated, isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.

36) 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. 44 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) Turn ignition on. While observing IMRC plates, wiggle wiring harness between IMRC module and PCM connector. If IMRC plates open while wiggling harness, fault is indicated. Isolate and repair as necessary. If no faults are indicated, go to CIRCUIT TEST Z.

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

1. Canister Purge (CANP) solenoid.
2. Carbon canister.
3. Leaks in fuel tank, filler cap or vapor hoses.
4. Wiring harness circuits (CANP SIG, PWR GND, SIG RTN, and VPWR).
5. Faulty vapor orifice rollover valve.
6. Faulty PCM.

Identifying EVAP System Components. Scheme 32

EVAP System Wiring Diagram. Scheme 33

1) Check CANP Solenoid Function Turn ignition off. Connect scan tester to DLC. Disconnect CANP solenoid wiring harness connector. Connect DVOM positive lead to VPWR terminal and negative lead to CANP terminal of solenoid wiring harness connector. Turn ignition on. Activate scan tester Outputs mode. Measure and record CANP voltage reading on DVOM. Turn off scan tester Outputs mode. Measure and record CANP voltage reading on DVOM. Repeat on and off cycle with scan tester. If CANP voltage is less than 0.2 volt during cycle, go to step 9). If CANP voltage is 0.2 volt or more, go to next step.

2) Check CANP Resistance Turn ignition off. Disconnect CANP solenoid wiring harness connector. Measure resistance between CANP solenoid terminals. If resistance is 30-90 ohms, go to next step. If resistance is not 30-90 ohms, replace CANP solenoid. Clear PCM Memory and repeat QUICK TEST.

3) Check Carbon Canister Vehicle must have been operated for a period of time equivalent to a drive cycle to purge all fuel vapors. Check for cracks or damage to canister. Repair or replace as necessary. If canister is okay, go to next step.

4) Check EVAP System Vacuum Remove fuel vapor hose from fuel tank at canister. Attach vacuum pump with gauge to vacuum hose. Using vacuum pump, apply 1.0 in. Hg to fuel vapor hose. If system holds vacuum, go to next step. If system will not hold vacuum, isolate leak and repair as necessary.

5) Check Vacuum Hose Check vacuum hose between fuel tank and carbon canister for faults. Check for fuel tank damage. Check for damaged orifice rollover valve. Repair or replace as necessary. If no faults are found, go to next step.

6) Check CANP Solenoid Vacuum Turn ignition off. Ensure CANP solenoid is disconnected. Disconnect vacuum hose from CANP solenoid manifold side. Using a vacuum pump, apply 16 in. Hg to CANP solenoid. If vacuum is held for 20 seconds, release vacuum from solenoid and go to next step. If vacuum is not held for 20 seconds, replace CANP solenoid.

7) Check CANP Solenoid Turn ignition off. Reconnect CANP solenoid wiring harness connector. Ensure CANP solenoid vacuum hoses are disconnected. Connect scan tester to Data Link Connector (DLC). Using scan tester, access Output Test Mode (OTM). Using vacuum pump, apply 16 in. Hg to CANP solenoid. Turn ignition on. CANP solenoid should open and release vacuum when scan tester output is commanded on. If CANP solenoid functions as specified, check fuel vapor hose for leaks, restrictions or mis-routing. Repair or replace as necessary. If CANP solenoid does not function as specified, replace CANP solenoid.

8) Check Vacuum Hose Check vacuum hose between CANP solenoid and carbon canister for faults. Repair or replace as necessary. If no faults are found, go to next step.

9) Check Manifold Vacuum To CANP Solenoid Turn ignition off. Disconnect vacuum hose from CANP solenoid manifold side. Start engine and allow to idle. Check for vacuum at CANP solenoid hose. If vacuum is present, system is functioning correctly and testing is complete. If vacuum is not present, check vacuum circuit for leaks, restrictions or mis-routing. Repair or replace as necessary.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 9) to step 17). No test procedures have been omitted.

17) DTC P0443; Check VPWR Circuit Voltage Disconnect CANP solenoid wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of CANP solenoid 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.

18) Check CANP Resistance Turn ignition off. Disconnect CANP solenoid wiring harness connector. Measure resistance between CANP solenoid terminals. If resistance is 30-90 ohms, go to next step. If resistance is not 30-90 ohms, replace CANP solenoid. Clear PCM Memory and repeat QUICK TEST.

19) Check CANP SIG Circuit Continuity 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. Measure resistance between test pin No. 67 (CANP SIG) and CANP SIG terminal of CANP 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 CANP SIG circuit. Clear PCM memory and repeat QUICK TEST.

20) Check CANP SIG Circuit For Short To Ground Leave ignition off. Disconnect scan tester from DLC. Measure resistance between test pin No. 67 and test pins No. 24, 91 and 103. If each resistance reading is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in CANP SIG circuit. Clear PCM memory and repeat QUICK TEST.

21) Check CANP SIG Circuit For Short To VPWR Leave ignition off and CANP solenoid disconnected. Measure resistance between test pin No. 67 and test pins No. 71 and 91. If each resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair CANP SIG circuit short to VPWR. Clear PCM memory and repeat QUICK TEST.

22) Continuous Memory DTC P0443: Check CANP Circuit For Intermittent Failure Repeat QUICK TEST. If Continuous Memory DTC P0443 is still present, go to next step. If Continuous Memory DTC P0443 is not present, fault is intermittent and cannot be duplicated at this time. Testing is complete.

23) 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 and test pins No. 71 and 91. Observe DVOM for indication of fault while shaking and bending CANP solenoid wiring harness and connector. A fault will be indicated by resistance measurement of less than 30 ohms or more than 90 ohms. Tap lightly on CANP solenoid to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.

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

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

Identifying EVAP System Components. Scheme 34

Identifying EVAP System Test Circuit. Scheme 35

1) DTC P0443: Check VPWR Circuit Voltage 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.

2) Check VMV Resistance Turn ignition off. Disconnect VMV wiring harness connector. Measure resistance between VMV terminals. If resistance is 30-36 ohms, go to next step. If resistance is not 30-36 ohms, replace VMV. Clear PCM memory and repeat QUICK TEST.

3) Check VMV Circuit Continuity 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. Measure resistance between test pin No. 67 (VMV) 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 in VMV SIG circuit. Clear PCM memory and repeat QUICK TEST.

4) Check VMV Circuit For Short To PWR GND Leave ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 56 and test pins No. 24, 91 and 103. If each resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair short to ground in VMV circuit. Clear PCM memory and repeat QUICK TEST.

5) 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 next step.

6) Check Carbon Canister Vehicle must have been operated for a period of time equivalent to a drive cycle to purge all fuel vapors. Check for cracks or damage to canister. Repair or replace as necessary. If canister is okay, go to next step.

7) Check EVAP System Vacuum Remove fuel vapor hose from fuel tank at canister. Attach vacuum pump with gauge to vacuum hose. Using vacuum pump, apply 1.0 in. Hg to fuel vapor hose. If system holds vacuum, go to next step. If system will not hold vacuum, isolate leak and repair as necessary.

8) Check vacuum hose between fuel tank and carbon canister for faults. Check for fuel tank damage. Check for damaged orifice rollover valve. Repair or replace as necessary. If no faults are found, remove vacuum pump and go to next step.

9) Check VMV Vacuum Turn ignition off. Disconnect vacuum hose from carbon canister and VMV (manifold side). Plug either end of hose. Using a vacuum pump, apply 16 in. Hg to opposite end of hose. If vacuum is held for 15 seconds, release vacuum from solenoid and go to step 15). If vacuum is not held for 15 seconds, replace fuel vapor hose and repeat QUICK TEST.

10) Check CANP Solenoid For Vacuum Leaks Turn ignition off. Disconnect vacuum hose from CANP solenoid. Disconnect wiring harness connector. Using a 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.

11) Check CANP Solenoid Mechanical Operation Turn ignition off. Disconnect vacuum hose at both ends of CANP solenoid. Reconnect wiring harness connector. Ensure scan tester is connected to DLC. Using a vacuum pump, apply 16 in. Hg to solenoid intake manifold port. Using scan tester, access Output Test Mode. Turn ignition on. If CANP solenoid does not open (air passes freely) when output is commanded on, replace CANP solenoid and repeat QUICK TEST. If CANP solenoid does open when output is commanded on, check vapor hose between carbon canister and CANP solenoid and repair if necessary. If vapor hose is okay, go to next step.

12) Check Vacuum At CANP Solenoid Turn ignition off. Disconnect CANP solenoid and Purge Flow Sensor (PFS). Ensure vacuum hose is disconnected from CANP solenoid intake manifold port. Start engine and allow to idle. Check for vacuum at CANP terminal. If vacuum is present, go to next step. If vacuum is not present, check vacuum hoses and PFS. Repair or replace as necessary and repeat QUICK TEST.

13) Check PFS Seal Turn ignition off. Leave PFS wiring harness connector disconnected. Plug open end of vacuum hose at CANP solenoid. Disconnect PFS vacuum hose at intake manifold port. Using a vacuum pump, apply 4.1 in. Hg to intake manifold port. If vacuum bleeds off in less than 2.5 seconds, replace PFS and repeat QUICK TEST. If vacuum does not bleed of in less than 2.5 seconds, remove vacuum pump and reconnect hose to CANP solenoid. Leave vacuum hose disconnected from PFS and go to next step.

14) Check Vacuum At PFS Turn ignition off. Disconnect CANP solenoid and Purge Flow Sensor (PFS). Ensure vacuum hose is disconnected from PFS solenoid intake manifold port. Start engine and allow to idle. Check for vacuum at PFS terminal. If vacuum is present, go to step 19). If vacuum is not present, check for excessive wear causing vacuum loss. If engine is okay, go to TROUBLE SHOOTING - NO CODES article.

15) Check VMV Turn ignition off. Reconnect VMV wiring harness connector. Disconnect vacuum hose from intake manifold port at VMV. Attach vacuum pump with gauge to intake manifold port at VMV. Using vacuum pump, apply 16 in. Hg to VMV. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, cycle outputs on and off. VMV should open and release vacuum when scan tester output is commanded on. If VMV functions as specified, go to next step. If VMV does not function as specified, replace VMV and repeat QUICK TEST.

16) Check VMV Housing Turn ignition off. Ensure VMV wiring harness connector is connected. Disconnect vacuum input hose from VMV. Using a vacuum pump, apply 16 in. Hg to VMV. If vacuum bleeds off immediately, go to next step. If vacuum is not bled off immediately, replace VMV and repeat QUICK TEST.

17) Check Vacuum At VMV Vacuum Input Port Turn ignition off. Leave vacuum input hose from VMV disconnected. Start engine and allow to idle. Check for vacuum at open end of vacuum hose. If vacuum is present, reconnect hose and go to next step. If vacuum is not present, check VMV vacuum input hose for blockage or leaks and repair or replace as necessary.

18) Check Vacuum At VMV Vacuum Input Port Turn ignition off. Disconnect intake manifold port hose from VMV. Start engine and allow to idle. Check for vacuum at open end of vacuum hose. If vacuum is present, reconnect hose and go to next step. If vacuum is not present, check VMV vacuum input hose for blockage or leaks and repair or replace as necessary.

19) Check VMV Resistance Turn ignition off. Disconnect VMV wiring harness connector. Measure resistance between VMV terminals. If resistance is 30-36 ohms, go to next step. If resistance is not 30-36 ohms, replace VMV. Clear PCM memory and repeat QUICK TEST.

20) Check CANP SIG Circuit For Short To VPWR Leave ignition off and VMV disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Disconnect scan tester (if applicable). Measure resistance between test pin No. 56 and test pins No. 71 and 91. If each resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair VMV circuit short to VPWR. Clear PCM memory and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 33). No test procedures have been omitted.

33) Continuous Memory DTC P0443: Check VMV Circuit For Intermittent Failure Repeat QUICK TEST. If Continuous Memory DTC P0443 is still present, go to next step. If Continuous Memory DTC P0443 is not present, fault is intermittent and cannot be duplicated at this time. Testing is complete.

34) 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. 56 and test pins No. 71 and 91. Observe DVOM for indication of fault while shaking and bending VMV wiring harness and connector. A fault will be indicated by resistance measurement of less than 30 ohms or more than 36 ohms. Tap lightly on VMV to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z.

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

1. Crankshaft Position Sensor (CKP).
2. CKP wiring harness or connector.
3. Ignition Control Module (ICM).
4. ICM power or ground circuit.
5. Spark plug wires.

Ignition System Wiring Diagram. Scheme 36

1) Check Secondary Ignition Check spark plug, plug wires, coils and all connectors for damage, looseness or shorting. Repair or replace as necessary. If secondary ignition looks okay, go to next step.

2) Install EI Diagnostic Harness Turn ignition off. Install EI Diagnostic Harness (007-00059) to EEC-V Breakout Box (014-000950) and ICM. DO NOT connect CKP sensor tee or coil tee. Use EI (High Data Rate) 6 overlay. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Set diagnostic harness box type switch to "4/6" cylinder position. If vehicle will start and run, go to step 22). If vehicle will not start, go to next step.

3) Check PWR GND To ICM Turn ignition off. Measure resistance between breakout box test pins J7 (B-) and J27 (PWR GND). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open PWR GND circuit to ICM. Clear PCM memory and repeat QUICK TEST.

4) Check VPWR To ICM Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J51 (VPWR I). If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open VPWR circuit to ICM. Clear PCM memory and repeat QUICK TEST.

5) Check CKP+ At ICM Leave ignition on. Set DVOM to DC scale. Measure voltage between breakout box test pins J7 (B-) and J35 (CKP+ I). If DC voltage is 1.0-2.0 volts, go to step 11). If DC voltage is not 1.0-2.0 volts, go to next step.

6) Check CKP+ For Bias Fault Turn ignition off. Leave DVOM on DC scale. Disconnect CKP sensor wiring harness connector. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J35 (CKP+ I). If DC voltage is 1.0-2.0 volts, go to next step. If DC voltage is not 1.0-2.0 volts, go to step 19).

7) Check CKP- For Bias Fault Leave ignition on and DVOM on DC scale. Measure voltage between breakout box test pins J7 (B-) and J48 (CKP- I). If DC voltage is not 1.0-2.0 volts, go to next step. If DC voltage is 1.0-2.0 volts, replace CKP sensor. Clear PCM memory and repeat QUICK TEST.

8) Check Bias Fault If bias voltage reading in step 7) was less than 1.0 volt, go to next step. If bias voltage reading in step 7) was 1.0 volt or more, go to step 10).

9) Check CKP- Circuit For Short To Ground (Bias Low Fault) Turn ignition off. Disconnect ICM from ICM tee. Measure resistance between breakout box test pins J7 (B-) and J48 (CKP- I). If resistance is more than 10,000 ohms, replace ICM. Clear PCM memory and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair CKP- circuit short to ground. Clear PCM memory and repeat QUICK TEST.

10) Check CKP- Circuit For Short To Power (Bias High Fault) Turn ignition off. Disconnect ICM from ICM tee. Set DVOM on DC scale. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J48 (CKP- I). If voltage is less than 0.5 volt, replace ICM. Clear PCM memory and repeat QUICK TEST. If voltage is 0.5 volt or more, repair CKP- circuit short to power. Clear PCM memory and repeat QUICK TEST.

11) Check CKP Voltage At ICM Set DVOM on AC scale. While cranking engine, measure voltage between breakout box test pins J35 (CKP+ I) and J48 (CKP- I). If AC voltage is less than 0.4 volt, go to next step. If AC voltage is 0.4 volt or more, go to CIRCUIT TEST JC.

12) Leave DVOM on AC scale. Disconnect ICM from ICM tee. While cranking engine, measure voltage between breakout box test pins J35 (CKP+ I) and J48 (CKP- I). If AC voltage is less than 0.4 volt, go to next step. If AC voltage is 0.4 volt or more, replace ICM. Clear PCM memory and repeat QUICK TEST.

13) Check CKP Circuit Resistance Turn ignition off. Measure resistance between breakout box test pins J35 (CKP+ I) and J48 (CKP- I). If resistance is 2580-2700 ohms, go to step 17). If resistance is not 2580-2700 ohms, go to next step.

14) Check Resistance High Or Low If resistance is more than 2580 ohms (high), go to next step. If resistance is 2580 ohms or less, go to step 18).

15) Check CKP+ Circuit Open; High Fault Turn ignition off. Connect CKP sensor tee to CKP sensor and wiring harness connector. Measure resistance between breakout box test pins J31 (CKP+ S) and J35 (CKP+ I). If resistance is less than 2050 ohms, go to next step. If resistance is 2050 ohms or more, repair open CKP+ circuit. Clear PCM memory and repeat QUICK TEST.

16) Check CKP- Circuit Open; High Fault Turn ignition off. Measure resistance between breakout box test pins J32 (CKP- S) and J48 (CKP- I). If resistance is less than 2050 ohms, replace CKP sensor. Clear PCM memory and repeat QUICK TEST. If resistance is 2050 ohms or more, repair open CKP- circuit. Clear PCM memory and repeat QUICK TEST.

17) Check CKP Air Gap & Trigger Wheel Inspect CKP sensor and trigger wheel for damage or contamination. Repair or replace suspect components. If all components look okay, replace CKP sensor.

18) Check For CKP+ Short To CKP-; Low Fault Turn ignition off. Disconnect CKP sensor. Measure resistance between breakout box test pins J35 (CKP+ I) and J48 (CKP- I). If resistance is less than 3000 ohms, repair CKP+ circuit short to CKP- circuit. Clear PCM memory and repeat QUICK TEST. If resistance is 3000 ohms or more, replace CKP sensor. Clear PCM memory and repeat QUICK TEST.

19) Check Voltage High Or Low If voltage in step 6) is less than 1.0 volt (low), go to next step. If voltage in step 6) is 1.0 volt or more (high), go to step 21).

20) Check For CKP+ Short To Ground; Low Fault Turn ignition off. Disconnect ICM from ICM tee. Measure resistance between breakout box test pins J7 (B-) and J35 (CKP+ I). If resistance is more than 10,000 ohms, replace ICM. Clear PCM memory and repeat QUICK TEST. If resistance is 10,000 ohms or less, repair CKP+ circuit short to ground. Clear PCM memory and repeat QUICK TEST.

21) Check For CKP+ Short To Power; High Fault Leave ICM disconnected from ICM tee. Set DVOM on DC scale. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J35 (CKP+ I). If voltage is less than 0.5 volt, replace ICM. Clear PCM memory and repeat QUICK TEST. If voltage is 0.5 volt or more, repair CKP+ circuit short to power. Clear PCM memory and repeat QUICK TEST.

22) Check For CKP Circuit Resistance Leave ICM disconnected from ICM tee. Turn ignition off. Measure resistance between breakout box test pins J35 (CKP+ I) and J48 (CKP- I). If resistance is 2580-2750 ohms, replace ICM. Clear PCM memory and repeat QUICK TEST. If resistance is not 2580-2750 ohms, return to step 14).

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

1. Spark plugs.
2. Spark plug wires.

MISFIRE TROUBLE CODES

1) Check Possible Cause Of Misfire Connect engine oscilloscope to vehicle. View parade pattern of ignition secondary system. Go to next step.

Note. Vehicle operates multi-strike mode up to 1500 RPM.

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 CIRCUIT TEST HD, step 8).

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) 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) 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) 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) If average spark output voltage is 15,000 volts or less with spark output variation less than 5000 volts, testing is complete. Go to CIRCUIT TEST HD, step 8). If spark output voltage is not as specified, go to next step.

8) 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) 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) 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) 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.

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

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

1) DTC P1364, P1352, P1353 & P1354 Using a spark tester, check for spark at all spark plug wires while cranking engine. If consistent spark is present at all spark plug wires, system is okay and testing is complete. If consistent spark is not present, go to next step.

2) 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.

Note. (Scheme 36)for ignition system wiring diagram.

3) Check For COIL PWR At Coil Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Install coil tee. Use EI (High Data Rate) 6 overlay. 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 (VBATC) and J7 (B-). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in VBATC circuit. Clear PCM memory and repeat QUICK TEST.

4) Check C1C Circuit At Coil Pack Turn ignition on. Measure voltage 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 16).

5) Check C2C Circuit At Coil Pack Turn ignition on. Measure voltage 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 18).

6) Check C3C Circuit At Coil Pack Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J10 (C3C). If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, go to step 20).

7) Check C1I Circuit At ICM Turn ignition off. Connect ICM wiring harness connector to diagnostic harness ICM tee. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J53 (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.

8) Check C2I Circuit At ICM Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J55. If DC voltage is more than 10.0 volts, go to next step. If voltage is 10.0 volts or less, repair open in C2I circuit.

9) Check C3I Circuit At ICM Turn ignition off. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J54 (C3I). 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 C3I circuit.

10) Check C1C Circuit At Coil Turn ignition off. Disconnect coil from diagnostic harness coil tee. Turn ignition on. Measure voltage between breakout box test pins J6 (C1C) and J7 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 22).

11) Check C2C Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J3 (C2C) and J7 (B-). If DC voltage is less than 0.5 volt, go to next step. If DC voltage is 0.5 volt or more, go to step 23).

12) Check C3C Circuit At Coil Leave ignition on. Measure voltage between breakout box test pins J7 (B-) and J10 (C3C). 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 24).

13) 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 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 ICM. Clear PCM and repeat QUICK TEST.

14) Check C2C Circuit At Coil While Cranking Connect incandescent test light 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 ICM. Clear PCM and repeat QUICK TEST.

15) 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. Clear PCM memory and repeat QUICK TEST. If test light does not blink as indicated, replace ICM. Clear PCM and repeat QUICK TEST.

16) Check Coil No. 1 Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance 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.

17) Leave ignition off. Disconnect ICM wiring harness connector. Measure resistance 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 ICM. Clear PCM memory and repeat QUICK TEST.

18) Check Coil No. 2 Turn ignition off. Disconnect coil from diagnostic harness coil tee. Measure resistance 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.

19) Leave ignition off. Disconnect ICM wiring harness connector. Measure resistance between breakout box test pins J3 (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 ICM. Clear PCM memory and repeat QUICK TEST.

Note. If C2 circuit is shorted to ground, coil damage may occur.

20) Check Coil No. 3 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.

21) Leave ignition off. Disconnect ICM wiring harness connector. Measure resistance between breakout box test pins J7 (B-) and J10 (C3C). If resistance is less than 10,000 ohms, repair open in C3C circuit. If resistance is 10,000 ohms or more, replace ICM. Clear PCM memory and repeat QUICK TEST.

22) Check Coil No. 1 Turn ignition off. Disconnect ICM from diagnostic harness ICM tee. Turn ignition on. Measure voltage between breakout box test pins J6 (C1C) and J7 (B-). If DC voltage is less than 0.5 volt, replace ICM. Clear PCM memory and repeat QUICK TEST. If voltage is 0.5 volt or more, repair C1C circuit short to power. Clear PCM memory and repeat QUICK TEST.

23) Check Coil No. 2 Turn ignition off. Disconnect ICM from diagnostic harness ICM tee. Turn ignition on. Measure voltage between breakout box test pins J3 (C2C) and J7 (B-). If DC voltage is less than 0.5 volt, replace ICM. Clear PCM memory and repeat QUICK TEST. If voltage is 0.5 volt or more, repair C2 circuit short to power. Clear PCM memory and repeat QUICK TEST.

24) Check Coil No. 3 Turn ignition off. Disconnect ICM from diagnostic harness ICM tee. Turn ignition on. Measure voltage between breakout box test pins J7 (B-) and J10 (C3C). If DC voltage is less than 0.5 volt, replace ICM. Clear PCM memory and repeat QUICK TEST. If voltage is 0.5 volt or more, repair C3C circuit short to power. Clear PCM memory and repeat QUICK TEST.

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

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

Identifying Fuel System Test Circuit & Connector Terminals. Scheme 37

1) DTC P0230 Fuel pump primary circuit has been indicated. Possible causes are as follows

1. Open or shorted circuit.
2. Fatly fuel pump relay.
3. Fault PCM.

Disconnect fuel pump relay wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal at connector and chassis ground. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open in VPWR circuit between EEC power relay and fuel pump relay.

2) Check Fuel Pump Relay Turn ignition off. Leave fuel pump relay disconnected. Measure resistance between terminals No. 85 and 86 at fuel pump relay. Resistance should be 40-85 ohms. Measure resistance between terminal No. 85 and terminals No. 30 and 87 at fuel pump relay. Resistance should be more than 10,000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace fuel pump relay.

Identifying Fuel Pump Relay Terminals. Scheme 38

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.

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.

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, replace PCM and repeat QUICK TEST. If resistance is 5 ohms or less, repair open circuit and repeat QUICK TEST.

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.

10) DTC P0232 If engine starts, go to next step. If engine does not start, go to step 15).

11) Check Fuel Pump Turn ignition on. 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).

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. If fuel pump still does not operate, replace fuel pump relay and repeat QUICK TEST.

13) Check FPM Circuit Turn ignition off. Leave fuel pump relay disconnected. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 40 and POWER-TO PUMP circuit at fuel pump relay wiring harness connector. If resistance is less than 5 ohms, replace PCM and repeat QUICK TEST. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 15). No test procedures have been omitted.

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.

16) Leave IFS switch disconnected. Turn ignition on. Measure voltage between terminal POWER-TO-PUMP terminal and ground. If voltage is less than 5 volts, repair open in POWER-TO-PUMP circuit and repeat QUICK TEST. If voltage is 5 volts or more, check fuel pump and fuel pump ground circuit. Repair or replace as necessary.

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.

20) DTC P0231 If engine starts, replace PCM and repeat QUICK TEST. If engine does not start, go to next step.

21) Check B+ To Fuel Pump Relay Turn ignition off. Disconnect fuel pump relay wiring harness connector. Measure voltage between chassis ground and B+ terminal at wiring harness connector. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, check circuit fuse. If fuse is okay, repair open in B+ circuit and repeat QUICK TEST.

22) Check POWER-TO-PUMP Circuit Continuity Leave ignition off and fuel pump relay disconnected. Measure resistance between negative battery terminal and POWER-TO-PUMP terminal at wiring harness connector. If resistance is less than 10 ohms, replace fuel pump relay and repeat QUICK TEST. If resistance is 10 ohms or more, repair open in POWER-TO-PUMP circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 30). No test procedures have been omitted.

30) Continuous Memory DTC P0232 Turn ignition off. Connect scan tester to Data Link Connector. Using scan tester, access FRM PID. Observe PID for indication of fault while wiggling and bending POWER-TO-PUMP circuit between fuel pump relay and fuel pump. Fault will be indicated by FPM PID turning on. Wiggle and bend FPM circuit between PCM and POWER-TO-PUMP circuit splice. Wiggle and bend fuel pump ground circuit. fuel pump. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 30) to step 35). No test procedures have been omitted.

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 DVOM between test pins No. 40 (FPM) and 51 (GND). Voltage should be 10 volts or more. Observe DVOM for indication of fault while wiggling and bending B+ circuit to fuel pump relay. Fault will be indicated by sudden change in DVOM voltage. Wiggle and bend POWER-TO-PUMP circuit between fuel pump relay and FPM circuit splice. Lightly tap on fuel pump relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 40). No test procedures have been omitted.

40) Continuous Memory DTC P0230 Turn ignition off. Connect scan tester to Data Link Connector. Using scan tester, access FPA PID. Observe PID for indication of fault while wiggling and bending FUEL PUMP circuit between fuel pump relay and PCM. Fault will be indicated by FPA PID turning on. Wiggle and bend FPM circuit between PCM and POWER-TO-PUMP circuit splice. Wiggle and bend VPWR circuit between fuel pump relay and EEC-V power relay. Check connectors for clean tight connection. If any faults are found, isolate and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to CIRCUIT TEST Z.

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

1. Fuel pump driver module.
2. Inertia Fuel Shutoff (IFS) switch.
3. Wiring Harness Circuits (B+, FUEL PUMP, FPM, POWER-TO-PUMP and VPWR).
4. Constant Control Relay Module (CCRM).
5. Powertrain Control Module (PCM).

Fuel Pump Driver Module Test Circuit & Connector Terminals. Scheme 39

1) DTC P1233 Or P1234 Turn ignition off. Connect scan tester to Data Link Connector. Turn ignition on. Using scan tester, access FPM PID. If FPM PID is 20-80 percent, go to step 25). If FPM PID is not 20-80 percent, go to next step.

2) If engine will start, go to step 15). If engine will not start, verify IFS switch is set and go to next step.

3) Turn ignition off. Disconnect FPDM wiring harness connector. Turn ignition on. Measure voltage between connector terminals GND and POWER-TO-FPDM. If voltage is 10.5 volts or more, replace FPDM and repeat QUICK TEST. If voltage is less than 10.5 volts, go to step 7).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 7). No test procedures have been omitted.

7) Leave ignition on and FPDM disconnected. Measure voltage between chassis ground and connector terminal POWER-TO-FPDM. If voltage is 10.5 volts or more, repair open circuit and repeat QUICK TEST. If voltage is less than 10.5 volts, go to next step.

8) Turn ignition off. Leave FPDM disconnected. Disconnect CCRM. Measure voltage between chassis ground and terminal No. 11 (B+) of CCRM connector. If voltage is less than 10.5 volts, repair open circuit to CCRM and repeat QUICK TEST. If voltage is 10.5 volts or more, to next step.

9) Turn ignition off. Leave FPDM and CCRM disconnected. Disconnect scan tester (if applicable). Measure resistance between negative battery terminal and terminal No. 8 (GND) of CCRM connector. If resistance is 5 ohms or more, repair open circuit to CCRM and repeat QUICK TEST. If resistance is less than 5 ohms, go to next step.

10) Leave ignition off. Leave FPDM and CCRM disconnected. Measure resistance between POWER-TO-FPDM terminal of FPDM connector and terminal No. 5 of CCRM connector. If resistance is 5 ohms or more, go to step 13). If resistance is less than 5 ohms, reconnect FPDM and go to next step.

11) Leave ignition off. Leave CCRM disconnected. Disconnect EEC-V power relay. Measure resistance between VPWR terminal of EEC-V power relay connector and terminal No. 13 (VPWR) of CCRM connector. If resistance is 5 ohms or less, replace CCRM and repeat QUICK TEST. If resistance is more than 5 ohms, repair open in VPWR circuit between EEC-V power relay and CCRM.

Identifying EEC-V Power Relay Connector Terminals. Scheme 40

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 13). No test procedures have been omitted.

13) Leave ignition off. Leave CCRM and FPDM disconnected. Disconnect IFS switch. Measure resistance between POWER-TO-FPDM terminal of IFS switch connector and terminal No. 5 of CCRM connector. Measure resistance between POWER-TO-FPDM terminal of FPDM connector and POWER-TO-FPDM terminal of IFS switch connector. If resistance is 5 ohms or less, replace IFS switch and repeat QUICK TEST. If resistance is more than 5 ohms, repair open circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 15). No test procedures have been omitted.

15) Turn ignition off. Disconnect FPDM wiring harness connector. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 40 (FPM) at breakout box and FPM terminal of FPDM connector. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in FPM circuit and repeat QUICK TEST.

16) Leave FPDM disconnected. Turn ignition on. Measure voltage between test pin No. 40 and 51 (PWR GND) at breakout box. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair FPM circuit short to power and repeat QUICK TEST.

17) Leave FPDM disconnected. Turn ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 40 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair circuit short to ground and repeat QUICK TEST.

18) Reconnect FPDM. Turn ignition on. Measure voltage between test pins No. 40 and 76 (PWR GND) at breakout box. If voltage is 0.2-1.0 volt, replace PCM and repeat QUICK TEST. If voltage is not 0.2-1.0 volt, replace FPDM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 25). No test procedures have been omitted.

25) Check For Intermittent Short Or Open Circuit Scan tester should be connected to DLC and in FPM PID. Observe FPM PID for indication of fault while lightly tapping on CCRM, FPDM and IFS switch. Fault will be indicated if FPM PID goes outside 20-80 percent range. Wiggle and bend all FPDM system related wiring harness and connectors. If any faults are found, isolate and repair as necessary. Repeat QUICK TEST. If no faults are found, problem cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 25) to step 30). No test procedures have been omitted.

30) DTC P0230, P1235 Or P1236 Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access FPM PID. If FPM PID is not 20-80 percent, go to step 40). If FPM PID is 20-80 percent, go to next step.

31) Turn ignition off. Disconnect FPDM wiring harness connector. Disconnect PCM wiring harness connector. Inspect pins for damage and repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 80 (FP) at breakout box and FP terminal of FPDM connector. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in FP circuit and repeat QUICK TEST.

32) Leave FPDM disconnected. Turn ignition on. Measure voltage between test pin No. 51 (PWR GND) and 80 (FP) at breakout box. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair FP circuit short to power and repeat QUICK TEST.

33) Leave FPDM disconnected. Turn ignition off. Disconnect scan tester from DLC (if applicable). Measure resistance between test pin No. 80 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair circuit short to ground and repeat QUICK TEST.

34) Reconnect FPDM. Turn ignition on. Measure voltage between test pin No. 51 (PWR GND) and 80 at breakout box. If voltage is 4.5-5.5 volts, replace PCM and repeat QUICK TEST. If voltage is not 4.5-5.5 volts, replace FPDM and repeat QUICK TEST.

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.

40) Check For Intermittent Short Or Open Circuit Scan tester should be connected to DLC and in FPM PID. Observe FPM PID for indication of fault while lightly tapping on CCRM, FPDM and IFS switch. Fault will be indicated if FPM PID goes outside 20-80 percent range. Wiggle and bend all FPDM system related wiring harness and connectors. If any faults are found, isolate and repair as necessary. Repeat QUICK TEST. If no faults are found, problem cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 40) to step 47). No test procedures have been omitted.

47) DTC P1237 Or P1238 Turn ignition off. Connect scan tester to Data Link Connector. Turn ignition on. Using scan tester, access FPM PID. If FPM PID is 70-80 percent, go to next step. If FPM PID is not 70-80 percent, go to step 57).

48) If engine will start, go to step 62). If engine will not start, go to next step.

49) Turn ignition off. Disconnect scan tester (if applicable). Disconnect FPDM wiring harness connector. Measure resistance between FPDM connector terminals FUEL PUMP GROUND and POWER-TO-PUMP. If resistance is 10 ohms or more, go to step 54). If resistance is less than 10 ohms, go to next step.

50) Leave FPDM disconnected. Turn ignition on. Measure voltage between chassis ground and FUEL PUMP GROUND terminal at FPDM connector. If voltage is one volt or more, repair circuit short to power and repeat QUICK TEST. If voltage is less than one volt, go to next step.

51) Turn ignition off. Disconnect fuel pump wiring harness connector. Measure resistance between negative battery terminal and POWER-TO-PUMP terminal at FPDM connector. 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 and repeat QUICK TEST.

52) Check For Power To Fuel Pump Turn ignition off. Leave fuel pump disconnected. Reconnect FPDM. Turn ignition on. Measure voltage between fuel pump terminals at connector. Turn ignition off. If voltage is 10 volts or more, replace fuel pump and repeat QUICK TEST. If voltage is less than 10 volts, verify battery is full charged. If battery is okay, replace FPDM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 54). No test procedures have been omitted.

54) Isolate Open Circuit Turn ignition off. Disconnect FPDM. Measure resistance of POWER-TO-PUMP circuit between fuel pump and FPDM connector. Measure resistance of FUEL PUMP GROUND circuit between fuel pump and FPDM connector. Measure internal resistance of fuel pump. If each resistance measurement is less than 10 ohms, no faults are present. Verify results of previous steps. If any resistance measurement is 10 ohms or more, repair open circuit or replace fuel pump. Repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 54) to step 57). No test procedures have been omitted.

57) Check Fuel Pump Secondary Circuit Leave ignition on. Using scan tester, access Output Test Mode. Command outputs on (to activate fuel pump). Listen for fuel pump to activate. Listen to fuel pump for indication of fault while lightly tapping on fuel pump and FPDM. Fault will be indicated if fuel pump shuts off. Wiggle and bend POWER-TO-PUMP and FUEL PUMP GROUND circuit between fuel pump and FPDM. If any faults are found, isolate and repair as necessary. Repeat QUICK TEST. If no faults are found, problem cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 57) to step 62). No test procedures have been omitted.

62) Check FPDM Turn ignition off. Disconnect FPDM. Turn ignition on. Listen for fuel pump to activate. If fuel pump activates, repair POWER-TO-PUMP circuit short to power. If fuel pump does not activate, replace FPDM.

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

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

Identifying IAC Circuit & Connector Terminals. Scheme 41

1) Perform KOER self-test. If DTC P0505 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) DTC P0505 indicates that IAC system malfunction has been detected. DTC P1507 indicates that IAC system underspeed fault has been detected. Possible causes are as follows

1. IAC circuit open or shorted to PWR.
2. VPWR circuit open.
3. Contaminated IAC valve assembly.
4. Damaged throttle body.
5. 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.

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.

4) Check IAC Solenoid Internal Short To Case Turn ignition off. Measure resistance between each wiring harness connector terminal and IAC housing. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace IAC solenoid assembly and repeat QUICK TEST.

5) 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. If resistance is less than 5 ohms, go to next step.

6) 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. If voltage is less than one volt, go to next step.

7) 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.

8) 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 pins 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. If voltage is not 3.0-11.5 volts, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 10). No test procedures have been omitted.

10) DTC P1506 This code indicates that IAC system has reached overspeed malfunction. Possible causes are as follows

1. IAC circuit short to ground.
2. IAC assembly stuck open.
3. Air intake leaks or restrictions.
4. Damaged throttle body.
5. Contaminated or damaged IAC valve assembly.
6. 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.

11) Check IAC Solenoid Function Start engine and allow to idle. Ensure transmission is in Park or Neutral. 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.

12) Check IAC Circuit For Short To Ground 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. 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, replace PCM and repeat QUICK TEST. If resistance is less than 10,000 ohms, repair circuit short to ground and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 15). No test procedures have been omitted.

15) DTC P1505; Check Inlet Air Supply DTC P1505 indicates that IAC system has reached the adaptive learning limit. Possible causes are as follows

1. Air intake leaks or restrictions.
2. Throttle body linkage binding.
3. Contaminated or damaged IAC valve assembly.
4. 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) Check Air Filter Turn ignition off. Remove air filter and inspect for excessive dirt or contamination. Repair or replace as necessary and repeat QUICK TEST. If air filter is okay, go to next step.

17) 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 CIRCUIT TEST HU, step 3). If no faults are present, go to CIRCUIT TEST HU, step 8).

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.

20) Continuous DTC P1506: Monitor IAC Duty Cycle Connect scan tester to DLC. 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 increase in engine speed and decrease in duty cycle. If any faults are found, isolate and repair as necessary. Repeat QUICK TEST. If no faults are found, problem cannot be duplicated at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 30). No test procedures have been omitted.

30) Continuous DTC P1507: Monitor IAC Duty Cycle Connect scan tester to DLC. Turn ignition on. Access IAC PID, RPM PID and TP 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 increase in engine speed and decrease in duty cycle. If any faults are found, isolate and repair as necessary. Repeat QUICK TEST. If no faults are found, problem cannot be duplicated at this time. Go to CIRCUIT TEST Z.

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

1. Wiring harness circuits (B+, FC, POWER-TO-FAN and VPWR).
2. Faulty fan control relay.
3. Faulty PCM.

Fan Control Relay Test Circuits & Connector Terminals. Scheme 42

1) DTC P1474: Check VPWR Circuit Disconnect fan control relay wiring harness connector. Turn ignition on. Measure voltage between VPWR terminal of connector and negative battery terminal. If voltage is less than 10.5 volts, repair open in VPWR circuit to fan control relay and repeat QUICK TEST. If voltage is 10.5 volts or more, go to next step.

2) Turn ignition off. Leave fan control relay disconnected. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access Output Test Mode (OTM). Connect positive lead of DVOM to VPWR terminal of relay connector. Connect negative lead to FC terminal. While observing DVOM, command cooling fan on and off. If voltage changes 0.5 volt or more as cooling fan is commanded on and off, replace fan control relay and repeat QUICK TEST. If voltage does not change as specified, go to next step.

3) Check FC Circuit Turn ignition off. Leave fan control relay disconnected. Disconnect PCM wiring harness connector. Inspect connector for damage or corrosion and repair as necessary. Turn ignition on. Measure voltage between FC terminal of connector and negative battery terminal. If voltage is one volt or more, repair FC circuit short to power and repeat QUICK TEST. If voltage is less than one volt, go to next step.

4) Turn ignition off. Leave fan control relay disconnected. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 28 (FC) 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.

5) Check FC Circuit Continuity Leave ignition off and relay disconnected. Measure resistance between breakout box test pin No. 28 and FC terminal at fan control relay connector. If resistance is 5 ohms or more, repair open in FC circuit and repeat QUICK TEST. If resistance is less than 5 ohms, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 30). No test procedures have been omitted.

30) Continuous Memory DTC P1474 Turn ignition off. Connect scan tester to Data Link Connector. Turn ignition on. Using scan tester, access LFCA PID. Scan tester should show LFCA PID off. Observe LFCA PID for indication of fault while wiggling and bending FC circuit between fan control relay and PCM. Fault will be indicated by LFCA PID turning on. Wiggle and bend VPWR circuit between EEC-V power relay and fan control relay. Lightly tap on fan control 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.

31) Disconnect fan control relay. LFCA PID should be on. Observe LFCA PID for indication of fault while wiggling and bending FC circuit between fan control relay and PCM. Fault will be indicated by LFCA PID turning off. 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.

CIRCUIT TEST MB - OUTPUT STATE DIAGNOSTIC TEST MODE

NOT FUNCTIONING

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) 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) Check connector and wiring harness cable between scan tester and battery power supply for correct installation, damage or poor connection. Repair as necessary. Ensure correct key sequence for outputs is executed. See scan tester manufacturer instructions.

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

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

Note. (Scheme 36)for ignition system wiring diagram.

1) DTC 1359: Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

2) Check Base Timing Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. Install coil tee. Use EI (High Data Rate) 6 overlay. Set diagnostic harness box type switch to "4/6" cylinder position. Connect diagnostic harness negative lead to battery negative terminal. Leave positive lead disconnected. Start engine and check base timing. If base timing is 8-12 degrees BTDC, go to next step. If base timing is not 8-12 degrees BTDC, go to step 9).

3) Check Spark Advance Turn ignition off. Ensure SPOUT is connected. Start engine and check timing. If timing is more than 15 degrees BTDC, ignition system is okay and testing is complete. If timing is less than 15 degrees BTDC, go to next step.

4) Check SPOUT Circuit At ICM Start engine and allow to idle. Set DVOM on AC scale. Measure voltage between test pins J7 (B-) and J21. If AC voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, replace ICM. Clear PCM memory and repeat QUICK TEST.

5) Turn ignition off. Push down and hold SPOUT button of diagnostic harness. Start engine and allow to idle. Measure voltage between test pins J7 (B-) and J21. If AC voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, replace ICM. Clear PCM memory and repeat QUICK TEST.

6) Check SPOUT Circuit Turn ignition off. Set DVOM on DC scale. Disconnect PCM. Disconnect ICM tee of diagnostic harness from ICM. Turn ignition on. Measure voltage between test pins J7 (B-) and J45 (SPOUT). If DC voltage is 0.5 volt or less, go to next step. If voltage is more than 0.5 volt, repair SPOUT circuit short to power. Clear PCM memory and repeat QUICK TEST.

Note. When PCM is disconnected, continuous memory will be erased and a DTC P1000 will be set.

7) Check SPOUT Circuit Turn ignition off. Disconnect diagnostic harness positive lead from battery. Measure resistance between test pins J7 (B-) and J45 (SPOUT). If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair SPOUT circuit short to ground. Clear PCM memory and repeat QUICK TEST.

8) Check SPOUT Circuit Leave ignition off. Install a second breakout box. Measure resistance between test pins J45 (SPOUT) at the first breakout box and test pin No. 50 at the second breakout box. If resistance is less than 5 ohms, replace PCM. Clear PCM memory and repeat QUICK TEST. If resistance is 5 ohms or more, repair open in SPOUT circuit. Clear PCM memory and repeat QUICK TEST.

9) Inspect Crankshaft Position (CKP) Sensor & Timing Wheel Leave ignition off. Visually inspect CKP sensor and trigger wheel for damage, loose connections or incorrect installation. Repair or replace as necessary. Clear PCM memory and repeat QUICK TEST. If CKP sensor and trigger wheel are okay, replace ICM. Clear PCM memory and repeat QUICK TEST.

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

1. Wiring harness circuits (IDM, PWR GND & VPWR).
2. Faulty ICM.
3. Faulty PCM.

Note. (Scheme 36)for ignition system wiring diagram.

1) 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 start and none of the specified causes were present, go to step 3). If vehicle will not start, go to CIRCUIT TEST A.

2) Continuous Memory DTC P1351 This code indicates a loss of IDM input to the PCM. Possible causes are as follows

1. Open or shorted circuit.
2. Faulty ICM.
3. Faulty PCM.

If vehicle will not start or Continuous Memory DTCs P1350, P1351, P1352, P1353 or P1354 are present, go to CIRCUIT TEST JC. For all other vehicles, go to next step.

3) Check For IDM At ICM Turn ignition off. Install EI Diagnostic Harness (007-00059) to Breakout Box (014-000950) and ICM. DO NOT connect coil tee or Crankshaft Position (CKP) sensor tee. Use EI (High Data Rate) 6 overlay. Set diagnostic harness box type switch to "4/6" cylinder position. Connect diagnostic harness negative lead and positive lead to battery. Set DVOM on AC voltage scale. Start engine. Measure voltage between test pins J7 (B-) and J30. If AC voltage is 5-7 volts, go to next step. If AC voltage is not 5-7 volts, go to step 5).

4) Check IDM Circuit Turn ignition off. Disconnect PCM. Disconnect ICM tee of diagnostic harness from ICM. Install a second breakout box to PCM wiring harness connector. Measure resistance between test pins J41 at the first breakout box and test pin No. 48 at the second breakout box. If resistance is less than 5 ohms, replace PCM. Clear PCM memory and repeat QUICK TEST. If resistance is 5 ohms or more, repair open in IDM circuit. Clear PCM memory and repeat QUICK TEST.

5) Turn ignition off. Push down and hold IDM button of diagnostic harness. Set DVOM on AC voltage scale. Start engine and allow to idle. Measure voltage between test pins J7 (B-) and J30. If AC voltage is 5 volts or more, go to next step. If voltage is less than 5 volts, replace ICM. Clear PCM memory and repeat QUICK TEST.

6) Turn ignition off. Leave DVOM on AC voltage scale. Crank engine while measuring voltage between test pins J7 (B-) and J30. If AC voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, replace PCM and repeat QUICK TEST.

7) Turn ignition off. Set DVOM on DC voltage scale. Disconnect ICM from ICM tee. Turn ignition on. Measure voltage between test pins J7 (B-) and J41 (IDM). If DC voltage is 0.5 volt or less, go to next step. If voltage is more than 0.5 volt, repair IDM short to power. Clear PCM memory and repeat QUICK TEST.

8) Turn ignition off. Measure resistance between test pins J7 (B-) and J41 (IDM). If resistance is 10,000 ohms or less, repair IDM short to ground. Clear PCM memory and repeat QUICK TEST. If resistance is more than 10,000 ohms, isolate and repair IDM circuit short to another circuit located between ICM and PCM. Clear PCM memory and repeat QUICK TEST.

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

1. Wiring harness circuit (MIL).
2. Faulty PCM.

MIL Circuit Schematic. Scheme 43

1) MIL Always On Perform KOEO self-test. 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 (014-00959), leaving PCM disconnected. Measure and record resistance between test pins No. 2 and No. 51 of 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) 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) 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) 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) 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.

1) DTC P1270 This DTC indicates that engine or vehicle speed has exceeded calibrated limit. Possible causes are as follows

1. Wheel slippage caused by mud, ice, water, snow, etc.
2. Over revved engine.
3. Vehicle driven at excessive rate of speed.

If any of the specified causes have occurred, system is okay. Clear PCM memory. If none of specified causes have occurred, clear PCM memory. If no other faults are present, testing is complete.

CIRCUIT TEST QA - UNABLE TO ACTIVATE SELF-TEST/SCP

COMMUNICATION ERROR CODE NOT LISTED

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

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

Data Link Connector (DLC) Test Circuit/Connector Terminals. Scheme 44

1) Verify Self-Test Procedure Is Correct Ensure scan tester is correctly attached to DLC located under dash panel. DO NOT use DLC located in engine compartment. Ensure correct self-test procedure is used. Correct as necessary. If correct procedures were used, go to next step.

2) Check For VREF At TP Sensor Turn ignition off. Disconnect TP sensor. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

Note. KOER self-test failure or Communication Error message could result if a failure is present in MAF sensor, MLP sensor, VSS or related circuits.

3) Ability To Access Continuous Memory DTCs If Continuous Memory DTCs were accessible, go to next step. If Continuous Memory DTCs were not accessible, go to step 8).

4) Ability To Activate KOEO Self-Test If KOEO self-test was entered, go to next step. If KOEO self-test was not entered, go to step 8).

5) Ability To Activate KOER Self-Test If KOER self-test was entered, DTC is false. Obtain PCM part number and check manufacturer for correct PCM application. If KOER self-test was not entered, go to next step.

6) Check Engine Idle Speed KOER self-test cannot be entered if engine speed is too high or too low. Turn ignition off. Ensure all accessories are off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access RPM PID. Check engine idle speed. If idle speed is okay, go to next step. If idle speed is not okay, go to CIRCUIT TEST HU.

7) Perform QUICK TEST. If any trouble codes are present, service as necessary before continuing. If unable to retrieve trouble codes, go to next step.

8) Check For Voltage At Data Link Connector (DLC) Inspect DLC for damage and repair as necessary. Turn ignition on. Measure voltage between B+ terminal of DLC and engine ground. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open in B+ circuit and repeat QUICK TEST.

9) Check DLC Ground Circuit Continuity Turn ignition off. Measure resistance between CHASSIS GROUND terminal of DLC and engine ground. If less than 5 ohms are present, go to next step. If 5 ohms or more are present, repair open in CHASSIS GROUND circuit and repeat QUICK TEST.

10) Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 51 and 103 (PWR GND) at the breakout box and PWR GND terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit to DLC and repeat QUICK TEST.

11) Check BUS(-) Circuit Leave ignition off. Measure resistance between test pin No. 15 (BUS-) at the breakout box and BUS(-) terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in BUS(-) circuit to DLC and repeat QUICK TEST.

12) Leave ignition off. Measure resistance between test pin No. 15 at the breakout box and engine ground. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair short to ground in BUS(-) circuit and repeat QUICK TEST.

13) Turn ignition on. Measure voltage between test pin No. 15 and test pins No. 51 and 103 (PWR GND) at the breakout box and engine ground. If voltage is less than 1.0 volt, go to next step. If voltage is 1.0 volt or more, repair short to power in BUS(-) circuit and repeat QUICK TEST.

14) Check BUS(+) Circuit Leave ignition off. Measure resistance between test pin No. 16 (BUS+) at the breakout box and BUS(+) terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in BUS(+) circuit to DLC and repeat QUICK TEST.

15) Turn ignition on. Measure voltage between engine ground and test pins No. 16, 51 and 103 (PWR GND) at the breakout box. If voltage is less than 1.0 volt, replace PCM. If voltage is 1.0 volt or more, repair short to power in BUS(+) circuit and repeat QUICK TEST.

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

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

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

Keep Alive Power (KAPWR) Circuit Schematic. Scheme 45

1) DTC P0603 & P1605: Check Battery Terminals Inspect battery terminals for corrosion or loose connection. Service or replace as necessary. If battery terminals are okay, go to next step.

2) Check Wiring Harness Inspect wiring harness and connectors for damage or corrosion. Ensure wiring harness is not improperly routed too close to ignition or exhaust components. Service or replace as necessary. If wiring harness looks okay, go to next step.

3) Check KAPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Connect DVOM between test pin No. 55 (KAPWR) and test pins No. 51 and 103 (PWR GND) at breakout box. Shake and bend small sections of wiring harness between PCM and dash panel. If DVOM continuously indicates 10.5 volts or more, go to next step. If DVOM indicates voltage drops to less than 10.5 volts, isolate open in KAPWR circuit and repair as necessary. Repeat QUICK TEST.

4) Check For DTC P0603 Or P1605 Perform KOEO self-test. If DTC P0603 or P1605 is present, replace PCM and repeat QUICK TEST. If any other DTCs are present, service as necessary. If no trouble codes are present, testing is complete.

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

A drive cycle consists of vehicle warmed to normal engine temperature and operating in all speed ranges. After all monitors test successfully, SYSTEM PASS can be retrieved from PCM.

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

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

1) Check For Other DTCs If any trouble codes are present, service as necessary. If no trouble codes are present, go to next step.

2) Test drive vehicle to complete drive cycle. Cruise at 20-45 MPH for at least 4 minutes. Cruise at 30-40 MPH for at least 60 seconds. Cruise at 40-65 MPH for at least 80 seconds. If DTC P1000 is still present, go to next step. If DTC P1000 is not present, testing is complete.

3) Turn ignition off. Connect scan tester to Data Link Connector (DLC). Using scan tester, access VSS PID. Test drive vehicle to complete drive cycle. If VSS PID is more than zero, go to next step. If VSS PID is zero, repair open in VSS circuit and repeat QUICK TEST.

4) Ensure engine is at operating temperature. Using scan tester, access ECT PID. If ECT PID is more than 180°F (82°C), repeat drive cycle. If ECT PID is less than 180°F (82°C), repair cooling system fault and repeat QUICK TEST.

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

1) Check For Other DTCs If any other DTCs are present, service as necessary. If no DTCs other than P1260 are present, go to next step.

2) Disarm anti-theft system. Clear PCM memory. Start engine. If engine starts, testing is complete. If engine does not start, go to next step.

3) Perform QUICK TEST. If DTC P1260 is still present, fault is in anti-theft system.

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

1. Wiring harness circuits (CPP and SIG RTN).
2. Faulty Clutch Pedal Position (CPP) switch.
3. Faulty Powertrain Control Module (PCM).

Identifying CPP Switch Test Circuit & Connector Terminals. Scheme 46

1) DTC P0704 & P1709: Check CPP Switch Function These DTCs indicates CPP switch malfunction. Possible causes are as follows

1. Starter relay disconnected during KOER self-test.
2. CPP switch circuit damage.
3. Faulty CPP switch.
4. Faulty Powertrain Control Module (PCM).

Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Using scan tester, access PNP PID. While observing PNP PID, apply and release clutch pedal. If PNP PID does not cycle on and off, go to next step. If PNP PID cycles on and off, check PCM connector. If connector is okay, replace PCM.

2) Check CPP Switch Turn ignition off. Locate CPP switch near clutch pedal. Inspect switch and bracket for damage and repair if necessary. Disconnect CPP switch wiring harness connector. Measure resistance at switch terminals. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace CPP switch and repeat QUICK TEST.

3) Check CPP Circuit Turn ignition off. Disconnect scan tester. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Measure resistance between test pin No. 64 (CPP) at breakout box and CPP terminal at CPP switch 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.

4) Leave ignition off and CPP switch disconnected. Measure resistance between chassis ground and test pins No. 64 and 91 (SIG RTN) at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If resistance is 10,000 ohms or more, repair short circuit and repeat QUICK TEST.

CIRCUIT TEST TB - TRANSMISSION CONTROL SWITCH (TCS)/

TRANSMISSION CONTROL INDICATOR LAMP (TCIL)

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

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

TCIL & TCS Circuit Schematic. Scheme 47

1) DTC P1780 This code indicates that TCS was not cycled during KOER self-test. Possible causes are as follows

1. TCS not cycled during KOER self-test.
2. TCS circuit damage.
3. Faulty TCS.
4. Faulty PCM.

Repeat KOER self-test if TCS was not cycled in original test. If TCS was cycled during KOER self-test, go to next step.

2) Check TCS Circuit Voltage Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 29 (TCS) and test pins No. 24 and 77 (PWR GND) at breakout box while cycling TCS. If voltmeter reading does not cycle when TCS is cycled, go to next step. If voltmeter reading cycles when TCS is cycled, replace PCM and repeat QUICK TEST.

3) Check Circuit For Short To Ground Turn ignition off. Disconnect TCS. Inspect pins for damage and repair if necessary. Measure resistance between breakout box test pin No. 29 (TCS) and test pins No. 24 and 77 (PWR GND). If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

4) Check Continuity Of TCS Circuits Leave ignition off. Connect ohmmeter positive lead to TCS keypower at the fuse panel. Connect negative lead to power terminal of TCS 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.

5) Check Circuit For Short To Power Leave ignition off. Measure resistance between breakout box test pin No. 29 (TCS) and test pins No. 71 and 97 (VPWR). If resistance is 10,000 ohms or more, replace TCS switch and repeat QUICK TEST. If resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

6) TCIL Always On Turn ignition on. Cycle TCS. If TCIL does not cycle on and off, go to next step. If TCIL cycles on and off, fault is intermittent. Go to CIRCUIT TEST Z.

7) Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Turn ignition on. If TCIL goes off, replace PCM. If TCIL remains on, repair TCIL circuit short to ground.

8) TCIL Will Not Turn On Perform KOER self-test. If DTC 1780 is not present, go to next step. If DTC 1780 is present, go to step 1).

9) 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. Turn ignition on. Measure voltage between test pin No. 79 (TCIL) and test pins No. 24 and 76 (PWR GND) at breakout box. If voltage is 2 volts or more, replace PCM. If voltage is less than 2 volts, check indicator bulb and fuse. If bulb and fuse are okay, repair open circuit between test pin No. 79 and ignition switch.

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

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

Transmission Circuit & Connector Terminals. Scheme 48

TRANSMISSION SOLENOID IDENTIFICATION

1) DTC P0731/P0781, P0732/P0782, P0733/P0783, P0734/P0784, P0750, P0751, P0755, P0756, P0760, P0761, P1751, P1756 & P1761 These codes indicate transmission mechanical failure or electrical malfunction. Probable causes are as follows

1. Internal transmission damage.
2. Shift solenoid damage.
3. Shift solenoid circuit damage.
4. Faulty PCM.

Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between VPWR terminal and suspect shift solenoid terminal at transmission wiring harness connector. Repeat KOEO self-test. If DVOM voltage reading cycles, fault is internal transmission damage. If DVOM voltage reading does not cycle, go to next step.

2) Check VPWR Circuit At Solenoid Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 and 97 (VPWR) at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat QUICK TEST.

3) Leave transmission wiring harness connector disconnected. Turn ignition off. Measure and record resistance between VPWR terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST.

4) Leave ignition off and transmission wiring harness connector disconnected. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 51, 76 and 91 at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST. If all resistance measurements are 10,000 ohms or more, fault is internal transmission damage.

5) DTC P0741, P0743, P0746, P1746, P1747, P1749 & P1754 These codes indicate transmission electrical malfunction. Probable causes are as follows

1. Internal transmission damage.
2. Shift solenoid damage.
3. Shift solenoid circuit damage.
4. Faulty PCM.

Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between VPWR terminal and suspect shift solenoid terminal at transmission wiring harness connector. Connect scan tester to Data Link Connector (DLC). Using scan tester, activate scan tester Output Test Mode. Cycle suspect solenoid on and off. If DVOM voltage reading cycles, fault is inside transmission. Circuit testing is complete. If DVOM voltage reading does not cycle, go to next step.

6) Check VPWR Circuit At Solenoid Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 and 97 (VPWR) at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat QUICK TEST.

7) Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect scan tester. Measure and record resistance between VPWR terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST.

8) Leave ignition off and transmission wiring harness connector disconnected. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 51, 76 and 91 at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST. If all resistance measurements are 10,000 ohms or more, fault is internal transmission damage.

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

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

Transmission Range (TR) Sensor Schematic. Scheme 49

Identifying TR Test Circuit & Connector Terminals. Scheme 50

TR SENSOR SPECIFICATIONS

1) DTC P0707, P0708, P0736, P1701 & P1705 Probable causes for these codes are as follows

1. Misadjusted linkage.
2. Misaligned TR sensor.
3. TR sensor open or shorted circuit.

Turn ignition off. Ensure parking brake is applied. Place TR in Neutral. Place TR Sensor Gauge (T92P-7010-AH) in TR sensor adjustment slot and go to next step. If gauge does not fit in slot, loosen TR sensor mounting screws and move sensor until gauge fits in slot. Tighten screws and verify shift linkage is properly adjusted. Repeat QUICK TEST.

2) Remove sensor adjustment gauge. Connect scan tester to DLC. Turn ignition on. Using scan tester, access TR PID and TR-M PID. Voltage reading should be stable. Place gear shift lever in Park position. Tap on TR sensor while monitoring PID voltage for fault. Fault will be indicated by change in PID voltage. Shake and bend sections of wiring harness between TR sensor and PCM. If no faults are indicated, go to next step. If faults are indicated, go to step 4).

3) Check TR Sensor Voltage Turn ignition on. Using scan tester, access TR PID and TR-M PID. Voltage reading should be 4.23-4.68 volts in Park position. Cycle shift lever through complete gear range. Voltage should be within specification. See TR SENSOR SPECIFICATIONS table. If each voltage measurement is within specification, fault is internal transmission damage. If any voltage measurement is not within specification, go to next step.

4) Check Continuity Of TR Circuits Turn ignition off. Disconnect scan tester. Disconnect TR sensor wiring harness connector. Disconnect PCM 104-pin connector. Inspect terminals for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Measure resistance between test pin No. 64 (TR) at breakout box and TR terminal of TR sensor wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of TR sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST.

5) Leave ignition off and TR sensor disconnected. Measure resistance between test pin No. 64 (TR) and test pins No. 71, 76, 77, 91 and 97 at breakout box. Measure resistance between test pin No. 64 and chassis ground. If all resistance measurements are 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST.

6) Check TR Sensor Resistance Leave ignition off. Reconnect TR sensor. Unlock steering column. Measure resistance between breakout box test pins No. 64 and 91 in each gear range. Resistance should be within specification. See TR SENSOR SPECIFICATIONS table. If each resistance measurement is within specification, fault is internal transmission damage. If any resistance measurement is not within specification, replace TR sensor and repeat QUICK TEST.

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

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

Identifying Transmission Test Circuit & Connector Terminals. Scheme 51

TFT SENSOR SPECIFICATIONS (1)

1) DTC P0712 This code indicates that self-test has detected TFT sensor circuit input below specification. Possible causes for this code are as follows

1. Fluid level out of specification.
2. Short circuit in wiring harness.
3. Faulty TFT sensor.
4. Faulty PCM.

Turn ignition off. Disconnect transmission wiring harness connector. Perform KOEO and KOER self-test. If DTC P0713 is present, replace TFT sensor. If DTC P0713 is not present, go to next step.

2) Check VREF At TP Sensor Turn ignition off. Leave transmission connector disconnected. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at connecter. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

3) Check For Short In TFT Circuit Leave ignition off and transmission connector disconnected. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Measure resistance between test pins No. 37 (TFT) and test pins No. 91 (SIG RTN), 51 and 103 (PWR GND). If any resistance measurement is 10,000 ohms or less, repair short circuit and repeat QUICK TEST. If any resistance measurement is more than 10,000 ohms, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 10). No test procedures have been omitted.

10) DTC P0713 This code indicates that self-test has detected TFT sensor circuit input above specification. Possible causes for this code are as follows

1. Fluid level out of specification.
2. Short between TFT and VPWR circuits.
3. Open in TFT or SIG RTN circuit.
4. Faulty TFT sensor.
5. Faulty PCM.

Turn ignition off. Disconnect transmission wiring harness connector. Install jumper wire between TFT and SIG RTN terminal of connector. Perform KOEO and KOER self-test. If DTC P0712 is present, replace TFT sensor. If DTC P0712 is not present, go to next step. If no codes are present, go to step 12).

11) Check Circuit Continuity Leave ignition off and transmission wiring harness connector disconnected. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Measure resistance between test pin No. 37 (TFT) at breakout box and TFT terminal at transmission wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at transmission wiring harness connector. If each resistance measurement is less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST.

12) Check TFT Circuit Short To Power Leave transmission wiring harness connector disconnected. Turn ignition on. Measure voltage between test pin No. 37 (TFT) and test pins No. 77 and 103 (PWR GND) at breakout box. If voltage is 2 volts or more, repair short to power in TFT circuit and repeat QUICK TEST. If voltage is less than 2 volts, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.

20) DTC P1711 This code indicates that self-test has detected TFT sensor circuit input was out of range specification. Possible causes for this code are as follows

1. Fluid level out of specification.
2. Fluid not at operating temperate.
3. Faulty TFT sensor.
4. Faulty PCM.

Ensure transmission fluid temperature is at least 50°F (10°C). Perform KOEO and KOER self-test. If DTC P1711 is present, go to next step. If DTC P1711 is not present, testing is complete.

21) Check VREF At TP Sensor Turn ignition off. Disconnect TP sensor wiring harness connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at connecter. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to CIRCUIT TEST C.

22) Check TFT Sensor Integrity Warm transmission to normal operating temperature. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00959). Connect PCM to breakout box. Turn ignition on. Measure and record resistance between test pin No. 37 and 91 at breakout box. As transmission cools, verify resistance increases as specified. See TFT SENSOR SPECIFICATIONS table. If resistance does not change as specified, replace TFT sensor. If resistance changes as specified, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.

90) Continuous Memory DTC P0712 This code indicates that self-test has detected TFT sensor circuit input below specification. Possible causes for this code are as follows

1. Fluid level out of specification.
2. Short circuit in wiring harness.
3. Faulty TFT sensor.
4. Faulty PCM.

Turn ignition off. Connect scan tester to DLC. Using scan tester, access TFT PID. If TFT PID is 0.5 volt or more, go to next step. If TFT PID is less than 0.5 volt, return to step 1).

91) Wiggle Test TFT Sensor Circuits Turn ignition off. Leave scan tester connected to DLC with TFT PIDs accessed. While shaking and bending TFT sensor wiring harness, observe TFT PID for indication of fault. A fault will be indicated by a sudden change in PID voltage. If fault is indicated, isolate and repair as necessary. If fault is not indicated, problem cannot be duplicated or identified at this time. Testing is complete.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 91) to step 100). No test procedures have been omitted.

100) Continuous Memory DTC P0713 This code indicates that self-test has detected TFT sensor circuit input above specification. Possible causes for this code are as follows

1. Fluid level out of specification.
2. Short between TFT and VPWR circuits.
3. Open in TFT or SIG RTN circuit.
4. Faulty TFT sensor.
5. Faulty PCM.

Turn ignition off. Connect scan tester to DLC. Using scan tester, access TFT PID. If TFT PID is 4.8 volts or less, go to next step. If TFT PID is more than 4.8 volts, return to step 10).

101) Wiggle Test TFT Sensor Circuits Turn ignition off. Leave scan tester connected to DLC with TFT PIDs accessed. While shaking and bending TFT sensor wiring harness, observe TFT PID for indication of fault. A fault will be indicated by a sudden change in PID voltage. If fault is indicated, isolate and repair as necessary. If fault is not indicated, problem cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 101) to step 110). No test procedures have been omitted.

110) Continuous Memory DTC P1783 This code indicates that transmission has overheated. Possible causes for this code are as follows

1. Incorrect transmission fluid level.
2. Faulty transmission cooling system.
3. Excessive load hauling.
4. Faulty transmission connector.

Turn ignition off. Disconnect transmission wiring harness connector. Perform KOEO self-test. If DTC P1783 is present, repair cause of transmission overheating as necessary. If DTC P1783 is not present, testing is complete.

CIRCUIT TEST TF - OUTPUT SHAFT SPEED (OSS) SENSOR

TURBINE SHAFT SPEED (TSS) SENSOR

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

1. Wiring harness circuits (OSS/TSS & SIG RTN).
2. Faulty OSS sensor.
3. Faulty TSS sensor.
4. Faulty PCM.

Identifying OSS/TSS Test Circuit & Connector Terminals. Scheme 52

CCRM interfaces with the EEC-V system to provide control for cooling fan and A/C clutch. CCRM also contains EEC-V power relay, which provides battery power (VPWR) to the Powertrain Control Module (PCM) and EEC-V system. Perform this test only when instructed by QUICK TEST or if directed by a CIRCUIT. This test is only intended to diagnose the following

1. CCRM including EEC power relay, Fan Control/Low Fan Control (FC/LFC) relay.
2. Harness circuits (B+, FANM, FPM, FP, FC KPWR, PWR GND, LFC, HFC, A/C, ACCS and WAC).
3. Powertrain Control Module (PCM).

To prevent replacing good components, be aware the following non-EEC related components or systems may be at fault

1. A/C system.
2. Fuel system.
3. Starting and charging system.

Identifying CCRM Connector Terminals. Scheme 53

CCRM Circuits. Scheme 54

1) Check VPWR Circuit Continuity Turn ignition off. Disconnect IAC and CCRM wiring harness connectors. Disconnect scan tester from Data Link Connector (DLC), if applicable. Measure resistance between IAC terminal of IAC wiring harness connector and terminals No. 12 and 24 of CCRM wiring harness connector. If both resistances are less than 5 ohms, reconnect IAC and go to next step. If either resistance is 5 ohms or more, repair open in VPWR circuit and repeat QUICK TEST.

2) Check B(+) & IGN START/RUN Voltage To CCRM Turn ignition off. Leave CCRM disconnected. Measure voltage between ground and CCRM wiring harness connector terminals No. 8 and No. 10. Turn ignition on. Measure voltage between CCRM wiring harness connector terminal No. 13 and ground. If all voltages are 10.5 volts or more, go to next step. If any voltage is less than 10.5 volts, repair open in circuit and repeat QUICK TEST.

3) Check CCRM Ground Circuit Turn ignition off. Leave CCRM disconnected. Measure voltage between CCRM wiring harness connector terminals No. 8 and 15. If voltage is 10.5 volts or more, replace CCRM. If voltage is less than 10.5 volts, repair open in ground circuit (terminal No. 15).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 15). No test procedures have been omitted.

15) DTC 1479: Check High Fan Control (HFC) Relay DTC 1479 indicates HFC primary circuit failure. Following are possible causes for this fault.

1. Open or shorted circuit.
2. Faulty CCRM.
3. Faulty PCM.

Turn ignition off. Disconnect CCRM wiring harness connector. Measure resistance between terminal No. 17 and 24 at CCRM wiring harness connector. If resistance is 50-100 ohms, go to step 17). If resistance is not 50-100 ohms, replace CCRM and repeat QUICK TEST.

16) Check VPWR Circuit To CCRM Disconnect EEC-V power relay connector. Measure resistance between terminal No. 13 at CCRM wiring harness connector and VPWR circuit at EEC-V power relay wiring harness connector. 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.

17) Check HFC Circuit Continuity Turn ignition off. Disconnect CCRM and PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between HFC test pin at breakout box and CCRM wiring harness connector terminal No. 17. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in HFC circuit and repeat QUICK TEST.

18) Check HFC Circuit For Short To Power Leave CCRM and PCM disconnected. Turn ignition on. Measure voltage between HFC test pin at breakout box and negative battery cable. If voltage is less than one volt, turn ignition off and go to next step. If voltage is one volt or more, repair short to power and repeat QUICK TEST.

19) Check HFC Circuit For Shorts To Ground Turn ignition off. Leave CCRM and PCM disconnected. Disconnect scan tester from DLC, if applicable. Measure resistance between HFC test pin at breakout box and test pins No. 51, 91 (SIG RTN) and 103 (PWR GND). If each measurements is more than 10,000 ohms, replace PCM and repeat QUICK TEST. If measurement is less than 10,000 ohms, repair short in HFC circuit and repeat QUICK TEST.

20) DTC 1474: Check Fan Operation This code indicates primary circuit failure in Low Fan Control (LFC) circuit or Fan Control (FC) circuit for single cooling fan systems. Following are possible causes for this fault.

1. Open or shorted circuit.
2. Faulty CCRM.
3. Faulty PCM.

Turn ignition on. If cooling fan runs continuously, go to step 24). If cooling fan does not run continuously, go to step 22).

21) Check VPWR Circuit To CCRM Disconnect EEC-V power relay connector. Measure resistance between terminal No. 13 at CCRM wiring harness connector and VPWR circuit at EEC-V power relay wiring harness connector. 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.

22) Check FC/LFC Circuit For Short To Ground Leave ignition off and CCRM wiring harness connector disconnected. Disconnect scan tester from DLC, if applicable. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between FC or LFC test pin and test pins No. 51, 91 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 short to ground in FC or LFC circuit and repeat QUICK TEST.

23) Check Fan Operation Turn ignition off. Connect CCRM. Leave PCM disconnected. Turn ignition on. If cooling fan runs continuously, replace PCM and repeat QUICK TEST. If cooling fan does not run continuously, replace CCRM and repeat QUICK TEST.

24) Check FC/LFC Circuit Continuity Disconnect CCRM wiring harness connector. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Perform appropriate procedure. Measure resistance between FC or LFC test pin at breakout box and test pin No. 14 at CCRM wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FC or LFC circuit and repeat QUICK TEST.

25) Check FC/LFC Circuit Short To Power Turn ignition on. Perform appropriate procedure. Measure resistance between FC or LFC test pin at breakout box and negative battery terminal. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in FC or LFC circuit.

26) FC/LFC Circuit Fault Isolation Check Turn ignition off. Reconnect CCRM wiring harness connector. Connect jumper wire between FC or LFC test pin and test pin No. 77 at breakout box. If cooling fan runs continuously, replace CCRM and repeat QUICK TEST. If cooling fan does not run continuously, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 26) to step 30). No test procedures have been omitted.

30) DTC 1473 If DTC 1474 or 1479 is present, repair as necessary before servicing DTC 1473. If DTC 1474 or 1479 is not present, go to next step.

31) Check Fan Operation Allow engine to cool. Turn A/C and defroster off. Turn ignition on. If cooling fan runs continuously, go to next step. If cooling fan does not run continuously, go to step 35).

32) Check For Short In CCRM Turn ignition off. Disconnect CCRM. Turn ignition on. If cooling fan runs continuously, go to next step. If cooling fan does not run continuously, replace CCRM and repeat QUICK TEST.

33) Check For Short In PCM Turn ignition off. Disconnect PCM. Turn ignition on. If cooling fan runs continuously, repair circuit short to power. If cooling fan does not run continuously, replace PCM and repeat QUICK TEST.

34) Check Power To Low Speed Circuit Short To Power Ensure CCRM and PCM are disconnected. Disconnect cooling fan. Turn ignition on. Measure voltage between CCRM terminal No. 1 and negative battery terminal. If voltage is less than one volt, repair short to power in cooling fan "H" terminal circuit. If voltage is one volt or more, repair short to power in cooling fan "L" terminal circuit.

35) Check Fan Monitor (FANM) Circuit Connect scan tester to Data Link Connector (DLC). Turn ignition on. Cooling fan should be off. Using scan tester, access FANM PID. If FANM PID is on, go to next step. If FANM PID is off, go to step 85).

36) Check Fan Operation Leave ignition on. Access Output Test Mode on scan tester. Turn low speed fan on. If cooling fan runs continuously, go to next step. If cooling fan does not run continuously, remain in Output Mode and go to step 40).

37) Check Fan Monitor (FANM) Circuit Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 4 (FANM) and No. 76 or 77 (PWR GND). If resistance is less than 20 ohms, replace PCM and repeat QUICK TEST. If resistance is 20 ohms or more, ohms, repair open FANM circuit.

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.

40) Check Voltage To Cooling Fan Remain in Output Test Mode with low speed fan switched on. Disconnect cooling fan. Measure voltage between power-to-low-speed terminal at cooling fan 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 circuit and repeat QUICK TEST.

41) Check Cooling Fan Ground Circuit Turn ignition off. Disconnect scan tester from DLC. Measure resistance between terminal "L" at cooling fan and negative battery terminal. If resistance is 5 ohms or less, replace cooling fan. If resistance is more than 5 ohms, repair open circuit to cooling fan and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 41) to step 45). No test procedures have been omitted.

45) DTC 1480 This code indicates that Fan Monitor (FANH) does not power-up when control switch is turned to low. Following are possible causes for this fault.

1. Open or shorted circuit.
2. Faulty CCRM.
3. Faulty PCM.

Turn ignition off. Disconnect cooling fan and CCRM wiring harness connectors. Connect negative lead of voltmeter to negative battery cable. Connect positive lead to CCRM wiring harness connector terminals No. 3 and 4. If 9 volts or more are present, go to next step. If less than 9 volts are present, repair open circuit test and repeat QUICK TEST.

46) Check Power To Fan Circuit Continuity Turn ignition off. Leave cooling fan and CCRM disconnected. Measure resistance between terminal "L" at cooling fan connector and CCRM wiring harness connector terminals No. 1 and 2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit to cooling fan and repeat QUICK TEST.

47) Check CCRM Ensure ignition is off. Leave cooling fan disconnected. Reconnect CCRM. Connect scan tester to Data Link Connector (DLC). Access Output Test Mode on scan tester. Turn low speed fan on. Measure voltage between terminal "L" at cooling fan connector and negative battery terminal. If voltage is 9 volts or more, replace PCM and repeat QUICK TEST. If voltage is less than 9 volts, replace CCRM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 47) to step 50). No test procedures have been omitted.

50) DTC 1481 This code indicates that Fan Monitor (FANM) does not power-up when control switch is turned to high. Following are possible causes for this fault.

1. Open or shorted circuit.
2. Faulty CCRM.
3. Faulty cooling fan.

Turn ignition off. Connect scan tester to Data Link Connector (DLC). Turn ignition on. Access Output Test Mode on scan tester. Turn high speed fan on. If fan comes on, fault is intermittent; go to step 80). If fan does not come on, go to next step.

51) Check For Power To CCRM Turn ignition off. Disconnect CCRM wiring harness connectors. Connect negative lead of voltmeter to negative battery terminal. Connect positive lead to CCRM wiring harness connector terminals No. 3 and 4. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open circuit test and repeat QUICK TEST.

52) By-Pass CCRM Turn ignition off. Leave CCRM disconnected. Connect jumper wire between CCRM wiring harness connector terminals No. 4 and 6. If high speed fan operates with jumper wire attached, replace CCRM and repeat QUICK TEST. If high speed fan does not operate, go to next step.

53) Check Circuit Continuity Turn ignition off. Leave CCRM disconnected. Disconnect cooling fan. Measure resistance between terminal "H" of cooling fan and CCRM wiring harness connector terminals No. 6 and 7. If 5 ohms or less are present, replace cooling fan. If either circuit resistance is more than 5 ohms, repair open circuit and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 60). No test procedures have been omitted.

60) DTC 1474: Check LFC/FC Circuit For Open Or Short To Power This code indicates that Fan Control (FC) circuit failure has occurred. If DTC 1474 is present, turn ignition off. Disconnect cooling fan wiring harness connector. Inspect wiring, and repair if damaged. Connect a non-powered test light between cooling fan wiring harness power circuit and ground. Turn ignition on. Light should be off. Check for indication of fault (test light blinks or comes on) while performing one of following

1. Shake and bend LFC/FC circuits between CCRM and PCM.
2. Lightly tap CCRM to simulate road shock.

Turn ignition off. If fault is indicated, isolate and repair as necessary. Repeat QUICK TEST. If fault is not indicated, go to next step.

61) Check LFC/FC Circuit For Short To Ground Leave cooling fan wiring harness connector disconnected. Leave scan tester and test light connected. Turn ignition on. Access Output Test Mode on scan tester. Turn low speed fan on. Test light should be on. Check for indication of fault (test light blinks or goes off) while performing one of following

1. Shake and bend LFC/FC circuits between CCRM and PCM.
2. Lightly tap CCRM to simulate road shock.

Turn ignition off. If fault is indicated, isolate and repair as necessary. Repeat QUICK TEST. If fault is not indicated, problem is intermittent and cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 61) to step 75). No test procedures have been omitted.

75) DTC 1480 This code indicates that during low speed fan operation, a fault occurred in FANM circuit. Following are possible causes for this fault.

1. Open in B+ circuit to CCRM.
2. Open circuit to cooling fan.

Turn ignition off. Connect scan tester to Data Link Connector (DLC). Connect a non-powered test light between cooling fan wiring connector terminal "L" and ground. Turn ignition on. Access Output Test Mode on scan tester. Turn low speed fan on. Test light should be on. Check for indication of fault (test light blinks or goes off) while performing one of following

1. Shake and bend cooling fan power circuit between CCRM and FANM splice.
2. Shake and bend CCRM circuit from terminals No. 3 and 4 (Black/Orange wire).
3. Lightly tap CCRM to simulate road shock.

Turn ignition off. If fault is indicated, isolate and repair as necessary. Repeat QUICK TEST. If fault is not indicated, problem is intermittent and cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 75) to step 85). No test procedures have been omitted.

85) Check For Intermittent Fault In Cooling Fan Circuit Leave scan tester connected to DLC. Ensure A/C and cooling fan are off. Access FANM PID on scan tester.

Observe scan tester for indication of fault while performing the following (FANM PID will turn on to indicate fault)

1. Shake and bend power circuit between CCRM and cooling fan.
2. Shake and bend cooling fan ground circuit.
3. Shake and bend FANM circuit between PCM and splice.
4. Lightly tap CCRM and cooling fan to simulate road shock.

If fault is indicated and cooling fan comes on, isolate and repair short to power. If fault is indicated and cooling fan does not come on, isolate and repair open circuit. Repeat QUICK TEST. If fault is not indicated, problem is intermittent and cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 85) to step 95). No test procedures have been omitted.

95) DTC 1469 This code indicates frequent A/C clutch cycling. Possible causes for this fault are as follows

1. Low A/C refrigerant charge.
2. Damaged A/C cycling switch.
3. Open circuit between Electronic Automatic Temperature Control (EATC) Module and PCM connector terminal No. 41.

Turn ignition off. Inspect A/C system for any mechanical faults. Repair or replace as necessary. If no faults are present, go to next step.

96) Check For Intermittent Open Between EATC Module & PCM Connect scan tester to DLC. Turn ignition on. Using scan tester, access ACCS PID. TURN A/C ON. Observe ACCS PID for indication of fault while performing the following (ACCS PID will turn off and on to indicate fault)

1. Shake and bend power circuit between CCRM and cooling fan.
2. Shake and bend cooling fan ground circuit.
3. Shake and bend FANM circuit between PCM and splice.
4. Lightly tap CCRM and cooling fan to simulate road shock.

If fault is indicated and cooling fan comes on, isolate and repair short to power. If fault is indicated, isolate and repair as necessary. Clear PCM memory and repeat QUICK TEST. If fault is not indicated, problem is intermittent and cannot be duplicated or identified at this time.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 96) to step 100). No test procedures have been omitted.

100) Check For Voltage To Cyclic Pressure Switch Disconnect A/C cycling switch. Turn ignition on. Turn A/C switch on. Measure voltage between A/C Demand switch (or EATC module) side of A/C cycling switch wiring harness connector and negative battery terminal. If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, EEC-V system is okay. Fault is in A/C system.

101) Check A/C Cycling Switch Contacts Turn ignition off. Disconnect A/C cycling switch. Measure resistance between A/C cycling connector terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, EEC-V system is okay. Fault is in A/C system.

102) Check For Voltage To A/C Pressure Switch (ACPSW) Turn ignition off. Reconnect A/C cycling switch. Disconnect ACPSW. Turn ignition on. Turn A/C switch on. Measure voltage between A/C Demand switch terminal of ACPSW wiring harness connector and negative battery terminal. (Scheme 55) If 10.5 volts or more are present, go to next step. If less than 10.5 volts are present, repair open circuit between ACPSW and A/C cycling switch.

Identifying ACPSW Wiring Harness Connector Terminals. Scheme 55

103) Check Continuity Of ACPSW High Pressure Contacts Turn ignition off. Leave ACPSW disconnected. Measure resistance between ACPSW high pressure contacts. (Scheme 56) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, check for overcharged A/C system. If system charge is okay, replace ACPSW.

Identifying ACPSW Connector Terminals. Scheme 56

104) Check Voltage To PCM On ACCS Circuit Turn ignition off. Reconnect ACPSW. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Turn A/C switch on. Measure voltage between breakout box test pins No. 41 (ACCS) and No. 77 (PWR GND). If voltage is 10.5 volts or more, replace PCM and repeat QUICK TEST. If voltage is less than 10.5 volts, repair open circuit between ACPSW and PCM.

105) KOEO/KOER DTC 1460 This code indicates that a fault occurred in Wide Open Throttle A/C Cut-Out (WAC) circuit. Following are possible causes for this fault.

1. A/C on during Self-Test.
2. Open or shorted circuit.
3. Faulty CCRM.
4. Faulty PCM.

Turn A/C and defroster off. Leave scan tester connected to 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 125)

106) Check WAC Circuit For Short To Power Turn ignition off. Disconnect CCRM. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between breakout box test pin No. 69 (WAC) and test pins No. 51 and No. 103 (PWR GND). If voltage is less than one volt, go to next step. If voltage is one volt or more, repair WAC circuit short to power.

107) Check WAC Circuit For Short To Ground Turn ignition off. Leave CCRM and PCM disconnected. Disconnect scan tool from DLC. Measure resistance between breakout box test pin No. 69 (WAC) 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 WAC circuit short to power and repeat QUICK TEST.

108) Check WAC Circuit Continuity Turn ignition off. Leave CCRM and PCM disconnected. Disconnect scan tester from DLC (if applicable). Measure resistance between breakout box test pin No. 69 (WAC) and test pin No. 22 at CCRM wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open in WAC circuit and repeat QUICK TEST.

109) Check WAC Operation Leave ignition off and PCM disconnected. Reconnect CCRM. Ensure A/C clutch is connected. Turn ignition on. Turn A/C demand switch on. Connect jumper wire between breakout box test pins No. 69 (WAC) and No. 77 (PWR GND). Disconnect and reconnect jumper wire several times whiles observing A/C clutch engagement. If A/C clutch engagement can be controlled by jumper wire, replace PCM and repeat QUICK TEST. If A/C clutch engagement cannot be controlled by jumper wire, replace CCRM and repeat QUICK TEST.

110) No A/C Operation Turn ignition off. Disconnect CCRM. Turn ignition on. Turn A/C demand switch on. Measure voltage between CCRM wiring harness connector terminals No. 15 and 21. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in A/C demand circuit between CCRM and ACCS splice to PCM and re-evaluate symptom

111) Check Circuit Continuity Turn ignition off. Leave CCRM disconnected. Disconnect scan tester from DLC (if applicable). Disconnect A/C clutch. Measure resistance between CCRM wiring harness connector terminal No. 16 and ground side of A/C clutch wiring harness connector. Measure resistance between CCRM wiring harness connector terminal No. 23 and power side of A/C clutch wiring harness connector. If either resistance is less than 5 ohms, replace CCRM and re-evaluate symptom. If either resistance 5 ohms or more, repair open circuit and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 111) to step 120). No test procedures have been omitted.

120) Continuous Memory DTC 1460: Intermittent WAC Circuit Failure DTC 1460 indicates an open or short in Wide Open Throttle A/C Cut-Out (WAC) circuit.

Note. Disregard DTC 1460 if vehicle is not equipped with A/C.

Turn ignition off. Connect scan tester to DLC. Disconnect A/C cyclic pressure switch. Connect switch terminals using a jumper wire. Turn ignition on. Turn A/C demand switch on. Check circuit integrity by shaking and bending WAC wiring harness while listening to A/C clutch. If a fault is located in the circuit, the A/C clutch will cycle on or off. Check CCRM by tapping lightly to simulate road shock. If a fault is located, isolate and repair as necessary. If fault is not located, problem cannot be duplicated or identified at this time.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 120) to step 125). No test procedures have been omitted.

125) ACCS PID On Turn ignition off. Disconnect A/C cycling switch. Connect scan tester to DLC. Turn ignition on. Using scan tester, access ACCS PID. If ACCS PID does not go off, go to next step. If ACCS PID goes off, check A/C switch and repair or replace as necessary. If A/C switch is okay, repair short to power in A/C demand circuit to A/C cycling switch.

126) Check A/C Clutch Circuit For Short To Power Turn ignition off. Leave CCRM disconnected. Measure voltage between CCRM wiring harness connector terminals No. 23 and negative battery terminal. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair circuit short to power and re-evaluate symptom.

127) Check ACCS Circuit For Short To Power Turn ignition off. Leave A/C cycling switch and CCRM disconnected. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage at breakout box test pin No. 41 (ACCS) and test pins No. 51 and 103 (PWR GND). If voltage is less than one volt, go to next step. If voltage is one volt or more, repair circuit short to power and re-evaluate symptom.

128) Check ACCS Circuit Voltage To PCM Turn ignition off. Leave A/C cycling switch and PCM disconnected. Reconnect CCRM. Turn ignition on. Measure voltage between breakout box test pin No. 41 (ACCS) and test pins No. 51 and 103 (PWR GND). If voltage is less than one volt, replace PCM and re-evaluate symptom. If voltage is one volt or more, replace CCRM and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 128) to step 130). No test procedures have been omitted.

130) No WAC & No DTCs Turn ignition off. Ensure A/C clutch and CCRM are connected. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Turn A/C demand switch on. Connect jumper wire between breakout box test pins No. 69 (WAC) and No. 77 (PWR GND). Disconnect and reconnect jumper wire several times while observing A/C clutch engagement. If A/C clutch engagement cannot be controlled by jumper wire, replace CCRM and re-evaluate symptom. If A/C clutch engagement can be controlled by jumper wire, EEC-V system is okay and testing is complete.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 130) to step 150). No test procedures have been omitted.

150) No Fuel Pressure While listening for fuel pump operation, turn ignition on. Fuel pump should operate for about one second and then shut off. If fuel pump does not operate correctly, turn ignition off. With scan tester connected to DLC, enter Output Test Mode. While listening to fuel pump, turn outputs on. If fuel pump operates, fuel pump circuits are okay; check fuel pump and repair as necessary. If fuel pump does not operate, go to next step.

151) Check FPA PID During KOEO Turn ignition on while viewing FPA PID. If FPA PID comes on when ignition is turned on, go to next step. If FPA PID does not come on when ignition is turned on, go to step 157).

152) Check FPA PID During KOEC Crank engine while viewing FPAPID. If FPA PID is on while engine is cranking, go to next step. If FPA PID is not on while engine is cranking, go to step 160).

153) Check FPM PID During KOEO Turn ignition on while viewing FPM PID. If FPM PID comes on when ignition is turned on, go to next step. If FPM PID does not come on when ignition is turned on, turn ignition off. Verify Inertia Fuel Shutoff (IFS) switch is reset. If switch is okay, check for open in power-to-pump circuit, poor fuel pump ground or open in fuel pump or IFS. Repair as necessary.

154) Check FPM PID During KOEC Crank engine while viewing FPM PID. If FPM PID is on while engine is cranking, electrical circuits are okay. Go to CIRCUIT TEST HC. If FPM PID is not on while engine is cranking, go to step 165).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 154) to step 157). No test procedures have been omitted.

157) Check Fuel Pump Relay Coil Resistance Turn ignition off. Disconnect CCRM. Measure resistance between CCRM wiring harness connector terminals No. 18 and 24. If resistance is 65-120 ohms, go to next step. If resistance is not 65-120 ohms, replace CCRM and re-evaluate symptom.

158) Check FP Circuit Continuity Turn ignition off. Leave CCRM disconnected. Disconnect PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 18 and test pin No. 80 (FP). If resistance is less than 5 ohms, replace PCM and re-evaluate symptom. If resistance is 5 ohms or more, repair open in FP circuit and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 158) to step 160). No test procedures have been omitted.

160) Check Fuel Pump Relay Coil Resistance & FP Circuit For Short To Power In CCRM Turn ignition off. Leave CCRM disconnected. Measure resistance between CCRM wiring harness connector terminals No. 18 and 24. Resistance should be 65-120 ohms. Measure resistance between CCRM wiring harness connector terminals No. 18 and the following terminals: No. 1 through 11 and No. 13. Resistance should be greater than 10,000 ohms. If all resistance checks are okay, go to next step. If any resistance is not okay, replace CCRM and re-evaluate symptom.

161) Check FP Circuit For Short To Power In CCRM Leave CCRM disconnected. Disconnect PCM and inspect connector terminals for damage. Turn ignition on. Measure voltage between CCRM wiring harness connector terminals No. 18 and negative battery terminal. If voltage is less than one volt, replace PCM and re-evaluate symptom. If voltage is one volt or more, repair FP circuit short to power and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 161) to step 165). No test procedures have been omitted.

165) Check For Power To Fuel Pump Relay Turn ignition off. Disconnect CCRM wiring harness connector. Measure voltage between CCRM wiring harness connector terminal No. 11 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 B+ circuit to CCRM and re-evaluate symptom.

166) Check Power To Pump Circuit Continuity Leave ignition off and CCRM disconnected. Disconnect scan tester, if applicable. Measure resistance between CCRM wiring harness connector terminal No. 5 and negative battery terminal. If resistance is less than 10 ohms, replace CCRM and re-evaluate symptom. If resistance is 10 ohms or more, repair open in power-to-pump circuit between CCRM and FPM splice and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 166) to step 175). No test procedures have been omitted.

175) Fuel Pump Runs Continuously: Verify FPA PID Is Off With ignition off, connect scan tester to DLC (if necessary). Turn ignition on and wait 5 seconds. Access FPA PID on scan tester. If FPA PID is off, go to next step. If FPA PID is on, go to step 180).

176) Check FPM PID With scan tester connected and ignition on, access FPM PID. If FPM PID comes on, go to next step. If FPM PID does not comes on, EEC-V system is okay. Go to CIRCUIT TEST Z.

177) Check CCRM Turn ignition off. Disconnect CCRM. Turn ignition on. If fuel pump is off, replace CCRM and re-evaluate symptom. If fuel pump is on, repair FPM circuit short to power and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 177) to step 180). No test procedures have been omitted.

180) Check PCM Turn ignition off. Disconnect PCM wiring harness connector. Turn ignition on. If fuel pump is off, replace PCM and re-evaluate symptom. If fuel pump is on, go to next step.

181) Check FP Circuit For Short To Ground Turn ignition off. Disconnect scan tester from DLC (if applicable). Disconnect CCRM and PCM wiring harness connector. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 80 and test pins No. 51, 103 (PWR GND) and 91 (SIG RTN). If each resistance measurement is more than 10,000 ohms, replace CCRM and re-evaluate symptom. If any resistance measurement is 10,000 ohms or less, repair FP circuit short to ground and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 181) to step 190). No test procedures have been omitted.

190) DTC P0230: Check VPWR Circuit To PCM This code indicates fuel pump primary circuit failure. Following are possible causes for this fault.

1. Open or shorted FP circuit.
2. Open VPWR circuit to CCRM.
3. Faulty CCRM.
4. Faulty PCM.

Turn ignition off. Disconnect CCRM wiring harness connector. Disconnect EEC-V power relay. Measure resistance between terminal No. 13 at CCRM wiring harness connector and VPWR circuit at EEC-V power relay wiring harness connector. (Scheme 53) 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.

191) Check Fuel Pump Relay & FP Circuit Turn ignition off. Leave CCRM disconnected. Perform the following resistance checks

1. Check fuel pump relay coil by measuring resistance between terminal No. 13 and 18 of CCRM. Resistance should be 65-120 ohms.
2. Check CCRM for internal short to power by measuring resistance between terminal No. 13 and terminals No. 1-8, 10, 11, 12 and 24. Each resistance measurement should be more than 10,000 ohms.
3. Check CCRM for internal short to ground by measuring resistance between terminals No. 15 and 18. Measure resistance between terminal No. 18 and CCRM housing.

Each resistance measurement should be more than 10,000 ohms. If all resistance checks are okay, go to next step. If any resistance check is incorrect, replace CCRM and repeat QUICK TEST.

192) Check Fuel Pump Circuit For Short To Power Turn ignition off. Disconnect CCRM and PCM wiring harness connector. Inspect wiring, and repair if damaged. Turn ignition on. Measure voltage between negative battery terminal and CCRM wiring harness connector terminal No. 18. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair circuit short to power and repeat QUICK TEST.

193) Check Fuel Pump Circuit For Shorts To Ground Turn ignition off. Leave CCRM and PCM disconnected. Disconnect scan tester from DLC, if applicable. Measure resistance between negative battery terminal and CCRM connector terminal No. 18. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground and repeat QUICK TEST.

194) Check FP Circuit Continuity Turn ignition off. Leave CCRM and PCM disconnected. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 80 and CCRM connector terminal No. 18. If resistance is more than 5 ohms and DTC P0231 or P0232 is present, go to next step. If resistance is more than 5 ohms and DTC P0231 or P0232 is not present, replace PCM and repeat QUICK TEST. If resistance measurement is 5 ohms or less, repair open circuit and repeat QUICK TEST.

195) Check PCM Turn ignition off. Remove breakout box. Reconnect CCRM and PCM. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FPA PID. If FPA PID stays off, go to next step. If FPA PID comes on, replace PCM and repeat QUICK TEST.

196) Crank engine while viewing FPA PID. If FPA PID is on while engine is cranking, and DTC P0231 is present, go to step 210). If FPA PID is on while engine is cranking, and DTC P0232 is present, go to step 200). If FPA PID is not on while engine is cranking, replace PCM and repeat QUICK TEST.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 196) to step 200). No test procedures have been omitted.

200) DTC P0232 If engine will start, go to next step. If engine will not start, go to step 205).

201) Check Fuel Pump Operation Turn ignition on. Listen for motor noise coming from fuel pump. If fuel can be heard, go to next step. If fuel pump cannot be heard, go to step 203).

202) Check Fuel Pump Relay Turn ignition off. Disconnect CCRM. Turn ignition on. Listen for motor noise coming from fuel pump. If fuel pump cannot be heard, replace CCRM and repeat QUICK TEST. If fuel pump can be heard, repair circuit short to power and repeat QUICK TEST.

203) Check FPM Circuit Continuity Turn ignition off. Leave CCRM disconnected. Inspect wiring, and repair if damaged. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 40 and CCRM connector terminal No. 5. If resistance is less than 5 ohms, replace PCM and repeat QUICK TEST. If resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST.

204) Check Inertia Fuel Shutoff (IFS) Switch Turn ignition off. Locate IFS switch in trunk. Disconnect IFS switch. Inspect wiring, and repair if damaged. Measure resistance between terminals "C" and NC. If resistance is less than 5 ohms, go to next step. If resistance measurement is 5 ohms or more, reset or replace IFS switch.

205) Leave ignition off and IFS switch disconnected. Disconnect CCRM. Measure resistance between power-to-pump terminal of IFS switch and terminal No. 5 of CCRM wiring harness connector. If resistance is less than 5 ohms, check for faulty fuel pump or fuel pump ground. If resistance measurement is 5 ohms or more, repair open in power-to-pump circuit.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 205) to step 210). No test procedures have been omitted.

210) DTC P0231 If engine will start, replace PCM. If engine will not start, go to next step.

211) Check For Power To Fuel Pump Relay Turn ignition off. Disconnect CCRM wiring harness connector. Measure voltage between CCRM wiring harness connector terminal No. 5 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 B+ circuit to CCRM and repeat QUICK TEST.

212) Check Power-To-Pump Circuit Continuity Leave ignition off and CCRM disconnected. Disconnect scan tester, if applicable. Measure resistance between CCRM wiring harness connector terminal No. 5 and negative battery terminal. If resistance is less than 10 ohms, replace CCRM and re-evaluate symptom. If resistance is 10 ohms or more, repair open in power to pump circuit between CCRM and FPM splice and re-evaluate symptom.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 212) to step 220). No test procedures have been omitted.

220) Continuous Memory DTC P0232 Turn ignition off. Connect scan tester to DLC. Turn ignition on. Using scan tester, access FPM PID. Observe FPM PID for indication of fault while tapping on IFS switch. Fault will be indicated if FPM PID comes on. Check circuit integrity by shaking and bending fuel system wiring harness. If a fault is located, isolate and repair as necessary. If fault is not located, problem cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 220) to step 225). No test procedures have been omitted.

225) Continuous Memory DTC P0231 Turn ignition off. Disconnect PCM. Install EEC-V Breakout Box (014-00950). Connect PCM. Connect jumper wire between breakout box test pin No. 40 and 51. Connect scan tester to DLC. Turn ignition on. Using scan tester, access Output Test Mode. Command outputs on. DVOM should read 10 volts or more. Check for indication of fault while tapping on CCRM. Fault will be indicated by sudden change of voltage. Check circuit integrity by shaking and bending fuel system wiring harness. If a fault is located, isolate and repair as necessary. If fault is not located, problem cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 225) to step 230). No test procedures have been omitted.

230) Continuous Memory DTC P0230 Turn ignition off. Connect scan tester to DLC. Turn ignition on an wait 5 seconds. Using scan tester, access FPA PID. Observe FPA PID for indication of fault while tapping on CCRM. Fault will be indicated if FPA PID comes on. Check circuit integrity by shaking and bending fuel system wiring harness. Check CCRM and PCM connectors for damage or corrosion. If a fault is located, isolate and repair as necessary. If fault is not located, and DTC P0231 or P0232 is present, problem is intermittent fuel pump secondary circuit fault. If fault is not located, and DTC P0231 or P0232 is not present, problem cannot be duplicated or identified at this time. Go to CIRCUIT TEST Z.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 230) to step 241). No test procedures have been omitted.

241) Cooling Fan Does Not Operate At Any Speed Turn ignition on. Disconnect cooling fan motor. Command cooling fan on. Measure voltage between negative battery terminal and power-to-fan circuit terminal at cooling fan wiring harness connector. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, go to step 245).

242) Check B+ Circuit To Fan Relays Turn ignition off. Ensure cooling fan is disconnected. Disconnect CCRM. Measure voltage between ground and terminals No. 3 and 4 of CCRM wiring harness connector. If each reading is more than 10 volts, go to next step. If any reading is 10 volts or less, fault exists in B+ circuit. Check cooling fan related fuse/fuse links. If fuse/fuse link is blown, check for short to ground in B+ circuit. Repair as necessary. If fuse/fuse link is okay, check for open B+ circuit. Repair as necessary. After repair is completed, reconnect all components and recheck system operation.

243) Check Power To Fan(s) Circuit Turn ignition off. Ensure CCRM and cooling fan is disconnected. Measure resistance of power-to-fan circuit (Red/Orange wire) between cooling fan wiring harness connector and terminal No. 2 at CCRM wiring harness connector. If each reading is less than 5 ohms, replace CCRM. Reconnect all components and recheck system operation. If any reading is 5 ohms or more, locate and repair open circuit(s) between cooling fan motor and CCRM. After repair is completed, reconnect all components and recheck system operation.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 243) to step 245). No test procedures have been omitted.

245) Check Cooling Fan Ground Circuit Turn ignition off. Ensure cooling fan is disconnected. Disconnect NGS scan tester from Data Link Connector (DLC), if applicable. Measure resistance between negative battery terminal and ground circuit terminal at cooling fan wiring harness connector. If resistance is 5 ohms or more, locate and repair open ground circuit. Reconnect all components and recheck system operation. If resistance is less than 5 ohms, replace cooling fan motor.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 245) to step 275). No test procedures have been omitted.

Note. For 2-speed fan applications, the A/C Pressure Switch (ACPSW) must also be checked.

275) Cooling Fan Always Runs Turn all accessories off. Turn ignition on. Verify that cooling fan is always on. Turn ignition off. Disconnect CCRM. Turn ignition on. If cooling fan is off, replace CCRM and recheck system operation. If cooling fan is still on, locate and repair short to power in power-to-fan circuit.

276) Check Fan Operation With PCM Disconnected Turn ignition off. Disconnect CCRM. Disconnect PCM connector. Clean or repair connector as necessary. Turn ignition on. If cooling fan is off, replace PCM. Reconnect all components and recheck system operation. If cooling fan is still on, go to next step.

277) Check For Short To Power Turn ignition off. Ensure CCRM is disconnected. Disconnect PCM. Disconnect cooling fan motor. Turn ignition on. Check voltage between ground and power-to-low fan circuit terminal and power-to-high fan circuit terminal at cooling fan wiring harness connector. If either reading is one volt or more, locate and repair short to power. If both readings are less than one volt, no fault is indicated at this time. Reconnect all components and recheck system operation.

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

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

1) Intermittent Test Procedure Proceed to the appropriate circuit test as follows

1. Intermittent input wiggle test procedure; go to step 10).
2. Intermittent output actuator test procedure; go to step 20).
3. Intermittent water check procedure; go to step 30).
4. Intermittent road test procedure; go to step 40).
5. Intermittent ignition test procedure; go to step 50).

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.

10) Intermittent Input KOEO Wiggle Test Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or component fault. Turn ignition on. While observing PID value, wiggle and pull on component wiring and connector. See the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. Lightly tap on component. If PID value(s) is okay, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace suspect component. If replacement component does not repair fault, install original component and go to next step.

11) Leave ignition on with PIDs accessed. While observing PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. If PID value(s) remain within specification, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace PCM. If replacement PCM does not repair fault, install original PCM. Return to step 1) and choose another procedure.

12) Intermittent Input KOER Wiggle Test Leave ignition on with PIDs accessed. Access PIDs from the area of suspected wiring or component fault. Start engine and allow to idle. While observing PID value, wiggle and pull on component wiring and connector. See the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. Lightly tap on component. If PID value(s) is okay, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace suspect component. If replacement component does not repair fault, install original component and go to next step.

13) Leave engine running at idle speed with PIDs accessed. While observing PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. If PID value(s) remain within specification, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace PCM. If replacement PCM does not repair fault, install original PCM. Return to step 1) and choose another procedure.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 20). No test procedures have been omitted.

20) Intermittent KOEO Output Actuator Test If no symptoms or trouble codes are present, perform road test procedure specified in steps 40) through 43). Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or component fault. Record trouble codes in PCM memory, if present. Disconnect 104-pin connector from PCM. Install Breakout Box (014-000959). Connect positive lead of voltmeter to output control circuit of suspect component. Connect negative lead to ground. Turn ignition on. Enter scan tester's Output Test Mode. Activate suspect component. While observing voltmeter reading and PID value, lightly tap on component. Compare readings to specification. See the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. If readings are correct and remain stable within 1.0 volt, go to next step. If readings are incorrect or unstable within 1.0 volt, replace component. If replacement component does not repair fault, install original component and go to next step.

21) Leave ignition on with PIDs accessed. While observing voltmeter reading and PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. Compare readings to specification. See the article PIN VOLTAGE CHARTS - EEC-V (3.8L) . If readings are correct and remain stable within 1.0 volt, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If readings are incorrect or unstable within 1.0 volt, isolate fault and repair as necessary.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 30). No test procedures have been omitted.

30) Intermittent Water Check Procedure Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or component fault. Start engine and allow to idle. Spray water on suspect component, circuit and connector. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. If no faults occur, go to next step. If fault occurs, isolate and repair as necessary.

31) With engine running, spray water on spark plugs, spark plug wires, ICM, CKP sensor and CMP sensor. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. See the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. If no faults occur, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If fault occurs, isolate and repair as necessary.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 40). No test procedures have been omitted.

40) Intermittent Road Test Procedure This procedure will monitor PIDs and components using a scan tester on a road test. An assistant is necessary for some procedures.

This procedure is performed under 4 different conditions; KOEO, Engine running at idle speed, 30 MPH and 55 MPH. Compare information with specifications listed in the PIN VOLTAGE CHARTS - EEC-V (3.8L) article.

Turn ignition off. Connect scan tester to DLC. Access PIDs from the area of suspected wiring or fault. Compare values to KOEO values given in the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. Watch for fault indicated by PID value out of specification. If no faults occur, go to next step. If fault occurs, go to step 10) for input system fault or step 20) for output system fault.

41) With scan tester connected to DLC, remain in PID access mode. Start engine and allow to idle. With engine warmed to operating temperature, watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to HOT IDLE values given in the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. If values remain within specifications, go to next step. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.

42) Leave scan tester connected to DLC in PID access mode. Ensure all accessories are off. Using an assistant, test drive vehicle at 30 MPH. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to 30 MPH values given in the PIN VOLTAGE CHARTS - EEC-V (3.8L) article. If values remain within specification, go to next step. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.

43) Leave scan tester connected to DLC in PID access mode. Test drive vehicle at 55 MPH. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to 55 MPH values given in the article PIN VOLTAGE CHARTS - EEC-V (3.8L) . If values remain within specification, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 43) to step 50). No test procedures have been omitted.

50) Intermittent Ignition Test Procedure Ensure all accessories are off. Perform QUICK TEST. If trouble codes are present, service as necessary before continuing. If no trouble codes are present, connect Intermittent Ignition Analyzer (007-000075) and go to next step. If intermittent ignition analyzer is not available, return to step 1) and choose another procedure.

51) Turn ignition off. Ensure all accessories are off. Install correct overlay on front of tester panel. Install program cartridge in slot. Connect EI HIGH DATA RATE harness adapter to DIST tester. Ensure that CKP SIMULATION switch and WIGGLE TEST switch are off. Disconnect ICM wiring harness connector. Check connector terminals for damage or contamination and repair as necessary. Attach male ICM connector of tester to ICM wiring harness connector. Attach female ICM connector of tester to ICM. Turn ignition on and press tester RESET button. If tester performs self-test and VPWR LED comes on, go to step 53). If tester does not perform self-test or VPWR LED does not come on, go to next step.

52) Scan Tester Check Turn ignition off. Disconnect intermittent ignition analyzer. Connect jumper wire between VPWR terminal of tester and positive battery terminal. Connect jumper wire between PWR GND terminal of tester and negative battery terminal. If tester passes self-test, go to next step. If tester does not pass self-test, repair or replace as necessary and go to next step.

53) Recreate Fault Turn ignition on. Check Fault Memory and System Status LEDs. If LEDs are on, go to next step. If either LEDs are on, go to step 59).

54) If COIL LED is off, go to next step. If COIL LED is on, go to step 80).

55) If IGN GND LED is off, go to next step. If IGN GND LED is on, go to step 200).

Note. If IGN GND or CKP SHD LED comes on anytime during testing, go to step 200) for IGN GND or step 210) for CKP SHD.

56) If CKP SHD LED is off, go to next step. If CKP SHD LED is on, go to step 210).

57) ICM Status If ICM OK LED is blinking, go to next step. If ICM OK LED is not blinking, go to step 95).

58) CKP BIAS Status If CKP BIAS LED is off, go to next step. If CKP BIAS LED is on, go to step 120).

59) Recreate Fault Ensure DIST is connected to vehicle. Test drive vehicle. If vehicle will not start, crank engine for 5 seconds. If Fault Memory and System Status LEDs are on, go to next step. If LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure.

60) CKP SIGNAL Fault If CKP SIGNAL LED is off during cranking, go to next step. If CKP SIGNAL LED is on during cranking, go to step 130).

61) IDM Fault If IDM LED is off, go to next step. If IDM LED is on, go to step 95).

62) IDM TACH Fault If IDM TACH LED is off, go to next step. If IDM TACH LED is on, go to step 95).

63) CKP Fault If CKP LED is off, go to next step. If CKP LED is on, go to step 130).

64) SPOUT Fault If SPOUT LED is off, go to next step. If SPOUT LED is on, go to step 170).

65) PIP Fault If PIP LED is off, go to next step. If PIP LED is on, go to step 150).

66) BASE TIMING Fault With engine warm, if BASE TIMING LED is off, go to next step. If BASE TIMING LED is on, go to step 170).

67) COIL Fault If COIL LED is off, go to next step. If COIL LED is on, go to step 80).

68) Secondary Fault If COIL LEDs are flashing, go to intermittent ignition analyzer service manual for CKP SIMULATION TEST. If COIL LEDs are not flashing, fault cannot be identified with this procedure. Return to step 1) and choose another procedure.

69) IGN GND Fault If IGN GND LED is off, go to next step. If IGN GND LED is on, go to step 200).

70) CKP SHD Fault If CKP SHD LED is off, return to step 1) and choose another procedure. If CKP SHD LED is on, go to step 210).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 70) to step 80). No test procedures have been omitted.

80) VBATC Circuit Check Turn ignition off. Disconnect ignition coil packs. Connect Intermittent Ignition Analyzer (007-000075). Turn ignition on. Measure voltage between ignition coil pack wiring harness connector VBATC terminal and IGN GND jack of intermittent ignition analyzer. If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open in VBAT circuit.

81) Check For Short Turn ignition off. Measure resistance between IGN GND jack and COIL jack of intermittent ignition analyzer. Measure resistance between VBAT jack and COIL jack of intermittent ignition analyzer. If resistance is 6000 ohms or more, go to next step. If resistance is less than 6000 ohms, go to step 86).

82) COIL Circuit Check Leave ignition off. Measure resistance between each ignition coil pack wiring harness connector COIL terminal and corresponding jack of intermittent ignition analyzer. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair open in COIL circuit.

83) Coil Check Leave ignition off. Reconnect ignition coil packs. Turn ignition on. Press intermittent ignition analyzer reset button. If all COIL LEDs are off, go to next step. If any COIL LEDs are on, go to step 88).

84) Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

85) Turn ignition off. Disconnect coil packs. Turn ignition on. Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

86) Circuit Check Turn ignition off. Disconnect ICM. Measure resistance between COIL jack and IGN GND jack of intermittent ignition analyzer. Measure resistance between COIL jack and VBAT jack. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair open in COIL circuit.

87) Leave ignition off. Measure resistance between each COIL jack and all other COIL jacks of intermittent ignition analyzer. If each resistance measurement is 10,000 ohms or more, replace ICM. If any resistance is less than 10,000 ohms, repair open in coil circuit.

88) System Visual Check Leave ignition off. Check ignition system for damage, loose connections or corrosion. Repair if necessary. If ignition system looks okay, replace ignition coil pack(s).

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 88) to step 95). No test procedures have been omitted.

95) IDM TACH Fault If IDM TACH LEDs were off when fault was recreated, go to next step. If IDM TACH LEDs were on when fault was recreated, replace ICM.

96) Circuit Check Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Measure resistance between IDM jack and VPWR jack of intermittent ignition analyzer. Measure resistance between IDM jack and PWR GND jack. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, go to step 102).

97) ICM Check Turn ignition off. Reconnect ICM. Turn ignition on. Press intermittent ignition analyzer RESET button. If ICM OK LED is blinking, go to next step. If ICM OK LED is not blinking, replace ICM.

98) Wiggle Check Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Set MODE switch to "B". Press intermittent ignition analyzer RESET button and wait 5 seconds for initialization. If all fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

99) Turn ignition off. Disconnect PCM 104-pin connector. Turn ignition on. Press intermittent ignition analyzer RESET button and wait 5 seconds for initialization. If all fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

100) If any IDM codes were present in QUICK TEST, go to next step. If IDM codes were not present in QUICK TEST, replace ICM.

101) Circuit Check Leave ignition off and PCM disconnected. Measure resistance between IDM jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair IDM circuit short in wiring harness.

102) Leave ignition off and PCM disconnected. Measure resistance between IDM jack and PWR GND jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, replace PCM. If resistance is less than 10,000 ohms, repair IDM circuit short in wiring harness.

103) Turn ignition off. Install EEC-V Breakout Box (014-00950). Measure resistance between IDM jack of intermittent ignition analyzer test pins No. 4 at the breakout box. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open circuit between ICM and PCM.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 103) to step 120). No test procedures have been omitted.

120) Check CKP BIAS Turn ignition off. Disconnect CKP sensor wiring harness connector. Turn ignition on. If CKP BIAS LEDs are off, go to next step. If CKP BIAS LEDs are on, go to step 122).

121) Circuit Check Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Measure resistance between CKP+ jack and VPWR jack of intermittent ignition analyzer. Measure resistance between CKP+ jack and PWR GND jack. If resistance is 10,000 ohms or more, replace ICM. If resistance is less than 10,000 ohms, repair CKP+ circuit short in wiring harness.

122) Circuit Check Turn ignition off. Measure resistance between CKP- jack and VPWR jack of intermittent ignition analyzer. Measure resistance between CKP- jack and PWR GND jack. If resistance is 10,000 ohms or more, replace CKP sensor. If resistance is less than 10,000 ohms, go to next step.

123) Turn ignition off. Disconnect ICM from intermittent ignition analyzer. Measure resistance between CKP- jack and PWR GND jack. Measure resistance between CKP- jack and VPWR jack of intermittent ignition analyzer. If each resistance measurement is 10,000 ohms or more, replace ICM. If either resistance measurement is less than 10,000 ohms, repair CKP- circuit short in wiring harness.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 123) to step 130). No test procedures have been omitted.

130) CKP Signal Check Crank or start engine. If CKP SIGNAL LED is on, go to next step. If CKP SIGNAL is off, go to step 132).

131) Wiggle Check Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

132) Circuit Check Turn ignition off. Disconnect CKP sensor. Measure resistance between CKP+ terminal of CKP sensor wiring harness connector and CKP+ jack of intermittent ignition analyzer. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair CKP+ open circuit in wiring harness.

133) Leave ignition off. Measure resistance between CKP- terminal of CKP sensor wiring harness connector and CKP- jack of intermittent ignition analyzer. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair CKP- open circuit in wiring harness.

134) Leave ignition off. Measure resistance between CKP+ jack and CKP- jack of intermittent ignition analyzer. If resistance is less than 10,000 ohms, go to next step. If resistance is 10,000 ohms or more, go to step 136).

135) Sensor Check Turn ignition off. Inspect CKP sensor and data wheel for damage, correct alignment and air gap. Service sensor and data wheel as necessary. If no problems are found, replace CKP sensor.

136) Leave ignition off. Disconnect ICM from analyzer. Measure resistance between CKP+ jack and CKP- jack of intermittent ignition analyzer. If resistance is less than 10,000 ohms, CKP+ and CKP- are shorted together. Repair as necessary. If resistance is 10,000 ohms or more, replace ICM.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 136) to step 150). No test procedures have been omitted.

150) Capture Fault Crank or start engine. If PIP LED is blinking, go to next step. If PIP is not blinking, go to step 157).

151) Turn ignition off. Disconnect ICM from analyzer. Measure resistance between PIP jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between PIP jack and VPWR jack. If each resistance is 10,000 ohms or more, go to next step. If either resistance is less than 10,000 ohms, go to step 158).

152) Turn ignition on. Measure voltage between PIP jack and PWR GND jack of intermittent ignition analyzer. If voltage is 8.0 volts or less, go to next step. If voltage is more than 8.0 volts, repair PIP circuit short to VPWR.

153) Turn ignition off. Reconnect ICM to analyzer. Turn ignition on. Measure voltage between PIP jack and PWR GND jack of intermittent ignition analyzer. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, replace ICM.

154) Wiggle Check Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

155) Turn ignition off. Disconnect ICM from analyzer. Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to ON position. Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

156) Leave ignition off. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

157) Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

158) Turn ignition off. Disconnect PCM 104-pin connector. Measure resistance between PIP jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between PIP jack and VPWR jack. If each resistance is 10,000 ohms or more, replace PCM. If either resistance is less than 10,000 ohms, repair short in PIP circuit.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 158) to step 170). No test procedures have been omitted.

170) If engine starts, go to next step. If engine does not start, go to step 178).

171) Start engine. If BASE TIMING LED is off, go to next step. If BASE TIMING LED is on and all fault memory LEDs are off, replace ICM.

172) If SPOUT LED is blinking, go to next step. If SPOUT is on, go to step 180).

173) Check Circuit Turn ignition off. Disconnect PCM 104-pin connector. Measure resistance between SPOUT jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between SPOUT jack and VPWR jack. If each resistance is 10,000 ohms or more, go to next step. If either resistance is less than 10,000 ohms, go to step 183).

174) Turn ignition off. Disconnect ICM from analyzer. Disconnect PCM 104-pin connector. Measure resistance between SPOUT jack and PWR GND jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace PCM.

175) Leave ignition off. Measure resistance between SPOUT jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, replace PCM.

176) Wiggle Check Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

177) Leave ignition and intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "A". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

178) Turn ignition off. Disconnect PCM 104-pin connector. Install EEC-V Breakout Box (014-00950). Measure resistance between PIP jack of intermittent ignition analyzer test pins No. 56 at the breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PIP circuit.

179) Measure resistance between IGN GND jack of intermittent ignition analyzer test pins No. 16 at the breakout box. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in IGN GND circuit.

180) Turn ignition off. Disconnect PCM 104-pin connector. Install EEC-V Breakout Box (014-00950). Measure resistance between SPOUT jack of intermittent ignition analyzer test pins No. 36 at the breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in SPOUT circuit between ICM and PCM.

181) Wiggle Check Turn ignition off. Reconnect PCM. Disconnect ICM from analyzer. Turn ignition on. Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, go to next step. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

182) Leave ignition and intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "A". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace PCM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent is located.

183) Circuit Check Leave ignition off and ICM disconnected. Measure resistance between SPOUT jack and PWR GND jack of intermittent ignition analyzer. Measure resistance between SPOUT jack and VPWR jack. If each resistance is 10,000 ohms or more, replace ICM. If either resistance is less than 10,000 ohms, repair SPOUT circuit short in harness.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 183) to step 190). No test procedures have been omitted.

190) Check For VPWR Turn ignition on. Measure voltage between VPWR jack of intermittent ignition analyzer and negative battery terminal. If voltage is 6 volts or more, go to next step. If voltage is less than 6 volts, repair open in VPWR circuit to ICM.

191) Check PWR GND Circuit Turn ignition off. Measure resistance between PWR GND jack of intermittent ignition analyzer and negative battery terminal. If resistance is less than 5 ohms, go to next step. If voltage is 5 ohms or more, repair open in PWR GND circuit to ICM.

192) Wiggle Check Connect jumper wire between PWR GND jack of intermittent ignition analyzer and negative battery terminal. Shake and bend wiring harness and connectors. If the intermittent ignition analyzer performs reset, repair open in VPWR circuit to ICM. If the intermittent ignition analyzer does not perform reset, repair open in PWR GND circuit to ICM.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 192) to step 200). No test procedures have been omitted.

200) Check IGN GND Turn ignition on. Measure voltage between IGN GND jack and PWR GND of intermittent ignition analyzer and negative battery terminal. If voltage is -.5 to .5 volt, go to next step. If voltage is not -.5 to .5 volt, go to step 202).

201) Wiggle Check Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If any fault memory LEDs are on, press RESET button and continue to test until intermittent fault is located.

202) Check Circuit Turn ignition off. Disconnect PCM 104-pin wiring harness connector. Measure resistance between IGN GND jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, replace ICM. If resistance is less than 10,000 ohms, repair short in IGN GND circuit.

Note. A break in step numbering sequence occurs at this point. Procedure skips from step 202) to step 210). No test procedures have been omitted.

210) Check Circuit Turn ignition off. Measure resistance between CKP SHD jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, go to step 212).

211) Wiggle Check Turn intermittent ignition analyzer WIGGLE TEST switch on. Turn MODE switch to "B". Press RESET button and wait 5 seconds for initialization. If fault memory LEDs are off, replace ICM. If any fault memory LEDs are on, press RESET button and continue to test until intermittent fault is located.

212) Check Circuit Turn ignition off. Disconnect ICM from tester. Measure resistance between CKP SHD jack and VPWR jack of intermittent ignition analyzer. If resistance is 10,000 ohms or more, replace ICM. If resistance is less than 10,000 ohms, repair short in CKP SHD circuit.