Engine Controls Self-Diagnostics: Overview Chrysler Concorde II

Description

Note. Vehicles equipped with a 2.7L engine are equipped with a Manifold Absolute Pressure (MAP) sensor. Vehicles equipped with a 3.2L and 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as MAP sensor.

Manifold Absolute Pressure (MAP) sensor voltage is monitored with ignition on for less than 350 milliseconds and engine speed less than 255 RPM. DTC will set in Powertrain Control Module (PCM) memory when PCM senses MAP sensor voltage is less than 2.2 volts but more than .019 volt for 300 milliseconds.

Note. Vehicles equipped with a 2.7L engine are equipped with a Manifold Absolute Pressure (MAP) sensor. Vehicles equipped with a 3.2L and 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as MAP sensor.

Manifold Absolute Pressure (MAP) sensor voltage is monitored when engine speed is more than 416 RPM but less than 1500 RPM, Throttle Position (TP) sensor voltage is less than 1.13 volts and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses MAP sensor voltage is less than .1 volt for 2 seconds with engine running.

Note. Vehicles equipped with a 2.7L engine are equipped with a Manifold Absolute Pressure (MAP) sensor. Vehicles equipped with a 3.2L and 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as MAP sensor.

Manifold Absolute Pressure (MAP) sensor voltage is monitored when engine speed is more than 400 RPM, Throttle Position (TP) sensor voltage is less than 1.13 volts and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses MAP sensor voltage is more than 4.88 volts for 2.2 seconds with engine running. Possible causes for DTC to set are: defective MAP sensor, defective PCM, defective connectors or defective wiring.

Note. Vehicles equipped with a 2.7L engine are equipped with an Intake Air Temperature (IAT) sensor. Vehicles equipped with a 3.2L or 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as IAT sensor.

Intake Air Temperature (IAT) sensor voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses IAT sensor voltage is less than .8 volt. Possible causes for DTC to set are: defective IAT sensor, defective PCM, defective connectors or defective wiring.

Note. Vehicles equipped with a 2.7L engine is equipped with an Intake Air Temperature (IAT) sensor. Vehicles equipped with a 3.2L or 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as IAT sensor.

Intake Air Temperature (IAT) sensor voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses IAT sensor voltage is more than 4.9 volts. Possible causes for DTC to set are: defective IAT sensor, defective PCM, defective connectors or defective wiring.

Engine Coolant Temperature (ECT) sensor voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses ECT sensor voltage is less than .8 volt for more than 3 seconds. Possible causes for DTC to set are: defective ECT sensor, defective PCM, defective connectors or defective wiring.

Engine Coolant Temperature (ECT) sensor voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses Engine Coolant Temperature (ECT) sensor voltage is more than 4.98 volts for more than 3 seconds. Possible causes for DTC to set are: defective ECT sensor, defective PCM, defective connectors or defective wiring.

Throttle Position (TP) sensor voltage is monitored with engine running and no Manifold Absolute Pressure (MAP) or TP sensor DTCs present. Engine speed must be more than 1600 RPM for all TP sensor testing. Possible causes for DTC to set are: plugged MAP sensor vacuum port, erratic TP sensor voltage change, defective MAP sensor, defective TP sensor, defective PCM, defective connectors or defective wiring.

Throttle Position (TP) sensor voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses TP sensor voltage is .1 volt for 1.3 seconds. Possible causes for DTC to set are: erratic TP sensor voltage change, defective TP sensor, defective PCM, defective Transmission Control Module (TCM), defective connectors or defective wiring.

Throttle Position (TP) sensor voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses TP sensor voltage is 4.5 volts for 3.2 seconds. Possible causes for DTC to set are: defective TP sensor, defective Transmission Control Module (TCM), defective PCM, defective connectors or defective wiring.

Closed loop operation is monitored for 10 minutes after engine is started. DTC will set in Powertrain Control Module (PCM) memory when PCM senses that engine coolant temperature does not go to more than 18°F (-7.8°C) within 10 minutes after engine is started. Two trips are required to set this DTC. Possible causes for DTC to set are: defective Engine Coolant Temperature (ECT) sensor, defective thermostat or low coolant level.

1/1 Heated Oxygen Sensor (HO2S) voltage is monitored after ignition is turned off and 1/1 HO2S cools down, and after the next time ignition is turned on, provided engine coolant temperature is less than 98°F (37°C) and ambient/battery temperature is within plus or minus 27°F (3°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S voltage is less than .156 volt for 28 seconds after engine is started. Possible causes for DTC to set are: defective 1/1 HO2S, defective PCM, defective connectors or defective wiring.

1/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 4 minutes and engine coolant temperature reaches more than 180°F (82.2°C). DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 1/1 HO2S, defective PCM, defective connectors or defective wiring.

1/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine coolant temperature more than 147°F (64°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes for DTC to set are: engine mechanical problem, exhaust leak, defective 1/1 HO2S, defective connectors or defective wiring.

1/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 2 minutes and engine coolant temperature is more than 170°F (76.7°C). DTC will set in Powertrain Control Module (PCM) memory if 1/1 HO2S signal voltage is .35-.55 volt for 1.5 minutes. Possible causes for DTC to set are: defective 1/1 HO2S, defective PCM, defective connectors or defective wiring.

1/1 Heated Oxygen Sensor (HO2S) heater circuit is monitored with engine at idle immediately after a cold start, with engine coolant temperature less than 147°F (63.9°C) and ambient/battery temperature is within plus or minus 27°F (2.8°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 Heated Oxygen Sensor (HO2S) voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 1/1 HO2S, defective connectors or defective wiring.

1/2 Heated Oxygen Sensor (HO2S) voltage is monitored after ignition is turned off and 1/2 HO2S cools down, and after the next time ignition is turned on, provided engine coolant temperature is less than 98°F (37°C) and ambient/battery temperature is within plus or minus 27°F (3°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/2 HO2S voltage is less than .156 volt for 28 seconds after engine is started. Possible causes for DTC to set are: defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.

1/2 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 4 minutes and engine coolant temperature reaches more than 180°F (82.2°C). DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/2 HO2S voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.

1/2 Heated Oxygen Sensor (HO2S) voltage is monitored with engine coolant temperature more than 147°F (64°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/2 HO2S voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes for DTC to set are: engine mechanical problem, exhaust leak, defective 1/2 HO2S, defective connectors or defective wiring.

1/2 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 2 minutes and engine coolant temperature is more than 170°F (76.7°C). DTC will set in Powertrain Control Module (PCM) memory if 1/2 HO2S signal voltage is .35-.55 volt for 1.5 minutes. Possible causes for DTC to set are: defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.

1/2 Heated Oxygen Sensor (HO2S) heater circuit is monitored with engine at idle immediately after a cold start, with engine coolant temperature less than 147°F (63.9°C) and ambient/battery temperature is within plus or minus 27°F (2.8°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/2 Heated Oxygen Sensor (HO2S) voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 1/2 HO2S, defective connectors or defective wiring.

2/1 Heated Oxygen Sensor (HO2S) voltage is monitored after ignition is turned off and 2/1 HO2S cools down, and after the next time ignition is turned on, provided engine coolant temperature is less than 98°F (37°C) and ambient/battery temperature is within plus or minus 27°F (3°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S voltage is less than .156 volt for 28 seconds after engine is started. Possible causes for DTC to set are: defective 2/1 HO2S, defective PCM, defective connectors or defective wiring.

2/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 4 minutes and engine coolant temperature reaches more than 180°F (82.2°C). DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 2/1 HO2S, defective PCM, defective connectors or defective wiring.

2/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine coolant temperature more than 147°F (64°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes for DTC to set are: engine mechanical problem, exhaust leak, defective 2/1 HO2S, defective connectors or defective wiring.

2/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 2 minutes and engine coolant temperature is more than 170°F (76.7°C). DTC will set in Powertrain Control Module (PCM) memory if 2/1 signal voltage is .35-.55 volt for 1.5 minutes. Possible causes for DTC to set are: defective 2/1 HO2S, defective PCM, defective connectors or defective wiring.

2/1 Heated Oxygen Sensor (HO2S) heater circuit is monitored with engine at idle immediately after a cold start, with engine coolant temperature less than 147°F (63.9°C) and ambient/battery temperature is within plus or minus 27°F (2.8°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 2/1 HO2S, defective connectors or defective wiring.

2/2 Heated Oxygen Sensor (HO2S) voltage is monitored after ignition is turned off and 2/2 HO2S cools down, and after the next time ignition is turned on, provided engine coolant temperature is less than 98°F (37°C) and ambient/battery temperature is within plus or minus 27°F (3°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/2 HO2S voltage is less than .156 volt for 28 seconds after engine is started. Possible causes for DTC to set are: defective 2/2 HO2S, defective PCM, defective connectors or defective wiring.

2/2 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 4 minutes and engine coolant temperature reaches more than 180°F (82.2°C). DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/2 HO2S voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 2/2 HO2S, defective PCM, defective connectors or defective wiring.

2/2 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 2 minutes and engine coolant temperature is more than 170°F (76.7°C). DTC will set in Powertrain Control Module (PCM) memory if 2/2 signal voltage is .35-.55 volt for 1.5 minutes. Possible causes for DTC to set are: defective 2/2 HO2S, defective PCM, defective connectors or defective wiring.

2/2 Heated Oxygen Sensor (HO2S) heater circuit is monitored with engine at idle immediately after a cold start, with engine coolant temperature less than 147°F (63.9°C) and ambient/battery temperature is within plus or minus 27°F (2.8°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/2 HO2S voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 2/2 HO2S, defective connectors or defective wiring.

Fuel system lean condition is monitored with engine running in closed loop mode, ambient/battery temperature at more than 20°F (-6.7°C), and at altitude less than 8000 feet. DTC will set in Powertrain Control Module (PCM) memory when PCM senses fuel system is running too lean on 2 sequential trips. Possible causes for DTC to set are: defective Throttle Position (TP) sensor, binding throttle linkage, defective Engine Coolant Temperature (ECT) sensor, engine mechanical problem, fuel pressure out of specification or defective Manifold Absolute Pressure (MAP) sensor.

Fuel system rich condition is monitored with engine running in closed loop mode, ambient/battery temperature at more than 20°F (-6.7°C), and at altitude less than 8000 feet. DTC will set in Powertrain Control Module (PCM) memory when PCM senses fuel system is running too rich on 2 sequential trips. Possible causes for DTC to set are: defective Throttle Position (TP) sensor, binding throttle linkage, defective Engine Coolant Temperature (ECT) sensor, engine mechanical problem, fuel pressure out of specification or defective Manifold Absolute Pressure (MAP) sensor.

Fuel injector operation is monitored with battery voltage is more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC will set in Powertrain Control Module (PCM) memory .64-10.00 seconds after PCM does not sense any inductive kick 18 milliseconds after injector is turned off, and no other injectors are turned on. Possible causes for DTC to set are: defective injector, defective PCM, defective connectors or defective wiring.

Fuel injector operation is monitored with battery voltage is more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC will set in Powertrain Control Module (PCM) memory .64-10.00 seconds after PCM does not sense any inductive kick 18 milliseconds after injector is turned off, and no other injectors are turned on. Possible causes for DTC to set are: defective injector, defective PCM, defective connectors or defective wiring.

Fuel injector operation is monitored with battery voltage is more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC will set in Powertrain Control Module (PCM) memory .64-10.00 seconds after PCM does not sense any inductive kick 18 milliseconds after injector is turned off, and no other injectors are turned on. Possible causes for DTC to set are: defective injector, defective PCM, defective connectors or defective wiring.

Fuel injector operation is monitored with battery voltage is more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC will set in Powertrain Control Module (PCM) memory .64-10.00 seconds after PCM does not sense any inductive kick 18 milliseconds after injector is turned off, and no other injectors are turned on. Possible causes for DTC to set are: defective injector, defective PCM, defective connectors or defective wiring.

Fuel injector operation is monitored with battery voltage is more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC will set in Powertrain Control Module (PCM) memory .64-10.00 seconds after PCM does not sense any inductive kick 18 milliseconds after injector is turned off, and no other injectors are turned on. Possible causes for DTC to set are: defective injector, defective PCM, defective connectors or defective wiring.

Fuel injector operation is monitored with battery voltage is more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC will set in Powertrain Control Module (PCM) memory .64-10.00 seconds after PCM does not sense any inductive kick 18 milliseconds after injector is turned off, and no other injectors are turned on. Possible causes for DTC to set are: defective injector, defective PCM, defective connectors or defective wiring.

Cylinder misfire is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC will set in Powertrain Control Module (PCM) memory when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes for DTC to set are: defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

Cylinder misfire is monitored with engine running after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC will set in Powertrain Control Module (PCM) memory when more than a 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. For misfire DTC identification, see CYLINDER MISFIRE DTC IDENTIFICATION table. Possible causes for DTC to set are: defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

Crank reference signal is monitored during engine cranking. DTC will set in Powertrain Control Module (PCM) memory when PCM senses no Crankshaft Position (CKP) sensor signal during engine cranking, and at least 3 Camshaft Position (CMP) sensor signals have occurred. Possible causes for DTC to set are: defective tone wheel/flexplate, defective PCM, defective CKP sensor, defective connectors or defective wiring.

Scheme 1

1. Turn ignition on. Using scan tool, select INPUTS/OUTPUTS and read current CKP state while cranking engine. If scan tool displays current CKP state PRESENT, go to next step. If scan tool does not display current CKP state PRESENT, go to step 23.
2. Turn engine off. Disconnect CKP sensor connector. CKP sensor is mounted to passenger side of transaxle housing, above the differential housing. (Scheme 1) Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, turn ignition on. Measure voltage between ground and Orange wire at CKP sensor harness connector. If voltage is less than 7.5 volts, go to next step. If voltage is 7.5-8.5 volts, go to step 10. If voltage is more than 8.5 volts, repair short to voltage in Orange wire.
3. Turn ignition off. Ensure CKP sensor is still disconnected. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Orange wire between CKP sensor harness connector and terminal No. 44 at PCM C2 harness connector. see scheme 6 If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange wire.
4. Measure resistance between ground and Orange wire at CKP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Orange wire between CKP sensor and PCM.
5. Turn ignition off. Measure resistance between Black/Light Blue wire and Orange wire at CKP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Orange wire is shorted to Black/Light Blue wire. Repair wiring as necessary.
6. Turn ignition off. Ensure CKP sensor is still disconnected. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and Gray/Black wire at CKP sensor harness connector. If voltage is less than 7.5 volts, go to next step. If voltage is 7.5-8.5 volts, signal circuit (Gray/Black wire) is shorted to 5-volt to 8-volt supply circuit (Orange wire). Repair wiring as necessary. If voltage is more than 8.5 volts, repair short to voltage in Gray/Black wire.
7. Turn ignition off. Measure resistance between ground and Black/Light Blue wire at CKP sensor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 20.
8. Remove CKP sensor. Inspect tone wheel/flexplate for damage. Check slotted areas on tone wheel/flexplate for damage or any foreign debris. Ensure tone wheel/flexplate turns when engine is cranked. Repair or replace tone wheel/flexplate as necessary. If tone wheel/flexplate is okay, go to next step.
9. At this time, PCM is assumed to be defective. Replace PCM.
10. Ensure CKP sensor is disconnected. Measure voltage between ground and Gray/Black wire at CKP sensor harness connector. If voltage is less than 4.5 volts, go to next step. If voltage is 4.5-5.5 volts, go to step 17. If voltage is 7.5-8.5 volts, Gray/Black wire is shorted to 5-volt to 8-volt supply circuit (Orange wire). Repair wiring as necessary. If voltage is more than 8.5 volts, repair short to voltage in Gray/Black wire.
11. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Gray/Black wire between CKP sensor harness connector and terminal No. 32 at PCM C1 harness connector. see scheme 6 If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Black wire.
12. Turn ignition off. Measure resistance between ground and Gray/Black wire at CKP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Gray/Black wire.
13. Measure resistance between Gray/Black wire and Black/Light Blue wire at CKP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Orange wire is shorted to Black/Light Blue wire. Repair wiring as necessary.
14. Ensure ignition is off. Reconnect PCM connectors. Measure resistance between ground and Black/Light Blue wire at CKP sensor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 20.
15. Remove CKP sensor. Inspect tone wheel/flexplate for damage. Check slotted areas on tone wheel/flexplate for damage or any foreign debris. Ensure tone wheel/flexplate turns when engine is cranked. Repair or replace tone wheel/flexplate as necessary. If tone wheel/flexplate is okay, go to next step.
16. At this time, PCM is assumed to be defective. Replace PCM.
17. Turn ignition off. Measure resistance between ground and Black/Light Blue wire at CKP sensor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 20.
18. Remove CKP sensor. Inspect tone wheel/flexplate for damage. Check slotted areas on tone wheel/flexplate for damage or any foreign debris. Ensure tone wheel/flexplate turns when engine is cranked. Repair or replace tone wheel/flexplate as necessary. If tone wheel/flexplate is okay, go to next step.
19. At this time, CKP sensor is assumed to be defective. Replace CKP sensor.
20. Remove CKP sensor. Inspect tone wheel/flexplate for damage. Check slotted areas on tone wheel/flexplate for damage or any foreign debris. Ensure tone wheel/flexplate turns when engine is cranked. Repair or replace tone wheel/flexplate as necessary. If tone wheel/flexplate is okay, go to next step.
21. Measure resistance of Black/Light Blue wire between CKP sensor harness connector and terminal No. 43 at PCM C2 harness connector. see scheme 6 If resistance is less than 5 ohms, go to next step. It resistance is 5 ohms or more, repair open in Black/Light Blue wire.
22. At this time, PCM is assumed to be defective. Replace PCM.
23. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, go to next step. NOTE: The following step checks for a intermittent fault in the CKP sensor signal circuit.
24. Backprobe lab scope lead to terminal No. 32 (Gray/Black wire) at PCM C1 harness connector. see scheme 6 Start engine and allow it to idle. Wiggle wiring harness from CKP sensor to PCM while observing lab scope pattern. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 CKP sensor is mounted to passenger side of transaxle housing, above the differential housing. (Scheme 1) If any irregularities in lab scope pattern occurs while wiggling wiring harness, check wiring harness where wiggling caused irregularity in lab scope pattern. Repair wiring as necessary. If wiring harness is okay, replace CKP sensor. If there are no irregularities in lab scope pattern while wiggling wiring harness, go to next step. NOTE: The following step checks for any pulses generated on lab scope by the CMP sensor. With ignition on, no CMP sensor pulses should be generated.
25. Turn ignition off. Disconnect lab scope. Backprobe lab scope lead to terminal No. 33 (Tan/Yellow wire) at PCM C1 harness connector. While observing lab scope pattern, turn ignition on. Do not start engine. If any pulses were generated when ignition was turned on, replace CMP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If no pulses were generated, no problem is indicated at this time. Test is complete.

Knock sensor No. 1 circuit is monitored with ignition on and engine running. DTC will set in Powertrain Control Module (PCM) when knock sensor circuit voltage falls to less than a minimum value at idle or deceleration. The minimum value is from a look-up table internal to PCM and is based on engine RPM. DTC will also set if sensor output voltage is more than 5 volts. Possible cause for DTC to set are: defective PCM, defective connectors or defective wiring.

Cam signal is monitored with engine cranking or running. DTC will set in Powertrain Control Module (PCM) memory when PCM senses at least 5 seconds has past with Crankshaft Position (CKP) sensor signals present but no signals from Camshaft Position (CMP) sensor. Possible causes for DTC to set are: defective tone wheel/pulse ring, defective CMP sensor, defective PCM, defective connectors or defective wiring.

Scheme 2

1. Turn ignition on. Using scan tool, select INPUTS/OUTPUTS and read current CMP state while cranking engine. If scan tool displays current CMP state PRESENT, go to next step. If scan tool does not display current CMP state PRESENT, go to step 20. If current CKP count does not change while attempting to start engine, go to next step.
2. Turn engine off. Disconnect CMP sensor connector. On 2.7L, CMP sensor is mounted in front of timing cover. On 3.2L and 3.5L, CMP sensor is mounted in timing belt cover, above left camshaft sprocket. On all models, visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. If connector is okay, turn ignition on. Measure voltage between ground and terminal No. 1 (Orange wire) at CMP sensor harness connector. (Scheme 2) If voltage is less than 7.5 volts, go to next step. If voltage is 7.5-8.5 volts, go to step 10. If voltage is more than 8.5 volts, repair short to voltage in Orange wire.
3. Turn ignition off. Ensure CMP sensor is still disconnected. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Orange wire between terminals No. 1 at CMP sensor harness connector and No. 44 at PCM C2 harness connector. see scheme 6and (Scheme 2). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange wire.
4. Measure resistance between ground and terminal No. 1 (Orange wire) at CMP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Orange wire between PCM and CMP sensor.
5. Measure resistance between terminals No. 2 (Black/Light Blue wire) and No. 1 (Orange wire) at CMP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Orange wire is shorted to Black/Light Blue wire. Repair wiring as necessary.
6. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and terminal No. 3 (Tan/Yellow wire) at CMP sensor harness connector. If voltage is less than 4.5 volts, go to step 11. If voltage is 4.5-5.5 volts, go to next step. If voltage is 7.5-8.5 volts, Tan/Yellow wire is shorted to 5-volt to 8-volt supply circuit (Orange wire). Repair wiring as necessary. If voltage is more than 8.5 volts, repair short to voltage in Tan/Yellow wire.
7. Turn ignition off. Measure resistance between ground and terminal No. 2 (Black/Light Blue wire) at CMP sensor harness connector. If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, go to step 18.
8. Remove CMP sensor. Inspect tone wheel/pulse ring for damage. Ensure tone wheel/pulse ring turns when engine is cranked. Repair or replace tone wheel/pulse ring as necessary. If tone wheel/pulse ring is okay, go to next step.
9. At this time, PCM is assumed to be defective. Replace PCM.
10. Turn ignition on. Measure voltage between ground and terminal No. 3 (Tan/Yellow wire) at CMP sensor harness connector. If voltage is less than 4.5 volts, go to next step. If voltage is 4.5-5.5 volts, go step 15. If voltage is 7.5-8.5 volts, Tan/Yellow wire is shorted to 5-volt to 8-volt supply circuit (Orange wire). Repair wiring as necessary. If voltage is more than 8.5 volts, repair short to voltage in Tan/Yellow wire.
11. Turn ignition off. Ensure CMP sensor is still disconnected. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Tan/Yellow wire between terminals No. 3 at CMP sensor harness connector and No. 33 at PCM C1 harness connector. see scheme 6and (Scheme 2). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Yellow wire.
12. Measure resistance between ground and terminal No. 3 (Tan/Yellow wire) at CMP sensor connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Tan/Yellow wire between PCM and CMP sensor.
13. Measure resistance between terminals No. 2 (Black/Light Blue wire) and No. 3 (Tan/Yellow wire) at CMP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Tan/Yellow wire is shorted to Black/Light Blue wire. Repair wiring as necessary.
14. At this time, PCM is assumed to be defective. Replace PCM.
15. Turn ignition off. Ensure CMP sensor is disconnected. Measure resistance between ground and terminal No. 2 (Black/Light Blue wire) at CMP sensor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 18.
16. Remove CMP sensor. Inspect tone wheel/pulse ring for damage. Ensure tone wheel/pulse ring turns when engine is cranked. Repair or replace tone wheel/pulse ring as necessary. If tone wheel/pulse ring is okay, go to next step.
17. At this time, CMP sensor is assumed to be defective. Replace CMP sensor.
18. Ensure ignition is off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Black/Light Blue wire between terminals No. 2 at CMP sensor harness connector and No. 43 at PCM C2 harness connector. see scheme 6and (Scheme 2). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
19. At this time, PCM is assumed to be defective. Replace PCM.
20. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, go to next step. NOTE: The following step checks for any pulses generated on lab scope by the CKP sensor. With ignition on, no CKP sensor pulses should be generated.
21. Backprobe lab scope lead to terminal No. 32 (Gray/Black wire) at PCM C1 harness connector. see scheme 6 Observe lab scope screen and turn ignition on. If any pulses were generated when ignition was turned on, replace CKP sensor. If no pulses were generated, go to next step. NOTE: The following step checks for a intermittent fault in the CMP sensor signal circuit.
22. Turn ignition off. Disconnect lab scope. Backprobe lab scope lead to terminal No. 33 (Tan/Yellow wire) at PCM C1 harness connector. see scheme 6 Start engine. Wiggle wiring harness from CMP sensor to PCM while observing lab scope pattern. If any irregularities in lab scope pattern occurs while wiggling wiring harness, check wiring harness where wiggling caused irregularity in lab scope pattern. Repair wiring as necessary. If wiring harness is okay, replace CMP sensor. If there are no irregularities in lab scope pattern while wiggling wiring harness, no problem is indicated at this time. Test is complete.

Ignition coil primary circuit is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC will set in Powertrain Control Module (PCM) memory when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0351 takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes for DTC to set are: defective ignition coil No. 1, defective PCM, defective connectors or defective wiring.

Ignition coil primary circuit is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC will set in Powertrain Control Module (PCM) memory when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0352 takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes for DTC to set are: defective ignition coil No. 2, defective PCM, defective connectors or defective wiring.

Ignition coil primary circuit is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC will set in Powertrain Control Module (PCM) memory when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0353 takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes for DTC to set are: defective ignition coil No. 3, defective PCM, defective connectors or defective wiring.

Ignition coil primary circuit is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC will set in Powertrain Control Module (PCM) memory when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0354 takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes for DTC to set are: defective ignition coil No. 4, defective PCM, defective connectors or defective wiring.

Ignition coil primary circuit is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC will set in Powertrain Control Module (PCM) memory when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0355 takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes for DTC to set are: defective ignition coil No. 5, defective PCM, defective connectors or defective wiring.

Ignition coil primary circuit is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC will set in Powertrain Control Module (PCM) memory when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0356 takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes for DTC to set are: defective ignition coil No. 6, defective PCM, defective connectors or defective wiring.

EGR system is monitored when engine temperature is 180°F (82°C), ambient temperature is more than 0°F (-18°C), engine is in closed loop, oxygen sensor is operational, engine is under a steady load with throttle open and oxygen sensor is not at or near its limits. DTC will set in Powertrain Control Module (PCM) memory when PCM detects too little or too much of a change in oxygen sensor output signal when EGR is turned off then on. Possible causes for DTC to set are: defective EGR valve, defective PCM, defective connectors or defective wiring.

EGR system is monitored when engine is running and battery voltage is more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when EGR solenoid control circuit is not in the expected state when actuated by PCM. Possible causes for DTC to set are: defective EGR solenoid, defective PCM, defective connectors or defective wiring.

EGR system is monitored when engine is running and battery voltage is more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when EGR flow or valve movement is not as expected. Possible causes for DTC to set are: defective EGR sensor, defective PCM, defective connectors or defective wiring.

EGR position sensor voltage is monitored when ignition is on and battery voltage is more than 10 volts. DTC will set in Powertrain Control Module (PCM) memory when EGR position sensor voltage is less than .157 volt. Possible causes for DTC to set are: defective EGR position sensor, defective PCM, defective connectors or defective wiring.

EGR position sensor voltage is monitored when ignition is on and battery voltage is more than 10 volts. DTC will set in Powertrain Control Module (PCM) memory when EGR position sensor voltage is less than .157 volt. Possible causes for DTC to set are: defective EGR position sensor, defective PCM, defective connectors or defective wiring.

Note. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold. 1/1 catalytic converter is located in right exhaust pipe.

Catalytic converter efficiency is monitored after engine warms up to 147°F (63.8°C), throttle has been open for 180 seconds at vehicle speed more than 20 MPH, with engine speed at 1200-1700 RPM and MAP vacuum 15-21 in. Hg. DTC will set in Powertrain Control Module (PCM) memory when PCM senses catalyst efficiency deteriorated to a predetermined value. Possible causes for DTC to set are: exhaust leak, engine mechanical problem, defective 1/1 catalytic converter or upstream Heated Oxygen Sensor (HO2S) is older than downstream HO2S.

Catalytic converter efficiency is monitored after engine warms up to 147°F (63.8°C), throttle has been open for 180 seconds at vehicle speed more than 20 MPH, with engine speed at 1200-1700 RPM and MAP vacuum 15-21 in. Hg. DTC will set in Powertrain Control Module (PCM) memory when PCM senses catalyst efficiency deteriorated to a predetermined value. Possible causes for DTC to set are: exhaust leak, engine mechanical problem, defective 2/1 catalytic converter or upstream Heated Oxygen Sensor (HO2S) is older than downstream HO2S.

EVAP purge flow is monitored after engine warms up to more than 170°F (76.7°C) in closed loop mode, at idle for 2 minutes, Manifold Absolute Pressure (MAP) at less than 15.7 in. Hg, and altitude at less than 8000 feet. DTC will set in Powertrain Control Module (PCM) memory when PCM senses no airflow through Evaporative Emission (EVAP) system. Possible causes for DTC to set are: EVAP purge solenoid contaminated, defective EVAP purge solenoid or damaged or plugged vacuum hoses.

EVAP leak monitor is monitored immediately after a cold start, with ambient temperature 40-90°F (4.4-32.2°C) and engine coolant temperature within 10°F of ambient temperature. DTC P0442 will set in Powertrain Control Module (PCM) memory when PCM senses a leak of .040-.080" (.01-.02 mm) in Evaporative Emission (EVAP) system. DTC P0455 will set when PCM senses a leak bigger than .080" (.02 mm) in EVAP system. Possible causes for DTC to set are: leaking EVAP system component or intermittent Leak Detection Pump (LDP) monitor failure.

EVAP purge solenoid is monitored immediately after ignition is turned on with battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory if actual state of EVAP purge solenoid does not match the intended state when requested to operate by PCM. Possible causes for DTC to set are: defective EVAP purge solenoid, defective PCM, defective connectors or defective wiring.

Fuel level is monitored with engine running and fuel level at less than 15 percent or more than 85 percent capacity. DTC will set in Powertrain Control Module (PCM) memory when PCM senses low fuel for more than 120 miles, or high fuel level that does not change by at least 10 percent for more than 100 miles. Fuel level sending unit may also be referred to as fuel level sensor. Possible causes for DTC to set are: defective fuel level sensor or damaged fuel tank.

Vehicle speed sensor signal is monitored with engine running, transaxle in Drive, brakes not applied and engine speed at more than 1500 RPM. DTC will set in Powertrain Control Module (PCM) memory when PCM does not receive a vehicle speed signal from Transmission Control Module (TCM) for more than 11 seconds for 2 consecutive trips.

Idle Air Control (IAC) motor voltage is monitored immediately after ignition is turned on with battery voltage at more than 11.5 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses a short to ground or battery voltage on any of the 4 IAC driver circuits while IAC motor is active. Possible causes for DTC to set are: defective IAC motor, defective PCM, defective connector or defective wiring.

Scheme 3

1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to next step. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", go to step 22.
2. Start engine and allow it to idle. Disconnect IAC motor connector. Measure voltage between ground and terminal No. 1 (Gray/Red wire) at IAC motor harness connector. (Scheme 3) If voltage changes to more than 5 volts at any time, go to next step. If voltage does not change to more than 5 volts at any time, go to step 19.
3. With engine still idling, measure voltage between ground and terminal No. 2 (Yellow/Black wire) at IAC motor harness connector. If voltage changes to more than 5 volts at any time, go to next step. If voltage does not change to more than 5 volts at any time, go to step 16.
4. With engine still idling, measure voltage between ground and terminal No. 3 (Brown/White wire) at IAC motor harness connector. If voltage changes to more than 5 volts at any time, go to next step. If voltage does not change to more than 5 volts at any time, go to step 13.
5. With engine still idling, measure voltage between ground and terminal No. 4 (Violet/Black wire) at IAC motor harness connector. If voltage changes to more than 5 volts at any time, go to next step. If voltage does not change to more than 5 volts at any time, go to step 10.
6. Turn ignition off. Ensure IAC motor is disconnected. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance between terminal No. 1 (Gray/Red wire) and terminals No. 2 (Yellow/Black), No. 3 (Brown/White wire) and No. 4 (Violet/Black wire) at IAC motor harness connector. (Scheme 3) If all resistance readings are 5 ohms or more, go to next step. If any resistance reading is less than 5 ohms, Gray/Red wire is shorted to wire with resistance less than 5 ohms. Repair wiring as necessary.
7. Measure resistance between terminal No. 2 (Yellow/Black wire) and terminals No. 3 (Brown/White wire) and No. 4 (Violet/Black wire) at IAC motor harness connector. If any resistance reading is less than 5 ohms, Yellow/Black wire is shorted to wire with resistance less than 5 ohms. Repair wiring as necessary. If all resistance readings are 5 ohms or more, go to next step.
8. Measure resistance between terminals No. 3 (Brown/White wire) and No. 4 (Violet/Black wire) at IAC motor harness connector. If resistance is less than 5 ohms, Brown/White and Violet/Black wires are shorted together. Repair wiring as necessary. If all resistance is 5 ohms or more, go to next step.
9. At this time, IAC motor is assumed to be defective. Replace IAC motor.
10. Turn ignition off. Ensure IAC motor is disconnected. Turn ignition off. Ensure IAC motor is disconnected. Disconnect PCM connectors. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Violet/Black wire between terminals No. 4 at IAC motor harness connector and No. 58 at PCM C2 harness connector. see scheme 6and (Scheme 3). If resistance is 5 ohms or more, repair open in Violet/Black wire. If resistance is less than 5 ohms, go to next step.
11. Measure resistance between ground and terminal No. 4 (Violet/Black wire) at IAC motor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Violet/Black wire between IAC motor and PCM.
12. At this time, PCM is assumed to be defective. Replace PCM.
13. Turn ignition off. Ensure IAC motor is disconnected. Disconnect PCM connectors. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Brown/White wire between terminals No. 3 at IAC motor harness connector and terminal No. 48 at PCM C2 harness connector. see scheme 6and (Scheme 3). If resistance is 5 ohms or more, repair open in Brown/White wire. If resistance is less than 5 ohms, go to next step.
14. Measure resistance between ground and terminal No. 3 (Brown/White wire) at IAC motor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown/White wire between IAC motor and PCM.
15. At this time, PCM is assumed to be defective. Replace PCM.
16. Turn ignition off. Ensure IAC motor is disconnected. Disconnect PCM connectors. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Yellow/Black wire between terminals No. 2 at IAC motor harness connector and No. 49 at PCM C2 harness connector. see scheme 6and (Scheme 3). If resistance is 5 ohms or more, repair open in Yellow/Black wire. If resistance is less than 5 ohms, go to next step.
17. Measure resistance between ground and terminal No. 2 (Yellow/Black wire) at IAC motor connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Yellow/Black wire between IAC motor and PCM.
18. At this time, PCM is assumed to be defective. Replace PCM.
19. Turn ignition off. Ensure IAC motor is disconnected. Disconnect PCM connectors. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Gray/Red wire between terminals No. 1 at IAC motor harness connector and No. 57 at PCM C2 harness connector. see scheme 6and (Scheme 3). If resistance is 5 ohms or more, repair open in Gray/Red wire. If resistance is less than 5 ohms, replace PCM.
20. Measure resistance between ground and terminal No. 1 (Gray/Red wire) at IAC motor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Gray/Red wire between IAC motor and PCM.
21. At this time, PCM is assumed to be defective. Replace PCM.
22. Visually inspect wiring harness and connectors between IAC motor and PCM. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors and go to next step.
23. Start engine and allow it to idle. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. While monitoring IAC motor operation, wiggle wiring harness from IAC motor to PCM. If IAC motor stops operating at any time while wiggling wiring harness, repair wiring harness where wiggling caused IAC motor to stop operating. If IAC motor does not stop operating at any time while wiggling wiring harness, no problem is indicated at this time. Test is complete.

Power steering pressure switch sense circuit is monitored with engine running. DTC will set in Powertrain Control Module (PCM) memory when PCM senses open power steering pressure switch with vehicle speed at more than 40 MPH for more than 30 seconds. Possible causes for DTC to set are: defective power steering pressure switch, defective PCM, defective connector or defective wiring.

Communication between processors over internal BUS is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when PCM senses bus communication failure between processors. Possible cause for DTC to set is: defective PCM.

Internal controller operation is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when PCM senses internal checksum for software failed and does not match calculated value. Possible cause for DTC to set is: defective PCM.

Generator field driver circuit is monitored with engine running. DTC will set in Powertrain Control Module (PCM) memory when PCM tries to regulate generator field with no result during monitoring. Possible cause for DTC to set is: defective generator, defective PCM, defective connector or defective wiring.

A/C clutch relay voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) when PCM senses an open or short in A/C clutch relay control circuit. Possible causes for DTC to set are: defective A/C clutch relay, defective PCM, defective connector or defective wiring.

Scheme 4

Scheme 5

1. Turn ignition on. Using scan tool, actuate A/C clutch relay. Locate A/C clutch relay in Power Distribution Center (PDC). (Scheme 4) If A/C clutch relay is clicking, go to next step. If A/C clutch relay is not clicking, go to step 4.
2. Inspect all related wiring and connectors and repair as necessary. Repair wiring and connectors as necessary. If no problems were found with wiring and connectors, go to next step.
3. With A/C clutch relay still actuated, wiggle wiring harness from A/C clutch relay to PCM. If wiggling interrupted A/C clutch relay actuation, repair wiring harness as necessary where wiggling caused problem to appear. If wiggling did not interrupt A/C clutch relay actuation, no problem is indicated at this time. Test is complete.
4. Turn ignition off. Disconnect A/C clutch relay. Turn ignition on. Measure voltage between ground and terminal "A" (Light Green/Black wire) at A/C clutch relay socket in PDC. (Scheme 4) If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, check for open in Light Green/Black wire between A/C clutch relay socket and junction block. Junction block is located behind end cover on left side of instrument panel. Repair wiring as necessary. If wiring is okay, check fuse No. 21 (10-amp) in junction block. Replace fuse as necessary.
5. Using an ohmmeter, check resistance between terminals "A" and "C" at A/C clutch relay. (Scheme 5) If resistance is 50-90 ohms, go to next step. If resistance is not 50-90 ohms, replace A/C clutch relay.
6. Ensure ignition is off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Dark Blue/Orange wire between terminal "C" at A/C clutch relay socket in PDC and terminal No. 64 at PCM C2 harness connector. see scheme 6and (Scheme 4). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Orange wire.
7. Measure resistance between ground and terminal "C" (Dark Blue/Orange wire) at A/C clutch relay socket in PDC. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire between A/C clutch relay and PCM.
8. At this time, PCM is assumed to be defective. Replace PCM.

Electronic Automatic Transaxle (EATX) controller is monitored for DTCs when ignition is on and engine is running. EATX controller may also be referred to as Transmission Control Module (TCM). DTC will set in Powertrain Control Module (PCM) memory if any DTC is set in the TCM. Possible cause for DTC to set is: TCM DTC is present in PCM.

Brake switch sense circuit is monitored when engine is running. Powertrain Control Module (PCM) expects to see signal to be high for 16 cycles while monitoring brake switch signal during acceleration and deceleration modes. DTC may be stored in PCM if improper brakelight switch signal is received. Possible causes for DTC to set are: defective brakelight switch, defective PCM, or defective connectors or wiring.

1/1 Heated Oxygen Sensor (HO2S) catalyst monitor is monitored with engine running, coolant temperature more than 170°F (76.7°C), open throttle, vehicle speed steadily increased to more than 18 MPH but less than 55 MPH, and light engine load exists for at least 5 minutes. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes for DTC to set are: oil or coolant consumption, defective 1/1 HO2S, defective connector or defective wiring.

2/1 Heated Oxygen Sensor (HO2S) catalyst monitor is monitored with engine running, coolant temperature more than 170°F (76.7°C), open throttle, vehicle speed steadily increased to more than 18 MPH but less than 55 MPH, and light engine load exists for at least 5 minutes. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes for DTC to set are: oil or coolant consumption, defective 2/1 HO2S, defective connector or defective wiring.

Fuel pump relay voltage is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses an open or short condition in fuel pump relay control circuit. Possible causes for DTC to set are: defective fuel pump relay, defective PCM, defective connector or defective wiring.

Scheme 6

1. Turn ignition on. Using scan tool, actuate fuel pump relay. Fuel pump relay is located in Power Distribution Center (PDC). PDC is located on left side of engine compartment. see scheme 2 If fuel pump relay clicks, go to next step. If fuel pump relay does not click, go to step 4.
2. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, go to next step.
3. Ensure ignition is on. Wiggle wiring harness from fuel pump relay to Powertrain Control Module (PCM) while actuating fuel pump relay. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 If fuel pump relay stops clicking at any time while wiggling wiring harness, repair wiring harness where wiggling caused fuel pump relay to stop clicking. If fuel pump relay does not stop clicking at any time while wiggling wiring harness, go to next step.
4. Remove fuel pump relay from PDC. Turn ignition on. Measure voltage between ground and terminal "B" (Red wire) at fuel pump relay socket in PDC. (Scheme 6) If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, Check for open in fused ignition switch output circuit (Red wire) between fuel pump relay and PDC. Repair wiring as necessary. Also check fuse "G" (40-amp) in PDC. Replace fuse as necessary.
5. Using an ohmmeter, check resistance between terminals "A" and "C" at fuel pump relay. (Scheme 5) If resistance is 50-90 ohms, go to next step. If resistance is not 50-90 ohms, replace fuel pump relay.
6. Ensure ignition is off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Brown wire between terminal "C" at fuel pump relay socket in PDC and terminal No. 74 at PCM C2 harness connector. see scheme 6and (Scheme 6). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown wire between fuel pump relay and PCM.
7. Measure resistance between ground and terminal No. 74 (Brown wire) at PCM C2 harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown wire between fuel pump relay and PCM.
8. At this time, PCM is assumed to be defective. Replace PCM.

Short Runner Valve (SRV) solenoid circuit voltage is monitored with ignition on and battery voltage more than 10.4 volts. To maximize engine performance, SRV system operates under Wide Open Throttle (WOT) conditions with engine speed at more than 5000 RPM. When actuated by PCM, SRV solenoid is actuated and allows mechanical linkage to redirect airflow to 6 short runners. DTC will set in Powertrain Control Module (PCM) memory when PCM senses short runner valve solenoid circuit is not in expected state. Possible causes for DTC to set are: defective SRV solenoid, defective PCM, defective connector or defective wiring.

Manifold Tune Valve (MTV) solenoid circuit voltage is monitored with engine running. Powertrain Control Module (PCM) actuates MTV solenoid at Wide Open Throttle (WOT) with engine speed at less than 3008 RPM. MTV solenoid controls a intake manifold mounted servo. DTC will set in Powertrain Control Module (PCM) memory when PCM senses MTV solenoid circuit is not in expected state. Possible causes for DTC to set are: defective MTV solenoid, defective PCM, defective connector or defective wiring.

Engine speed is monitored with engine idling, transmission in Drive, and no Manifold Absolute Pressure (MAP) or Throttle Position (TP) sensor DTCs present. DTC will set in Powertrain Control Module (PCM) memory when PCM senses engine speed at more than 200 RPM more or 100 RPM less than target idle speed for 14 seconds. Three separate failures are required to set a bad trip. One bad trip is required to set DTC. Possible causes for DTC to set are: vacuum leak, defective throttle body, throttle plate or linkage improperly positioned, defective connectors or defective wiring.

Note. Vehicles equipped with a 2.7L engine are equipped with a Manifold Absolute Pressure (MAP) sensor. Vehicles equipped with a 3.2L and 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as MAP sensor.

MAP sensor signal is monitored with engine speed 400-1500 RPM with throttle plate closed. DTC will set in Powertrain Control Module (PCM) memory when PCM senses too small of a difference between barometric pressure (with ignition on) and manifold vacuum (with engine running). Possible causes for DTC to set are: defective MAP sensor, defective PCM, defective connectors or defective wiring.

Manifold Absolute Pressure (MAP) sensor and Throttle Position (TP) sensor signals are monitored with engine running. DTC will set in Powertrain Control Module (PCM) memory when PCM senses MAP sensor signal does not correlate to TP sensor signal. Possible causes for DTC to set are: vacuum leak, defective MAP sensor or defective TP sensor. Most likely cause of DTC to set is a large vacuum leak.

Auto Shutdown (ASD) relay control circuit is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses a short or open in ASD relay control circuit. Possible causes for DTC to set are: defective ASD relay, defective PCM, defective connectors or defective wiring.

Auto Shutdown (ASD) relay output voltage is monitored with engine running, engine speed more than 400 RPM and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when no voltage is sensed at PCM when ASD relay is energized. Possible causes for DTC to set are: defective ASD relay, defective PCM, defective connectors or defective wiring.

Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor signals are monitored with engine running or cranking. DTC will set in Powertrain Control Module (PCM) memory when PCM senses FAILURE counter reaches 96 failures for 2 consecutive trips. Possible causes for DTC to set are: Crankshaft Position (CKP) sensor improperly installed, defective CKP sensor, defective Camshaft Position (CMP) sensor, defective PCM, defective tone wheel/flexplate, defective connectors or defective wiring.

Misfire adaptive numerator is monitored under closed throttle deceleration, with A/C off, engine coolant temperature more than 75°F (23.9°C) and more than 50 seconds after engine start. DTC will set in Powertrain Control Module (PCM) memory when PCM senses one of Crankshaft Position (CKP) sensor target windows has more than 2.86 percent variance from CKP sensor reference window. Possible causes for DTC to set are: improperly installed CKP sensor, defective CKP sensor, defective flywheel/flexplate, defective connectors or defective wiring.

Battery temperature sensor voltage is monitored when ignition is on. Battery temperature sensor is integral to PCM. . DTC will set in PCM memory if battery temperature sensor voltage is less than .1 volt or more than 4.9 volts for more than 3.2 seconds. Possible cause for DTC to set is: defective PCM.

EVAP leak monitor is monitored after cold start with ambient temperature of 40-90°F (4.4-32°C) and coolant temperature within 10°F (-12°C) of ambient temperature. If PCM detects a pinched hose, DTC will not set until EVAP monitor performs system test. If system test fails, DTC will set. DTC will set in Powertrain Control Module (PCM) memory when EVAP monitor senses no airflow through EVAP system. Possible causes for DTC to set are: blocked fuel tank-to-EVAP canister hose, blocked Leak Detection Pump (LDP) hose, pinched EVAP purge solenoid-to-EVAP canister hose, blocked LDP or blocked EVAP canister.

Radiator high speed fan relay voltage is monitored when ignition is on and battery voltage is more than 10 volts. DTC will set in PCM memory if PCM detects an open or shorted condition in high speed radiator fan control relay circuit. Possible causes for DTC to set are: defective high speed radiator fan relay, defective PCM, or defective connectors or wiring.

Scheme 7

1. Turn ignition on. Using scan tool, actuate high speed radiator fan relay. Locate high speed radiator fan relay. High speed radiator fan relay is located in Power Distribution Center (PDC). (Scheme 7) If high speed radiator fan relay cycles on and off, go to next step. If high speed radiator fan relay does not cycle on and off, stop relay actuation and go to step 4.
2. Ensure high speed radiator fan relay is still actuated. Wiggle wiring harness from high speed radiator fan relay PCM. PCM is located on left side of engine compartment, between PDC and Transmission Control Module (TCM). see scheme 2 If high speed radiator fan relay actuation is interrupted, repair connector or wiring harness where wiggling caused interruption. If no problems were found, go to next step.
3. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. No problem is indicated at this time. Test is complete
4. Turn ignition off. Remove high speed radiator fan relay from PDC. Turn ignition on. Measure voltage between ground and terminal "A" (Light Green/Black wire) at high speed radiator fan relay socket in PDC. (Scheme 7) If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, check for open in Light Green/Black wire between high speed radiator fan relay and junction block. Junction block is located behind end cover on left side of instrument panel. PDC. Repair wiring as necessary. Also check fuse No. 21 (10-amp) in junction block. Replace fuse as necessary.
5. Turn ignition off. Disconnect PCM connectors. Measure resistance of Dark Blue/Light Green wire between terminal "C" at high speed radiator fan relay socket in PDC and terminal No. 69 at PCM C2 harness connector. see scheme 6and (Scheme 7). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Light Green wire.
6. Measure resistance between ground and terminal No. 69 (Dark Blue/Light Green wire) at PCM C2 harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Light Green wire.
7. Install high speed radiator fan relay. Turn ignition of. Connect one end of a jumper wire to terminal No. 69 (Dark Blue/Light Green wire) at PCM C2 harness connector. see scheme 6 Momentarily connect other end of jumper wire to ground. If high speed radiator fan relay actuates (click noise heard), go to next step. If high speed radiator fan relay does not actuate, replace high speed radiator fan relay.
8. At this time, PCM is assumed to be defective. Replace PCM.

Radiator low speed fan relay voltage is monitored when ignition is on, battery voltage is more than 10 volts. DTC will set in PCM memory if PCM detects an open or shorted condition in low speed radiator fan control relay circuit. Possible causes for DTC to set are: defective low speed radiator fan relay, defective PCM, or defective connectors or wiring.

Scheme 8

1. Turn ignition on. Using scan tool, actuate low speed radiator fan relay. Locate low speed radiator fan relay in Power Distribution Center (PDC). (Scheme 8) If low speed radiator fan relay cycles on and off, go to next step. If low speed radiator fan relay does not cycle on and off, stop relay actuation and go to step 4.
2. Ensure low speed radiator fan relay is still actuated. Wiggle wiring harness from low speed radiator fan relay PCM. PCM is located on left side of engine compartment, between PDC and Transmission Control Module (TCM). see scheme 2 If low speed radiator fan relay actuation is interrupted, repair connector or wiring harness where wiggling caused interruption. If no problems were found, go to next step.
3. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. No problem is indicated at this time. Test is complete.
4. Turn ignition off. Remove low speed radiator fan relay from PDC. Turn ignition on. Measure voltage between ground and terminal "A" (Light Green/Black wire) at low speed radiator fan relay socket in PDC. (Scheme 8) If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, check for open in Light Green/Black wire between low speed radiator fan relay and junction block. Junction block is located behind end cover on left side of instrument panel. Repair wiring as necessary. Also check fuse No. 21 (10-amp) in junction block. Replace fuse as necessary.
5. Turn ignition off. Disconnect PCM connectors. Measure resistance of Dark Blue/Pink wire between terminal "C" at low speed radiator fan relay socket in PDC and terminal No. 55 at PCM C2 harness connector. see scheme 6and (Scheme 8). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Pink wire.
6. Measure resistance between ground and terminal No. 55 (Dark Blue/Pink wire) at PCM C2 harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire.
7. Install low speed radiator fan relay. Turn ignition of. Connect one end of a jumper wire to terminal No. 55 (Dark Blue/Pink wire) at PCM C2 harness connector. see scheme 6 Momentarily connect other end of jumper wire to ground. If low speed radiator fan relay actuates (click noise heard), go to next step. If low speed radiator fan relay does not actuate, replace low speed radiator fan relay.
8. At this time, PCM is assumed to be defective. Replace PCM.

Note. Ambient/battery temperature sensor is may also be referred to as ambient temperature sensor.

Ambient temperature sensor voltage is monitored with ignition on. Body Control Module (BCM) transmits temperature data to PCM by means of bus circuit. DTC will set in Powertrain Control Module (PCM) memory when PCM senses ambient temperature sensor voltage is abnormally low or high. Possible causes for DTC to set are: defective ambient temperature sensor, defective BCM, defective connector or defective wiring.

Scheme 9

1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", go to next step. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to step 11.
2. Remove ambient temperature sensor. Ambient temperature sensor is located on bottom of upper radiator support and may be difficult to access. (Scheme 9) Using an ohmmeter, measure resistance of ambient temperature sensor. See «AMBIENT TEMPERATURE SENSOR RESISTANCE»(ref-4768-S22502256562000072400000) table. If resistance is as specification, go to next step. If resistance is not as specification, replace ambient temperature sensor. AMBIENT TEMPERATURE SENSOR RESISTANCE Temperature °F (°C) Ohms 32 (0) 29,300-36,000 50 (10) 18,000-22,000 68 (20) 11,400-13,600 77 (25) 9100-10,800 86 (30) 7400-8700 104 (40) 4900-5700 122 (50) 3300-3800
3. Turn ignition off. Close all doors. When all lights are off, wait one minute. Measure resistance between ground and Dark Blue/Gray wire at ambient temperature sensor harness connector. If resistance is 30 ohms or more, go to next step. If resistance is less than 30 ohms, go to step 6.
4. Ensure ignition is off. Disconnect Body Control Module C3 connector. BCM is located on back of junction block at left end of instrument panel. (Scheme 11) Measure resistance of Dark Blue/Gray wire between ambient temperature sensor harness connector and terminal No. 10 at BCM C3 harness connector. (Scheme 10) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Gray wire.
5. At this time, BCM is assumed to be defective. Replace BCM. See REMOVAL & INSTALLATION in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
6. Ensure ignition is off and ambient temperature sensor is removed. Disconnect Body Control Module (BCM) C3 connector. BCM is located on back of junction block at left end of instrument panel. (Scheme 11) Measure resistance of Violet/Light Green wire between ambient temperature sensor harness connector and terminal No. 5 at BCM C3 harness connector. (Scheme 10) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/Light Green wire.
7. Measure resistance between ground and terminal No. 10 (Dark Blue/Gray wire) at BCM C3 harness connector. (Scheme 10) If resistance is less than 500 k/ohms, go to next step. If resistance is 500 k/ohms or more, repair partial short to ground in Dark Blue/Gray wire.
8. Measure resistance between ground and terminal No. 5 (Violet/Light Green wire) at BCM C3 harness connector. If resistance is 50 k/ohms or more, go to next step. If resistance is less than 50 k/ohms or more, repair partial short to ground in Violet/Light Green wire.
9. Measure resistance between Violet/Light Green wire and Dark Blue/Gray wire at ambient temperature sensor harness connector. If resistance is 50 k/ohms or more, go to next step. If resistance is less than 50 k/ohms, Violet/Light Green and Dark Blue/Gray wires are shorted together. Repair wiring as necessary.
10. At this time, BCM is assumed to be defective. Replace BCM. See REMOVAL & INSTALLATION in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
11. At this time, conditions required to set DTC are not present. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, test is complete. Check for any related technical service bulletins that may apply.

Scheme 10

Scheme 11

Leak Detection Pump (LDP) switch operation is monitored immediately after a cold start, with ambient temperature 40-90°F (4.4-32.2°C) and engine coolant temperature within 10°F (-12.2°C) of ambient temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses a change in switch state is not sensed when LDP solenoid is energized following an engine start. Possible causes for DTC to set are: defective LDP, defective PCM, defective connectors or defective wiring.

Leak Detection Pump (LDP) solenoid operation is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses state of solenoid does not change. Possible causes for DTC to set are: defective Leak Detection Pump (LDP), defective PCM, defective LDP solenoid, defective connectors or defective wiring.

The 5-volt supply circuit is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 5-volt supply circuit voltage is less than 3.5 seconds of 4 seconds. Possible causes for DTC to set are: defective Manifold Absolute Pressure (MAP) sensor, defective Throttle Position (TP) sensor, defective EGR solenoid, defective A/C pressure sensor, defective PCM, defective connectors or defective wiring.

Charging system voltage is monitored with engine running and engine speed more than 380 RPM. DTC will set in Powertrain Control Module (PCM) memory when PCM regulates generator field and there are no detected field problems, but output voltage does not decrease. Possible causes for DTC to set are: defective generator, defective PCM, defective connectors or defective wiring.

A/C pressure sensor signal voltage is monitored with engine running and A/C relay energized. DTC will set in Powertrain Control Module (PCM) memory when PCM senses A/C pressure sensor voltage is more than 4.9 volts. Possible causes for DTC to set are: defective A/C pressure sensor, defective PCM, defective connectors or defective wiring.

A/C pressure sensor signal voltage is monitored with engine running and A/C relay energized. DTC will set in Powertrain Control Module (PCM) memory when PCM senses A/C pressure sensor voltage is less than .5 volt. Possible causes for DTC to set are: defective A/C pressure sensor, defective PCM, defective connectors or defective wiring.

Charging system voltage is monitored when no other charging system DTCs exists, ignition is running and engine speed is more than 1152 RPM. DTC will set in Powertrain Control Module (PCM) memory when PCM senses voltage is one volt less than charging system goal for 25 seconds. The PCM senses the battery voltage, turns off field driver and senses battery voltage again. If voltages are the same, DTC will be stored in PCM. Possible causes for DTC to set are: defective PCM, defective connectors or wiring.

Transponder ID (in ignition key) is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when transponder ID read by Smart Key Immobilizer Module (SKIM) does not match any transponder ID's stored in SKIM memory. Possible causes for DTC to set are: invalid SKIM KEY, defective PCM, defective connector or defective wiring.

Smart Key Immobilizer Module (SKIM) bus is monitored with ignition on and continuously during engine operation. DTC will set in Powertrain Control Module (PCM) memory when SKIM status bus message was not received from the SKIM for 20 seconds. Possible causes for DTC to set are: invalid SKIM KEY, defective PCM, defective connector or defective wiring.

Instrument cluster bus is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when no messages are received from instrument cluster for 20 seconds. Possible causes for DTC to set are: intermittent fault in wiring harness or defective instrument cluster.

Messages from Body Control Module (BCM) are monitored with engine running, transaxle in Drive and battery voltage more than 10 volts. DTC will set in Powertrain Control Module (PCM) memory when no messages are received from BCM for 20 seconds. Possible causes for DTC to set are: intermittent fault in wiring harness or defective PCM.

Note. For circuit identification, see WIRING DIAGRAMS article. If replacing Powertrain Control Module (PCM), PCM must be reprogrammed. See PROGRAMMING . After each repair procedure has been completed, reconnect all components. Perform TEST VER-1 to ensure system is functioning properly.

DTC P1696 indicates PCM failure EEPROM write denied and is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when PCM's attempt to program/write to internal EEPROM fails. Possible cause for DTC to set is: defective PCM.

DTC P1697 indicates PCM failure EEPROM write denied and is monitored with ignition on. DTC will set in Powertrain Control Module (PCM) memory when PCM's attempt to program/write to internal EEPROM fails. Possible cause for DTC to set is: defective PCM.

Messages from Transmission Control Module (TCM) are monitored when engine is running, transaxle in Drive and battery voltage more than 10 volts. DTC will set in PCM memory if no bus messages are received from TCM for 10 seconds. Possible causes for DTC to set are: defective PCM, or defective connectors or wiring.

Park/Neutral Position (PNP) switch sense circuit is monitored when transaxle is in Park, Neutral or Drive and not in limp-in mode. DTC will set in Powertrain Control Module (PCM) memory if PCM detects an incorrect PNP switch state for a given mode of vehicle operation. Possible causes for DTC to set are: defective Transmission Range Sensor (TRS), defective PCM, or defective connectors or wiring.

TEST NTC-8: CHECKING IDLE AIR CONTROL MOTOR OPERATION

Note. For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-5 to ensure system is functioning properly. Ensure no DTCs are present before performing this test.

1. Start engine and let idle. Using scan tool, access ACTUATOR TESTS and set Idle Air Control (IAC) motor to 1400 RPM. If engine speed does not increase to 1400 RPM, go to next step. If engine speed increases to 1400 RPM, no problem is indicated at this time. Test is complete.
2. Turn ignition off. Disconnect IAC motor 4-pin connector. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, between resistance of each IAC driver circuit between IAC motor harness connector and PCM C2 harness connector. See «IAC DRIVER CIRCUIT IDENTIFICATION»(ref-4768-S03424401852000072400000) table. (Scheme 3)and see scheme 6. If all resistances are less than 5 ohms, replace IAC motor. If any resistance is 5 ohms or more, repair open in appropriate circuit.

IAC DRIVER CIRCUIT IDENTIFICATION

TEST NTC-9: CHECKING MAP SENSOR OPERATION

Note. For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-5 to ensure system is functioning properly. Ensure no DTCs are present before performing this test.

Turn engine off. Tee a vacuum gauge to a manifold vacuum source. Start engine. Allow engine to idle. If engine will not idle, maintain a constant RPM above idle. Using scan tool, read Manifold Absolute Pressure (MAP) sensor vacuum. If scan tool vacuum reading is within one in. Hg of vacuum gauge reading, MAP sensor is functioning properly. Test is complete. If scan tool vacuum reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor.

TEST NTC-11: CHECKING RADIATOR FAN OPERATION

Note. For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2 to ensure system is functioning properly. Ensure no DTCs are present before performing this test.

1. Turn ignition on. Using scan tool, actuate low speed radiator fan relay. Observe radiator fan. If radiator fan actuated, turn ignition off and go to step 8. If radiator fan did not actuate, go to next step.
2. Ensure low speed radiator fan relay is still actuated. Using a 12-volt test light connected to ground, backprobe terminal No. 3 (Dark Green wire) at radiator fan motor harness connector. (Scheme 12) If test light blinks on and off, go to next step. If test light does not blink on and off, go to step 5.
3. Turn ignition off. Disconnect radiator fan motor connector. Measure resistance between ground and terminal No. 1 (Black wire) at radiator fan motor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between radiator fan motor and ground. Ground is located near right horn.
4. At this time, radiator fan motor is assumed to be defective. Replace radiator fan motor.
5. Turn ignition off. Locate Power Distribution Center (PDC) on left side of engine compartment. see scheme 2 Remove low speed radiator fan relay from PDC. (Scheme 8) Using a test light connected to ground, probe terminal "B" (Gray wire) at low speed radiator fan relay socket in PDC. If test light illuminates, go to next step. If test light does not illuminate, check for open in Gray wire between low speed radiator fan relay and fuse "E" (40-amp) in PDC. Repair wiring as necessary. Also check fuse "E". Replace fuse as necessary.
6. Measure resistance of Dark Green wire between terminal No. 3 at radiator fan motor harness connector and terminal "D" at low speed radiator fan relay socket in PDC. (Scheme 8)and (Scheme 12). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green wire.
7. At this time, low speed radiator fan relay is assumed to be defective. Replace low speed radiator fan relay.
8. Turn ignition on. Using scan tool, actuate high speed radiator fan relay. Observe radiator fan. If radiator fan actuated, no problem is indicated at this time. Test is complete. If radiator fan did not actuate, go to next step.
9. Ensure high speed radiator fan relay is still actuated. Using a test light connected to ground, backprobe terminal No. 4 (Yellow wire) at radiator fan motor harness connector. (Scheme 12) If test light blinks on and off, go to next step. If test light does not blink on and off, go to step 12.
10. Turn ignition off. Disconnect radiator fan motor connector. Measure resistance between ground and terminal No. 2 (Black wire) at radiator fan motor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between radiator fan motor and ground. Ground is located near right horn.
11. At this time, radiator fan motor is assumed to be defective. Replace radiator fan motor.
12. Turn ignition off. Locate Power Distribution Center (PDC) on left side of engine compartment. see scheme 2 Remove high speed radiator fan relay from PDC. (Scheme 7) Using a test light connected to ground, probe terminal "B" (Red/Brown wire) at high speed radiator fan relay socket in PDC. If test light illuminates, go to next step. If test light does not illuminate, check for open in Red/Brown wire between high speed radiator fan relay and fuse "B" (30-amp) in PDC. Repair wiring as necessary. Also check fuse "B". Replace fuse as necessary.
13. Measure resistance of Yellow wire between terminal No. 4 at radiator fan motor harness connector and terminal "D" at high speed radiator fan relay socket in PDC. (Scheme 7)and (Scheme 12). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Yellow wire.
14. At this time, high speed radiator fan relay is assumed to be defective. Replace high speed radiator fan relay.

Scheme 12

TEST NTC-15: CHECKING THROTTLE POSITION SENSOR OPERATION

Note. For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-5 to ensure system is functioning properly. Ensure no DTCs are present before performing this test.

1. Start engine and allow it to idle. Using scan tool, monitor engine speed (RPM) while wiggling Throttle Position (TP) sensor connector and wiring harness. If RPM changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused RPM to change. If RPM does not change while wiggling connector and wiring harness, turn ignition off and go to next step.
2. Turn ignition on. Using scan tool, monitor TP sensor voltage while slowly opening throttle to Wide Open Throttle (WOT), then close throttle. If voltage change was smooth, go to next step. If voltage change was not smooth, replace TP sensor.
3. Ensure ignition is on. Using scan tool, monitor TP sensor voltage while wiggling TP sensor connector and wiring harness. If voltage changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused voltage to change. If voltage does not change while wiggling connector and wiring harness, go to next step.
4. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. No problem is indicated at this time. Test is complete.
5. Turn ignition on. Using scan tool, read TP sensor voltage. Ensure throttle is closed against throttle stop. If voltage is .92 volt or less, no problem is indicated at this time. Test is complete. If voltage is more than .92 volt, check for binding throttle. Repair throttle linkage as necessary. If throttle is not binding, replace TP sensor.

TEST NTC-16: CHECKING A/C SYSTEM OPERATION

Note. For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2 to ensure system is functioning properly. Ensure no DTCs are present before performing this test.

Note. Ensure A/C system is properly charged before performing procedure.

1. Turn ignition off. Disconnect A/C compressor clutch connector. Measure resistance between ground and Black wire at A/C compressor clutch. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between A/C compressor clutch and ground. Ground is located at right rear of cylinder block.
2. Remove A/C clutch relay from Power Distribution Center (PDC). (Scheme 4) PDC is located on left side of engine compartment. Measure resistance of Dark Blue/Black wire between A/C compressor clutch harness connector and terminal "D" at A/C clutch relay socket in PDC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Black wire.
3. Measure voltage between ground and terminal "B" (Red/Brown wire) at A/C clutch relay socket in PDC. (Scheme 4) If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, check for open in Red/Brown wire between A/C clutch relay and fuse "B" (30-amp) at PDC. Repair wiring as necessary. Also check fuse "B" in PDC. Replace fuse as necessary.
4. Reinstall A/C clutch relay. Turn ignition on. Using scan tool, actuate A/C clutch relay. Measure voltage between ground and Dark Blue/Black wire at A/C compressor clutch harness connector. If voltage changes from zero volts to 11 volts, replace A/C compressor clutch coil. If voltage does not change from zero volts to 11 volts, go to next step.
5. At this time, A/C clutch relay is assumed to be defective. Replace A/C clutch relay.