Engine Controls Self-Diagnostics - Gasoline: Overview Dodge Cab & Chassis R3500

CONNECTOR IDENTIFICATION

CONNECTOR IDENTIFICATION DIRECTORY

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Description

Heater circuit for 1/1 Heated Oxygen Sensor (HO2S) is monitored when battery voltage is more than 10.6 volts and engine coolant temperature is less than a specified temperature, but within a set temperature difference of battery temperature sensor. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses HO2S heater circuit voltage is less than a predetermined value.

Heater circuit for 1/2 Heated Oxygen Sensor (HO2S) is monitored when battery voltage is more than 10.6 volts and engine coolant temperature is less than a specified temperature, but within a set temperature difference of battery temperature sensor. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses HO2S heater circuit voltage is less than a predetermined value.

Heater circuit for 2/1 Heated Oxygen Sensor (HO2S) is monitored when battery voltage is more than 10.6 volts and engine coolant temperature is less than a specified temperature, but within a set temperature difference of battery temperature sensor. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses HO2S heater circuit is less than a predetermined value.

Note. Ambient temperature sensor is also referred to as Battery Temperature Sensor (BTS).

BTS performance is monitored with ignition on, coolant temperature more than 160°F (71°C) and no intake air temperature sensor faults present. DTC will set in Powertrain Control Module (PCM) memory after engine has completed 5 warm-up cycles, odometer mileage has increased 197 miles and inlet air temperature has increased less than 5°F. Two trips are required to set this DTC. Possible causes for DTC to set are: defective BTS, defective PCM, or defective connectors or wiring.

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 is more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses MAP sensor voltage is less than .1 volt for 2 seconds when engine is running. Possible causes are: defective MAP sensor, defective PCM, or defective connectors or wiring.

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 is more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses MAP sensor voltage is more than 4.88 volts when engine starts or with engine running for 2.2 seconds. Possible causes for DTC to set are: defective MAP sensor, defective PCM, or defective connectors or wiring.

Intake air temperature performance is monitored with ignition on, coolant temperature more than 160°F (71°C) and no intake air temperature sensor faults present. DTC will set in Powertrain Control Module (PCM) memory after engine has completed 5 warm-up cycles, odometer mileage has increased 197 miles and inlet air temperature has increased less than 5°F. Possible causes for DTC to set are: defective Intake Air Temperature (IAT) sensor, defective PCM, or defective connectors or wiring.

Intake Air Temperature (IAT) sensor voltage is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory when IAT sensor voltage at PCM is less than .08 volt. Possible causes for DTC to set are: defective IAT sensor, defective PCM, or defective connectors or wiring.

Intake Air Temperature (IAT) sensor voltage is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when IAT sensor voltage at PCM is more than 4.9 volts. Possible causes are: intermittent condition, or defective connectors or wiring.

Engine Coolant Temperature (ECT) sensor voltage is monitored when ignition is on and battery voltage is 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, or defective connectors or wiring.

Engine Coolant Temperature (ECT) sensor voltage is monitored when ignition is on. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses ECT sensor voltage is more than 4.9 volts for more than 3 seconds. Possible causes for DTC to set are: defective ECT sensor, defective PCM, or defective connectors or wiring.

Throttle Position (TP) sensor voltage is monitored when engine is running and no Manifold Absolute Pressure (MAP) sensor or TP sensor DTCs exist. Engine speed must be more than 1600 RPM. When manifold vacuum is low, TP sensor signal should be high. When manifold vacuum is high, TP sensor signal should be low. DTC will be stored in Powertrain Control Module (PCM) memory if PCM senses MAP sensor and TP sensor signals do not respond as specified within 4 seconds. Possible causes for DTC to set are: MAP sensor DTC exists, improper TP sensor voltage, defective TP sensor, or defective connectors or wiring.

Throttle Position (TP) sensor voltage is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses TP sensor signal voltage is .2 volt for 1.3 seconds. Possible causes for DTC to set are: defective TP sensor, defective PCM, or defective connectors or wiring.

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

Closed loop operation is monitored after engine has been running for 10 minutes and battery voltage is more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) if engine temperature does not increase more than 18°F in 10 minutes after engine is started for 2 consecutive trips. Possible causes are: extremely cold outside temperatures, improper coolant level, defective thermostat, defective Engine Coolant Temperature (ECT) sensor, or defective connectors or wiring.

1/1 Heated Oxygen Sensor (HO2S) is monitored at a cold start, engine coolant temperature is less than 98°F (37°C) and battery temperature sensor reading is within 27°F of engine coolant temperature and engine coolant temperature is more than 170°F (77°C) the last time ignition was on. DTC will be stored in Powertrain Control Module (PCM) memory if 1/1 oxygen sensor signal 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, or defective connectors or wiring.

1/1 Heated Oxygen Sensor (HO2S) is monitored when engine is running for more than 4 minutes and engine coolant temperature is more than 180°F (82°C) with battery voltage more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if 1/1 HO2S signal voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 1/1 HO2S, defective PCM, or defective connectors or wiring.

1/1 Heated Oxygen Sensor (HO2S) slow response is monitored with engine temperature more than 147°F (64°C), after reaching vehicle speed of 10 MPH, throttle is off idle for 2 minutes, vehicle is brought to stop and allowed to idle with transmission in Drive (A/T) or Neutral (M/T). DTC will be stored in Powertrain Control Module (PCM) memory if 1/1 oxygen sensor signal voltage is switching from less than .27 volt to more than .62 volt and back fewer times than required. Possible causes for DTC to set are: exhaust leak, defective 1/1 HO2S, or defective connectors or wiring.

1/1 Heated Oxygen Sensor (HO2S) heater is monitored when battery voltage is more than 9 volts, at a cold start, engine coolant temperature is less than 147°F (64°C), battery temperature is within 27°F of engine temperature and engine has been idling for at least 12 seconds. DTC will be stored in Powertrain Control Module (PCM) if 1/1 HO2S voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 1/1 HO2S, defective Auto Shutdown (ASD) relay circuit, defective O2 HTR REAR relay circuit, or defective connectors or wiring.

1/2 oxygen sensor heater circuit is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if PCM relay control circuit between PCM and relay for 1/2 oxygen sensor heater does not match desired stated. Possible causes for DTC to set are: defective fuse "K", defective oxygen sensor downstream relay, defective PCM, or defective connectors or wiring. The oxygen sensor downstream relay may also be referred to as O2 HTR REAR relay.

1/2 Heated Oxygen Sensor (HO2S) is monitored at a cold start, engine coolant temperature is less than 98°F (37°C) and battery temperature sensor reading is within 27°F of engine coolant temperature and engine coolant temperature is more than 170°F (77°C) the last time ignition was on. DTC will be stored in Powertrain Control Module (PCM) memory if 1/2 oxygen sensor signal 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, or defective connectors or wiring.

1/2 Heated Oxygen Sensor (HO2S) is monitored when engine is running for more than 4 minutes and engine coolant temperature is more than 180°F (82°C) with battery voltage more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if 1/2 HO2S signal voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 1/2 HO2S, defective PCM, or defective connectors or wiring.

1/2 Heated Oxygen Sensor (HO2S) slow response is monitored with engine temperature more than 147°F (64°C), after reaching vehicle speed of 10 MPH, throttle is off idle for 2 minutes, vehicle is brought to stop and allowed to idle with transmission in Drive (A/T) or Neutral (M/T). DTC will be stored in Powertrain Control Module (PCM) memory if 1/2 oxygen sensor signal voltage is switching from less than .27 volt to more than .62 volt and back fewer times than required. Possible causes for DTC to set are: exhaust leak, defective 1/2 HO2S, or defective connectors or wiring.

1/2 Heated Oxygen Sensor (HO2S) heater is monitored when battery voltage is more than 9 volts, at a cold start, engine coolant temperature is less than 147°F (64°C), battery temperature is within 27°F of engine temperature and engine has been idling for at least 12 seconds. DTC will be stored in Powertrain Control Module (PCM) if 1/2 HO2S voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 1/2 HO2S, defective Auto Shutdown (ASD) relay circuit, defective O2 HTR REAR relay circuit, or defective connectors or wiring.

1/3 Heated Oxygen Sensor (HO2S) is monitored at a cold start, engine coolant temperature is less than 98°F (37°C) and battery temperature sensor reading is within 27°F of engine coolant temperature and engine coolant temperature is more than 170°F (77°C) the last time ignition was on. DTC will be stored in Powertrain Control Module (PCM) memory if 1/3 oxygen sensor signal voltage is less than .156 volt for 28 seconds after engine is started. Possible causes for DTC to set are: defective 1/3 HO2S, defective PCM, or defective connectors or wiring.

1/3 Heated Oxygen Sensor (HO2S) is monitored when engine is running for more than 4 minutes and engine coolant temperature is more than 180°F (82°C) with battery voltage more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if 1/3 HO2S signal voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 1/3 HO2S, defective PCM, or defective connectors or wiring.

1/3 Heated Oxygen Sensor (HO2S) slow response is monitored with engine temperature more than 147°F (64°C), after reaching vehicle speed of 10 MPH, throttle is off idle for 2 minutes, vehicle is brought to stop and allowed to idle with transmission in Drive (A/T) or Neutral (M/T). DTC will be stored in Powertrain Control Module (PCM) memory if 1/3 oxygen sensor signal voltage is switching from less than .27 volt to more than .62 volt and back fewer times than required. Possible causes for DTC to set are: exhaust leak, defective 1/3 HO2S, or defective connectors or wiring.

1/3 Heated Oxygen Sensor (HO2S) heater is monitored when battery voltage is more than 9 volts, at a cold start, engine coolant temperature is less than 147°F (64°C), battery temperature is within 27°F of engine temperature and engine has been idling for at least 12 seconds. DTC will be stored in Powertrain Control Module (PCM) if 1/3 HO2S voltage is more than 3 volts for 30-90 seconds. Possible causes for DTC to set are: defective 1/3 HO2S, defective Auto Shutdown (ASD) relay circuit, defective O2 HTR REAR relay circuit, or defective connectors or wiring.

2/1 Heated Oxygen Sensor (HO2S) is monitored at a cold start, engine coolant temperature is less than 98°F (37°C) and battery temperature sensor reading is within 27°F of engine coolant temperature and engine coolant temperature is more than 170°F (77°C) the last time ignition was on. DTC will be stored in Powertrain Control Module (PCM) memory if 2/1 oxygen sensor signal 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, or defective connectors or wiring.

2/1 Heated Oxygen Sensor (HO2S) is monitored when engine is running for more than 4 minutes and engine coolant temperature is more than 180°F (82°C) with battery voltage more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if 2/1 HO2S signal voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 2/1 HO2S, defective PCM, or defective connectors or wiring.

2/1 Heated Oxygen Sensor (HO2S) slow response is monitored with engine temperature more than 147°F (64°C), after reaching vehicle speed of 10 MPH, throttle is off idle for 2 minutes, vehicle is brought to stop and allowed to idle with transmission in Drive (A/T) or Neutral (M/T). DTC will be stored in Powertrain Control Module (PCM) memory if 2/1 oxygen sensor signal voltage is switching from less than .27 volt to more than .62 volt and back fewer times than required. Possible causes for DTC to set are: exhaust leak, defective 2/1 HO2S, or defective connectors or wiring.

2/1 Heated Oxygen Sensor (HO2S) heater is monitored when battery voltage is more than 9 volts, at a cold start, engine coolant temperature is less than 147°F (64°C), battery temperature is within 27°F of engine temperature and engine has been idling for at least 12 seconds. DTC will be stored in Powertrain Control Module (PCM) if 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 Auto Shutdown (ASD) relay circuit, defective O2 HTR REAR relay circuit, or defective connectors or wiring.

2/2 Heated Oxygen Sensor (HO2S) is monitored at a cold start, engine coolant temperature is less than 98°F (37°C) and battery temperature sensor reading is within 27°F of engine coolant temperature and engine coolant temperature is more than 170°F (77°C) the last time ignition was on. DTC will be stored in Powertrain Control Module (PCM) memory if 2/2 oxygen sensor signal 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, or defective connectors or wiring.

2/2 Heated Oxygen Sensor (HO2S) is monitored when engine is running for more than 4 minutes and engine coolant temperature is more than 180°F (82°C) with battery voltage more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if 2/2 HO2S signal voltage is more than 1.5 volts. Possible causes for DTC to set are: defective 2/2 HO2S, defective PCM, or defective connectors or wiring.

2/2 Heated Oxygen Sensor (HO2S) slow response is monitored with engine temperature more than 147°F (64°C), after reaching vehicle speed of 10 MPH, throttle is off idle for 2 minutes, vehicle is brought to stop and allowed to idle with transmission in Drive (A/T) or Neutral (M/T). DTC will be stored in Powertrain Control Module (PCM) memory if 2/2 oxygen sensor signal voltage is switching from less than .27 volt to more than .62 volt and back fewer times than required. Possible causes for DTC to set are: exhaust leak, defective 2/2 HO2S, or defective connectors or wiring.

2/2 Heated Oxygen Sensor (HO2S) heater is monitored when battery voltage is more than 9 volts, at a cold start, engine coolant temperature is less than 147°F (64°C), battery temperature is within 27°F of engine temperature and engine has been idling for at least 12 seconds. DTC will be stored in Powertrain Control Module (PCM) if 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 Auto Shutdown (ASD) relay circuit, defective O2 HTR REAR relay circuit, or defective connectors or wiring.

Fuel system lean condition is monitored when engine is running in closed loop, ambient temperature is more than 20°F (-7°C), battery temperature is more than 20°F (-7°C) and altitude is less than 8000 feet. DTC will be stored in Powertrain Control Module (PCM) memory if PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for 2 trips. Possible causes for DTC to set are: defective fuel pump module, defective Throttle Position (TP) sensor, restricted fuel inlet strainer on fuel pump, defective Engine Coolant Temperature (ECT) sensor, defective Manifold Absolute Pressure (MAP) sensor, engine mechanical problem, defective Heated Oxygen Sensor (HO2S), defective fuel filter or defective fuel pressure regulator.

Fuel system lean condition is monitored when engine is running in closed loop, ambient temperature is more than 20°F (-7°C), battery temperature is more than 20°F (-7°C) and altitude is less than 8000 feet. DTC will be stored in Powertrain Control Module (PCM) memory if PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for 2 trips. Possible causes for DTC to set are: defective fuel pump module, defective Throttle Position (TP) sensor, restricted fuel inlet strainer on fuel pump, defective Engine Coolant Temperature (ECT) sensor, defective Manifold Absolute Pressure (MAP) sensor, defective EVAP system, engine mechanical problem, defective Heated Oxygen Sensor (HO2S), defective fuel filter or defective fuel pressure regulator.

Fuel system lean condition is monitored when engine is running in closed loop, ambient temperature is more than 20°F (-7°C), battery temperature is more than 20°F (-7°C) and altitude is less than 8000 feet. DTC will be stored in Powertrain Control Module (PCM) memory if PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for 2 trips. Possible causes for DTC to set are: defective fuel pump module, defective Throttle Position (TP) sensor, restricted fuel inlet strainer on fuel pump, defective Engine Coolant Temperature (ECT) sensor, defective Manifold Absolute Pressure (MAP) sensor, engine mechanical problem, defective Heated Oxygen Sensor (HO2S), defective fuel filter or defective fuel pressure regulator.

Fuel system lean condition is monitored when engine is running in closed loop, ambient temperature is more than 20°F (-7°C), battery temperature is more than 20°F (-7°C) and altitude is less than 8000 feet. DTC will be stored in Powertrain Control Module (PCM) memory if PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for 2 trips. Possible causes for DTC to set are: defective fuel pump module, defective Throttle Position (TP) sensor, restricted fuel inlet strainer on fuel pump, defective Engine Coolant Temperature (ECT) sensor, defective Manifold Absolute Pressure (MAP) sensor, defective EVAP system, engine mechanical problem, defective Heated Oxygen Sensor (HO2S), defective fuel filter or defective fuel pressure regulator.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes for DTC to set are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.

Cylinder misfire is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC will be stored 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 be stored in Powertrain Control Module (PCM) memory when more than a 2 percent misfire rate is measured during 2 trips (one trip on Calif. models) or with a 10-30 percent misfire rate during one trip. For misfire DTC identification, see CYLINDER MISFIRE 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 when ignition is on. DTC will be stored in Powertrain Control Module (PCM) memory when no signal is received from Crankshaft Position (CKP) sensor during engine cranking and at least 3 Camshaft Position (CMP) sensor signals have occurred. Possible causes for DTC to set are: defective CKP sensor, defective CMP sensor, defective PCM, or defective connectors or wiring.

Cam signal is monitored with engine cranking or running and battery voltage more than 10 volts. DTC will set in Powertrain Control Module (PCM) memory after 5 seconds and PCM senses Crankshaft Position (CKP) sensor signals but no signal from Camshaft Position (CMP) sensor. Possible causes for DTC to set are: defective CMP sensor, defective PCM, or defective connectors or wiring.

Ignition coil No. 1 primary circuit is monitored when battery voltage is more than 8 volts during engine cranking or 12 volts with engine running and engine speed less than 2016 RPM with none of ignition coils in dwell when they are checked. DTC will be stored in Powertrain Control Module (PCM) memory when peak current is not achieved within 1.5 milliseconds of the dwell. It may take 3 seconds during cranking or up to 6 seconds while engine is running for DTC to be stored. Possible causes for DTC to set are: defective Auto Shutdown (ASD) relay circuit, defective ignition coil, defective PCM, or defective connectors or wiring.

Ignition coil No. 1 primary circuit is monitored when battery voltage is more than 8 volts during engine cranking or 12 volts with engine running and engine speed less than 2016 RPM with none of ignition coils in dwell when they are checked. DTC will be stored in Powertrain Control Module (PCM) memory when peak current is not achieved within 1.5 milliseconds of the dwell. It may take 3 seconds during cranking or up to 6 seconds while engine is running for DTC to be stored. Possible causes for DTC to set are: defective Auto Shutdown (ASD) relay circuit, defective ignition coil, defective PCM, or defective connectors or wiring.

Ignition coil No. 2 primary circuit is monitored when battery voltage is more than 8 volts during engine cranking or 12 volts with engine running and engine speed less than 2016 RPM with none of ignition coils in dwell when they are checked. DTC may be stored in Powertrain Control Module (PCM) when peak current is not achieved within 1.5 milliseconds of the dwell. It may take 3 seconds during cranking or up to 6 seconds while engine is running for DTC to be stored. Possible causes are: defective Auto Shutdown (ASD) relay circuit, defective ignition coil, defective PCM, or defective connectors or wiring.

Ignition coil No. 3 primary circuit is monitored when battery voltage is more than 8 volts during engine cranking or 12 volts with engine running and engine speed less than 2016 RPM with none of ignition coils in dwell when they are checked. DTC will be stored in Powertrain Control Module (PCM) memory when peak current is not achieved within 1.5 milliseconds of the dwell. It may take 3 seconds during cranking or up to 6 seconds while engine is running for DTC to be stored. Possible causes for DTC to set are: defective Auto Shutdown (ASD) relay circuit, defective ignition coil, defective PCM, or defective connectors or wiring.

Ignition coil No. 4 primary circuit is monitored when battery voltage is more than 8 volts during engine cranking or 12 volts with engine running and engine speed less than 2016 RPM with none of ignition coils in dwell when they are checked. DTC will be stored in Powertrain Control Module (PCM) memory when peak current is not achieved within 1.5 milliseconds of the dwell. It may take 3 seconds during cranking or up to 6 seconds while engine is running for DTC to be stored. Possible causes for DTC to set are: defective Auto Shutdown (ASD) relay circuit, defective ignition coil, defective PCM, or defective connectors or wiring.

Ignition coil No. 5 primary circuit is monitored when battery voltage is more than 8 volts during engine cranking or 12 volts with engine running and engine speed less than 2016 RPM with none of ignition coils in dwell when they are checked. DTC will be stored in Powertrain Control Module (PCM) memory when peak current is not achieved within 1.5 milliseconds of the dwell. It may take 3 seconds during cranking or up to 6 seconds while engine is running for DTC to be stored. Possible causes for DTC to set are: defective Auto Shutdown (ASD) relay circuit, defective ignition coil, defective PCM, or defective connectors or wiring.

Catalytic converter efficiency is monitored after engine is at 147°F (64°C), throttle has been open for 180 seconds, vehicle speed is more 20 MPH with engine at 1200-1700 RPM and Manifold Absolute Pressure (MAP) sensor vacuum is 15-20 in. Hg. DTC will be stored in Powertrain Control Module (PCM) memory if catalytic converter efficiency deteriorates and switching rate of downstream oxygen sensor becomes nearly the same as upstream oxygen sensor. If at any point during the test, if the switch rate reaches a predetermined value, a counter is incremented by one. Possible causes for DTC to set are: engine mechanical problem, exhaust leak, defective 1/1 catalytic converter or upstream Heated Oxygen Sensor (HO2S) is older than downstream HO2S.

Catalytic converter efficiency is monitored when engine is idling and at normal operating temperature. DTC will be stored in Powertrain Control Module (PCM) memory if catalytic converter efficiency deteriorates and switching rate of downstream oxygen sensor becomes nearly the same as upstream oxygen sensor. If at any point during the test, if the switch rate reaches a predetermined value, a counter is incremented by one. Possible causes are: engine mechanical problem, exhaust leak, defective 2/1 catalytic converter or upstream HO2S is older than downstream HO2S.

EVAP purge flow is monitored after engine warms up to more than 170°F (77°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 (4-32°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. DTC P0456 will set when PCM senses a leak of .020-.040" (.005-.010 mm) in EVAP system. Possible causes for DTC to set are: damaged EVAP hose, leaking EVAP system component, leaking Leak Detection Pump (LDP), loose fuel tank cap, defective secondary seal in fuel filler neck, or defective connectors or wiring.

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, or defective connectors or wiring.

Fuel level sending unit may also be referred to as fuel level sensor. Fuel tank module may also be referred to as fuel pump module. Fuel level unit change over miles is monitored when engine is running and fuel level is either less than 15 percent of fuel tank capacity or more than 85 percent of fuel tank capacity. Possible causes for DTC to set are: fuel tank obstructed, defective fuel level sensor, or defective connectors or wiring.

Fuel level sending unit voltage is monitored when ignition is on and battery voltage is more than 10.4 volts. Fuel level sending unit may also be referred to as fuel level sensor. DTC will be stored in Powertrain Control Module (PCM) memory when fuel level sensor voltage at PCM is less than .2 volt for 5 seconds. Possible causes for DTC to set are: defective fuel level sensor, defective PCM, or defective connectors or wiring.

Fuel level sending unit voltage is monitored when ignition is on and battery voltage is more than 10.4 volts. Fuel level sending unit may also be referred to as fuel level sensor. DTC will be stored in Powertrain Control Module (PCM) memory when fuel level sensor voltage at PCM is more than 9.4 volts for 2 seconds. Possible causes for DTC to set are: defective fuel level sensor, defective PCM, or defective connectors or wiring.

Vehicle Speed Sensor (VSS) signal is monitored when engine is running, transmission is in gear and output shaft speed is more than 64 RPM, engine coolant temperature is more than 104°F (40°C), MAP sensor vacuum is 15-16 in. Hg. and engine speed is more than 1500 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses no vehicle speed signal from Controller Anti-Lock Brake (CAB) module for more than 15 seconds for 2 consecutive trips. Possible causes for DTC to set are: CAB module DTCs exist, defective CAB module, defective PCM, or defective connectors or wiring.

Scheme 99

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed for DTC P0500 and displayed count is "0", go to next step. If GOOD TRIP counter is not displayed for DTC P0500 or displayed count is not "0", go to step 7.
2. Using scan tool, check CAB module for DTCs. See appropriate ANTI-LOCK article in BRAKES. If no CAB module DTCs exist, go to next step. If any CAB module DTCs exist, perform test procedures for CAB module DTCs.
3. Ensure ignition is off. Disconnect 14-pin CAB module connector. CAB module is located near power distribution center on left side of engine compartment. (Scheme 99) On models with 4-wheel anti-lock brakes which may be referred to as Electronic Brake Control (EBC) 325, there are 2 connectors at CAB module. Connector C1 is a 14-pin connector and connector C2 is a 4-pin connector. On models with rear wheel anti-lock brakes which may be referred to as EBC 2, there is only one 14-pin connector at CAB module. On all models, turn ignition. Measure voltage between ground and terminal No. 12 (White/Orange wire) at 14-pin CAB module harness connector. (Scheme 83) If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair short to voltage in White/Orange wire between CAB module and PCM. PCM is located in right rear corner of engine compartment.
4. Turn ignition off. Ensure 14-pin CAB module connector is still disconnected. Disconnect PCM connectors. PCM is located in right rear corner of engine compartment. see scheme 2 Measure resistance of White/Orange wire between terminal No. 12 at 14-pin CAB module harness connector and terminal No. 27 at PCM C2 harness connector. (Scheme 83)and (Scheme 96). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Orange wire.
5. Ensure 14-pin CAB module connector is still disconnected and PCM connectors are still disconnected. Measure resistance between ground and terminal No. 27 (White/Orange 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 White/Orange wire between CAB module and PCM.
6. Ensure ignition is off. Reconnect PCM connectors. Ensure 14-pin CAB module connector is still disconnected. Turn ignition on. Connect one end of jumper wire to terminal No. 12 (White/Orange wire) at 14-pin CAB module harness connector. Using scan tool, monitor vehicle speed sensor signal while momentarily touching other end of jumper wire to ground. If scan tool displays zero MPH, go to next step. If scan tool displays more than zero MPH, replace CAB module.
7. DTC is being caused by an intermittent problem. Raise and support vehicle so rear wheels are free to rotate. Start engine and allow engine to idle. Using scan tool, monitor vehicle speed sensor signal. Place transmission in any forward gear and allow wheels to rotate. If scan tool displays more than zero MPH, go to next step. If scan tool displays zero MPH, turn ignition off and go to step 9.
8. Turn ignition off. At this time, conditions required to set DTC are not present. Using scan tool, read FREEZE FRAME data to determine when DTC was stored. Attempt to duplicate conditions recorded in FREEZE FRAME data to see if DTC reoccurs. Vehicle must be road tested, as this DTC cannot be stored by operating vehicle on a hoist. Inspect wiring harness and connectors between PCM and CAB module. PCM is located in right rear corner of engine compartment. CAB module is located on top of Hydraulic Control Unit (HCU) at driver's side of engine compartment, near power distribution center. (Scheme 99) If no problems exist, test is complete. If any problems exist, repair wiring or connectors as necessary.
9. Turn ignition on. Using scan tool, check CAB module for DTCs. See appropriate ANTI-LOCK article in BRAKES. If no CAB module DTCs exist, go to next step. If any CAB module DTCs exist, perform test procedures for CAB module DTCs.
10. Turn ignition off. Disconnect 14-pin CAB module harness connector. CAB module is located near power distribution center on left side of engine compartment. (Scheme 99) On models with 4-wheel anti-lock brakes which may be referred to as Electronic Brake Control (EBC) 325, there are 2 connectors at CAB module. Connector C1 is a 14-pin connector and connector C2 is a 4-pin connector. On models with rear wheel anti-lock brakes which may be referred to as EBC 2, there is only one 14-pin connector at CAB module. On all models, turn ignition on. Measure voltage between ground and terminal No. 12 (White/Orange wire) at 14-pin CAB module harness connector. (Scheme 83) If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair short to voltage in White/Orange wire between CAB module and PCM. PCM is located in right rear corner of engine compartment.
11. Turn ignition off. Ensure 14-pin CAB module connector is still disconnected. Disconnect PCM connectors. PCM is located in right rear corner of engine compartment. see scheme 2 Measure resistance of White/Orange wire between terminal No. 12 at 14-pin CAB module harness connector and terminal No. 27 (White/Orange wire) at PCM harness connector. (Scheme 83)and (Scheme 96). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Orange wire.
12. Ensure 14-pin CAB module connector is still disconnected and PCM connectors are still disconnected. Measure resistance between ground and terminal No. 27 (White/Orange wire) at PCM C2 harness connector. If resistance is 5 ohms or more, replace PCM. If resistance is less than 5 ohms, repair short to ground on White/Orange wire between CAB module and PCM.

Idle Air Control (IAC) motor circuits are monitored when ignition is on and battery voltage is more than 11.5 volts. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses a short to ground or battery voltage for 100 milliseconds on any of IAC motor driver circuits while IAC motor is operating. Possible causes for DTC to set are: defective IAC motor, or defective connectors or wiring.

Generator field switching is monitored when ignition is on and engine is running. DTC will be stored in Powertrain Control Module (PCM) memory when PCM tries to regulate generator field with no result during monitoring. Possible causes for DTC to set are: defective generator, defective PCM, or defective connectors or wiring.

A/C clutch relay may also be referred to as A/C compressor clutch relay. A/C clutch relay circuit is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if an open or short exists in A/C clutch relay control circuit. Possible causes for DTC to set are: defective A/C clutch relay, 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 (77°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: excessive oil or coolant consumption, defective 1/1 HO2S, defective connector or wiring.

2/1 Heated Oxygen Sensor (HO2S) catalyst monitor is monitored with engine running, coolant temperature more than 170°F (77°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: excessive oil or coolant consumption, defective 2/1 HO2S, defective connector or wiring.

1/2 Heated Oxygen Sensor (HO2S) catalyst monitor is monitored with engine running, coolant temperature more than 170°F (77°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 1/2 HO2S is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes for DTC to set are: excessive oil or coolant consumption, defective 1/2 HO2S, defective connector or wiring.

Engine coolant temperature is monitored with engine running. DTC will set in Powertrain Control Module (PCM) memory when PCM senses engine coolant temperature does not reach 176°F (80°C) while driving for 20 minutes after start. Possible causes for DTC to set are: defective thermostat or cooling system problem.

Fuel pump/system relay control circuit is monitored when ignition is on and battery voltage is more than 10 volts. DTC will be stored in Powertrain Control Module (PCM) memory when PCM detects an open or shorted condition in the fuel pump relay control circuit. Possible causes for DTC to set are: defective fuel pump relay, fused ignition switch output circuit open, fuel pump relay control circuit open or shorted, defective PCM, or defective connectors or wiring.

Engine speed is monitored with engine idling, transaxle 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. Possible causes for DTC to set are: vacuum leak, defective throttle body, throttle plate or linkage improperly positioned, or defective connectors or wiring.

Manifold Absolute Pressure (MAP) sensor voltage is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC will set in PCM memory when PCM senses MAP sensor voltage is less than 2.35 volts for 5 seconds with ignition on. Possible causes for either DTC to set are: defective MAP sensor, defective PCM, or defective connectors or wiring.

Manifold Absolute Pressure (MAP) sensor operation is monitored when engine speed is within 64 RPM of target idle with throttle closed. DTC will be stored in Powertrain Control Module (PCM) memory if too small a difference is seen between barometric pressure and manifold vacuum with ignition on for 8.80 seconds. Possible causes for DTC to set are: restricted or leaking vacuum supply to MAP sensor, restricted or defective MAP sensor, or defective connectors or wiring.

DTC will set in Powertrain Control Module (PCM) memory if Manifold Absolute Pressure (MAP) sensor does not correlate with Throttle Position (TP) sensor. Possible causes for DTC to set are: vacuum leak, defective MAP sensor or defective TP sensor.

Auto Shutdown (ASD) relay operation is monitored when ignition is on and battery voltage is more than 10 volts. DTC will be stored in Powertrain Control Module (PCM) memory if PCM detects an open or shorted condition in ASD relay control circuit. Possible causes for DTC to set are: defective ASD relay circuit, defective ASD relay, defective PCM, or defective connectors or wiring.

Auto Shutdown (ASD) relay output voltage is monitored when ignition is on, battery voltage is more than 10.4 volts and engine speed is more than 400 RPM. DTC will be stored in Powertrain Control Module (PCM) if PCM senses no voltage when ASD relay is energized. Possible causes for DTC to set are: defective ASD relay, defective PCM, or defective connectors or wiring.

Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor signals are monitored with engine cranking or running. DTC will be stored in Powertrain Control Module (PCM) memory when failure counter reaches 20 for 2 consecutive trips. Possible causes for DTC to set are: defective CMP sensor, defective CKP sensor, defective crankshaft notches, defective target magnet, or defective connectors or wiring.

Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor signals are monitored with engine cranking or running. DTC will be stored in Powertrain Control Module (PCM) memory when failure counter reaches 20 for 2 consecutive trips. Possible causes for DTC to set are: defective CMP sensor, defective CKP sensor, defective crankshaft notches, defective target magnet, or defective connectors or wiring.

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

EVAP leak monitor is monitored after cold start with ambient temperature of 40-90°F (4-32°C) and coolant temperature within 10°F 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.

Ambient/battery temperature sensor is referred to as Battery Temperature Sensor (BTS). BTS voltage is monitored when ignition is on. DTC will be stored in Powertrain Control Module (PCM) memory if PCM senses voltage from BTS is more than 4.9 volts for 3 seconds. Possible causes for DTC to set are: defective BTS, defective PCM, or defective connectors or wiring.

Ambient/battery temperature sensor is referred to as Battery Temperature Sensor (BTS). BTS voltage is monitored when ignition is on. DTC will be stored in Powertrain Control Module (PCM) memory if PCM senses voltage from BTS is less than .5 volt for 3 seconds. Possible causes for DTC to set are: defective BTS, defective PCM, or defective connectors or wiring.

Leak Detection Pump (LDP) switch operation is monitored immediately after a cold start, with ambient temperature 40-90°F (4-32°C) and engine coolant temperature within 10°F 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, or defective connectors or wiring.

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

Charging system voltage is monitored when ignition is on and engine is running. DTC will be stored in Powertrain Control Module (PCM) memory when PCM attempts to regulate generator field with no detected field problems but voltage output does not decrease. Possible causes for DTC to set are: defective Battery Temperature Sensor (BTS), defective generator, defective PCM, or defective connectors or wiring.

Speed control solenoids circuits are monitored when ignition is on, speed control is on and vehicle speed is more than 35 MPH. DTC will be stored in Powertrain Control Module (PCM) memory if PCM actuates speed control vacuum and vent solenoids and solenoids do not operate. Possible causes for DTC to set are: improperly adjusted brake switch, defective brake switch, defective speed control servo, defective PCM, or defective connectors or wiring.

Scheme 100

1. Turn ignition on. Using scan tool, actuate speed control vent solenoid and listen for operating sound (click) at speed control servo. Speed control servo is located near battery tray. (Scheme 100) Using scan tool, actuate speed control vacuum solenoid and listen for operating sound (click) at speed control servo. If both solenoids operate, go to step 15. If both solenoids are inoperative, go to step 10. If speed control vent solenoid is inoperative, go to step 6. If speed control vacuum solenoid is inoperative, go to next step.
2. Turn ignition off. Disconnect speed control servo connector. Turn ignition on. Using scan tool, actuate speed control vacuum solenoid. Using a test light connected to positive battery voltage, probe terminal No. 1 (Tan/Red wire) at speed servo harness connector. (Scheme 97) If test light does not flash on and off, go to next step. If test light flashes on and off, replace speed control servo.
3. Turn ignition off. Disconnect PCM connectors. PCM is located in right rear corner of engine compartment. see scheme 2 Measure resistance of Tan/Red wire between terminal No. 1 at speed control servo harness connector and terminal No. 4 at PCM C3 harness connectors. (Scheme 96)and (Scheme 97). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Red wire.
4. Measure resistance between ground and terminal No. 1 (Tan/Red wire) at speed control servo 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 Tan/Red wire between PCM and speed control servo.
5. At this time, PCM is assumed to be defective. Replace PCM.
6. Turn ignition off. Disconnect speed control servo connector. Turn ignition on. Using scan tool, actuate speed control vent solenoid. Using a test light connected to positive battery voltage, probe terminal No. 2 (Light Green/Red wire) at speed servo harness connector. (Scheme 97) If test light does not flash on and off, go to next step. If test light flashes on and off, replace speed control servo.
7. Turn ignition off. Disconnect PCM connectors. PCM is located in right rear corner of engine compartment. see scheme 2 Measure resistance of Light Green/Red wire between terminal No. 2 at speed control servo harness connector and terminal No. 5 at PCM C3 harness connectors. (Scheme 96)and (Scheme 97). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire.
8. Measure resistance between ground and terminal No. 2 (Light Green/Red wire) at speed control servo 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 Light Green/Red wire between PCM and speed control servo.
9. At this time, PCM is assumed to be defective. Replace PCM.
10. Turn ignition off. Disconnect speed control servo connector. Turn ignition on. Turn speed control on/off switch to ON position. Using a test light connected to ground, probe terminal No. 3 (Dark Blue/Red wire) at speed control servo harness connector. DO NOT depress brake pedal when checking voltage. If test light illuminates brightly, replace speed control servo. If test light does not illuminate brightly, go to next step.
11. Turn ignition off. Disconnect brakelight switch connector. Measure resistance of Dark Blue/Red wire between brakelight switch harness connector and terminal No. 3 at speed control servo harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Red wire.
12. Turn ignition on. Turn speed control on/off switch to ON position. Using a test light connected to ground, probe Yellow/Red wire at brakelight switch harness connector. If test light illuminates brightly, replace brakelight switch. If test light does not illuminate brightly, go to next step.
13. Turn ignition off. Disconnect PCM connectors. PCM is located in right rear corner of engine compartment. see scheme 2 Measure resistance of Yellow/Red wire between brakelight switch harness connector and terminal No. 11 at PCM C3 harness connector. (Scheme 96) If resistance is 5 ohms or more, repair open in Yellow/Red wire. If resistance is less than 5 ohms, go to next step.
14. At this time, PCM is assumed to be defective. Replace PCM.
15. Turn ignition off. Disconnect speed control servo connector. Measure resistance between ground and terminal No. 4 (Black wire) at speed control servo harness connector. (Scheme 97) If resistance less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between speed control servo and ground connection. Ground connection is located on battery tray
16. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review FREEZE FRAME data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If no problems are indicated, test is complete.

Speed control switch is monitored when ignition is on. DTC will be stored in Powertrain Control Module (PCM) memory if open is detected in speed control on/off switch circuit and voltage is more than 4.8 volts for more than 2 minutes. Possible causes for DTC to set are: defective clockspring, defective speed control on/off switch on steering wheel, defective PCM, or defective connectors or wiring.

Scheme 101

1. Start engine and allow engine to idle. Using scan tool in INPUTS/OUTPUTS mode, read speed control inputs. Monitor display on scan tool while turning speed control on/off switch on the steering wheel to ON and OFF positions several times with the switch returned to the ON position. If scan tool displays speed control on/off switch turns OFF and ON, go to next step. If scan tool does not display speed control on/off switch turns OFF and ON, go to step 3.
2. At this time, conditions required for DTC to be stored are not present. Ensure engine is idling. Using scan tool, monitor speed control on/off switch voltage while wiggling wiring harness and connectors between speed control on/off switch and PCM. PCM is located in right rear corner of engine compartment. see scheme 2 If voltage is not more than 4.9 volts at any time while wiggling wiring harness and connectors, test is complete. If voltage is more than 4.9 volts at any time while wiggling wiring harness and connectors, repair wiring or connector as necessary that caused the voltage to fluctuate.
3. Turn ignition off. Disconnect speed control on/off switch 2-pin connector at rear of speed control on/off switch assembly on steering wheel. DO NOT disconnect any other connectors except the 2-pin connector. Measure resistance between ground and terminal No. 1 (White wire) at speed control on/off switch 2-pin harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit (White wire). The White wire goes from speed control on/off switch, through clockspring and then changes to Black/Light Blue wire at clockspring and goes to terminal No. 4 on PCM C1 connector. Clockspring is located on steering column, just below steering wheel. (Scheme 101) PCM is located in right rear corner of engine compartment. see scheme 2
4. Ensure speed control on/off switch 2-pin connector at rear of speed control on/off switch assembly is still disconnected. Start engine and allow engine to idle. Measure voltage between ground and terminal No. 2 (Dark Green/Red wire) on speed control on/off switch 2-pin connector. If voltage is less than 6 volts, go to next step. If voltage is more than 6 volts, repair short to voltage in Dark Green/Red wire. The Dark Green/Red wire goes from speed control on/off switch, through clockspring and then changes to Red/Light Green wire at clockspring and goes to terminal No. 32 on PCM C3 connector. Clockspring is located on steering column, just below steering wheel. (Scheme 101)
5. Turn ignition off. Ensure speed control on/off switch 2-pin connector at rear of speed control on/off switch assembly is still disconnected. Disconnect PCM connectors. Measure resistance between terminal No. 32 (Red/Light Green wire) on PCM C3 harness connector and terminal No. 2 (Dark Green/Red wire) at speed control on/off switch 2-pin harness connector. The Dark Green/Red wire goes from speed control on/off switch, through clockspring and then changes to Red/Light Green wire at clockspring and goes to terminal No. 32 on PCM C3 connector C3. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 7.
6. Measure resistance between electrical terminals on speed control on/off switch. If resistance is 20,300-20,700 ohms, replace PCM. If resistance is not 20,300-20,700 ohms, replace speed control on/off switch.
7. Ensure ignition is off and PCM connectors are still disconnected. Disconnect clockspring C1 connector. (Scheme 101) Measure resistance of Red/Light Green wire between terminal No. 1 at clockspring C1 harness connector and terminal No. 32 at PCM C3 harness connector. (Scheme 81)and (Scheme 96). If resistance is less than 5 ohms, replace clockspring. If resistance is 5 ohms or more, repair open in Red/Light Green wire between clockspring and PCM.

Speed control switch is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC will be stored in Powertrain Control Module (PCM) memory if speed control on/off switch circuit voltage is less than .39 volt for 2 minutes. Possible causes for DTC to set are: defective clockspring, defective speed control on/off or resume/accel switch, defective PCM, or defective connectors or wiring.

Charging system voltage is monitored when ignition is on and engine is more than 1500 RPM for 25 seconds. DTC will be stored in Powertrain Control Module (PCM) memory if PCM regulates generator field with no detected field problems but voltage output does not increase. Possible causes for DTC to set are: defective Battery Temperature Sensor (BTS), defective PCM, or defective connectors or wiring.

DTC P1696 indicates PCM failure EEPROM write denied. Possible cause for DTC to set is: defective PCM.