Powertrain Control Module Diagnosis General Information
The approved procedure for diagnosing all powertrain control system malfunctions is included in the Strategy Based Diagnostic Flow . The preliminary checks and the Powertrain On-Board Diagnostic System Check must be performed to successfully diagnose and repair the powertrain systems.
To read and clear diagnostic trouble codes, use a scan tool.
Important: Use a scan tool to clear diagnostic trouble codes from the PCM memory. Diagnostic trouble codes can also be cleared by turning OFF the ignition and disconnecting the battery power from the PCM for 30 seconds, but this method will also cause all diagnostic information in the PCM memory to be cleared and all the diagnostic tests will have to be re-run.
Since the PCM can have a failure which may affect only one circuit, following the approved diagnostic procedures will determine which circuit has a problem and where it is. If a diagnostic table indicates that the PCM connections or PCM is the cause of a problem and the PCM is replaced, but does not correct the problem, one of the following conditions may exist:
| • | There is a problem with the PCM terminal connections. The diagnostic table will indicate that the PCM connections or PCM is the problem. The terminals may have to be removed from the PCM connector in order to check them properly. |
| • | The EEPROM program is not correct for the application. |
| • | Incorrect components may cause a malfunction and may or may not set a DTC. |
| • | The problem is intermittent. This means that the problem is not present at the time the system is being checked. In this case, refer to the Symptoms portion of the manual and make a careful visual and physical inspection of all suspected components and wiring associated with the affected system. |
| • | Shorted solenoid, relay coil, or harness. Solenoids and relays are turned ON and OFF by the PCM using internal electronic switches called drivers. Each driver is part of a group of seven called output driver modules. A shorted solenoid, relay coil, or harness will not damage the PCM but will cause the solenoid or relay to be inoperative. The J 34636 tester, or equivalent, provides a fast, accurate means of checking for a shorted coil or a short to battery voltage. |
Powertrain Control Module Diagnosis Powertrain DTCs
Important: The PCM Diagnostic Trouble Codes table lists the DTCs supported by this vehicle application. If any DTCs not listed here are displayed by a scan tool, scan tool data may be faulty; notify the scan tool manufacturer of any DTCs displayed that are not included in the following table.
DTC Description | Type | Illuminate MIL |
|---|---|---|
A | Yes | |
A | Yes | |
A | Yes | |
DTC P0106 Manifold Absolute Pressure (MAP) System Performance | B | Yes |
DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage | B | Yes |
DTC P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage | B | Yes |
DTC P0112 Intake Air Temperature (IAT) Sensor Circuit Low Voltage | B | Yes |
DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage | B | Yes |
DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage | B | Yes |
DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage | B | Yes |
A | Yes | |
A | Yes | |
DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage | A | Yes |
DTC P0125 Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control | B | Yes |
B | Yes | |
B | Yes | |
B | Yes | |
DTC P0134 HO2S Circuit Insufficient Activity Bank 1 Sensor 1 | B | Yes |
B | Yes | |
B | Yes | |
B | Yes | |
DTC P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2 | B | Yes |
B | Yes | |
B | Yes | |
B | Yes | |
DTC P0146 HO2S Circuit Insufficient Activity Bank 1 Sensor 3 | B | Yes |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
DTC P0154 HO2S Circuit Insufficient Activity Bank 2 Sensor 1 | B | Yes |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
D | No | |
D | No | |
D | No | |
B | Yes | |
B | Yes | |
A | Yes | |
A | Yes | |
DTC P0441 Evaporative Emission (EVAP) System No Flow During Purge | B | Yes |
A | Yes | |
Vehicle Speed Sensor Circuit - Low Input (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Vehicle Speed Sensor Circuit - Intermittent Input (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
B | Yes | |
B | Yes | |
DTC P0530 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit | D | No |
D | No | |
A | Yes | |
D | No | |
B | Yes | |
Transmission Fluid Temperature (TFT) Sensor Circuit - Low Signal Voltage (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Transmission Fluid Temperature (TFT) Sensor Circuit - High Signal Voltage (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Brake Switch Circuit Low (Refer to 4L60-E Automatic Transmission Diagnosis ) | D | No |
Brake Switch Circuit High (Refer to 4L60-E Automatic Transmission Diagnosis ) | D | No |
Torque Converter Clutch Circuit Stuck On (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Pressure Control Solenoid Electrical (Refer to 4L60-E Automatic Transmission Diagnosis ) | D | No |
Shift Solenoid 1 - Performance/Stuck Off (Refer to 4L60-E Automatic Transmission Diagnosis ) | B | Yes |
Shift Solenoid 1 - Electrical (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Shift Solenoid 2 - Performance/Stuck Off (Refer to 4L60-E Automatic Transmission Diagnosis ) | B | Yes |
Shift Solenoid 2 - Electrical (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
DTC P1106 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage | D | No |
DTC P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage | D | No |
DTC P1111 Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage | D | No |
DTC P1112 Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage | D | No |
DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage | D | No |
DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage | D | No |
DTC P1121 Throttle Position (TP) Sensor Circuit Intermittent High Voltage | D | No |
DTC P1122 Throttle Position (TP) Sensor Circuit Intermittent Low Voltage | D | No |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
B | Yes | |
DTC P1374 Crankshaft Position (CKP) High to Low Resolution Frequency Correlation | B | Yes |
DTC P1381 Misfire Detected - No Communication with Brake Control Module | D | No |
DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance | B | Yes |
DTC P1441 Evaporative Emission (EVAP) System Flow During Non-Purge | B | Yes |
B | Yes | |
D | No | |
D | No | |
D | No | |
B | Yes | |
D | No | |
D | No | |
B | Yes | |
B | Yes | |
DTC P1654 Air Conditioning (A/C) Clutch Relay Control Circuit | D | No |
DTC P1655 Evaporative Emission (EVAP) Purge Solenoid Control Circuit | B | Yes |
D | No | |
Pressure Switch Manifold (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Transmission Over Temperature Condition (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Torque Converter Clutch PWM Solenoid Circuit (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Torque Converter Clutch Enable Solenoid Circuit (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Transmission Component Slipping (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
Shift/Timing Solenoid Range/Performance (Refer to 4L60-E Automatic Transmission Diagnosis ) | A | Yes |
