For 1990-2009 cars

## DTC P0601-P0604, P0606, P0607, P062B, P0167D, P2107, or P2610 ECM DTC

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P0601: Control Module Read Only Memory (ROM)
DTC P0602: Control Module Not Programmed
DTC P0603: Control Module Long Term Memory Reset
DTC P0604: Control Module Random Access Memory (RAM)
DTC P0606: Control Module Internal Performance
DTC P062B: Control Module Fuel Injector Control Performance
DTC P167D: Control Module Ignition Coil Internal Circuit
DTC P2107: Throttle Actuator Control (TAC) Module Internal Circuit
DTC P2610: Control Module Ignition Off Timer Performance

### Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed.

### Conditions for Running the DTC

#### P0601

• | The checksum calculation at power down in the last drive cycle was completely finished.

• | DTC P0601 runs once an ignition cycle when the condition is met for 30 seconds at ignition OFF.

#### P0602

The ignition is ON, with the engine OFF. DTC P0602 runs continuously when the ignition is ON for greater than 1 second.

#### P0603

• | The ignition is ON.

• | The power down calculation in the last drive cycle was completely finished.

• | DTC P0603 runs continuously once the conditions above have been met for greater than 5 seconds.

#### P0604

The read/write test at power down in the last drive cycle completely finished. DTC P0604 runs once an ignition cycle when the condition is met for 5 seconds at ignition OFF.

#### P0606

The power down calculation in the last drive cycle was completely finished. DTC P0606 runs continuously with ignition ON or engine operating for greater than 5 seconds.

#### P062B

• | The engine is operating.

• | The ignition voltage is between 8-18 volts.

• | The engine speed is greater than 80 RPM.

• | DTC P062B runs continuously once the conditions above are met.

#### P167D

• | The engine is operating.

• | The engine speed is less than 6,000 RPM.

• | The ignition voltage is between 10-18 volts.

• | DTC P167D runs continuously once the conditions above are met.

#### P2107

• | The vehicle speed is 0 km/h (0 mph).

• | The engine speed is less than 40 RPM.

• | The accelerator pedal position (APP) is less than 15 percent.

• | The ECM is performing the closed throttle test with the ignition ON and the engine OFF.

• | DTC P2107 runs once the above conditions are met during the throttle actuator control system initialization.

#### P2610

• | The engine speed is greater than 240 RPM.

• | DTC P2610 runs continuously once the engine is operating and the real time clock is active.

### Conditions for Setting the DTC

#### P0601

The ECM detects a read only memory (ROM) checksum error at ECM power up. The error is detected 5 times, then a 5 second delay for MIL ON after the fifth detection.

#### P0602

The ECM detects that programming is incomplete. The condition exists, then a 5 second delay for MIL ON.

#### P0603

The ECM detects a reset error of the internal software that operates the throttle actuator control (TAC) system, during the shut down path test. The condition exists, then a 5 second delay for MIL ON.

#### P0604

The ECM detects random access memory (RAM) errors. The condition exists, then a 5 second delay for MIL ON.

#### P0606

The ECM detects an internal error of monitoring software for the throttle actuated control (TAC) system. The condition exists, then a 5 second delay for MIL ON.

#### P062B

The ECM detects a condition with the integrated circuits of the fuel injector driver module for greater than 4 seconds, or a cumulative of 30 seconds.

#### P167D

The ECM detects a condition with the integrated circuits of the ignition coil driver module for greater than 4 seconds, or a cumulative of 30 seconds.

#### P2107

The ECM detects the internal TP sensor 1 amplification output does not correlate with the TP sensor 1 signal voltage for more than 4 seconds.

#### P2610

The ECM detects the engine off timer signal is missing or not valid for greater than 1 second, or a cumulative of 10 seconds.

### Action Taken When the DTC Sets

• | DTCs P0601, P0602, P0603, P0604, and P0606 are Type A DTCs.

• | DTC P167D, and P2610 are Type B DTCs.

### Conditions for Clearing the DTC

• | DTCs P0601, P0602, P0603, P0604, and P0606 are Type A DTCs.

• | DTC P167D, and P2610 are Type B DTCs.

### Reference Information

#### Description and Operation

Engine Control Module Description

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

### Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. DTC P0602 or P0606 should not set.

⇒ | If DTC P0602 failed this ignition, program the ECM. If the DTC resets, replace the ECM.

⇒ | If DTC P0606 failed this ignition, clear the DTCs with a scan tool and verify the DTC does not reset. If DTC resets, replace the ECM.

2. Observe the DTC information with a scan tool. DTC P0601, P0603, P0604, P062B, P167D, P2107, or P2610 should not set.

⇒ | If a DTC failed this ignition, replace the ECM.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for engine control module replacement, setup, and programming