Engine Controls and Fuel (ECM)

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

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 P0607
- Control Module Performance

DTC P062B
- Control Module Fuel Injector Control Performance

DTC P167D
- Control Module Ignition Coil 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.

P0607
* The engine is running or cranking.
* DTC P0607 runs continuously when the above condition is met

P062B
* The engine speed is greater than 80 RPM.
* The ignition voltage is between 8-18 volts.
* DTC P062B runs continuously when the above condition is met.

P167D
* The engine is operating.
* The engine speed is less than 5,000 RPM.
* The ignition voltage is between 9-18 volts.
* DTC P167D runs continuously once the conditions above are met.

P2610
* The engine has cycled ON and OFF between 6-16 times dependent on coolant temperature.
* DTC P2610 runs continuously once the above condition is met and the real time clock is active.

Conditions for Setting the DTC

P0601

The ECM detects the incorrect read only memory (ROM) checksum for greater than 1 second.

P0602

The ECM detects that programming is incomplete for greater than 1 second.

P0603

The ECM detects an error during the shut down path test for 1 second.

P0604

The ECM detects random access memory (RAM) errors for greater than 1 second.

P0606

The ECM detects an internal software error within the throttle actuated control (TAC) system for greater than 1 second.

P0607

The ECM detects an internal error for greater than 1 second.

P062B

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

P167D

The ECM detects a condition with the integrated circuits of the ignition driver module for greater than 4 seconds.

P2610

The ECM detects the engine off timer is not valid for greater than 1 second.

Action Taken When the DTC Sets

* DTCs P0601, P0602, P0603, P0604, and P0606 are Type A DTCs.
* DTC P0607 is a Type C DTC.
* DTC P062B, P167D, and P2610 are Type B DTCs.

Conditions for Clearing the DTC

* DTCs P0601, P0602, P0603, P0604, and P0606 are Type A DTCs.
* DTC P0607 is a Type C DTC.
* DTC P062B, P167D, and P2610 are Type B DTCs.

Diagnostic Aids

A low battery condition may cause DTC P0607 to set.

Reference Information
Description and Operation

Engine Control Module Description (Engine Control Module Description)
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)

Circuit/System Verification

1. Ignition OFF, open the hood to disable the Auto-Stop function.
2. Ignition ON, verify the scan tool hood position parameter displays Open.

• If the hood position does not display Open, refer to DTC P254F (P254F).

3. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0562 is not set.

• If DTC P0562 is set refer to DTC P0562 (P0562).

4. 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.

5. Observe the DTC information with a scan tool. DTC P0601, P0603, P0604, P0607, P062B, P167D or P2610 should not set.

• If a DTC failed this ignition, replace the ECM.

6. 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 (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for engine control module replacement, setup, and programming