Engine Controls

DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

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 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.

P0602
The ignition is ON, with the engine OFF. DTCP0602 runs continuously when the ignition is ON for more than 1 second.

P0603
^ The ignition is ON.
^ The power down calculation in the last drive cycle was completely finished.

P0604
The read/write test at power down in the last drive cycle completely finished. DTC P0604 runs once an ignition cycle.

P0606
DTC P0606 runs continuously with ignition ON or engine operating.

P2610
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 the incorrect read only memory (ROM) checksum.

P0602
The ECM detects that programming is incomplete for more than 4 seconds.

P0603
The ECM detects an error during the shut down path test.

P0604
The ECM detects random access memory (RAM) errors.

P0606
The ECM detects an internal error.

P2610
The ECM detects the engine off timer is not valid for more than 4 seconds or for a cumulative of 50 seconds.

Action Taken When the DTC Sets
^ DTCs P0601, P0602, P0603, P0604, and P0606 are Type A DTCs.
^ DTC P2610 is a Type B DTC.

Conditions for Clearing the DTC
^ DTCs P0601, P0602, P0603, P0604, and P0606 are Type A DTCs.
^ DTC P2610 is a Type B DTC.

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, 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. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information