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 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. DTC P0602 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. |
Reference Information
Description and Operation
Engine Control Module Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
- Ignition ON, observe the DTC information with a scan tool. DTC P0602 or P0606 should not set.
- Observe the DTC information with a scan tool. DTC P0601, P0603, P0604, or P2610 should not set.
- 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.
| ⇒ | 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. |
Important: A low battery condition can cause DTC P0603 to set. Verify the starting and charging system is in good condition when diagnosing DTC P0603. Refer to Charging System Test .
| ⇒ | If a DTC failed this ignition, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming
