Engine and Fuel Controls

DTC P0601

DTC DESCRIPTORS

DTC P0601
Control Module Read Only Memory (ROM)

DTC P0602
Control Module Not Programmed

DTC P0604
Control Module Random Access Memory (RAM)

DTC P0606
Control Module Internal Performance

DTC P2610
Control Module Ignition Off Timer Performance

DIAGNOSTIC FAULT INFORMATION
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM) and the throttle actuator control (TAC) system. This diagnostic also addresses if the ECM is not programmed.

CONDITIONS FOR RUNNING THE DTC

P0601, P0602, and P0604
- The ignition is ON, or the engine is operating.
- The DTCs run once an ignition cycle.

P0606
- The ignition is ON, or the engine is operating.
- The ignition voltage is between 9-18 volts.
- The DTC runs continuous once the above conditions are met.

P2610
- The engine is running for at least 10 seconds.
- The ignition voltage is greater than 11 volts.
- The DTC runs once an ignition cycle.

CONDITIONS FOR SETTING THE DTC

P0601
The ECM detects that the checksum calculation does not match the expected checksum.

P0602
The controller is identified as a service replacement ECM.

P0604 or P0606
The ECM detects an internal condition for more than 3 seconds.

P2610
The ECM detects an error with the Ignition OFF timer.

ACTION TAKEN WHEN THE DTC SETS
- DTCs P0601, P0604, and P2610 are Type B DTCs.
- DTCs P0602 and P0606 are Type A DTCs.

CONDITIONS FOR CLEARING THE DTC
- DTCs P0601, P0604, and P2610 are Type B DTCs.
- DTCs P0602 and P0606 are Type A DTCs.

CIRCUIT/SYSTEM TESTING
1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0602 does not fail this ignition cycle.
- If DTC P0602 failed this ignition, reprogram the ECM. If DTC P0602 resets, replace the ECM.
2. Observe the DTC information with a scan tool. Verify that DTCs P0601, P0604, P0606, or P2610 do not set this ignition cycle.

IMPORTANT:
- A low battery condition or a battery that is disconnected and reconnect within 2 minutes may cause DTC P2610 to set.
- An intermittent condition at the ignition switch may cause DTC P2610 to set.
- A circuit condition with the ignition 1 or battery feed circuits to the ECM may cause DTC P2610 to set.
- A intermittent circuit condition with the ignition 1 or battery feed circuits to the ECM may cause DTC P2610 to set.
- If any of the DTCs P0601, P0604, P0606, or P2610 are set this ignition cycle replace the ECM.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests