• | 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. |
This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed.
The checksum calculation at power down in the last drive cycle completely finished. DTC P0601 runs once an ignition cycle.
The ignition is ON, with the engine OFF. DTC P0602 runs continuously.
The read/write test at power down in the last drive cycle completely finished. DTC P0604 runs once an ignition cycle.
DTC P0606 runs continuously with ignition ON or engine operating.
The ECM detects the incorrect read only memory (ROM) checksum for more than 30 seconds.
The ECM detects that programming is incomplete for more than 1 second.
The ECM detects random access memory (RAM) errors for more than 5 seconds.
The ECM detects an internal condition for more than 5 seconds.
DTCs P0601, P0602, P0604, and P0606 are Type A DTCs.
DTCs P0601, P0602, P0604, and P0606 are Type A DTCs.
⇒ | If DTC P0602 failed this ignition, program the ECM. If the DTC resets, replace the ECM. |
⇒ | If DTC P0606 is set with P0638, P2101, or P2119, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis. |
⇒ | 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. |
⇒ | If DTC P0601 or P0604 failed this ignition, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming