Diagnostic Aids
- DTC P0601 indicates that the contents of the EEPROM have changed since the ECM was programmed. The only possible repair is ECM replacement. Remember to program The replacement ECM with the correct software and calibration for the vehicle.
DTC P0601 - CONTROL MODULE MEMORY CHECKSUM
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Was the "On-Board Diagnostic (OBDII) System Check" performed? | - | Go to Step 2 | Go to On-Board Diagnostic (OBD-II) System Check |
| 2 | Install the test ECM. Program the test ECM (Immobilizer system). Refer to IMMOBILIZER SYSTEM . Check the OBD-II test for following condition:
Did the DTC disappear? |
- | Go to Step 3 | Go to Step 2 |
| 3 | Replace the original ECM. Check the poor connection between the ECM and ECM connector. Recheck the OBD -II test again. When the engine is started. Did the DTC disappear? |
- | Verify repair | Go to Step 4 |
| 4 | Disconnect the ABS control unit connector. Reprogramming the original ECM. (Engine control and Immobilizer control) Recheck the OBD -II. Did the DTC disappear? |
- | Verify repair | Go to Step 5 |
| 5 | Replace the ECM. Recheck the OBD -II test again. Did the DTC disappear? |
- | Verify repair | Refer to DIAGNOSTIC AIDS |