Engine Control Module: Testing and Inspection

ENGINE CONTROL MODULE (ECM)
Check the internal control module ROM/RAM error.





CIRCUIT DIAGRAM





HARNESS INSPECTION PROCEDURE





TROUBLESHOOTING PROCEDURES

TROUBLESHOOTING HINTS
- If the ground wire of the ECM is not connected securely to ground, the ECM will not operate correctly.
- If we replace ECM ROM without further diagnosis, the problem may reoccur.