Engine Control Module: Testing and Inspection

Since the Powertrain Control Module (PCM) can have a failure which may affect only one circuit, following the diagnostic procedures can reliably tell when a failure has occurred in the PCM. Refer to Diagnostic Tables. Testing and Inspection

If the problem is intermittent - This means that the problem is not present at the time the system is being checked. In this case, refer to Symptoms and make a careful physical inspection of all portions of the system involved. Testing and Inspection