Inspection And Verification
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT
acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical damage.
Visual Inspection
MECHANICAL ELECTRICAL - Starter motor
- Engine (turns freely)
- Battery
- Fuse(s)
- Wiring harness(es)
- Damaged, loose or corroded connectors
- Ignition switch
- Starter relay
- Transmission Control Module (TCM)
- Engine Control Module (ECM)
- If an obvious cause for an observed or reported condition is found, correct the cause (if possible) before proceeding to the symptom chart.
- If the cause is not visually evident, verify the symptom and refer to the SYMPTOM CHART , alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC INDEX .
- Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as needed.