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 and electrical damage.
Visual Inspection
Mechanical Electrical - Gear selector lever cable adjustment (vehicles with automatic transmission)
- Starter motor
- Engine (turns freely)
- Battery
- Fuses
- Starter relay
- Wiring harness(es)
- Damaged, loose or corroded connectors
- Ignition switch
- Generator
- Transmission Control Module (TCM)
- Engine Control Module (ECM)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- 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.