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 tested and/or the donor vehicle.
- Verify the customer concern.
- Visually inspect for obvious signs of damage and system integrity.
Visual Inspection
MECHANICAL ELECTRICAL - Check for stuck/jammed switches and buttons
- Visibly damaged or worn components
- Loose or missing fasteners
- Fuse(s)
- Loose or corroded electrical connector(s)
- Transmission control module
- Transmission control switch
- 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, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index .