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 or electrical damage.VISUAL INSPECTION
Mechanical Electrical - Fuel fired booster heater assembly
- Coolant inlet/outlet
- Exhaust
- Fuel inlet
- Air inlet
- Auxiliary fuel pump and lines
- Auxiliary coolant pump
- Fuses
- Harnesses
- Electrical connector(s)
- Control module(s)
- 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.