Inspection And Verification

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.
1 Verify the customer concern.
- Note that intermittent fault reports may be due to the cycling operation of the field effect transistors (FETs)
2 Visually inspect for obvious mechanical or electrical faults.





3 If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4 Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
- Because the DTCs are stored in more than one module, a complete vehicle read is recommended
- Make sure that all DTCs are cleared following rectification