CAUTION: Diagnosis by substituting a component from another vehicle is NOT allowed. Substitution of control modules does not guarantee confirmation of the fault and, in addition, may cause additional faults in the vehicle being tested and/or in the vehicle from which the modules are removed.
1. Visually inspect for obvious signs of mechanical or electrical damage and system integrity.
Mechanical factors | Electrical Factors |
2. If there is an obvious cause for a problem you identified or described by a customer, resolve it before proceeding with the next steps (if possible).
3. If the cause is not visually obvious, check for DTCs and refer to the Diagnostic Trouble Code Index (DTC).
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