Initial Inspection and Diagnostic Overview

Perform before beginning System Diagnosis
- Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).

- Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems refer to Diagnostic Aids. Diagnostic Aids

- If any PCM codes are set, refer to Computers and Control Systems. Testing and Inspection

- Refer to System Diagnosis. System Diagnosis