Operation CHARM: Car repair manuals for everyone.

Visual Inspection

Visual Inspection
This inspection will identify modifications or additions to the vehicle operating system that may affect diagnosis.

Inspect vehicle for non-Ford approved add-on devices such as:
- Electronic add-on items:
- air conditioning
- generators (alternators)
- engine turbos
- cellular telephones
- cruise controls
- turbo engine brake
- CB radios
- linear amplifiers
- backup alarm signals
- electronic brakes for trailer towing
- computers
- Vehicle modifications.

These items, if not installed correctly, will affect Powertrain Control Module (PCM) or transmission function. Pay particular attention to add-on wiring splices in the PCM harness or transmission wiring harness, abnormal tire size or axle ratio changes. Leaks.