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 and transmission operation.
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 or transmission function. Pay particular attention to add-on wiring splices in the Powertrain Control Module (PCM) harness or transmission wiring harness, abnormal tire size or axle ratio changes.
Leaks.