Operation CHARM: Car repair manuals for everyone.

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
+ CB radios
+ linear amplifiers
+ backup alarm signals
+ electronic brakes for trailer towing
+ computers

- Vehicle modifications.

These items, if not installed properly, will affect powertrain control module or transmission function. Pay particular attention to add-on wiring splices in the powertrain control module harness or transmission wiring harness, abnormal tire size or axle ratio changes.

- Leaks.