Visual Inspection: Notes

A visual inspection will identify modifications or additions to the vehicle operating system that may affect diagnosis. Inspect the vehicle for non-Ford factory add-on devices such as:

• Electronic add-on items:
  • air conditioning
  • generator (alternator)
  • engine turbo
  • cellular telephone
  • cruise control
  • CB radio
  • linear booster
  • backup alarm signal
  • computer
• Vehicle modification:

These items, if not installed correctly, will affect the PCM, transmission control module (TCM) 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; refer to Leakage Inspection .
• Correct linkage adjustments; refer to AUTOMATIC TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS article.