Visual Inspection

This 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 amplifiers
  • Backup alarm signal
  • Computer
• Vehicle modification:
  • These items, if not installed correctly, will affect the 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. Refer to LEAKAGE INSPECTION .
  • Correct linkage adjustments. Refer to AUTOMATIC TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS .

Shift Linkage Check 

Hydraulic leakage at the manual control valve can cause delay in engagements and/or slipping while operating if the linkage is not correctly adjusted. Refer to AUTOMATIC TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS for shift linkage adjustment.

Check TSB 

Refer to all technical service bulletins which pertain to the concern and follow the procedure.

Carry Out On-Board Diagnostics (KOEO, KOER) 

After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using the scan tool. Refer to the INTRODUCTION - GASOLINE article for diagnosis and testing of the powertrain control system.