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:
- A/C
- 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 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.

Selector Lever Linkage Check

Check for a misadjustment in selector lever linkage by matching the detents in the selector lever with those in the transmission. If they match, the misadjustment is in the indicator. Do not adjust the selector lever linkage.

Hydraulic leakage at the manual control valve can cause delay in engagements and/or slipping while operating if the selector lever linkage is not correctly adjusted. Refer to Section 307-05 for selector lever linkage adjustment.

Check TSBs

Refer to all TSBs that pertain to the transmission concerns, and follow the procedure outlined.

Carry out On-Board Diagnostic (OBD)

NOTE: If equipped, turn the Power Take-Off (PTO) unit off to make sure test results are correct. For a description of PTO operation, refer to Transmission Electronic Control System in this section. On-Board Diagnostic (OBD) is not accessible when the PTO is in operation.

After a road test, with the engine and transmission at normal operating temperature and before disconnecting any connectors, using the scan tool perform the Self Test procedure. Refer to Computers and Control Systems for diagnosis and testing of the PCM.