Fault Detection/Management

Any detected malfunction of the APP sensor will not illuminate the malfunction indicator lamp (MIL).

An APP signal that is detected out of range high or low by the PCM will cause the engine to ignore the APP signal and will only allow the engine to operate at low idle.

CAUTION: The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no start condition. Installing the PCM connectors on an angle may cause an improper connection, misdiagnosis and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.

NOTE: Visually inspect the harness connectors for corrosion, damage, proper mating and correct pin tension.

NOTE: When the PCM is disconnected additional DTCs will be set. Clear all DTCs after restoring the vehicle.

Fig 1: Identifying PCM Body Harness Connector Terminals

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Sensor Connector Terminals (F-Super Duty/Excursion APP Connector)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Sensor Connector Terminals (E-Series APP Connector)

Courtesy of FORD MOTOR CO.

NOTE: Base idle should be no lower than 0.5 volt.