Symptom Chart

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS for information about these practices.

SYMPTOM CHART

Condition	Possible Sources	Action
The PCM does not respond to the scan tool	Fuse(s) Wiring, terminals or connectors PCM	REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication concern.
The differential oil pump never runs	Fuse(s) Wiring, terminals or connectors Temperature sensor Differential oil pump relay Differential oil pump PCM	RETRIEVE and RECORD all PCM DTCs. REFER to the PCM DTC Chart . If there are no DTCs present, GO to PINPOINT TEST D .
The differential oil pump runs continuously	Wiring, terminals or connectors Temperature sensor Differential oil pump relay PCM	RETRIEVE and RECORD all PCM DTCs. REFER to the PCM DTC Chart . If there are no DTCs present, GO to PINPOINT TEST D .