Symptom Chart - Four-Wheel Drive Systems

WARNING: This page is about a different variant/trim than selected.

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

In most circumstances, the PCM sets DTCs to help guide with diagnostics. Refer to DTC Chart: AWD System - PCM before using the symptom chart. The Symptom column lists the vehicle condition. The Possible Sources column lists a detailed vehicle condition. The Action column lists the action to be performed to determine the cause of the condition. Each action lists the components that can cause the system and the individual components in that system. The components are listed in order of disassembly. Use the list of components and the required action to focus on disassembly inspections for the root cause of the concern.

Condition	Possible Sources	Actions
Unable to duplicate customer concern; no DTC present	The concern description is inaccurate	CARRY OUT the AWD System Functional Test. GO to Pinpoint Test A
Vehicle has no or inadequate torque at rear wheels	Fuse Wiring, terminals or connectors Active Torque Coupling (ATC) solenoid AWD Relay Module PCM	GO to Pinpoint Test C
	Wheels/tires	Check wheels and tires for damage. REFER to: Wheels and Tires .
	Rear axle	Check rear axle for damage. REFER to: Rear Drive Axle and Differential .
	PTU mechanical failure	Check PTU for damage. REFER to: Rear Drive Axle and Differential .
Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line	Wheels/tires	Check wheels and tires for damage. REFER to: Wheels and Tires .
	Wiring, terminals or connectors	GO to Pinpoint Test E
	Driveshaft	Check driveshaft for damage. REFER to: Driveshaft .
	Wiring, terminals or connectors Active Torque Coupling (ATC) solenoid AWD Relay Module	GO to Pinpoint Test E
	PTU mechanical failure	Check PTU for damage. REFER to: Power Transfer Unit - 6-Speed Automatic Transmission - 6F35 . REFER to: Power Transfer Unit - 6-Speed Automatic Transmission - 6F50/6F55 .
	Driveshaft	Check driveshaft for damage. REFER to: Suspension System .
	Wheel bearings	Check wheel bearings for damage. REFER to: Suspension System .
	ABS	CHECK the ABS. REFER to: Anti-Lock Brake System (ABS) and Stability Control .
-	Halfshafts	Check the halfshafts for damage. REFER to: Rear Drive Halfshafts .
Tire/axle out of acceptable range	Wheels/tires	GO to Pinpoint Test B