Symptom Chart

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.

In most circumstances, the PCM sets DTCs to help guide with diagnostics. Refer to the DTC Chart before using the symptom chart. The Condition column lists the vehicle condition. The Source 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 caused 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	Action
Unable to duplicate customer concern; no DTCs 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(s) Wiring, terminals or connectors ATC solenoid AWD relay module PCM	GO to Pinpoint Test A .
PTU mechanical failure		REFER to Transfer Case Power Transfer Unit (PTU) .
Wheels/tires		REFER to Wheels and Tires .
Active Torque Coupling Clutch		REFER to Rear Drive Axle/Differential .
Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line	Wheels/tires	REFER to Wheels and Tires .
Brake system		REFER to Brake System General Information .
Wheel bearings		REFER to Suspension System General Information .
Halfshafts		REFER to Driveline System General Information .
Wheel speed sensor(s)		REFER to Anti-Lock Brake System (ABS) and Stability Control .
ABS module		REFER to Anti-Lock Brake System (ABS) and Stability Control .
AWD relay module ATC solenoid Wiring, terminals or connectors Active Torque Coupling Clutch		GO to Pinpoint Test E .
Tire/axle out of acceptable range	Wheels/tires Wheel speed sensors ABS module	GO to Pinpoint Test B .