Symptom Chart: Four Wheel Drive (4WD) Systems

Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to ENGINE CONTROLS - DIAGNOSTIC METHODS (EXCEPT DIESEL & HYBRID) for information regarding Ford-specific diagnostic practices.

SYMPTOM CHART

Condition	Possible Sources	Actions
Unable to duplicate customer concern; no DTCs present	-	CARRY OUT the AWD System Functional Test. REFER to Diagnostic Routine A: All-Wheel Drive (AWD) System Functional Test .
Vehicle binds in a turn or resists turning, pulsates or shudders in a straight line	Wiring, terminals or connectors Matching wheel/tire size, brand and tread wear tire pressure	REFER to Diagnostic Routine E: Vehicle Binds in a Turn or Resists Turning, Pulsates or Shudders in a Straight Line .
Hill descent control inoperative/does not operate correctly	Fuse(s) Wiring, terminals or connectors	CARRY OUT the network test. If the scan tool communicates with the ABS, REFER to HILL DESCENT CONTROL . If the scan tool responds with no communication with the ABS, REFER to Diagnostic Routine B: The Anti-Lock Brake System (ABS) Module Does Not Respond To The Scan Tool .