Symptom Chart - Four-Wheel Drive (4WD) System

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

SYMPTOM CHART - FOUR-WHEEL DRIVE (4WD) SYSTEM

Condition	Possible Sources	Action
Unable to duplicate customer concern; no DTCs present	The concern description is inaccurate	CARRY OUT the All-Wheel Drive (AWD) System Functional Test. GO to PINPOINT TEST A .
Battery voltage is high/low (4X4 control module)	Concern with voltage regulator or generator Smart Junction Box (SJB) fuse 11 (10A) SJB fuse 35 (10A) Intermittent open power circuit 4X4 control module internal relay failure	GO to PINPOINT TEST B .
4X4 control module received no/invalid data from PCM	Invalid data received from PCM Data out of range	REFER to INTRODUCTION article to diagnose the accelerator position, engine coolant or keep alive memory fault.
4X4 control module received no/invalid data from ABS module	Invalid data received from the ABS module Data out of range	GO to PINPOINT TEST C .
High Speed Controller Area Network (HSCAN) communications bus fault	HS-CAN bus fault PCM fault ABS fault Instrument Cluster (IC) fault 4X4 control module	REFER to MODULE COMMUNICATIONS NETWORK article.
Vehicle has no or inadequate torque at rear wheels	Rear axle	REFER to REAR DRIVE AXLE & DIFFERENTIAL - FORD 8.8-INCH RING GEAR article.
Power Transfer Unit (PTU) mechanical failure		REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
Wheels/tires Active Torque Coupling (ATC) solenoid (part of rear axle) SJB fuse(s): 11 (10A) 35 (10A) 4X4 control module		GO to PINPOINT TEST F .
Circuitry		GO to PINPOINT TEST D .
Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line	Wheels/tires	REFER to TIRES & WHEELS article.
Brake system		REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
Wheel bearings		REFER to SUSPENSION SYSTEM - GENERAL INFORMATION article.
Halfshafts		REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
Wheel speed sensor(s)		REFER to ANTI-LOCK BRAKE SYSTEM - VEHICLE DYNAMIC SYSTEM article.
ABS module		REFER to ANTI-LOCK BRAKE SYSTEM - VEHICLE DYNAMIC SYSTEM article.
4X4 control module ATC solenoid (part of rear axle) Circuitry		GO to PINPOINT TEST E .
Tire/axle out of acceptable range	Wheels/tires Wheel speed sensors ABS module 4X4 control module	GO to PINPOINT TEST F .