Symptom Chart - Four Wheel Drive (4WD) System

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SYMPTOM CHART - FOUR WHEEL DRIVE (4WD) SYSTEM

Condition	Possible Sources	Action
The concern is unverifiable; no DTCs present	The concern description is inaccurate	CARRY OUT the All Wheel Drive (AWD) System Functional Test. Go to Pinpoint Test A .
The power transfer unit (PTU) makes noise	Tire inflation pressure Tire and wheel size	MAKE SURE all tires and wheels are the same size and brand and the inflation pressures are correct.
	Fluid level	FILL with the correct type and amount of lubricant. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
	Internal components	OPERATE the vehicle in all gears. If there is noise in the transaxle in NEUTRAL, or in some gears and not in others, REMOVE and REPAIR the transaxle. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 6F50 article. If there is noise in all gears, INSTALL a new PTU. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
4X4 control module battery voltage is high or low	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 - Gasoline Engines 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 (HS-CAN) communications bus fault	HS-CAN bus fault PCM fault ABS fault Instrument cluster (IC) fault 4X4 control module	Go to Pinpoint Test D .
Vehicle has no or inadequate torque at rear wheels	Rear axle	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	PTU mechanical failure	REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
	Wheels/tires Active torque control coupling (ATCC) solenoid (part of rear axle) SJB fuse(s): 11 (10A) 35 (10A) 4X4 control module	Go to Pinpoint Test G .
	Circuitry	Go to Pinpoint Test E .
Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line	Wheels/tires	REFER to WHEELS AND TIRES 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 VEHICLE DYNAMIC SYSTEMS article.
	ABS module	REFER to VEHICLE DYNAMIC SYSTEMS article.
	4X4 control module ATCC solenoid (part of rear axle) Circuitry	Go to Pinpoint Test F .
Tire/axle out of acceptable operating range	Wheels/tires Wheel speed sensors ABS module 4X4 control module	Go to Pinpoint Test G .