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Test H: Tire/Axle Out of Acceptable Operating Range
Pinpoint Test H: Tire/Axle Out of Acceptable Operating RangeRefer to Vehicle/Diagrams, All Wheel Drive (AWD) Systems for schematic and connector information.
Normal Operation
The four wheel drive (4WD) system continuously monitors vehicle conditions and automatically adjusts the torque distribution between the front and rear wheels. During normal operation, most of the torque is sent to the front wheels. If wheel slip between the front and rear wheels is detected, or if the vehicle is under heavy acceleration, the 4WD system increases the torque to the rear wheels to prevent or control wheel slip.
The 4WD control module varies the torque sent to the rear wheels by sending a duty cycle to the active torque coupling located inside the rear axle. The 4WD control module also provides the brake system with its current clutch duty cycle and whether or not the brake system may take command of the clutch duty cycle.
Possible Causes
^ Wheels/tires
^ Wheel speed sensors
^ Anti-lock brake system (ABS) module
^ 4WD control module
PINPOINT TEST H: TIRE/AXLE OUT OF ACCEPTABLE OPERATING RANGE
