Test J: Tire/Axle Out of Acceptable Range

Pinpoint Test J: Tire/Axle Out Of Acceptable Range

Normal Operation
The 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.

Test J1-J5:

Possible Causes
^ wheels/tires
^ wheel speed sensors
^ ABS module
^ 4WD control module

CAUTION: This test must be carried out on a hard surface in a vacant area without traffic.

NOTE: Conduct steps outlined in Inspection and Verification prior to this test. Initial Inspection and Diagnostic Overview