I was curious if you ever replaced the Tires! I was able to obtain some Good INFO Directly from WSM! Z
The AWD system consists of a PTU , driveshaft, front and rear halfshafts, AWD relay module, PCM which includes the AWD control logic and an ATC solenoid located in the rear axle. Based on inputs to the PCM, the PCM sends a command to the AWD relay module. The amount of torque sent to the rear wheels is controlled by the AWD relay module sending a PWM duty cycle to the ATC solenoid.
The PCM provides the brake system with its current clutch command torque level and determines wether or not the brake system may take command of the AWD clutch.If the compact spare tire is installed, the AWD system may disable automatically and enter FWD only mode to protect driveline components. This condition may be indicated by an AWD OFF message in the message center.
If there is an AWD OFF message in the message center from using the compact spare tire, this indicator should turn off after reinstalling the repaired or replaced normal road tire and cycling the ignition OFF and ON. It is recommended to reinstall the repaired or replaced road tire as soon as possible. Major dissimilar tire sizes between the front and rear axles could cause the AWD system to stop functioning and default to FWD or damage the AWD system.
AWD faults will be indicated by the powertrain malfunction (wrench) message center warning indicator in the IPC as well as the Check AWD message center warning indicator in the message center.
The PCM provides the brake system with its current clutch command torque level and determines wether or not the brake system may take command of the AWD clutch.
Heat Protection ( RDU )During very extreme off-road operation, the AWD system utilizes a heat protection mode to protect the AWD clutch from damage. If the AWD system detects an overheat condition, it enters a locked mode. If the heat in the AWD system continues to rise once in the locked mode, the PCM disables the ATC solenoid. This condition may be indicated by an AWD OFF message in the message center. To resume normal AWD function as soon as possible, stop the vehicle in a safe location and stop the engine for at least 10 minutes. After the engine is restarted and the AWD system has adequately cooled down, the AWD OFF message will turn off and normal AWD operation will return. In the event the engine is not stopped, the AWD OFF message will turn off when the system cools and normal AWD operation returns.
Visual Inspection ChartMechanical Electrical
ATC solenoid (part of rear axle)
PTU
RDU
Halfshafts and CV joints
Driveshaft and U-joints
Fluid leaks
Wheel/tire size and brand
Matching tire size and brand
Tire pressure
BJB fuse 70 (15A)
AWD relay
Wiring harness
Connector(s)
Circuitry
PCM