Test F: Vehicle Has No or Inadequate Torque at Rear Wheels

Pinpoint Test F: Vehicle Has No or Inadequate Torque at Rear Wheels
Refer to Vehicle/Diagrams, Four Wheel Drive (4WD) Systems for schematic and connector information.

Normal Operation
The on-demand four wheel drive (4WD) system uses data from other systems as inputs to the 4WD control module. The 4WD control module uses the inputs to determine the appropriate duty cycle to send to the active torque coupling that delivers the desired torque to the rear wheels. If the 4WD control module loses communication with, or receives invalid data from any of the necessary modules, DTCs are set and the 4WD control module may not allow 4WD operation.
^ DTC P1824 4WD Clutch Relay Circuit Failure -When the 4WD control module detects a 4WD solenoid short to ground or short to battery on the active torque coupling feedback circuit, this DTC is set.
^ DTC P1825 4WD Clutch Relay Open Circuit -When the 4WD control module detects an open on the active torque coupling command or feedback circuit, this DTC is set.

This pinpoint test is intended to diagnose the following:
^ Tire/axle out of range
^ Active torque coupling
^ Power transfer unit (PTU)
^ Wiring, terminals or connectors

F1:

F2-F4:

F4-F6:

F6-F8:

F8-F9:

F10-F12: