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

Test F: Vehicle Has No or Inadequate Torque at Rear Wheels
Refer to Vehicle/Diagrams, All Wheel Drive (AWD) 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, DTC's are set and the 4WD control module may not allow 4WD operation.

Possible Causes
- Tire/axle out of range
- Active torque coupling
- 4WD control module
- Power transfer unit (PTU)
- Circuit GD126GS (BK/WH) open
- Circuit SBP15X (WH/RD) open
- Circuit CCF21A (VT/WH) open or short to ground
- Circuit RCF21B (WH/VT) open or short to ground
- Circuit CBP19AJ (BN/WH) open

NOTE: Conduct Steps 1 through 10 outlined in Inspection and Verification prior to carrying out this test. Inspection and Verification

F1-F4:

F4-F6:

F6-F8:

F8-F9:

F10-F12: