Normal Operation
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The on-demand 4WD system uses data from other systems as inputs to the 4X4 control module. The 4X4 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 4X4 control module loses communication with, or receives invalid data from any of the necessary modules, DTCs are set and the 4X4 control module may not allow 4WD operation.
Possible Causes
- Tire/axle out of range
- Active torque coupling
- 4X4 control module
- Circuit 57 open
- Circuit 704 (DG/LG) open
- Circuit 772 (LB) (non-hybrid vehicles) open or short to ground
- Circuit 774 (LG) (non-hybrid vehicles) open or short to ground
- Circuit 779 (BR) (hybrid vehicles) open or short to ground
- Circuit 778 (OG) (hybrid vehicles) open or short to ground
- Circuit 1003 (GY/YE) open