Power Transfer Unit (PTU)
WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The All-Wheel Drive (AWD) system consists of the following:
- Power Transfer Unit (PTU)
- Rear driveshaft
- 4X4 control module
- Rear axle with coupling device
The PTU is a mechanical device attached to the transaxle. It supplies torque to the rear axle through the rear driveshaft. The 4X4 control module is an electronic device which controls the rear axle coupling to apply the torque generated from the PTU to the rear wheels when required.