Power Transfer Unit (PTU)
WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The AWD system consists of the following:
- PTU
- Rear driveshaft
- AWD relay 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 AWD relay 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.