Power Transfer Unit - Overview

The AWD  system consists of the following:

• Power Transfer Unit (PTU)
• Rear driveshaft
• AWD  control module
• Rear axle with coupling device

The Power Transfer Unit (PTU) is a mechanical device attached to the transmission. It supplies torque to the rear axle through the rear driveshaft. The AWD  control module is an electronic device which controls the rear axle coupling to apply the torque generated from the Power Transfer Unit (PTU) to the rear wheels when required.