Power Transfer Unit (PTU) Operation

The PTU has four (4) modes of operation:  Connected, Connecting, Disconnected, and Disconnecting. Each mode is commanded by the AWD module. The power transfer unit contains a reversible DC motor and two hall effect position sensors. The motor moves the shift fork which connects or disconnects the dog clutch collar. power transfer unit position sensor A monitors the position of the actuator cam. power transfer unit position sensor B monitors the position of the shift fork. Some power transfer unit models are equipped with an oil temperature sensor.