•  The PCM receives signals from the transfer case switch and other switches. It then activates one of two solenoids, causing a vacuum from the vacuum pump to be applied to the RFW actuator, and switching the remote freewheel (RFW) unit to lock or free.

•  To prevent reduced performance of the actuator as a result of a decrease in engine vacuum or vacuum pump, such as during acceleration or at high altitude operation, the actuation system includes a one-way check valve.

•  The switching mechanism of the RFW unit is a mechanical dog clutch on the left side of the front differential.

•  The RFW operation is controlled by PCM.