Four Wheel Drive (4WD) Systems

Four Wheel Drive (4WD) Systems
The electronic shift four wheel drive (4WD) system consists of the following components:
^ Transfer case
^ 4X4 control module
^ Mode select switch (MSS)
^ Transfer case shift motor
^ Instrument cluster (IC indicators)

The transfer case is connected to the transmission output shaft and is responsible for transmitting power through the rear drive shaft to the rear axle, and through the front drive shaft to the front axle. The electronic shift is the only type of transfer case used.

The system has a rear wheel drive (RWD) mode, 4x4 HIGH mode and a 4x4 LOW range mode. When the MSS on the instrument panel is turned, the 4X4 control module powers the transfer case shift motor. When the shift motor reaches the desired position, as determined by the contact plate position inputs to the 4X4 control module, power to the shift motor will be removed.