Grand Cherokee 4WD V8-4.7L Flex Fuel (2009)
Gear Sensor/Switch: Description and Operation
Mode Sensor - Description
DESCRIPTION
The transfer case mode sensor (3) provides the Final Drive Control Module (FDCM) feedback about the position of the transfer case. The sensor consists
of a linear analog position sensor that converts the motor output shaft position into a DC signal. The sensor may rotate a full 360 degrees. The FDCM
must supply 5VDC (+/- 0.5v) to the sensor whenever the FDCM is not in sleep mode and monitors the shift motor position. The sensor position is
monitored when the ignition is in the RUN position and for 10 seconds after the ignition is shifted to the OFF position. The sensor is mechanically linked
to the shaft of the cam which allows the transfer case to shift. The mode sensor will draw less than 20 mA of current during operation.
