RAM 3500 Truck 4WD V8-5.7L VIN D (2003)
Speed Sensor: Description and Operation
POSITION SENSOR
DESCRIPTION
The transfer case position sensor is an electronic device whose output can be interpreted to indicate the transfer case's current operating mode. The
sensor consists of a five position, resistive multiplexed circuit which returns a specific resistance value to the Powertrain Control Module (PCM) for
each transfer case operating mode. The sensor is located on the top of the transfer case, just left of the transfer case centerline and rides against the
sector plate rooster-comb. The PCM supplies 5VDC (±0.5 Volts) to the sensor and monitors the return voltage to determine the sector plate, and
therefore the transfer case, position.
OPERATION
During normal vehicle operation, the Powertrain Control Module (PCM) monitors the transfer case position sensor return voltage to determine the
operating mode of the transfer case. Refer to the Operating Mode Versus Resistance table for the correct resistance for each position (Fig. 96).
OPERATING MODE VERSUS RESISTANCE
