RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Transmission Position Switch/Sensor: Description and Operation
46RE (A-518) 4 Speed
46RE - Automatic Transmission
TRANSMISSION RANGE SENSOR
DESCRIPTION
The Transmission Range Sensor (TRS) (Fig. 260) has 3 primary functions:
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Provide a PARK/NEUTRAL start signal to the engine controller and the starter relay.
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Turn the Back-up lamps on when the transmission is in REVERSE and the engine (ignition) is on.
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Provide a transmission range signal to the instrument cluster.
The sensor is mounted in the transmission housing near the valve body, just above the pan rail. It's in the same position as the Park/Neutral switch on
other transmissions. The TRS contacts a cammed surface on the manual valve lever. The cammed surface translates the rotational motion of the manual
lever into the linear motion of the sensor. The cammed surface on the manual lever is comprised of two parts controlling the TRS signal: The insulator
portion contacts the switch poppet when the manual lever is not in PARK or NEUTRAL. The manual lever itself contacts the poppet when the lever is in
PARK or NEUTRAL; providing a ground for the signal from the starter relay and the JTEC engine controller.
