This procedure is only for the 4R100 transmission, while the TorqShift uses a transmission range sensor within the transmission case that can only be replaced with special tool. The Transmission Range sensor, located at the manual lever or stick, is an information sensor for the power train control module (PCM) and, together with the TR code, replaces or supplements the functions of the conventional Park/Neutral switch-an ability to start the engine only if the shift lever is set to the Park or Neutral position or an engagement of the back-up lights if the lever is set to the Reverse position. If the engine is started by being in any other than Park or Neutral position, the TR sensor may be out of calibration or truly bad and should be checked for functionality. To check adjustment, safely jack up the car and when in the On position of the turn on switch and the gear shift lever in the Reverse position, the back up lights should turn on. If they do but the engine starts in any of the gears other than Park or Neutral, then sensor is probably bad. If back-up lights do not work, remove the
Shift Cable connected to the manual lever, remove and adjust the sensor and until the back-up light comes on tighten the bolts and put the shift cable to its rightful place. If the back-up lights are still not on, then there may be problem with the back-up lights or the circuit, and the sensor is most likely defective. For replacement remove the vehicle on jackstands, then disconnect the electrical connector from the TR sensor, detach the shift cable from the manual lever, and then remove the retaining bolts, in order to take out the TR sensor. Just as it was done during removal, installation is done in a reverse sequence with particular emphasis placed on the fact that the sensor retaining bolts should be tightened to the prescribed torque reviews the height of the vehicle and adjust the sensor as necessary before finally lowering the vehicle.