Lincoln F7TZ-7F293-AA Sensor Assembly

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On the 2005 and later Expedition/Navigator models, the Transmission Range sensor is incorporated into the transmission as part of the TCM and is not adjustable, and if it fails it must be replaced as an assembly. The Transmission Range (TR) sensor is fitted on the manual lever of the transmission and it informs the powertrain control module (PCM) not to start the engine if the selected gear is anything apart from Park or Neutral, and also lights up the back-up lamps once the transmission lever is shifted to Reverse. Starting with the engine other then in the PARK or NEUTRAL position may cause the metering of the TR sensor to be out of adjustment or the sensor itself could be defective and would require a functional test. If the car has air suspension system then the system should be turned off before lifting the car securely on jack stand. For the TR sensor it is suggested to use a special aligning tool and for those without the tool one can turn the ignition to on, shift to reverse and check back up lights. It is a sign that the sensor is bad if the lights come on but the engine begins to start in the wrong gear. Should the lights fail to come on, the shift cable should be disconnected, the sensor fasteners removed and the sensor positioned so as to turn on the lights and tighten the fasteners before reconnecting the cable. Sometimes after adjustment of the back-up lights, they may not glow; this should be an indication that the circuit has some problems. After all the tweaks, the vehicle should be lowered and, depending on the results of the work, air suspension system must be activated again. For replacement, the air suspension system should be once more deactivated, the vehicle heavily jacked up and then supported on jackstands and the electrical connector from the TR sensor disconnected. The shift cable should be disconnected and depending on type of transmission the manual shift lever may have to be also removed. The TR sensor retaining bolts must be undone and then the TR sensor. Removal on the other hand is done in reverse order while installation requires one to tighten the retaining screws, and adjust the sensor before lifting the vehicle and then activating the air suspension system, if it is equipped.

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.

Remove the center trim panel.

Unplug the electrical connector from the backside of the switch, and remove the mounting screws and switch (Remove the connector and mounting screws).

Place the vehicle securely on jackstands.

Remove the two shift range selector switch retaining screws.