Mercury F7LZ-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.

To service the DTR sensor without a specialized tool, first disconnect the negative battery cable and set the shift lever to NEUTRAL. Securely raise the vehicle on jackstands. Access the DTR sensor on the left side of the transmission, disconnect its electrical connector, and disconnect the shift cable from the manual control lever. Remove the lever, mark the sensor's position before unmounting it. Ensure the transmission is in Neutral before reinstalling. Align the DTR sensor's Neutral marks with those on the inner and stationary rings, then slide it onto the manual lever shaft. Tighten the mounting bolts and recheck alignment. If needed, a dealer can refine alignment. Reverse these steps to complete the installation.

The Transmission Range (TR) sensor is mounted on the automatic transmission and senses the position of the gear selector as chosen by the driver. The TR sensor contains a series of resistors and switch contacts. Depending on the gear selector position, the sensor contacts route current through different combinations of resistors and produce voltage signals of different levels. The sensor sends these signals to the PCM, which uses them for a number of engine and transmission control operations. The TR sensor input affects operation of the EGA system, idle speed control, and transaxle torque converter lockup. The sensor also takes the place of the neutral safety switch used on older automatic transmissions. If the gear selector is not in Park or Neutral, the TR sensor will not let the starter motor operate. The Electronic Engine Control (EEC) system can detect sensor problems and set trouble codes to indicate specific faults. For the check and replacement procedures.

Disconnect the cable from the negative battery terminal. This precaution is emphasized to ensure safety during the alignment process.

After installing the switch, install the electrical connector.

Remove the two shift range selector switch retaining screws.

The PCM uses the signals from the TR sensor for a number of engine and transmission control operations.

The remainder of installation is the reverse of removal. Note: Use a new nut when installing the shift lever.

Install the bolts finger-tight. Precise adjustment of the sensor requires a special tool. If the tool is not available, adjust the sensor as follows: Connect the electrical sensor to the sensor, connect the negative battery cable and turn the ignition key On (engine not running). Shift the transmission into Reverse. Rotate the sensor until the back-up lights come on and tighten the mounting bolts.