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Test D: Transmission Range Sensor

WARNING: This page is about a different variant/trim than selected.

  1. Electronic Diagnostics

    Disconnect TR sensor connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Reconnect TR sensor connector. Ensure TR sensor is correctly adjusted. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. If sensor requires adjustment, clear DTCs after adjustment. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING. If sensor is correctly adjusted, go to next step.

  2. Check Electrical Signal Operation

    Ensure ignition is off. Disconnect TR sensor harness connector. Turn ignition on. Measure voltage between harness connector terminals No. 4 and 5. See TR SENSOR WIRE COLOR IDENTIFICATION  table. If voltage is 4.75-5.25 volts, go to next step. If voltage is not 4.75-5.25 volts, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE to diagnose no reference voltage.

  3. Check Continuity Of TR Sensor Circuits

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. Measure and record resistance between breakout box test pin terminal No. 91 and TR sensor harness connector terminal No. 4. Measure and record resistance between breakout box test pin terminal No. 64 and TR sensor harness connector terminal No. 5. See TR SENSOR WIRE COLOR IDENTIFICATION  table. If each resistance reading is less than 5 ohms, go to next step. If any resistance reading is more than 5 ohms, repair open circuit. See WIRING DIAGRAMS . Remove breakout box and connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  4. Check TR Sensor Circuit For Shorts To Power And Ground

    Measure resistance between breakout box test pin No. 64 and test pins No. 24, 51, 71, 77, 91, 97 and 103. Measure resistance between breakout box test pin No. 64 and chassis ground. If each resistance reading is more than 10 k/ohms, go to next step. If any resistance reading is less than 10 k/ohms, repair short circuit. See WIRING DIAGRAMS . Remove breakout box and connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  5. Check TR Sensor Resistance

    Install TR sensor overlay on transmission tester. Connect tester to TR sensor. Check continuity and resistances in all positions. See Fig 1. If TR sensor does not operate within specification, replace sensor. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING. If sensor operates within specification, replace PCM. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES . Repeat QUICK TEST .

  6. Check Park/Neutral Circuits Of Sensor

    Monitor transmission tester indicator lights while moving gearshift lever through all positions. If indicator light display matches gearshift lever position, go to next step. If indicator light display does not match gearshift lever position, replace TR sensor. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  7. Check Reverse/Back-Up Light Circuits Of Sensor

    Monitor transmission tester indicator light while moving gearshift lever to "R" position. Verify if back-up lights are illuminated. If indicator light display matches gearshift lever position and back-up lights operate correctly, system is currently operating correctly. If indicator light display does not match gearshift lever position and/or back-up lights are not illuminated, replace TR sensor. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.
TR SENSOR WIRE COLOR IDENTIFICATION

Terminal No. Wire Color
4 Brown/Green
5 White/Green
Fig 1: TR Sensor Resistance Specification Chart
G94F36728Courtesy of FORD MOTOR CO.
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