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Pinpoint Test C: Transmission Range Sensor (TRS)

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the TRANSMISSION VEHICLE HARNESS CONNECTOR  illustration within the Transmission Connector Layouts procedure.
NOTE: Refer to the TRANSMISSION INTERNAL HARNESS CONNECTOR  illustration within the Transmission Connector Layouts procedure.
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to DIAGNOSTIC PARAMETERS IDENTIFICATION (PID) CHART .
  1. C1 VERIFY THE DTCs 
    • Select PARK.
    • Ignition ON.
    • Carry out On-Board Diagnostic (OBD) Test.
    • Are only Transmission Range (TR) sensor DTCs present? 
    • Yes  : GO to  C3.
    • No  : GO to C2.
  2. C2 VERIFY THE SELECTOR LEVER CABLE ADJUSTMENT 
  3. C3 CHECK THE ELECTRICAL SYSTEM OPERATION (START AND REVERSE) 
    • Select PARK.
    • Start the engine.
    • Ignition OFF.
    • Select NEUTRAL.
    • Start the engine.
    • Select PARK.
    • Ignition OFF.
    • Select REVERSE.
    • Ignition ON.
    • Check the reverse lamp illumination.
    • Does the engine crank in PARK and NEUTRAL and do the reverse lamps illuminate? 
    • Yes  : The problem is not in the TR sensor. REFER to STARTING SYSTEM - GASOLINE ENGINES for further diagnosis of the starting system and reverse lamps.
    • No  : GO to C4.
  4. C4 CHECK THE ELECTRICAL SYSTEM OPERATION [TR POSITION SENSOR AND PCM] 
    • Select PARK.
    • Ignition OFF.
    • Check to make sure the transmission vehicle harness C1385 is fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Monitor the following PIDs: TR_DC and TR_FREQ.
    • Move the selector lever into each gear and stop.
    • Observe the PIDs: TR_DC and TR_FREQ.
    • Monitor PID: TR_FREQ.
    • Compare the PID: TR_DC to the TR position Duty Cycle Chart.
      TR_DC DUTY CYCLE CHART

      Position Min % Duty Cycle Max % Duty Cycle
      P 7.13 23.76
      R 23.77 38.48
      N 38.49 48.55
      D 48.56 58.82
      3 58.83 68.08
      2 68.09 77.96
      1 77.97 90.34
    • Is the PID: TR_FREQ in the range of 100 to 150 Hz? Is the PID: TR_DC in the TR position Duty Cycle range? Does PID: TR_DC remain steady when the harness is wiggled or the vehicle is driven? 
    • Yes  : The problem is not in the TR sensor system. REFER to DIAGNOSIS BY SYMPTOM  for additional diagnosis.
    • No  : If TR_DC changes when wiggling the harness or driving the vehicle, the problem may be intermittent.

      GO to C5.

  5. C5 CHECK THE HARNESS CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Transmission Vehicle Harness C1385.
    • Disconnect: PCM C175T.
    • Disconnect: Output Shaft Speed (OSS) Sensor C193.
    • Disconnect: Turbine Shaft Speed (TSS) and Intermediate Shaft Speed Sensor C1387.
    • Check to make sure the C1385, C175T and C192 terminals are fully engaged in the connector and are in good condition before proceeding.
    • Measure the resistance between transmission vehicle harness C1385 and PCM C175T using the following chart.
      Transmission Connector Circuit PCM
      C1385-21 LE111 (VT/GN) C175T-3
      C1385-17 RET24 (BN/BU) C175T-41
      C1385-15 CET22 (GY/BN) C175T-12
      Fig 1: Measuring Resistance Between Transmission Vehicle Harness C1385 And PCM C175T
      G07482153Courtesy of FORD MOTOR CO.
    • Is resistance less than 5 ohms? 
    • Yes  : GO to C6.
    • No  : REPAIR the faulty circuit. CLEAR the DTCs. TEST the system for normal operation.
  6. C6 CHECK THE HARNESS CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between transmission vehicle harness C1385 and ground using the following chart.
      Transmission Connector Circuit Ground
      C1385-21 LE111 (VT/GN) Ground
      C1385-17 RET24 (BN/BU) Ground
      C1385-15 CET22 (GY/BN) Ground
      Fig 2: Measuring Resistance Between Transmission Vehicle Harness C1385 And Ground
      G06775644Courtesy of FORD MOTOR CO.
    • Is resistance greater than 10, 000 ohms? 
    • Yes  : GO to C7.
    • No  : REPAIR the faulty harness circuit. CLEAR the DTCs. TEST the system for normal operation.
  7. C7 CHECK THE INTERNAL HARNESS FOR AN OPEN 
    • Drain the transmission fluid.
    • Remove the transmission fluid pan.
    • Remove the transmission fluid filter.
    • Disconnect: TR Sensor.
    • Measure the resistance between transmission internal harness C1385 and the component using the following chart.
      Transmission Connector Component Terminal Number
      C1385-21 TR sensor 1
      C1385-17 TR sensor 2
      C1385-15 TR sensor 3
      Fig 3: Measuring Resistance Between Transmission Internal Harness C1385 And Component
      G06775645Courtesy of FORD MOTOR CO.
    • Is resistance less than 5 ohms? 
    • Yes  : GO to C8.
    • No  : INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
  8. C8 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND 
    • Measure the resistance between transmission internal harness C1385 and ground component side using the following chart.
      Transmission Connector Ground
      C1385-15 Ground
      C1385-17 Ground
      C1385-21 Ground
      Fig 4: Measuring Resistance Between Transmission Internal Harness C1385 And Ground
      G06775646Courtesy of FORD MOTOR CO.
    • Is resistance greater than 10, 000 ohms? 
    • Yes  : INSTALL a new TR sensor. REFER to TRANSMISSION RANGE (TR) SENSOR . CLEAR the DTCs.
    • No  : INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
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