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Pinpoint Test H: TR Sensor

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transmission Vehicle Harness Connector illustration Transmission Connector Layouts .
NOTE: Refer to the Transmission Internal Harness Connector illustration Transmission Connector Layouts .
NOTE: Read and record all DTCs.
NOTE: Use the Diagnostic Parameters Identification (PID) Chart for available diagnostic PIDs. Refer to Diagnostic Parameters Identification (PID) Chart .
  1. H1 VERIFY THE DTCs 
    • Select PARK.
    • Key in ON position.
    • Carry out On-Board Diagnostic (OBD) Test.
    • Are only Transmission Range (TR) sensor DTCs present? 
    1. YES  : Go to  H3.
    2. NO  : Go to  H2.
  2. H2 VERIFY THE SELECTOR LEVER CABLE ADJUSTMENT 
    1. YES  : Go to  H3.
    2. NO  : ADJUST the selector lever cable. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS article. Go to  H3.
  3. H3 CHECK THE ELECTRICAL SYSTEM OPERATION (START AND REVERSE) 
    • Select PARK.
    • Key in START position.
    • Key in OFF position.
    • Select NEUTRAL.
    • Key in START position.
    • Select PARK.
    • Key in OFF position.
    • Select REVERSE.
    • Key in ON position.
    • Check the reverse lamp illumination.
    • Does the engine crank in PARK and NEUTRAL and do the reverse lamps illuminate? 
    1. YES  : The problem is not in the TR sensor. REFER to STARTING SYSTEM - DIESEL ENGINE article for further diagnosis of the starting system and reverse lamps.
    2. NO  : Go to  H4.
  4. H4 CHECK THE ELECTRICAL SYSTEM OPERATION [TR POSITION SENSOR AND TCM] 
    • Select PARK.
    • Key in OFF position.
    • 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 diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic 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 theTR position Duty Cycle range? 

      Does PID: TR_DC remain steady when the harness is wiggled, the sensor is tapped or the vehicle is driven? 

    1. YES  : The problem is not in the TR sensor system. REFER to Diagnosis By Symptom for additional diagnosis.
    2. NO  : If TR_DC changes when wiggling the harness, tapping on the sensor or driving the vehicle, the problem may be intermittent.

      Go to  H5.

  5. H5 CHECK THE HARNESS CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Transmission vehicle harness C1385
    • Disconnect: TCM C1750
    • Disconnect: Output Shaft Speed (OSS) Sensor C193
    • Disconnect: Turbine Shaft Speed (TSS)/Intermediate Shaft Speed Sensor C1387
    • Check to make sure the C1385, C1750, C193 and C1387 terminals are fully engaged in the connector and are in good condition before proceeding.
      • Fig 1: Checking Harness Circuits For An Open
      GF0049276Courtesy of FORD MOTOR CO.
    • Measure the resistance between transmission vehicle harness C1385 and TCM C1750 using the following chart.
      Transmission Connector Circuit TCM
      C1385-21 LE111 (VT/GN) C1750-20
      C1385-17 CET22 (GY/BN) C1750-45
      C1385-15 RET24 (BN/BU) C1750-49
    • Are the resistances less than 0.5 ohm? 
    1. YES  : Go to  H6.
    2. NO  : REPAIR the faulty circuit. CLEAR the DTCs. TEST the system for normal operation.
  6. H6 CHECK THE HARNESS CIRCUITS FOR A SHORT TO GROUND 
      Fig 2: Checking Harness Circuits For A Short To Ground
      GF0044743Courtesy of FORD MOTOR CO.
    • 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 CET22 (GY/BN) Ground
      C1385-15 RET24 (BN/BU) Ground
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  H7.
    2. NO  : REPAIR the faulty harness circuit. CLEAR the DTCs. TEST the system for normal operation.
  7. H7 CHECK THE INTERNAL HARNESS FOR AN OPEN 
    • Drain the transmission fluid.
    • Remove the transmission fluid pan.
    • Remove the transmission fluid filter.
    • Disconnect: TR sensor
      • Fig 3: Checking Internal Harness For An Open
      GF0044744Courtesy of FORD MOTOR CO.
    • Measure the resistance between transmission internal harness C1385 and the component using the following chart.
      Transmission Connector Component Pin Number
      C1385-21 TR sensor 1
      C1385-17 TR sensor 2
      C1385-15 TR sensor 3
    • Are the resistances greater than 0.5 ohm? 
    1. YES  : INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
    2. NO  : Go to  H8.
  8. H8 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND 
      Fig 4: Checking Internal Harness For A Short To Ground
      GF0044745Courtesy of FORD MOTOR CO.
    • 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
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : INSTALL a new TR sensor. REFER to Digital Transmission Range (TR) Sensor . CLEAR the DTCs. TEST the system for normal operation.
    2. NO  : INSTALL a new internal harness.
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