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Pinpoint Test C : Tr Sensor

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  1. Refer to Transmission Controls - 6R80 for schematic and connector information.

    Normal Operation and Fault Conditions 

    The TR sensor has a set of Hall-effect sensors that have a pattern of ON/OFF states which are dependent on the PARK, REVERSE, NEUTRAL, DRIVE, 3, 2 or 1 position of the manual valve. The TR sensor has digital sensor (hall effect) that converts the shifter position into a bit pattern, and a micro controller that converts the 4 bit signal into a 125 Hz pulse width modulated signal. The TR sensor also provides signals for the starting system and the reverse lights. The PCM uses the TR sensor signal as an input for its strategy for shifting and TCC operation. The PCM also uses the TR sensor signal for transmission fault detection and diagnostics. The TR sensor is integral to the leadframe. DTCs P0705, P0706, P0707, P0708, P0709, P1702, P1705 and P1921 cannot be set by an incorrectly adjusted selector lever cable.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0705:00 Transmission Range Sensor "A" Circuit (PRNDL Input): No Sub Type Information This DTC sets if the PCM detects an out of range condition due to a short to ground, a short to power or an open condition in the TR sensor circuitry.
    PCM P0706:00 Transmission Range Sensor "A" Circuit Range/Performance: No Sub Type Information This DTC indicates the TR sensor is reading out of range either high or low. This could be caused by a short to ground, a short to power or an open in the TR sensor circuit.
    PCM P0707:00 Transmission Range Sensor "A" Circuit Low: No Sub Type Information This DTC indicates the TR sensor is reading out of range low. This could be cause by a short to ground or an open in the TR sensor circuit.
    PCM P0708:00 Transmission Range Sensor "A" Circuit High: No Sub Type Information This DTC indicates the TR sensor is reading out of range high. This could be caused by a short to power in the TR sensor circuit.
    PCM P0709:00 Transmission Range Sensor "A" Circuit Intermittent: No Sub Type Information This DTC sets if the PCM detects an out of range condition due to a short to ground, a short to power or an open condition in the TR sensor circuitry.
    PCM P1702:00 Transmission Range Sensor Circuit Intermittent: No Sub Type Information This DTC illuminates the wrench light in conjunction with P0705, P0706, P0707, P0708 and/or P0709. Resolve the more specific DTC first.
    PCM P1705:00 Transmission Range Circuit Not Indicating Park/Neutral During Self Test: No Sub Type Information This DTC sets if the self-test is run in R or a forward gear, the TR sensor is misaligned or the TR sensor is inoperative.
    PCM P1921:00 Transmission Range Signal: No Sub Type Information This DTC sets in conjunction with P0706, P0707 and/or P0708 and indicates the fault was detected when the PCM was powered on but the engine was not running. This will prevent the engine from starting.

    Possible Sources 

    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • TR sensor
    • Transmission internal wiring harness molded leadframe
    • PCM

  2. C1 VERIFY DTCS

    NOTE: Read and record all DTCs.

    • Ignition OFF.

    • Select PARK.

    • Connect the diagnostic tool.

    • Carry out the KOEO then the KOER test.

    Are TR sensor DTCs present? 

    Yes  GO to  C2
    No  If no DTCs are present, diagnose any symptoms that may be present. REFER to: Diagnosis By Symptom .

  3. C2 CHECK TR SENSOR ELECTRICAL OPERATION

    • Ignition ON.

    • Enter the following diagnostic mode on the scan tool: TRPID: TR_DC and TR_FREQ.

    • Move the selector lever into each range and stop.

    • Observe the PIDs: TR_DC and TR_FREQ while wiggling the harness or driving the vehicle.

    • Compare the PID TR_DC to the selector lever position duty cycle, using the following chart.
      Selector Lever Position Range (% Duty Cycle)
      P 8.0 -- 25.8
      R 30.50 -- 39.31
      N 40.54 -- 52.49
      D 54.35 -- 71.15

    Is the TR_FREQ between 100 to 150 Hz, is TR_DC within range, and do both remain steady as the harness is wiggled or the vehicle is driven? 

    Yes  The problem is not in the TR sensor system. If any symptoms are present, REFER to: Diagnosis By Symptom .
    No  GO to  C3

  4. C3 CHECK THE TR SENSOR VPWR CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Disconnect: Transmission Vehicle Harness C1575.

    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-12
      GFD463463Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  C4
    No  GO to  C5

  5. C4 CHECK THE TR SENSOR SIGNAL CIRCUIT FOR VOLTAGE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-4
      GFD463463Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is voltage present? 

    Yes  GO to  C7
    No  GO to  C5

  6. C5 CHECK THE TR SENSOR VPWR AND SIGNAL CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1551T.

    Are the resistances less than 3 ohms? 

    Yes  GO to  C6
    No  REPAIR the circuit.

  7. C6 CHECK THE TR SENSOR VPWR AND SIGNAL CIRCUITS FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-12
      GFD463464Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1575-4
      GFD463464Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  Refer to PCM Guided Routine Testing . After installing a new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .
    No  REPAIR the circuit.

  8. C7 CHECK THE TR SENSOR GROUND CIRCUIT

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-12
      GFD463463Courtesy of FORD MOTOR COMPANY
      		 C1575-11

    Is the voltage greater than 11 volts? 

    Yes  GO to  C9
    No  GO to  C8

  9. C8 CHECK THE TR SENSOR GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1551T.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-11
      GFD463464Courtesy of FORD MOTOR COMPANY
      		 C1551T-7

    Is the resistance less than 3 ohms? 

    Yes  Refer to PCM Guided Routine Testing . After installing a new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .
    No  REPAIR the circuit.

  10. C9 CHECK THE TR SENSOR TO MANUAL VALVE CONNECTION

    • Check the connection between the TR sensor and the manual control valve. REFER to: Shift Solenoids (SS) .

    Is the TR sensor connected to the manual control valve shaft? 

    Yes  INSTALL a new TR sensor. REFER to: Shift Solenoids (SS) .
    No  CONNECT the TR sensor to the manual control valve, REFER to: Shift Solenoids (SS) . CLEAN any debris from the molded leadframe. RUN the KOEO self-test. If DTCs return, INSTALL a new TR sensor.
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