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Home >> Ford >> 2021 >> Bronco Wildtrak, 4D Utility >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Manual Transmission - 7-Speed Manual Transmission - Mt88) >> Diagnosis And Testing >> Manual Transmission >> Pinpoint Tests >> Pinpoint Test B: Gear Shift Position Sensor Signal Mismatch Faults

Pinpoint Test B: Gear Shift Position Sensor Signal Mismatch Faults

WARNING: This page is about a different variant/trim than selected.
  1. NOTE: The neutral position sensor is also known as the rev matching / selected gear / gear shift position sensor.

    Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.

    Normal Operation and Fault Conditions 

    The transmission neutral position sensor is bolted to the transmission housing and detects the position of a magnet mounted on the gear selector shaft. The neutral position sensor provides 3 PWM (pulse width modulation) output signals. The TRS_NEU_VAL_RAW and TR_NEU2_RAW signals both indicate the gear selector shaft axial position and if the selected gear is odd, even, or neutral. The two separate signals provide redundancy to ensure safe detection of the gear engagement status. The GEAR_SHIFT_C_DC signal indicates shaft rotation and which shift fork is selected. The PCM interprets these signals to determine the selected gear. The PCMPID GEARPOS_MAN indicates the selected gear as NEUTRAL, 1, 2, 3, 4, 5, 6, REVERSE, or UNDEFINED for crawler gear. The PCM also uses these signals to calculate the gear shift position states: Neutral, not in Neutral, odd gear, or even gear.

    As a rationality check, the PCM compares the selected gear detected to the estimated gear shift position using several inputs including:

    • Engine speed (RPM)
    • Clutch pedal position (CPP_STATUS)
    • Vehicle speed (VSS as reported by the ABS module)
    • Engine torque (TORQUE)

    The sensor data is used for several vehicle features and functions including rev matching, reverse camera activation, gear display on the instrument cluster, reverse parking aid, BLIS, hill start assist, and reverse lamps. If a mismatch exists between the estimated gear shift position state and the reported selected gear from the neutral position sensor, the PCM will set the GEARPOS_MAN to a degraded or faulted state. Vehicle features that require a gear signal for proper operation may not function properly when GEARPOS_MAN is in a degraded or faulted state.

    To achieve the required accuracy for the safe operation of these features the sensors need to be programmed to the characteristics of each individual magnet on the gear selector shaft. Once programmed, it is not possible to reprogram or otherwise adjust a sensor. The sensor and magnet matched pair are supplied as part of the selector shaft repair kit (-7K423-) and must always be installed together. To replace the sensor and magnet pair, REFER to: Gear Shift Position Sensor 

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U0401:00 Invalid Data Received from ECM/PCM A: No Sub Type Information This CMDTC sets when the ABS module receives invalid or out of range network data from the PCM.
    PAM U0401:00 Invalid Data Received from ECM/PCM A: No Sub Type Information This CMDTC sets when the PAM receives invalid network data from the PCM with a faulted signal data input.
    PCM P086A:00 Neutral Position Sensor "A" Circuit/Open: No Sub Type Information The DTC sets when there are 3 or more inferred neutral mismatch events during a drive cycle. Gear shift position sensor "A" reported the shift lever in the odd or even range. Engine speed, vehicle speed, and clutch pedal information indicated the vehicle was NOT moving with the engine running and the clutch pedal released. The PCM estimated the transmission was in neutral.
    TRS_NEU_VAL_RAW less than 30% or greater than 70%
    RPM at idle or above
    VSS mph (km/h)
    CPP_STATUS released
    PCM P086E:00 Neutral Position Sensor "A" Circuit Intermittent/Erratic: No Sub Type Information This DTC sets when there are 3 or more gear mismatch events during a drive cycle. Gear Shift Position Sensor "A" reports the shift lever is NOT in the even range position, however engine speed, vehicle speed, engine torque and clutch pedal information indicate the vehicle is moving and the transmission has an estimated gear ratio of an even gear. Alternatively, Gear shift position sensor "A" reports the shift lever is NOT in the odd range position, however engine speed, vehicle speed, engine torque and clutch pedal information indicates the vehicle is moving and the transmission has an estimated gear ratio of an odd gear.
    PCM P095B:00 Gear Shift Position Circuit "C" Range/Performance: No Sub Type Information This DTC sets when the selected gear indicated by the gear shift position sensor and the transmission gear ratio do not match. Transmission gear ratio is calculated by dividing engine speed by vehicle speed when the clutch pedal is released and the engine is producing sufficient torque.

    Possible Sources 

    • Clutch pedal binding or sticking
    • Clutch pedal position sensor fault
    • Worn, damaged, or slipping clutch
    • Wheel speed sensor faults
    • Engine performance faults
    • Gear shift position sensor
    • PCM

  2. B1 CHECK CLUTCH PEDAL FOR BINDING

    • Ignition OFF.

    • Slowly apply and release the clutch pedal

    Does the pedal move smoothly without binding or sticking? 

    Yes  GO to  B2
    No  REPAIR as necessary.

  3. B2 CHECK CLUTCH PEDAL POSITION SENSOR

    • Access and monitor CPP_STATUS

    • Slowly apply and release the clutch pedal

    Does CPP_STATUS indicate released when the pedal is fully released and not released within 1 in (25 mm)? 

    Yes  GO to  B3
    No  DIAGNOSE and REPAIR the clutch pedal position system. If any diagnostic trouble codes (DTCs) related to the clutch pedal position switch are present, REFER to the appropriate DTC Index.

  4. B3 CHECK CLUTCH

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal.

    • Position the gear shift lever in fourth gear.

    • Increase engine speed to 2000 RPM.

    • Slowly release the clutch pedal.

    Did the engine stall? 

    Yes  GO to  B4
    No  INSTALL a new clutch disc and pressure plate. REFER to: Clutch Disc and Pressure Plate

  5. B4 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR WHEEL SPEED SENSOR FAULTS

    • Enter the following diagnostic mode: ABS On Demand and CMDTC self-test.

    Are any wheel speed sensor DTC present? 

    Yes  DIAGNOSE and REPAIR all wheel speed sensor related faults. REFER to: Anti-Lock Brake System (ABS) and Stability Control
    No  GO to  B5

  6. B5 CHECK THE PCM (POWERTRAIN CONTROL MODULE) FOR FAULTS THAT AFFECT CALCULATED TORQUE

    • Enter the following diagnostic mode: PCMKOER and CMDTC self-test.

    Are any engine performance DTC present? 

    Yes  DIAGNOSE and REPAIR all engine performance related faults.
    No  GO to  B6

  7. B6 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN NEUTRAL

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in Neutral. Remove hand from gear shift lever

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 45.77 % 54.23 %
      TR_NEU2_RAW 36.85 % 43.15 %
      GEAR_SHIFT_C_DC 55.01 % 64.99 %
      TR_NPS_FRQ_A 225 Hz 275 Hz
      TR_NPS_FRQ_B
      GEAR_SHIFT_C_FRQ

    Are all of the PID values within the limits? 

    Yes  GO to  B7
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  8. B7 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN FIRST GEAR

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in first gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 73.97 % 86.03 %
      TR_NEU2_RAW 58.00 % 67.00 %
      GEAR_SHIFT_C_DC 35.01 % 44.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B8
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  9. B8 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN SECOND GEAR

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in second gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 13.97 % 26.03 %
      TR_NEU2_RAW 13.00 % 22.00 %
      GEAR_SHIFT_C_DC 35.01 % 44.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B9
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  10. B9 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN THIRD GEAR

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in third gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 73.97 % 86.03 %
      TR_NEU2_RAW 58.00 % 67.00 %
      GEAR_SHIFT_C_DC 55.01 % 64.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B10
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  11. B10 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN FOURTH GEAR

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in fourth gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 13.97 % 26.03 %
      TR_NEU2_RAW 13.00 % 22.00 %
      GEAR_SHIFT_C_DC 55.01 % 64.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B11
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  12. B11 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN FIFTH GEAR

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in fifth gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 73.97 % 86.03 %
      TR_NEU2_RAW 58.00 % 67.00 %
      GEAR_SHIFT_C_DC 75.01 % 84.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B12
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  13. B12 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN SIXTH GEAR

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in sixth gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 13.97 % 26.03 %
      TR_NEU2_RAW 13.00 % 22.00 %
      GEAR_SHIFT_C_DC 75.01 % 84.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B13
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  14. B13 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN REVERSE

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in reverse gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 73.97 % 86.03 %
      TR_NEU2_RAW 58.00 % 67.00 %
      GEAR_SHIFT_C_DC 15.01 % 24.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B14
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  15. B14 CHECK THE GEAR SHIFT POSITION SENSOR FOR CORRECT OPERATION IN CRAWLER

    • Start engine and allow to idle.

    • Engage parking brake.

    • Press and hold the clutch pedal for the duration of this test.

    • Position the gear shift lever in crawler gear. Remove hand from gear shift lever.

    • Access the PCM and monitor the gear shift position sensor data.
      PID Lower Limit Upper Limit
      TRS_NEU_VAL_RAW 13.97 % 26.03 %
      TR_NEU2_RAW 13.00 % 22.00 %
      GEAR_SHIFT_C_DC 15.01 % 24.99 %

    Are all of the PID values within the limits? 

    Yes  GO to  B15
    No  Install a new shift shaft and gear shift position sensor as a matched pair. REFER to: Gear Shift Position Sensor 

  16. B15 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the PCM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the PCM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to PCM GUIDED ROUTINE TESTING
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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