VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1271, C1272, C1275, C1276

DTC Code DTC Name
C1271 Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1272 Low Output Signal of Front Speed Sensor LH (Test Mode DTC)
C1275 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1276 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DESCRIPTION

DTCs C1271 to C1276 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs from C1271 to C1276 are output only in Test Mode.

DTC Code DTC Detection Condition Trouble Area

C1271

C1272

 Detected only during Test Mode.

  • Front speed sensor

  • Sensor installation

  • Speed sensor rotor

C1275

C1276

 Detected only during Test Mode. Speed sensor rotor

Tech Tips


  • DTCs C1271 and C1275 are for the front speed sensor RH.

  • DTCs C1272 and C1276 are for the front speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1401 and C1402 Click here.

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to the DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection / Error or Normal Normal -
      FL Speed Open Front speed sensor LH open detection / Error or Normal Normal -
      Result
      Result Proceed to
      There are momentary interruptions A
      There are no momentary interruptions B
      There is a constant open circuit C

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    B

    Click here

    C

    Click here

    A

  2. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)


    1. Turn the engine switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruption between the skid control ECU (brake actuator assembly) and the front speed sensor Click here.

    4. Check that there are no momentary interruptions.


    NEXT

  3. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the engine switch off.

    2. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are cleared.

    NG

    Click here

    OK

    END

  4. READ VALUE USING GTS (FR/FL WHEEL SPEED)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed No large fluctuations when driving at a constant speed.
      FL Wheel Speed Front wheel speed sensor LH reading /min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed No large fluctuations when driving at a constant speed.

    6. Check the speed value output from the speed sensor displayed on the GTS.

      Tech Tips

      Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Click here.

      OK
      The speed value output from the speed sensor displayed on the GTS is the similar speed as indicated on the speedometer.

    NG

    Click here

    OK

  5. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the engine switch off.

    2. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are cleared.

    NG

    Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  6. CHECK FRONT SPEED SENSOR INSTALLATION

    A01FISPE03
    Text in Illustration
    *A for 2WD
    *B for AWD
    *a No Clearance
    *b OK
    *c NG

    1. Check the speed sensor installation (for 2WD).

      OK
      There is no clearance between the sensor and the front axle hub.

    2. Check the speed sensor installation (for AWD).

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation bolt is tightened properly.
      Result
      Result Proceed to
      OK (for AWD) A
      OK (for 2WD) B
      NG (for 2WD) C
      NG (for AWD) D

    B

    Click here

    C

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

    D

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    A

  7. CHECK FRONT SPEED SENSOR TIP


    1. Remove the front speed sensor Click here.

    2. Check the speed sensor tip.

      OK
      No scratches, oil, or foreign matter on the sensor tip.

      Note


      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

      • Check the speed sensor signal after cleaning or replacement Click here.


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK

  8. CHECK FRONT SPEED SENSOR ROTOR


    1. Remove the front axle hub sub-assembly (front speed sensor rotor) Click here.

    2. Check the speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the rotors.
      Result
      Result Proceed to
      Scratches, oil, or foreign matter on the rotors A
      No scratches, oil, or foreign matter on the rotors B

      Note

      Check the speed sensor signal after cleaning or replacement Click here.

      Tech Tips

      The front speed sensor rotor is incorporated into the front axle hub sub-assembly.

      If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.


    B

    Click here

    A

    CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)


    1. A01FF60E05
      Text in Illustration
      *A for RH
      *B for LH
      *1 Skid Control Sensor Wire

      Turn the engine switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Remove the skid control sensor wire Click here.

    4. Check the connector case and terminals for deformation and corrosion.

      Standard condition
      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH:
      Tester Connection Condition Specified Condition
      Ao1-2 - o1-2 (FR+) Always Below 1 Ω
      Ao1-1 - o1-1 (FR-) Always Below 1 Ω
      Ao1-1 - Ao1-2 Always 10 kΩ or higher
      for LH:
      Tester Connection Condition Specified Condition
      oA2-1 - o2-2 (FL+) Always Below 1 Ω
      oA2-2 - o2-1 (FL-) Always Below 1 Ω
      oA2-1 - oA2-2 Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)


    1. Turn the engine switch off.

    2. for 2WD:


      1. Install the skid control sensor wire Click here.

    3. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    4. Disconnect the A13 skid control ECU (brake actuator assembly) connector.

    5. for 2WD:


      1. Disconnect the o1 and/or o2 speed sensor connector.

    6. for AWD:


      1. Disconnect the A73 and/or A71 speed sensor connector.

    7. Check the connector case and terminals for deformation and corrosion.

      Standard condition
      No deformation or corrosion.

    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH (2WD):
      Tester Connection Condition Specified Condition
      A13-7 (FR+) - o1-2 (FR+) Always Below 1 Ω
      A13-7 (FR+) - Body ground Always 10 kΩ or higher
      A13-6 (FR-) - o1-1 (FR-) Always Below 1 Ω
      A13-6 (FR-) - Body ground Always 10 kΩ or higher
      for LH (2WD):
      Tester Connection Condition Specified Condition
      A13-19 (FL+) - o2-2 (FL+) Always Below 1 Ω
      A13-19 (FL+) - Body ground Always 10 kΩ or higher
      A13-18 (FL-) - o2-1 (FL-) Always Below 1 Ω
      A13-18 (FL-) - Body ground Always 10 kΩ or higher
      for RH (AWD):
      Tester Connection Condition Specified Condition
      A13-7 (FR+) - A73-2 (FR+) Always Below 1 Ω
      A13-7 (FR+) - Body ground Always 10 kΩ or higher
      A13-6 (FR-) - A73-1 (FR-) Always Below 1 Ω
      A13-6 (FR-) - Body ground Always 10 kΩ or higher
      for LH (AWD):
      Tester Connection Condition Specified Condition
      A13-19 (FL+) - A71-1 (FL+) Always Below 1 Ω
      A13-19 (FL+) - Body ground Always 10 kΩ or higher
      A13-18 (FL-) - A71-2 (FL-) Always Below 1 Ω
      A13-18 (FL-) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. Reconnect the skid control ECU (brake actuator assembly) connector.

    2. A01FH6JE26
      Text in Illustration
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      for 2WD:


      1. Disconnect the speed sensor connector.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        for RH
        Tester Connection Switch Condition Specified Condition
        o1-2 (FR+) - Body ground Engine switch on (IG) 8 to 14 V
        for LH
        Tester Connection Switch Condition Specified Condition
        o2-2 (FL+) - Body ground Engine switch on (IG) 8 to 14 V
    3. A01FE0SE02
      Text in Illustration
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      for AWD:


      1. Disconnect the speed sensor connector.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        for RH
        Tester Connection Switch Condition Specified Condition
        A73-2 (FR+) - Body ground Engine switch on (IG) 8 to 14 V
        for LH
        Tester Connection Switch Condition Specified Condition
        A71-1 (FL+) - Body ground Engine switch on (IG) 8 to 14 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  12. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the engine switch off.

    2. Reconnect the front speed sensor connector.

    3. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are cleared.
      Result
      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

    B

    REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR Click here

    C

    REPLACE FRONT SPEED SENSOR Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  13. REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Replace the front speed sensor and the front axle hub sub-assembly (front speed sensor rotor) Click here.

      Tech Tips

      The front speed sensor rotor is incorporated into the front axle hub sub-assembly.

      If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly with front speed sensor.


    NEXT

  14. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are cleared.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END

  15. REPLACE FRONT SPEED SENSOR


    1. Turn the engine switch off.

    2. Replace the front speed sensor Click here.


    NEXT

  16. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are cleared.

    NG

    REPLACE FRONT SPEED SENSOR ROTOR Click here

    OK

    END

  17. REPLACE FRONT SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Replace the front axle hub sub-assembly (front speed sensor rotor) Click here.

      Tech Tips

      The front speed sensor rotor is incorporated into the front axle hub sub-assembly.

      If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.


    NEXT

  18. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are cleared.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END