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 deleted 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 RH/LH

  • 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 Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, 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 FR speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      FL Speed Open FL speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      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

    READ VALUE ON INTELLIGENT TESTER (FRONT SPEED SENSOR) Click here

    C

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    A

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


    1. Turn the ignition switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruption between the skid control ECU 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 ignition switch off.

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

      OK
      All Test Mode DTCs are erased.

    NG

    READ VALUE ON INTELLIGENT TESTER (FRONT SPEED SENSOR) Click here

    OK

    END

  4. READ VALUE ON INTELLIGENT TESTER (FRONT SPEED SENSOR)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Select the Data List mode on the intelligent tester Click here.

      ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed FR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
      FL Wheel Speed FL wheel speed sensor reading /min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer

    5. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.

      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 intelligent tester is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
      ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Direction FR wheel direction / FORWARD or BACK

      FORWARD: Forward

      BACK: Back

      		 -
      FL Wheel Direction FL wheel direction / FORWARD or BACK

      FORWARD: Forward

      BACK: Back

      		 -

    6. Check that the sensor signal conforms to the wheel direction.

      OK
      The wheel direction is displayed.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  5. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

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

      OK
      All Test Mode DTCs are erased.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  6. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A017E6ZE10

      Turn the ignition switch off.

    2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation nut is tightened properly.
      Torque
      8.0 N*m (82 kgf*cm, 71 in.*lbf)

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  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

      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 speed sensor rotor Click here.

    2. Check the speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the rotors.

      Note

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

      Tech Tips

      If the front speed sensor rotor needs to be replaced, replace it together with the front drive shaft assembly.


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR

    OK

  9. INSPECT FRONT SPEED SENSOR


    1. A017BQ7E01

      Install the front speed sensor and the front speed sensor rotor.

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

    3. Disconnect the front speed sensor connector.

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

      Standard resistance
      for RH
      Tester Connection Condition Specified Condition
      2 (FR+) - Body ground Always 10 kΩ or higher
      1 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      2 (FL+) - Body ground Always 10 kΩ or higher
      1 (FL-) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE FRONT SPEED SENSOR Click here

    OK

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


    1. A017ESEE08

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

    2. Disconnect the skid control ECU connector.

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

      Standard resistance
      for RH
      Tester Connection Condition Specified Condition
      A24-7 (FR+) - A25-2 (FR+) Always Below 1 Ω
      A24-7 (FR+) - Body ground Always 10 kΩ or higher
      A24-6 (FR-) - A25-1 (FR-) Always Below 1 Ω
      A24-6 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A24-19 (FL+) - A14-2 (FL+) Always Below 1 Ω
      A24-19 (FL+) - Body ground Always 10 kΩ or higher
      A24-18 (FL-) - A14-1 (FL-) Always Below 1 Ω
      A24-18 (FL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. A017BKWE14

      Reconnect the skid control ECU connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      for RH
      Tester Connection Switch Condition Specified Condition
      A25-2 (FR+) - Body ground Ignition switch on (IG) 8 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A14-2 (FL+) - Body ground Ignition switch on (IG) 8 to 14 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  12. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

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

      OK
      All Test Mode DTCs are erased.

    NG

    REPLACE FRONT SPEED SENSOR Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  13. REPLACE FRONT SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the front speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    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 erased.

    NG

    REPLACE FRONT SPEED SENSOR ROTOR Click here

    OK

    END

  15. REPLACE FRONT SPEED SENSOR ROTOR


    1. Turn the ignition switch off.

    2. Replace the front drive shaft assembly (front speed sensor rotor) Click here.

      Tech Tips

      If the front speed sensor rotor needs to be replaced, replace it together with the front drive shaft assembly.

      Note

      Check the speed sensor signal after replacement 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 erased.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END