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 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 and store system information 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 USING 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 engine 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 engine switch off.

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

      OK
      All Test Mode DTCs are cleared.

    NG

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

    OK

    END

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


    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

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

      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) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front wheel speed sensor LH reading / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

    5. Check that the speed value output from the speed sensor displayed on the intelligent tester.

      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 similar speed as indicated on the speedometer.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION 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

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  6. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A019MP4E26

      Turn the engine switch off.

    2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation bolt is tightened properly.
      Torque
      8.5 N*m (87 kgf*cm, 75 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 rotor.

      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 outboard joint shaft assembly.


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR

    OK

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


    1. A019MH2E18
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to Front Speed Sensor)

      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
      A44-7 (FR+) - A37-2 (FR+) Always Below 1 Ω
      A44-7 (FR+) - Body ground Always 10 kΩ or higher
      A44-6 (FR-) - A37-1 (FR-) Always Below 1 Ω
      A44-6 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A44-19 (FL+) - A36-2 (FL+) Always Below 1 Ω
      A44-19 (FL+) - Body ground Always 10 kΩ or higher
      A44-18 (FL-) - A36-1 (FL-) Always Below 1 Ω
      A44-18 (FL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. A019LSLE29
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Speed Sensor)

      Reconnect the skid control ECU connector.

    2. Turn the engine 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
      A37-2 (FR+) - Body ground Engine switch on (IG) 8 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A36-2 (FL+) - Body ground Engine switch on (IG) 8 to 14 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  11. 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

    REPLACE FRONT SPEED SENSOR Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  12. REPLACE FRONT SPEED SENSOR


    1. Turn the engine switch off.

    2. Replace the front speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  13. 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

  14. REPLACE FRONT SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Remove the front drive shaft assembly Click here for 2GR-FE, or Click here for 1AR-FE).

    3. Replace the front drive outboard joint shaft assembly (front speed sensor rotor) Click here for 2GR-FE, or Click here for 1AR-FE).

      Tech Tips

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

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  15. PERFORM TEST MODE (SIGNAL CHECK)


    1. Install the front drive shaft assembly.

    2. 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