ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1413, C1275, C1276, C1414

DTC Code DTC Name
C1413 Front Speed Sensor RH Output Malfunction
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)
C1414 Front Speed Sensor LH Output Malfunction

DESCRIPTION

Refer to DTCs C1401 and C1402 Click here.

DTC Code DTC Detection Condition Trouble Area

C1413

C1414

One of the following conditions is met:


  1. An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.

  2. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds.

  3. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.

  • Front speed sensor RH/LH

  • Front skid control sensor wire RH/LH

  • Speed sensor circuit

  • Front speed sensor rotor RH/LH

  • Brake actuator assembly (Skid control ECU)

C1275

C1276

 Stored only during test mode.

  • Front speed sensor RH/LH

  • Front speed sensor rotor RH/LH

Tech Tips


  • DTC C1413 is for the front speed sensor RH.

  • DTC C1414 is for the front speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1405 and C1406 Click here.

INSPECTION PROCEDURE

Note


  • When replacing the brake actuator assembly, perform calibration Click here.

  • Check the speed sensor signal after replacement 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 Front speed sensor RH open circuit detection/ Error or Normal Normal -
      FL Speed Open Front speed sensor LH open circuit detection/ Error or Normal Normal -
      OK
      Normal (there are no momentary interruptions).

      Tech Tips

      Perform the above inspection before removing the sensor and disconnecting the connector.


    NG

    Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (FR/FL WHEEL SPEED)


    1. Turn the ignition switch off

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the intelligent tester 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 speed sensor RH value/ 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 speed sensor LH value/ 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 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, refer to 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).

    NG

    Click here

    OK

  3. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the signal check in the test mode procedure Click here.

      OK
      All test mode DTC are cleared.

    NG

    Click here

    OK

  4. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  5. CHECK FRONT SPEED SENSOR INSTALLATION


    1. Turn the ignition switch off.

    2. A00O4Y5E49
      Text in Illustration
      *1 Front Speed Sensor
      *a No clearance
      *b OK
      *c NG

      Check the speed sensor installation Click here.

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation bolt is tightened properly.

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  6. 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.


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK

  7. CHECK FRONT SPEED SENSOR ROTOR


    1. Remove the front axle with ABS rotor bearing assembly Click here.

    2. Check the speed sensor rotor.

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

      Tech Tips

      The front speed sensor rotor is incorporated into the front axle with ABS rotor bearing assembly.

      If the front speed sensor rotor needs to be replaced, replace it together with the front axle with ABS rotor bearing assembly.


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR

    OK

  8. INSPECT SKID CONTROL SENSOR WIRE


    1. Turn the ignition switch off.

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

    3. Remove the skid control sensor wire Click here.

    4. A00O4R3E06
      Text in Illustration
      *A for RH
      *B for LH
      *1 Skid Control Sensor Wire

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      Ap1-1 - p1-1 (FR-) Always Below 1 Ω
      Ap1-2 - p1-2 (FR+) Always Below 1 Ω
      Ap1-1 - Ap1-2 Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      Ap2-1 - p2-1 (FL-) Always Below 1 Ω
      Ap2-2 - p2-2 (FL+) Always Below 1 Ω
      Ap2-1 - Ap2-2 Always 10 kΩ or higher

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

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


    1. Install the skid control sensor wire.

    2. Disconnect the A6 skid control ECU connector.

    3. Disconnect the p1 and/or p2 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
      A6-7 (FR+) - p1-2 (FR+) Always Below 1 Ω
      A6-7 (FR+) - Body ground Always 10 kΩ or higher
      A6-6 (FR-) - p1-1 (FR-) Always Below 1 Ω
      A6-6 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A6-19 (FL+) - p2-2 (FL+) Always Below 1 Ω
      A6-19 (FL+) - Body ground Always 10 kΩ or higher
      A6-18 (FL-) - p2-1 (FL-) Always Below 1 Ω
      A6-18 (FL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK TERMINAL VOLTAGE (FR+, FL+)


    1. Connect the A6 skid control ECU connector.

    2. Disconnect the p1 and/or p2 speed sensor connector.

    3. A00O564E07
      Text in Illustration
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

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

      Standard Voltage
      for RH
      Tester Connection Switch Condition Specified Condition
      p1-2 (FR+) - Body ground Ignition switch ON 8 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      p2-2 (FL+) - Body ground Ignition switch ON 8 to 14 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    Ok

  11. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  12. REPLACE FRONT SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the front speed sensor Click here.


    NEXT

  13. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    REPLACE FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY Click here

    A

    END