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

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

DESCRIPTION

Refer to DTCs C1271, C1272, C1401 and C1402.

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DTC No. Detection Item DTC Detection Condition Trouble Area
C1275 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) Detected only during Test Mode.

  • Front speed sensor RH

  • Front skid control rotor RH (Front axle hub inner bearing RH)*1

  • Front skid control rotor RH*2
C1276 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) Detected only during Test Mode.

  • Front speed sensor LH

  • Front skid control rotor LH (Front axle hub inner bearing LH)*1

  • Front skid control rotor LH*2
C1413 Front Speed Sensor RH Output Malfunction

Either of the following is detected:


  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

  • Front skid control rotor RH (Front axle hub inner bearing RH)*1

  • Front skid control rotor RH*2

  • Sensor installation

  • Skid control ECU (Brake actuator assembly)

  • Wire harness or connector
C1414 Front Speed Sensor LH Output Malfunction

Either of the following is detected:


  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 LH

  • Front skid control rotor LH (Front axle hub inner bearing LH)*1

  • Front skid control rotor LH*2

  • Sensor installation

  • Skid control ECU (Brake actuator assembly)

  • Wire harness or connector

WIRING DIAGRAM

Refer to DTCs C1405 and C1406.

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CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform Test Mode (Signal Check) to acquire the rear differential lock identification information.

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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


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection Normal or Error Normal Error: Momentary interruption
      FL Speed Open Front speed sensor LH open detection Normal or Error Normal Error: Momentary interruption

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Speed Open
      FL Speed Open
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  2. READ VALUE USING GTS (FRONT SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

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

    5. According to the display on the GTS, read the Data List.


      Chassis > ABS/VSC/TRC > Data List
      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.: 326.4 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.: 326.4 km/h (202 mph)

      		 Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Wheel Speed
      FL Wheel Speed

    6. Check that there is no difference between the speed value output from the speed sensor displayed on the GTS 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 GTS is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 4 Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Perform a road test

    5. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Proceed to
      DTCs C1413 and C1414 are not output
      DTCs C1413 and/or C1414 are output

    DTCs C1413 and C1414 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTCs C1413 and/or C1414 are output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. CHECK FRONT SPEED SENSOR INSTALLATION


    1. Turn the ignition switch off.

    2. B0027EXC15
      *a Normal
      *b Abnormal
      *c Clearance

      Check the speed sensor installation.

      for 2WD other than Pre-Runner: Click here

      for 4WD and Pre-Runner: Click here

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

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY for 2WD other than Pre-Runner: Click here
    INSTALL FRONT SPEED SENSOR CORRECTLY for 4WD and Pre-Runner: Click here

    OK

  5. INSPECT FRONT SPEED SENSOR TIP


    1. Remove the front speed sensor.

      for 2WD other than Pre-Runner: Click here

      for 4WD and Pre-Runner: 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.

      • If there is iron powder sticking to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign material before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK (for 4WD and Pre-Runner)
      OK (for 2WD other than Pre-Runner)
      NG

    OK (for 2WD other than Pre-Runner)

    INSPECT FRONT SKID CONTROL ROTOR Click here

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK (for 4WD and Pre-Runner)

  6. INSPECT FRONT AXLE HUB INNER BEARING


    1. Remove the front axle hub inner bearing.

      Click here

    2. Check the front skid control 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


      • The front skid control rotor is incorporated into the front axle hub inner bearing.

      • If the skid control rotor needs to be replaced, replace it together with the front axle hub inner bearing.

    3. Reinstall the front speed sensor and the front axle hub inner bearing.

      for the front speed sensor: Click here

      for the front axle hub inner bearing: Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 8 Click here

    NG

    CLEAN OR REPLACE FRONT AXLE HUB INNER BEARING

  7. INSPECT FRONT SKID CONTROL ROTOR


    1. Remove the front skid control rotor.

      Click here

    2. Check the front skid control rotor.

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

      Note

      Check the speed sensor signal after cleaning or replacement.

      Click here

    3. Reinstall the front speed sensor and the front skid control rotor.

      for the front speed sensor: Click here

      for the front skid control rotor: Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SKID CONTROL ROTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)


    1. Turn the ignition switch off.

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

    3. Disconnect the A3 skid control ECU (brake actuator assembly) connector and the A8 and/or A9 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
      A3-7 (FR+) - A8-2 (FR+) Always Below 1 Ω
      A3-6 (FR-) - A8-1 (FR-) Always Below 1 Ω
      A3-7 (FR+) or A8-2 (FR+) - Body ground Always 10 kΩ or higher
      A3-6 (FR-) or A8-1 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A3-19 (FL+) - A9-2 (FL+) Always Below 1 Ω
      A3-18 (FL-) - A9-1 (FL-) Always Below 1 Ω
      A3-19 (FL+) or A9-2 (FL+) - Body ground Always 10 kΩ or higher
      A3-18 (FL-) or A9-1 (FL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR OUTPUT)


    1. B0027AAC12
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      Reconnect the A3 skid control ECU (brake actuator assembly) connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      for RH
      Tester Connection Switch Condition Specified Condition
      A8-2 (FR+) - Body ground Ignition switch ON 8 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A9-2 (FL+) - Body ground Ignition switch ON 8 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT SPEED SENSOR for 2WD other than Pre-Runner: Click here
    REPLACE FRONT SPEED SENSOR for 4WD and Pre-Runner: Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here