VEHICLE STABILITY CONTROL 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.

Click here

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 speed sensor rotor RH (Front axle hub sub-assembly RH)
C1276 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) Detected only during Test Mode.

  • Front speed sensor LH

  • Front speed sensor rotor LH (Front axle hub sub-assembly LH)
C1413 Front Speed Sensor RH Output Malfunction

Any 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 speed sensor circuit

  • Front speed sensor rotor RH (Front axle hub sub-assembly RH)

  • Skid control ECU (Brake actuator assembly)
C1414 Front Speed Sensor LH Output Malfunction

Any 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 speed sensor circuit

  • Front speed sensor rotor LH (Front axle hub sub-assembly LH)

  • Skid control ECU (Brake actuator assembly)

Tech Tips


  • DTC C1413 and C1275 are for the front speed sensor RH.

  • DTC C1414 and C1276 are for the front speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1271, C1272, C1401 and C1402.

Click here

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

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


      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
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 8 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

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  3. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

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

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      All Test Mode DTCs are cleared.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 5 Click here

    OK

  4. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    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 recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      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
      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

    GO TO STEP 11 Click here

  5. CHECK FRONT SPEED SENSOR INSTALLATION


    1. Turn the ignition switch off.

    2. A01KC8UC15
      *a Normal
      *b Abnormal
      *c Clearance

      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.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  6. INSPECT 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.

      • 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
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK

  7. INSPECT FRONT SPEED SENSOR ROTOR


    1. Remove the front axle hub sub-assembly.

      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


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

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

    3. Reinstall the front speed sensor and the front axle hub sub-assembly.

      Click here for the front speed sensor

      Click here the front axle hub sub-assembly

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR 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 A64 skid control ECU (brake actuator assembly) connector and the A14 and/or A43 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
      A64-7 (FR+) - A43-1 (FR+) Always Below 1 Ω
      A64-6 (FR-) - A43-2 (FR-) Always Below 1 Ω
      A64-7 (FR+) or A43-1(FR+) - Body ground Always 10 kΩ or higher
      A64-6 (FR-) or A43-2 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A64-19 (FL+) - A14-1 (FL+) Always Below 1 Ω
      A64-18 (FL-) - A14-2 (FL-) Always Below 1 Ω
      A64-19 (FL+) or A14-1 (FL+) - Body ground Always 10 kΩ or higher
      A64-18 (FL-) or A14-2 (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 INPUT)


    1. Reconnect the A64 skid control ECU (brake actuator assembly) connector.

    2. A01KD17C01
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      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
      A43-1 (FR+) - Body ground Ignition switch ON 8 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A14-1 (FL+) - Body ground Ignition switch ON 8 to 14 V

      Note

      Check the speed sensor signal after replacement.

      Click here

      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

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  10. RECONFIRM DTC


    1. Reconnect the A14 and/or A43 front speed sensor connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Start the engine.

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

    5. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      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
      DTCs C1413 and/or C1414 are output
      DTCs C1413 and C1414 are not output

    DTCs C1413 and C1414 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTCs C1413 and/or C1414 are output

  11. 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

      Result
      Proceed to
      NEXT

    NEXT

  12. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    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 recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      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
      DTCs C1413 and C1414 are not output
      DTCs C1413 and/or C1414 are output

    DTCs C1413 and C1414 are not output

    END

    DTCs C1413 and/or C1414 are output

  13. REPLACE FRONT AXLE HUB SUB-ASSEMBLY


    1. Turn the ignition switch off.

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

      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.

      • 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
      NEXT

    NEXT

  14. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    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 recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      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
      DTCs C1413 and C1414 are not output
      DTCs C1413 and/or C1414 are output

    DTCs C1413 and C1414 are not output

    END

    DTCs C1413 and/or C1414 are output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here