VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1271, C1272, C1275, C1276, C1413, C1414

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)
C1413 Front Speed Sensor RH Output Malfunction
C1414 Front Speed Sensor LH Output Malfunction

DESCRIPTION

Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control system.

The speed sensor rotors have 48 serrations. Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.

DTCs C1271, C1272, C1275 and C1276 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271, C1272, C1275 and C1276 are output only in Test Mode.

A01G6Z8E01

Tech Tips

Check the connection status between the sensor connector and the vehicle wire harness.

DTC No. DTC Detection Condition Trouble Area

C1413

C1414

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/LH

  • Speed sensor circuit

  • Sensor installation

  • Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH)

  • Skid control ECU (Brake actuator assembly)

C1271

C1272

 Detected only during Test Mode.

  • Front speed sensor RH/LH

  • Sensor installation

  • Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH)

C1275

C1276

 Detected only during Test Mode. Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH)

Tech Tips


  • DTC C1413 is for the front speed sensor RH.

  • DTC C1414 is for the front speed sensor LH.

WIRING DIAGRAM

A01G6WXE07

INSPECTION PROCEDURE

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 a DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      FL Speed Open Front speed sensor LH open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  2. READ VALUE USING GTS (FRONT SPEED SENSOR)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Select the Data List using the GTS 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 the speed value output from the speed sensor displayed on the GTS.

      Tech Tips

      Factors that affect the indicated vehicle speed include tire size, tire pressure, 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 similar to the speed indicated on the speedometer.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  3. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Start the engine.

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

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

      Result
      Result Proceed to
      DTCs C1413 and C1414 are not output. A
      DTCs C1413 and/or C1414 are output. B

      Tech Tips

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


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A01G9N5E26

      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

  5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR


    1. Remove the front speed sensor and the component with the sensor rotor Click here for speed sensor, Click here sensor rotor for 2AR-FE, and/or Click here sensor rotor for 2GR-FE).

    2. Check the speed sensor tip and speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the sensor tip and rotor.

      Note


      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

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


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

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


    1. Install the front speed sensor and the component with the sensor rotor.

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

    3. Disconnect the A40 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the A44 or A16 front speed sensor connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A40-7 (FR+) - A44-1 (FR+) Always Below 1 Ω
      A40-7 (FR+) - Body ground Always 10 kΩ or higher
      A40-6 (FR-) - A44-2 (FR-) Always Below 1 Ω
      A40-6 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A40-19 (FL+) - A16-1 (FL+) Always Below 1 Ω
      A40-19 (FL+) - Body ground Always 10 kΩ or higher
      A40-18 (FL-) - A16-2 (FL-) Always Below 1 Ω
      A40-18 (FL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    1. A01G7HEE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      Reconnect the A40 skid control ECU (brake actuator assembly) 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 Condition Specified Condition
      A44-1 (FR+) - Body ground Engine switch on (IG) 8 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      A16-1 (FL+) - Body ground Engine switch on (IG) 8 to 14 V

      Note

      Check the speed sensor signal after replacement Click here.

      Tech Tips

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


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    REPLACE FRONT SPEED SENSOR Click here