VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1401, C1402

DTC Code DTC Name
C1401 Front Speed Sensor RH Malfunction
C1402 Front Speed Sensor LH Malfunction

DESCRIPTION

Refer to DTCs C1413 and C1414.

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DTC No. Detection Item DTC Detection Condition Trouble Area
C1401 Front Speed Sensor RH Malfunction

Any of the following is detected:


  1. At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.

  2. At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.

  3. At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more.

  • Sensor installation

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

  • Front speed sensor rotor RH (front axle hub sub-assembly RH)
C1402 Front Speed Sensor LH Malfunction

Any of the following is detected:


  1. At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.

  2. At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.

  3. At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more.

  • Sensor installation

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

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

Tech Tips

Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed:


  1. Drive the vehicle at 30 km/h (19 mph) for 30 seconds or more and check that the ABS warning light goes off.

  2. Clear the DTCs.

Tech Tips


  • DTC C1401 is for the front speed sensor RH.

  • DTC C1402 is for the front speed sensor LH.

PROCEDURE


  1. CHECK FRONT SPEED SENSOR INSTALLATION


    1. B003TUEC08
      *1 Front Speed Sensor
      *a Correct
      *b Incorrect
      *c No clearance

      Check the speed sensor installation.

      OK
      There is no clearance between the sensor and the front steering knuckle.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  2. READ VALUE USING GTS (FRONT SPEED SENSOR)


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

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Select the Data List using the GTS.

      Click here


      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 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

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

    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.
      Result
      Proceed to
      OK
      NG

      Tech Tips


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

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

      • 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.


    OK

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

    NG

    USE SIMULATION METHOD TO CHECK Click here