VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1403, C1404

DTC Code DTC Name
C1403 Malfunction in Rear Speed Sensor RH Circuit
C1404 Malfunction in Rear Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1415 and C1416.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area
C1403 Malfunction in Rear Speed Sensor RH Circuit

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 speed sensors are 0 km/h (0 mph) for 15 seconds or more.

  • Rear speed sensor RH

  • Rear speed sensor RH installation

  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
C1404 Malfunction in Rear Speed Sensor LH Circuit

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 speed sensors are 0 km/h (0 mph) for 15 seconds or more.

  • Rear speed sensor LH

  • Rear speed sensor LH installation

  • Rear speed sensor rotor LH (rear axle hub and bearing 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 C1403 is for the rear speed sensor RH.

  • DTC C1404 is for the rear speed sensor LH.

PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. B007721C18
      *1 Rear Speed Sensor
      *a Correct
      *b Incorrect
      *c 8.5 Nm
      *d No clearance

      Check the speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle carrier.
      The installation bolt is tightened properly.
      Torque
      8.5 N*m (87 kgf*cm, 75 in.*lbf)
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  2. CHECK REAR SPEED SENSOR AND SENSOR ROTOR


    1. Remove the rear speed sensor and the component with the sensor rotor.

      for Speed Sensor: Click here

      for Sensor Rotor: Click here

    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

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  3. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Reinstall the rear speed sensor and the component with the sensor rotor.

      for Speed Sensor: Click here

      for Sensor Rotor: Click here

    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
      RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      RL Wheel Speed Rear wheel speed sensor LH reading Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Wheel Speed
      RL 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 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 similar to the speed indicated on the speedometer.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  4. REPLACE REAR SPEED SENSOR


    1. Turn the engine switch off.

    2. Replace the rear speed sensor.

      Click here

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine switch off.

    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 output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1403 and C1404 are not output. A
      DTCs C1403 and/or C1404 are output. B

      Note

      Check the speed sensor signal after replacement.

      Click here

      Tech Tips


      • The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

        If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing assembly.

      • 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


    A

    END

    B

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here