VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1403, C1404

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

DESCRIPTION

Each speed sensor detects the 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 rows of alternating N and S magnetic poles. 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.

A01W3J1E02

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area

C1403

C1404

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 less than 10 km/h (6 mph), outputs from both rear speed sensors are 0 km/h (0 mph) for 15 seconds or more.

  • Rear speed sensor RH/LH

  • Sensor installation

  • Rear speed sensor rotor RH/LH (rear axle hub and bearing assembly RH/LH)

Tech Tips


  • DTC C1403 is for the rear speed sensor RH.

  • DTC C1404 is for the rear speed sensor LH.

WIRING DIAGRAM

A01W1QXE32

PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. A01W3LCE03
      Text in Illustration
      *1 Rear Speed Sensor
      *a Correct
      *b Incorrect
      *c No clearance

      Check the speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle carrier.

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  2. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List using the GTS Click here.

      ABS/VSC/TRC
      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 km/h (202 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 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

    4. 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.

      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 with rear 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 Click here.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY WITH REAR SPEED SENSOR Click here