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

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU.

A017G51E01
DTC Code DTC Detection Condition Trouble Area

C1403

C1404

Any of the following is detected:


  1. At a vehicle speed 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 (for 2WD) or for 30 seconds or more (for 4WD).

  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 a cumulative time of 200 seconds.

  • Rear speed sensor RH/LH

  • Speed sensor rotor

Tech Tips


  • DTC C1403 is for the rear speed sensor RH.

  • DTC C1404 is for the rear speed sensor LH.

WIRING DIAGRAM

A017D9RE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. A017C9VE06

      Check the speed sensor installation (for 2WD).

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

    2. Check the speed sensor installation (for 4WD).

      OK
      There is no clearance between the sensor and the rear axle carrier.
      The installation nut is tightened properly.
      Torque
      8.5 N*m (87 kgf*cm, 75 in.*lbf)
      Result
      Result Proceed to
      OK (for 4WD) A
      OK (for 2WD) B
      NG (for 2WD) C
      NG (for 4WD) D

    B

    READ VALUE ON INTELLIGENT TESTER (REAR SPEED SENSOR) Click here

    C

    INSTALL REAR SPEED SENSOR CORRECTLY (for 2WD) Click here

    D

    INSTALL REAR SPEED SENSOR CORRECTLY (for 4WD) Click here

    A

  2. CHECK REAR SPEED SENSOR TIP


    1. Remove the rear speed sensor Click here.

    2. Check the speed sensor tip.

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

      Note

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


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  3. CHECK REAR SPEED SENSOR ROTOR


    1. Remove the rear speed sensor rotor 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

      If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive shaft assembly.


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR ROTOR

    OK

  4. READ VALUE ON INTELLIGENT TESTER (REAR SPEED SENSOR)


    1. Install the rear speed sensor and the rear speed sensor rotor.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Select the Data List mode on the intelligent tester Click here.

      ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Speed RR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
      RL Wheel Speed RL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer

    5. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester 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 intelligent tester is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
      Result
      Result Proceed to
      NG (for 4WD) A
      NG (for 2WD) B
      OK C

      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 it together with the rear axle hub and bearing assembly with rear speed sensor.

      • 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.


    B

    REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

    C

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    A

  5. REPLACE REAR SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  6. RECONFIRM DTC


    1. Clear the DTCs Click here.

    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.

      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


      • If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive shaft 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.


    B

    REPLACE REAR SPEED SENSOR ROTOR

    A

    END