VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1403, C1273, C1274, C1404

DTC Code DTC Name
C1403 Rear Speed Sensor RH Malfunction
C1273 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1274 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1404 Rear Speed Sensor LH Malfunction

DESCRIPTION

Refer to DTCs C1401 and C1402 Click here.

DTC Code DTC Detection Condition Trouble Area

C1403

C1404

One of the following conditions is met:


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

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

  3. At a vehicle speed of less than 10 km/h (6 mph), the outputs from both rear speed sensors are 0 km/h (0 mph) for a cumulative time of 200 seconds.

  • Rear speed sensor RH/LH

  • Rear skid control rotor RH/LH

  • Sensor installation

C1273

C1274

 Stored during Test Mode.

  • Rear speed sensor RH/LH

  • Rear skid control rotor RH/LH

  • Sensor installation

Tech Tips


  • DTCs C1403 and C1273 are for the rear speed sensor RH.

  • DTCs C1404 and C1274 are for the rear speed sensor LH.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. Turn the ignition switch off.

    2. A01E1N8E11
      Text in Illustration
      *1 Rear Speed Sensor
      *a No clearance
      *b CORRECT
      *c INCORRECT

      Check the speed sensor installation Click here.

      OK
      The installation bolt is tightened properly.
      There is no clearance between the sensor and rear axle housing.

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY

    OK

  2. INSPECT REAR SPEED SENSOR TIP


    1. Turn the ignition switch off.

    2. Remove the rear speed sensor Click here.

    3. Check the speed sensor tip.

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

      Note

      Do not replace the speed sensor if no damage to the speed sensor tip is found.

      Tech Tips


      • If the sensor is contaminated with oil or other foreign material, clean the sensor.

      • If there is iron powder sticking to the rotor, this will result in a malfunction. Therefore, confirm that the rotor is not contaminated with foreign material before replacing the sensor.


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  3. INSPECT REAR SKID CONTROL ROTOR


    1. Turn the ignition switch off.

    2. Remove the rear axle shaft with backing plate Click here.

    3. Check the rear skid control rotor.

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

    NG

    CLEAN OR REPLACE REAR SKID CONTROL ROTOR

    OK

  4. READ VALUE USING INTELLIGENT TESTER (RR/RL WHEEL SPEED)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List, and then drive the vehicle.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear speed sensor RH reading / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Actual wheel speed No large fluctuations when driving at a constant speed.
      RL Wheel Speed Rear speed sensor LH reading / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Actual wheel speed No large fluctuations when driving at a constant speed.

    6. Check the speed value output from the speed sensor displayed on the intelligent tester.

      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, refer to 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).

    NG

    REPLACE REAR SPEED SENSOR Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  5. REPLACE REAR SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor Click here.


    NEXT

  6. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition 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.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    REPLACE REAR SKID CONTROL ROTOR Click here

    A

    END