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 (brake actuator assembly). These signals are used for brake 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 (brake actuator assembly).

Tech Tips

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

B006O7IE22
DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1403 Rear Speed Sensor RH Malfunction

Either 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 speed sensors are 0 km/h (0 mph) for 15 seconds or more. (except when both rear speed sensors are 0 km/h (0 mph))

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

  • Sensor installation

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

 -
C1404 Rear Speed Sensor LH Malfunction

Either 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 speed sensors are 0 km/h (0 mph) for 15 seconds or more. (except when both rear speed sensors are 0 km/h (0 mph))

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

  • Sensor installation

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

 -

WIRING DIAGRAM

B006O70E01

CAUTION / NOTICE / HINT

Note

Disassembly of the speed sensor from the rear axle hub and bearing assembly is prohibited.

PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. B006QFYC07
      *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 the rear axle hub.

      Tech Tips

      Because the rear axle hub and bearing assembly cannot be disassembled, if the rear speed sensor needs replacement, replace the rear axle hub and bearing assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    OK

  2. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    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 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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Wheel Speed
      RL Wheel Speed

    5. Check that there is no difference between the speed value output from the speed sensor displayed on the GTS 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 GTS is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

      Note

      Check the speed sensor signal after replacement.

      Click here

      Tech Tips


      • The rear speed sensor and rear speed sensor rotor are 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

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here