VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1403,C1273,C1274 and 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 No.

Detection Item

DTC Detection Condition

Trouble Area

C1273

Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)

Stored only during test mode.

  • Rear speed sensor RH

  • Speed sensor rotor RH

  • Sensor installation

C1274

Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)

Stored only during test mode.

  • Rear speed sensor LH

  • Speed sensor rotor LH

  • Sensor installation

C1403

Rear Speed Sensor RH Malfunction

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 less than that from 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 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

  • Speed sensor rotor RH

  • Sensor installation

C1404

Rear Speed Sensor LH Malfunction

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 less than that from 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 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 LH

  • Speed sensor rotor LH

  • Sensor installation
Tip:

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

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

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK REAR SPEED SENSOR INSTALLATION

    1. Turn the engine switch off.

    2. C144929C01

      *1

      Rear Speed Sensor

      *a

      No clearance

      *b

      OK

      *c

      NG

      Check the speed sensor installation.

      Click here

      OK

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

      The installation nut is tightened properly.

      Result

      Result

      OK

      NG
    NG

    INSTALL REAR SPEED SENSOR CORRECTLY

    OK

  2. INSPECT REAR SPEED SENSOR TIP

    1. Remove the front speed sensor.

      Click here

    2. Check the speed sensor tip.

      OK

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

      Note:

      If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

      Result

      Result

      OK

      NG
    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  3. INSPECT REAR SPEED SENSOR ROTOR

    1. Remove the rear axle hub and bearing assembly.

      Click here

    2. Check the speed sensor rotor.

      OK

      No scratches, oil, or foreign matter on the rotors.

      Tip:

      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.

      Result

      Result

      OK

      NG
    NG

    CLEAN OR REPLACE REAR SPEED SENSOR ROTOR

    OK

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

    1. Turn the engine 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.

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      RR Wheel Speed

      RL Wheel Speed

      Chassis > ABS/VSC/TRC > Data List

      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 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.

      Tip:

      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 hereClick 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

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    NG

  5. REPLACE REAR SPEED SENSOR

    1. Replace the rear speed sensor.

      Click here

      Result

      Result

      NEXT
    NEXT

  6. RECONFIRM DTC

    1. Clear the DTCs.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Clear DTCs

    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 output.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B
    A

    END

    B

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

    Click here