ANTI-LOCK BRAKE SYSTEM(for Type B), Diagnostic DTC:C1403 and C1404

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

DESCRIPTION

Refer to DTCs C1415 and C1416.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1403

Rear Speed Sensor RH Malfunction

Any of the following conditions 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 a cumulative time of 200 seconds.

  • Rear speed sensor RH

  • Sensor installation

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

C1404

Rear Speed Sensor LH Malfunction

Any of the following conditions 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 a cumulative time of 200 seconds.

  • Rear speed sensor LH

  • Sensor installation

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

Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed:

  1. Drive the vehicle at 20 km/h (12 mph) for 30 seconds or more and check that the ABS warning light goes off.

  2. Clear the DTCs.

Tip:

  • DTC C1403 is for the rear speed sensor RH.

  • DTC C1404 is for the rear speed sensor LH.

PROCEDURE

  1. CHECK REAR SPEED SENSOR INSTALLATION

    1. C210569C04

      *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.

    Result

    Proceed to

    OK

    NG
    NG

    INSTALL REAR SPEED SENSOR CORRECTLY

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    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

      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

    4. Check the speed value output from the speed sensor displayed on the GTS.

      Tip:

      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 hereClick 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.

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      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 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.

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    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

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    NG

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY WITH REAR SPEED SENSOR

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