ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1405, C1406

DTC Code DTC Name
C1405 Open or Short in Front Speed Sensor RH Circuit
C1406 Open or Short in Front Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1271, C1272, C1401 and C1402 Click here.

DTC No. DTC Detection Condition Trouble Area

C1405

C1406

When any of following conditions detected:


  • Speed sensor signal open circuit continues for 0.5 seconds or more continuously.

  • While IG terminal voltage is within the normal range, speed sensor power source voltage is in a reduced condition for 0.5 seconds or more continuously.

  • Harness or connector

  • Front speed sensor RH/LH

  • Brake actuator assembly

Tech Tips


  • DTC C1405 is for the front speed sensor RH.

  • DTC C1406 is for the front speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1271, C1272, C1401 and C1402 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT FRONT SPEED SENSOR


    1. Remove the front speed sensor.

    2. A01CHQ0E01
      Text in Illustration
      *a

      Component without harness connected

      (Front Speed Sensor)
      *b Sensor Housing

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 0.9 to 1.3 kΩ
      1 - Sensor housing Always 10 MΩ or higher
      2 - Sensor housing Always 10 MΩ or higher

    3. Reinstall the front speed sensor.


    NG

    REPLACE FRONT SPEED SENSOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)


    1. Turn the ignition switch off.

    2. Disconnect the B9 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the F26 and/or F25 front speed sensor connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      RH
      Tester Connection Condition Specified Condition
      B9-6 (FR+) - F26-1 (FR+) Always Below 1 Ω
      B9-7 (FR-) - F26-2 (FR-) Always Below 1 Ω
      B9-6 (FR+) or F26-1 (FR+) - Body ground Always 10 kΩ or higher
      B9-7 (FR-) or F26-2 (FR-) - Body ground Always 10 kΩ or higher
      LH
      Tester Connection Condition Specified Condition
      B9-19 (FL+) - F25-1 (FL+) Always Below 1 Ω
      B9-18 (FL-) - F25-2 (FL-) Always Below 1 Ω
      B9-19 (FL+) or F25-1 (FL+) - Body ground Always 10 kΩ or higher
      B9-18 (FL-) or F25-2 (FL-) - Body ground Always 10 kΩ or higher

    5. Reconnect the B9 skid control ECU (brake actuator assembly) connector.

    6. Reconnect the F26 and/or F25 front speed sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTC Click here.

    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 recorded Click here.

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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here