ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1407, C1408

DTC Code DTC Name
C1407 Open or Short in Rear Speed Sensor RH Circuit
C1408 Open or Short in Rear Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1273, C1274, C1403 and C1404 Click here.

DTC No. DTC Detection Condition Trouble Area

C1407

C1408

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

  • Rear speed sensor RH/LH

  • Brake actuator assembly

Tech Tips


  • DTC C1407 is for the rear speed sensor RH.

  • DTC C1408 is for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1273, C1274, C1403 and C1404 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR SPEED SENSOR)


    1. Turn the ignition switch off.

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

    3. Disconnect the R12 and/or R11 rear speed sensor connector.

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

      Standard Resistance
      RH
      Tester Connection Condition Specified Condition
      B9-16 (RR+) - R12-2 (RR+) Always Below 1 Ω
      B9-17 (RR-) - R12-1 (RR-) Always Below 1 Ω
      B9-16 (RR+) or R12-2 (RR+) - Body ground Always 10 kΩ or higher
      B9-17 (RR-) or R12-1 (RR-) - Body ground Always 10 kΩ or higher
      LH
      Tester Connection Condition Specified Condition
      B9-5 (RL+) - R11-2 (RL+) Always Below 1 Ω
      B9-4 (RL-) - R11-1 (RL-) Always Below 1 Ω
      B9-5 (RL+) or R11-2 (RL+) - Body ground Always 10 kΩ or higher
      B9-4 (RL-) or R11-1 (RL-) - Body ground Always 10 kΩ or higher

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    1. A01CH5EE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)
      *b RH
      *c LH

      Turn the ignition switch to ON.

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

      Standard Voltage
      RH
      Tester Connection Switch Condition Specified Condition
      R12-2 (RR+) - Body ground Ignition switch ON 8 to 17 V
      LH
      Tester Connection Switch Condition Specified Condition
      R11-2 (RL+) - Body ground Ignition switch ON 8 to 17 V

    3. Reconnect the R12 and/or R11 rear speed sensor connector.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    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

    Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  4. REPLACE REAR SPEED SENSOR


    1. Replace the rear speed sensor Click here.


    NEXT

  5. 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

    END