ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1337/37

DTC Code DTC Name
C1337/37 Different Diameter Tire Malfunction

DESCRIPTION

The skid control ECU measures the speed of each wheel by receiving signals from the speed sensors. These signals are used for recognizing that all 4 wheels are operating properly. Therefore, all wheel signals must be equal.

DTC No. DTC Detection Condition Trouble Area
C1337/37 The speed of one or more of the wheels differs from vehicle speed for 60 seconds or more while driving at 19 mph (30 km/h) or more.

  • Tire size

  • Speed sensor

  • Skid control rotor

  • Sensor installation

  • Brake actuator assembly

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK TIRE SIZE


    1. Check the size and condition of all 4 tires.


    NG

    REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE

    OK

  2. INSPECT SKID CONTROL ROTOR


    1. Check the rotor Click here for front, or Click here for rear).

      Note

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


    NG

    CLEAN OR REPLACE SKID CONTROL ROTOR

    OK

  3. INSPECT SPEED SENSOR


    1. Check the speed sensor and sensor tip Click here for front, or Click here for rear).

      Note

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


    NG

    CLEAN OR REPLACE SPEED SENSOR

    OK

  4. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND SPEED SENSOR)


    1. Check the speed sensor circuit Click here for front, or Click here for rear).


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Drive the vehicle at a speed of approximately 19 mph (30 km/h) or more for 60 seconds or more.

    3. Check that the same DTC is recorded Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result
      Condition Proceed to
      DTC (C1337/37) is output A
      DTC (C1337/37) is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY