VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1337

DTC Code DTC Name
C1337 Diameter of the Tire is not Uniform

DESCRIPTION

The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from the speed sensors. These signals are used for recognizing whether all 4 wheels are operating properly. Therefore, all wheel signals must indicate the same speed.

DTC Code DTC Detection Condition Trouble Area
C1337

Either condition is met:


  • The diameter of the 2 front wheels is different from the diameter of the 2 rear wheels.

  • A wheel speed sensor is faulty.

  • Tire and wheel size

  • Tire deformation

  • Skid control rotor

  • Speed sensor

  • Speed sensor circuit

  • Skid control ECU (Brake actuator assembly)

INSPECTION PROCEDURE

Note

After replacing the brake actuator assembly, perform calibration Click here.

PROCEDURE


  1. CHECK FOR DTC


    1. Check if any DTCs relating to the speed sensor circuit are output Click here.

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

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK TIRE SIZE


    1. Check the tire size and condition of all 4 wheels.

      OK
      All 4 tires are the same size and in the same condition.

    NG

    REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME SIZE AND IN THE SAME CONDITION

    OK

  3. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 30 km/h (18 mph) or more for at least 30 seconds.

    5. Check if the same DTC is output.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output for LHD B
      for RHD C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here