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 that all 4 wheels are operating properly.

Therefore, all wheel signals must indicate the same speed.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1337 Diameter of the Tire is not Uniform

The following occurs in 3 consecutive trips:

At a vehicle speed of 20 km/h (12 mph) or more, there is a 20% difference or more in the average speed between the front wheels and rear wheels for 20 seconds or more.

  • Tire and wheel size

  • Tire deformation

  • Speed sensor rotor

  • Speed sensor

  • Speed sensor circuit

  • Skid control ECU (Brake actuator assembly)

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

Click here

Tech Tips

When C1401 to C1408 and/or C1413 to C1416 are output with C1337, inspect and repair the trouble areas indicated by C1401 to C1408 and/or C1413 to C1416 first.

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PROCEDURE


  1. CHECK TIRE SIZE


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

      Tech Tips

      The DTC is output when tire deformation or a difference in tire size is detected.

      OK
      The diameter of all 4 tires and air pressure are the same.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME SIZE

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Proceed to
      DTC C1337 is output
      DTC C1337 is not output

    DTC C1337 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    DTC C1337 is not output

    USE SIMULATION METHOD TO CHECK Click here