VEHICLE STABILITY CONTROL SYSTEM(for Vacuum Brake Booster), Diagnostic DTC:C1337

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

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 indicate the same speed.

DTC Code DTC Detection Condition Trouble Area
C1337

The following occurs in 3 consecutive trips:

At a vehicle speed of 20 km/h (12 mph) or more, there is a difference of 20% 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

  • Brake actuator assembly (Skid control ECU)

CAUTION / NOTICE / HINT

Note

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

Tech Tips

When DTCs C1401 to C1416 are output with DTC C1337, inspect and repair the trouble areas indicated by DTCs C1401 to C1416 first Click here.

PROCEDURE


  1. CHECK TIRES


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

      Tech Tips

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

      OK
      The diameter and air pressure of all 4 tires are the same.

    NG

    REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME SIZE

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    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.

      Result
      Result Proceed to
      DTC C1337 is output A
      DTC C1337 is not output B

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    B

    USE SIMULATION METHOD TO CHECK Click here