ANTI-LOCK BRAKE 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 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

  • Skid control 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 Test Mode (Signal Check) to acquire the rear differential lock identification information.

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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.

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PROCEDURE


  1. CHECK DTC


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

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

    DTC is output

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    DTC is not output

  2. CHECK TIRES


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

      OK
      All 4 tires are the same size and in the same condition.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Perform the following 3 times:

      Turn the ignition switch to ON and start the engine, drive the vehicle at a speed of 30 km/h (19 mph) or more for at least 30 seconds, and then stop the vehicle and turn the ignition switch off.

    4. Check if the same DTC is output.

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

    DTC is output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    DTC is not output

    USE SIMULATION METHOD TO CHECK Click here