ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1240

DTC Code DTC Name
C1240 Yaw Rate Sensor discrimination

DESCRIPTION

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

If the identification ID of the yaw rate and acceleration sensor (airbag sensor assembly) is different to that stored in the skid control ECU (brake booster with master cylinder assembly), DTC C1240 is stored.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1240 Yaw Rate Sensor discrimination 406 The identification ID sent from the yaw rate sensor is different to that stored in the skid control ECU (brake booster with master cylinder assembly) for 1 second or more.

  • Incorrect yaw rate sensor (airbag sensor assembly) installed

  • Skid control ECU (brake booster with master cylinder assembly)

 VSC DTC

CAUTION / NOTICE / HINT

Note


  • After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

    Click here

  • After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

    Click here

PROCEDURE


  1. CHECK PART NUMBER (AIRBAG SENSOR ASSEMBLY)


    1. Check that the proper yaw rate and acceleration sensor (airbag sensor assembly) is installed.

      OK
      Proper yaw rate and acceleration sensor (airbag sensor assembly) is installed.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1240 is output. A
      DTC C1240 is not output. B

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    B

    USE SIMULATION METHOD TO CHECK Click here