ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C14B3

DTC Code DTC Name
C14B3 Reaction Force Pressure Sensor Zero Point Malfunction

DESCRIPTION

The reaction force pressure sensor detects and outputs the brake fluid pressure of the stroke simulator, which changes in accordance with brake pedal operation, to the skid control ECU (brake booster with master cylinder assembly).

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C14B3 Reaction Force Pressure Sensor Zero Point Malfunction 204

When the brake pedal is not depressed, the reaction force pressure sensor output value is -0.63 MPa (-6.4 kgf/cm2, -91.4 psi) or less or 1.53 MPa (15.6 kgf/cm2, 222 psi) or more for 3 seconds or more.

 Skid control ECU (brake booster with master cylinder assembly) Electronically controlled brake system 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

PROCEDURE


  1. CHECK BRAKE PEDAL


    1. Check that the brake pedal and the brake pedal stroke sensor assembly are properly installed and that the pedal can be depressed normally.

    2. Check and adjust the brake pedal height.

      for LHD: Click here

      for RHD: Click here

    3. Adjust the brake pedal stroke sensor assembly.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  2. READ VALUE USING GTS (REACTION FORCE PRESSURE)


    1. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Reaction Force Pressure Pressure value of stroke simulator Min.: 0.00 MPa, Max.: 24.48 MPa Brake pedal released: 0.00 MPa Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Reaction Force Pressure

    2. Check that the reaction force pressure sensor output value is within 0.00 to 1.53 MPa when the brake pedal is not depressed.

      OK
      The reaction force pressure sensor output value is within 0.00 to 1.53 MPa.

      Tech Tips

      If the reaction force pressure sensor output value is within 0.00 to 1.53 MPa, the skid control ECU (brake booster with master cylinder assembly) automatically performs zero point calibration every time the power switch is turned on (IG).

      Therefore, if the reaction force pressure sensor output value is not within 0.00 to 1.53 MPa, replace the skid control ECU (brake booster with master cylinder assembly) with a new one.

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. 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

      Tech Tips

      Even if the DTC is cleared, it will immediately be output again if the reaction force pressure sensor zero point malfunction remains.

      Result
      Result Proceed to
      DTC C14B3 is not output. A
      DTC C14B3 is output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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