VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1430, C1431

DTC Code DTC Name
C1430 Brake Pedal Load Sensing Switch OFF Stuck Malfunction
C1431 Brake Pedal Load Sensing Switch ON Stuck Malfunction

DESCRIPTION

The brake pedal load sensing switch (brake pedal support assembly) is turned on when the brake pedal is depressed with force exceeding a predetermined level.

The skid control ECU (brake actuator assembly) detects if the brake pedal is depressed or not via this circuit.

DTC Code DTC Detection Condition Trouble Area
C1430

Either of the following is detected:


  1. With the stop light switch ON, the brake pedal load sensing switch OFF, and the master cylinder pressure 6 MPa or more, the deceleration is 0.4 G or more for 1 second or more.

  2. With the stop light switch ON, the brake pedal load sensing switch OFF, and the master cylinder pressure 6 MPa or more, the vehicle speed is 0 km/h (0 mph) for 5 seconds or more.

  • Brake pedal load sensing switch (Brake pedal support assembly)

  • Brake pedal load sensing switch circuit

  • Skid control ECU (Brake actuator assembly)
C1431

Either of the following is detected:


  1. The brake pedal load sensing switch is ON and the stop light switch is OFF for 10 seconds or more.

  2. The condition that the brake pedal load sensing switch remains ON while the vehicle speed increases from 0 km/h (0 mph) to 30 km/h (18 mph) occurs 5 times in succession.

  • Brake pedal load sensing switch (Brake pedal support assembly)

  • Brake pedal load sensing switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C1429 Click here.

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

Tech Tips

When DTC C1425 and/or C1426 is output together with DTC C1430 and/or C1431, inspect and repair the trouble areas indicated by DTC C1425 and/or C1426 first Click here, or Click here.

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT SW/BRAKE PEDAL LOAD SENSING SW)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch / ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -
      Brake Pedal Load Sensing SW Brake pedal load sensing switch / ON or OFF

      ON: Brake pedal depressed beyond the specified point

      OFF: Brake pedal not depressed beyond the specified point

      		 -

    6. Check that the stop light switch display and brake pedal load sensing switch display observed on the GTS change according to brake pedal operation.

      OK
      The GTS displays ON or OFF according to brake pedal operation.

    7. Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn ON.

      OK
      First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON.
      Result
      Result Proceed to
      OK A
      NG (Turning on of the brake pedal load sensing switch is not confirmed) B
      NG (The brake pedal load sensing switch turns on first) C

    B

    INSPECT BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT ASSEMBLY) Click here

    C

    ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION Click here

    A

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Start the engine.

    4. Perform the road test.

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTCs (C1430 and C1431) are not output A
      DTCs (C1430 and/or C1431) are output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT ASSEMBLY)


    1. Inspect the brake pedal load sensing switch (brake pedal support assembly) Click here.


    NG

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL LOAD SENSING SWITCH)


    1. Turn the engine switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    3. Disconnect the A13 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the A6 brake pedal load sensing switch (brake pedal support assembly) connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-27 (FSW+) - A6-2 (FSW+) Always Below 1 Ω
      A13-27 (FSW+) - Body ground Always 10 kΩ or higher
      A6-1 (FSW-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  5. ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION


    1. Adjust the brake pedal height and stop light switch installation Click here.


    NEXT

  6. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Start the engine.

    4. Perform the road test.

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTCs (C1430 and C1431) are not output A
      DTCs (C1430 and/or C1431) are output B

    B

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Click here

    A

    END