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 sends a signal when the brake pedal is depressed with force exceeding a predetermined level.

The skid control ECU 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 load sensing switch circuit

C1431

Either of the following is detected:


  1. Immediately after the engine switch is turned on (IG), 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 load sensing switch circuit

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 INTELLIGENT TESTER (STOP LIGHT SWITCH AND BRAKE PEDAL LOAD SENSING SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Select the Data List on the intelligent tester Click here.

      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

      -
    4. Check that the stop light switch display and brake pedal load sensing switch display observed on the intelligent tester change according to brake pedal operation.

      OK
      The intelligent tester displays ON or OFF according to brake pedal operation.
    5. Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch are turned on.

      OK
      First the stop light switch should be turned on, and then the brake pedal load sensing switch should be turned 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 is turned on first) C

    B
    C
    A
  2. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Perform a road test.

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

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

    B
    A
  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    A0161L7E04

    Note


    • Do not remove the brake pedal load sensing switch from the brake pedal support assembly.

    • When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal support assembly.


    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 brake pedal load sensing switch connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (FSW+) - 1 (GND)

      Brake pedal load sensing switch OFF

      (Brake pedal depressed)

      950 to 1050 Ω
      2 (FSW+) - 1 (GND)

      Brake pedal load sensing switch ON

      (Brake pedal released)

      203 to 223 Ω

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


    1. A016213E15
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      *2

      Front view of wire harness connector

      (to Brake Pedal Load Sensing Switch)

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

    2. Disconnect the skid control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A62-27 (FSW+) - A23-2 (FSW+) Always Below 1 Ω
      A62-27 (FSW+) - Body ground Always 10 kΩ or higher
      A23-1 (GND) - Body ground Always Below 1 Ω

    NG
    OK
  5. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION


    1. Turn the engine switch off.

    2. Check the brake pedal height and stop light switch installation Click here.

      OK
      The brake pedal height and stop light switch installation are normal.

    NG
    OK