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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1430, C1431

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

The brake pedal load sensing switch is turned on 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 ignition 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
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WIRING DIAGRAM

Refer to DTC C1429 (Click here).

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INSPECTION PROCEDURE

Note:

When replacing the brake actuator assembly, perform zero point calibration (Click here).

Tip:

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

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PROCEDURE


  1. Click here

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Select the Data List mode on the intelligent tester (Click here).

      Table 1. ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Lamp 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 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

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    RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs (Click here).

    3. Start the engine.

    4. Perform the road and braking 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

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    INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    Note:

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

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


    1. Turn the ignition 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 (FSW-)

      Brake pedal load sensing switch OFF

      (Brake pedal depressed)

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

      Brake pedal load sensing switch ON

      (Brake pedal released)

      		 203 to 223 Ω

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


    1. A017DZWE03

      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
      A24-27 (FSW+) - A21-2 (FSW+) Always Below 1 Ω
      A24-27 (FSW+) - Body ground Always 10 kΩ or higher
      A21-1 (FSW-) - Body ground Always Below 1 Ω

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    CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION


    1. Turn the ignition 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.

  6. Click here

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)Click here

  7. Click here

    REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH)Click here

  8. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

  9. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCHClick here