ANTI-LOCK BRAKE 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 operates 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 condition is met:


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

  • Brake pedal load sensing switch (Brake with switch pedal sub-assembly)

  • Brake pedal load sensing switch circuit

  • Brake actuator assembly (Skid control ECU)
C1431

Either condition is met:


  1. Immediately after the ignition switch is turned to ON, 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.

WIRING DIAGRAM

Refer to DTC C1429 Click here.

CAUTION / NOTICE / HINT

Note

When replacing the brake actuator assembly, perform calibration Click here.

Tech Tips

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

PROCEDURE


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


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester 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 specified point

      OFF: Brake pedal not depressed beyond specified point

      		 -

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

      OK
      The intelligent tester 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
      The stop light switch turns on first, and then the brake pedal load sensing switch turns on.
      Result
      Result Proceed to
      OK A
      NG Turning on of brake pedal load sensing switch is not confirmed B
      Brake pedal load sensing switch turns on first C

    B

    INSPECT BRAKE PEDAL LOAD SENSING SWITCH Click here

    C

    CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION Click here

    A

  2. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Perform a road and braking 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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    B001ER7E01
    Text in Illustration
    *1 Brake Pedal Load Sensing Switch *2 Brake with Switch Pedal Sub-assembly
    *a

    Component without harness connected

    (Brake Pedal Load Sensing Switch)

    		 *b Brake Pedal Released (On)
    *c Brake Pedal Depressed (Off) - -

    Note


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

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


    1. Turn the ignition switch off.

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

    3. Disconnect the A11 brake pedal load sensing switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (FSW+) - 1 (FSW-) Brake pedal depressed 0.9 to 1.1 kΩ
      Brake pedal released 192 to 234 Ω

    NG

    REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY Click here

    OK

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


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

    2. Disconnect the A6 skid control ECU connector.

    3. Disconnect the A11 brake pedal load sensing switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A6-27 (FSW+) - A11-2 (FSW+) Always Below 1 Ω
      A6-27 (FSW+) - Body ground Always 10 kΩ or higher
      A11-1 (FSW-) - Body ground Always Below 1 Ω

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. 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.

    OK

    REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY Click here

    NG

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH Click here