VEHICLE STABILITY CONTROL SYSTEM(for Vacuum Brake Booster), Diagnostic DTC:C1429

DTC Code DTC Name
C1429 Open or Short in Brake Pedal Load Sensing Switch

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
C1429 An open or short in the brake pedal load sensing switch continues for 0.3 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)

WIRING DIAGRAM

B001CZXE03
*a Brake Pedal Load Sensing Switch
*b Brake Actuator Assembly (Skid Control ECU)

CAUTION / NOTICE / HINT

Note

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

Tech Tips

When DTC C1425 is output together with DTC C1429, inspect and repair the trouble areas indicated by DTC C1425 first Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (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
      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 brake pedal load sensing switch display observed on the intelligent tester changes according to the brake pedal operation.

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

    NG

    INSPECT BRAKE PEDAL LOAD SENSING SWITCH Click here

    OK

  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
      DTC is not output A
      DTC is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    B001ER7E03
    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