VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1429

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

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
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 pedal load sensing switch circuit

  • Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

A019LYXE01

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 C1429, 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 (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
      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 brake pedal load sensing switch display observed on the intelligent tester changes according to 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 engine switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Perform the road test.

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

      Result
      Result Proceed to
      DTC (C1429) is not output A
      DTC (C1429) is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    A019NASE01

    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 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
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

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

    C

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

    A

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


    1. A019JOOE12
      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
      A44-27 (FSW+) - A48-2 (FSW+) Always Below 1 Ω
      A44-27 (FSW+) - Body ground Always 10 kΩ or higher
      A48-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here