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 (brake actuator assembly) detects if the brake pedal is depressed or not via this circuit.

DTC Code DTC Detection Condition Trouble Area
C1429 When the voltage at terminal IG1 is 9.5 V or higher, 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 support assembly)

  • Brake pedal load sensing switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01FDQIE12

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 GTS (BRAKE PEDAL LOAD SENSING SW)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS 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 the specified point

      OFF: Brake pedal not depressed beyond the specified point

      		 -

    6. Check that the brake pedal load sensing switch display observed on the GTS changes according to brake pedal operation.

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

    NG

    INSPECT BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT ASSEMBLY) Click here

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Start the engine.

    4. 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

    INSPECT BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT ASSEMBLY) Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT ASSEMBLY)


    1. Inspect the brake pedal load sensing switch (brake pedal support assembly) Click here.


    NG

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Click here

    OK

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


    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 A13 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the A6 brake pedal load sensing switch (brake pedal support assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-27 (FSW+) - A6-2 (FSW+) Always Below 1 Ω
      A13-27 (FSW+) - Body ground Always 10 kΩ or higher
      A6-1 (FSW-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here