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 turns on when the brake pedal is depressed with a force exceeding a predetermined level. The skid control ECU (brake actuator assembly) uses this circuit to detect if the brake pedal is depressed or not. (for 1AD-FTV)

DTC No. Detection Item DTC Detection Condition Trouble Area
C1429 Open or Short in Brake Pedal Load Sensing Switch An open or short in the brake pedal load sensing switch circuit continues for 0.5 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

A01TBXIE02
*a Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly)
*b Skid Control ECU (Brake Actuator Assembly)

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

    Click here

Tech Tips

When C1249, C1425 and/or C1426 is output together with C1429, inspect and repair the trouble areas indicated by C1249, C1425 and/or C1426 first.

for C1249: Click here

for C1425: Click here

for C1426: Click here

PROCEDURE


  1. READ VALUE USING GTS (BRAKE PEDAL LOAD SENSING SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List using the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      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 a specified point

      OFF: Brake pedal not depressed beyond a specified point

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Brake Pedal Load Sensing SW

    4. 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.
      Result
      Proceed to
      OK
      NG

    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


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1429 is not output. A
      DTC C1429 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

    A01T9T9C01
    *a

    Component without harness connected

    (Brake Pedal Load Sensing Switch (Brake Pedal Support 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 A111 brake pedal load sensing switch connector.

      Note


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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (FSW+) - 1 (FSW-)

      Switch OFF

      (Brake pedal depressed)

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

      Switch ON

      (Brake pedal released)

      		 203 to 223 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY for LHD: Click here
    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY for RHD: Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL LOAD SENSING SWITCH)


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

    2. Disconnect the A97 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A97-34 (FSW+) - A111-2 (FSW+) Always Below 1 Ω
      A97-34 (FSW+) or A111-2 (FSW+) - Body ground Always 10 kΩ or higher
      A111-1 (FSW-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR