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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1429

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

The brake pedal load sensing switch (brake pedal support assembly) 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.

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 0.3 seconds or more.

  • Brake pedal load sensing switch (brake pedal support assembly)

  • Brake pedal load sensing switch circuit

  • Skid control ECU (brake actuator assembly)
Table 1. *a Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly) *b Skid Control ECU (Brake Actuator Assembly)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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Tip:

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

for C1425:Click here

for C1426:Click here

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PROCEDURE


  1. Click here

    READ VALUE USING GTS (BRAKE PEDAL LOAD SENSING SWITCH)


    1. Select the Data List using the GTS.

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      1. 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

        		 -



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




    2. 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

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    RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs.

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      1. Chassis > ABS/VSC/TRC > Clear DTCs


    3. Turn the engine switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output.

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      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTC C1429 is not output. A
      DTC C1429 is output. B

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    INSPECT BRAKE PEDAL SUPPORT ASSEMBLY


    1. B0065SNC01
      *a

      Component without harness connected

      (Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly))

      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 A51 brake pedal load sensing switch (brake pedal support assembly) 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-) Brake pedal load sensing switch off (Brake pedal depressed) 950 to 1050 Ω
      2 (FSW+) - 1 (FSW-) Brake pedal load sensing switch on (Brake pedal released) 203 to 223 Ω
      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL SUPPORT ASSEMBLY)


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

    2. Disconnect the A86 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
      A86-23 (FSW+) - A51-2 (FSW+) Always Below 1 Ω
      A86-23 (FSW+) or A51-2 (FSW+) - Body ground Always 10 kΩ or higher
      A51-1 (FSW-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE BRAKE ACTUATOR ASSEMBLY for LHD:Click here

      REPLACE BRAKE ACTUATOR ASSEMBLY for RHD:Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR