VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1430, C1431

DTC Code DTC Name
C1430 Brake Pedal Load Sensing Switch OFF Stuck Malfunction
C1431 Brake Pedal Load Sensing Switch ON Stuck Malfunction

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
C1430 Brake Pedal Load Sensing Switch OFF Stuck Malfunction

Either of the following is detected:


  1. With the stop light switch assembly on, the brake pedal load sensing switch off, and the master cylinder pressure 6 Mpa (61.2 kgf/cm2, 870 psi) or more, the deceleration is 0.4 G or more for 1 second or more.

  2. With the stop light switch assembly on, the brake pedal load sensing switch off, and the master cylinder pressure 6 Mpa (61.2 kgf/cm2, 870 psi) or more, the vehicle speed is 0 km/h (0 mph) for 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)
C1431 Brake Pedal Load Sensing Switch ON Stuck Malfunction

Either of the following is detected:


  1. Immediately after the engine switch is turned on (IG), the brake pedal load sensing switch is on and the stop light switch assembly is off for 10 seconds or more.

  2. The condition that the brake pedal load sensing switch remains on while the vehicle speed increases from 0 km/h (0 mph) to 30 km/h (19 mph) occurs 5 times in succession.

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

  • Brake pedal load sensing switch circuit

  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C1429.

Click here

CAUTION / NOTICE / HINT

Note

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

Click here

Tech Tips

When C1425 and/or C1426 is output together with C1430 and/or C1431, inspect and repair the trouble areas indicated by C1425 and/or C1426 first.

for C1425: Click here

for C1426: Click here

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY AND BRAKE PEDAL LOAD SENSING SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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
      Stop Light SW Stop light switch assembly ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -
      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
      Stop Light SW
      Brake Pedal Load Sensing SW

    4. Check that the stop light switch display and brake pedal load sensing switch display observed on the GTS change according to brake pedal operation.

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

    5. Slowly depress the brake pedal, and check when the stop light switch assembly and brake pedal load sensing switch turn on.

      OK
      First the stop light switch assembly should turn on, and then the brake pedal load sensing switch should turn on.
      Result
      Result Proceed to
      OK A
      NG (Turning on of the brake pedal load sensing switch is not confirmed.) B
      NG (The brake pedal load sensing switch turns on first.) C

    B

    INSPECT BRAKE PEDAL SUPPORT ASSEMBLY Click here

    C

    CHECK BRAKE PEDAL HEIGHT AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION Click here

    A

  2. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs.

      Click here


      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.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1430 and C1431 are not output. A
      DTCs C1430 and/or C1431 are output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  3. INSPECT BRAKE PEDAL SUPPORT ASSEMBLY


    1. B006OTAC01
      *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 A32 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

    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 SUPPORT ASSEMBLY)


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

    2. Disconnect the A50 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
      A50-23 (FSW+) - A32-2 (FSW+) Always Below 1 Ω
      A50-23 (FSW+) or A32-2 (FSW+) - Body ground Always 10 kΩ or higher
      A32-1 (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

  5. CHECK BRAKE PEDAL HEIGHT AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION


    1. Turn the engine switch off.

    2. Check the brake pedal height and stop light switch assembly installation.

      for LHD: Click here

      for RHD: Click here

      OK
      The brake pedal height and stop light switch assembly installation are normal.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    ADJUST BRAKE PEDAL HEIGHT OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION for LHD: Click here
    ADJUST BRAKE PEDAL HEIGHT OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION for RHD: Click here