Dtc C1430 Brake Pedal Load Sensing Switch Off Stuck Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW/BRAKE PEDAL LOAD SENSING SW)

RECONFIRM DTC

INSPECT BRAKE PEDAL LOAD SENSING SWITCH

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

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

DTC C1430 Brake Pedal Load Sensing Switch OFF Stuck Malfunction

DTC C1431 Brake Pedal Load Sensing Switch ON Stuck Malfunction


DESCRIPTION

The brake pedal load sensing switch operates 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
C1430
Either condition is met:
  1. With the stop light switch on, the brake pedal load sensing switch off and the master cylinder pressure at 6 MPa or more, the deceleration is 0.4 G or more for 1 second or more.
  2. With the stop light switch on, the brake pedal load sensing switch off and the master cylinder pressure at 6 MPa or more, the vehicle speed is 0 km/h (0 mph) for 5 seconds or more.
  1. Brake pedal load sensing switch (Brake with switch pedal sub-assembly)
  2. Brake pedal load sensing switch circuit
  3. Brake actuator assembly (Skid control ECU)
C1431
Either condition is met:
  1. Immediately after the ignition switch is turned to ON, the brake pedal load sensing switch is on and the stop light switch 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 (18 mph) occurs 5 times in succession.

WIRING DIAGRAM

Refer to DTC C1429 (LandCruiser RM000000XIR0CKX.html).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform calibration (LandCruiser RM000000XHR0BJX.html).
HINT:
When DTC C1425 is output together with DTC C1430 and/or C1431, inspect and repair the trouble areas indicated by DTC C1425 first (LandCruiser RM000000XIE0VDX.html).
1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW/BRAKE PEDAL LOAD SENSING SW)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Stop Light SW
    		Stop light switch / 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 specified point
    OFF: Brake pedal not depressed beyond specified point
    		-

  1. Check that the stop light switch display and brake pedal load sensing switch display observed on the intelligent tester change according to the brake pedal operation.

    OK:
    The intelligent tester displays ON or OFF according to brake pedal operation.

  1. Slowly depress the brake pedal and check when the stop light switch and brake pedal load sensing switch turn ON.

    OK:
    The stop light switch turns on first, and then the brake pedal load sensing switch turns on.

    Result
    Result
    		Proceed to
    OK
    		A
    NG
    		Turning on of brake pedal load sensing switch is not confirmed
    		B
    Brake pedal load sensing switch turns on first
    		C


B
Go to step 3

C
Go to step 5
A


2.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (LandCruiser RM000000XHV0KDX.html).

  1. Start the engine.

  1. Perform a road and braking test.

  1. Check if the same DTC is output (LandCruiser RM000000XHV0KDX.html).

    Result
    Result
    		Proceed to
    DTCs C1430 and C1431 are not output
    		A
    DTCs C1430 and/or C1431 are output
    		B


B
REPLACE BRAKE ACTUATOR ASSEMBLY (LandCruiser RM0000034UX02TX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

3.INSPECT BRAKE PEDAL LOAD SENSING SWITCH

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1430 Brake Pedal Load Sensing Switch Off Stuck Malfunction


Text in Illustration
*1
Brake Pedal Load Sensing Switch
*2
Brake with Switch Pedal Sub-assembly
*a
Component without harness connected
(Brake Pedal Load Sensing Switch)
*b
Brake Pedal Released (On)
*c
Brake Pedal Depressed (Off)
-
-
NOTICE:
  1. Do not remove the brake pedal load sensing switch from the brake with switch pedal sub-assembly.
  2. When there is a malfunction in the brake pedal load sensing switch, replace the brake with switch pedal sub-assembly.

  1. Turn the ignition switch off.

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

  1. Disconnect the A11 brake pedal load sensing switch connector.

  1. 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 depressed
    		0.9 to 1.1 kΩ
    Brake pedal released
    		192 to 234 Ω


NG
REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY (LandCruiser RM000002W9007HX.html)
OK


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

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

  1. Disconnect the A6 skid control ECU connector.

  1. Disconnect the A11 brake pedal load sensing switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A6-27 (FSW+) - A11-2 (FSW+)
    		Always
    		Below 1 Ω
    A6-27 (FSW+) - Body ground
    		Always
    		 10 kΩ or higher
    A11-1 (FSW-) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (LandCruiser RM0000034UX02TX.html)

5.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

  1. Turn the ignition switch off.

  1. Check the brake pedal height and stop light switch installation (LandCruiser RM000002W8X06QX.html).

    OK:
    The brake pedal height and stop light switch installation are normal.


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH (LandCruiser RM000002W8X06QX.html)
OK

REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY (LandCruiser RM000002W9007HX.html)