Dtc C1429 Open Or Short In Brake Pedal Load Sensing Switch


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (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)

DTC C1429 Open or Short in Brake Pedal Load Sensing Switch


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
C1429
An open or short in the brake pedal load sensing switch continues for 0.3 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)

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1429 Open Or Short In Brake Pedal Load Sensing Switch


INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform calibration (LandCruiser RM000000XHR0BJX.html).
HINT:
When DTC C1425 is output together with DTC C1429, inspect and repair the trouble areas indicated by DTC C1425 first (LandCruiser RM000000XIE0VDX.html).
1.READ VALUE USING INTELLIGENT TESTER (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
    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 brake pedal load sensing switch display observed on the intelligent tester changes according to the brake pedal operation.

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


NG
Go to step 3
OK


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
    DTC is not output
    		A
    DTC is 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 C1429 Open Or Short In Brake Pedal Load Sensing Switch


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)