Dtc C1429 Open Or Short In Brake Pedal Load Sensing Switch

Brake. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Brake Control Dynamic Control Systems. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

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 a force exceeding a predetermined level.
The skid control ECU (brake actuator assembly) 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. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1429 Open Or Short In Brake Pedal Load Sensing Switch


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the brake actuator assembly, perform calibration (HILUX_TGN26 RM000000XHR073X.html).
  2. Before disconnecting the connector, make sure that there are no problems with the connection.
  3. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
HINT:
When DTC C1425 is output together with DTC C1429, inspect and repair the trouble areas indicated by DTC C1425 first (HILUX_TGN26 RM000000XIE0FWX.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. Clear the DTC (HILUX_TGN26 RM000000XHV0CGX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Depress the brake pedal several times.

  1. Check if the same DTC is output (HILUX_TGN26 RM000000XHV0CGX.html).

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


B
REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K000WX.html)
A

USE SIMULATION METHOD TO CHECK (HILUX_TGN26 RM000004QR7002X.html)

3.INSPECT BRAKE PEDAL LOAD SENSING SWITCH

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.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 (Closed)
*c
Brake Pedal Depressed (Open)
-
-
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. Disconnect the brake pedal load sensing switch (brake with switch pedal sub-assembly) connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    2 - 1
    		Brake pedal depressed
    		950 to 1050 Ω
    Brake pedal released
    		203 to 223 Ω


NG
REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY (HILUX_TGN26 RM0000010K801DX.html)
OK


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

  1. Turn the ignition switch off.

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

  1. Disconnect the brake pedal load sensing switch (brake with switch pedal sub-assembly) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A36-27 (FSW+) - A35-2
    		Always
    		Below 1 Ω
    A36-27 (FSW+) - Body ground
    		Always
    		 10 kΩ or higher
    A35-1 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K000WX.html)