Dtc C1426 Stop Light Switch Off Stuck Malfunction

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

CHECK STOP LIGHT OPERATION

READ VALUE USING GTS (STOP LIGHT SW)

RECONFIRM DTC

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

RECONFIRM DTC

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

DTC C1426 Stop Light Switch OFF Stuck Malfunction


DESCRIPTION

The skid control ECU (master cylinder solenoid) inputs the stop light signal and brake operation condition. When the brake pedal is depressed and the stop light switch signal is not input, C1426 is output.

DTC Code
DTC Detection Condition
Trouble Area
C1426
When both of the following conditions are met:
  1. After the vehicle reaches 35 km/h or more, the PMC terminal voltage is continuously 0.86 V or higher for 1 second or more at a vehicle speed of 3 km/h or more.
  2. The stop light switch signal is not input for 5 seconds or more with the PMC terminal voltage at 0.86 V or higher while the IG terminal voltage is 9.5 V or higher and the vehicle speed is 3 km/h or less for a period of less than 0.6 seconds.
  1. Wire harness or connector
  2. STOP fuse
  3. Stop light switch assembly
  4. Skid Control ECU (Master cylinder solenoid)

WIRING DIAGRAM

Refer to DTC C1425 (Click here).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the skid control ECU (master cylinder solenoid), perform zero point calibration and store system information. (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

  1. Turn the ignition switch off.

  1. Check the brake pedal height and stop light switch assembly installation (for LHD: See Click here, for RHD: Click here).

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

    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION (Click here)

C
ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION (Click here)
A


2.CHECK STOP LIGHT OPERATION

  1. Check that the all stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

    OK:
    Condition
    		Illumination Condition
    Brake pedal depressed
    		On
    Brake pedal released
    		Off


NG
Go to step 5
OK


3.READ VALUE USING GTS (STOP LIGHT SW)

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the GTS 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
    		-

  1. Check that the stop light switch display observed on the GTS changes according to brake pedal operation.

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


NG
Go to step 8
OK


4.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Depress the brake pedal several times to test the stop light circuit.

  1. Check if the same DTC is output (Click here).

    Result
    Result
    		Proceed to
    DTC C1426 is not output
    		A
    DTC C1426 is output (for LHD)
    		B
    DTC C1426 is output (for RHD)
    		C
    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

USE SIMULATION METHOD TO CHECK (Click here)

5.INSPECT STOP LIGHT SWITCH ASSEMBLY

  1. Check the stop light switch assembly (Click here).

    OK:
    The stop light switch assembly is normal.


NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)
OK


6.CHECK HARNESS AND CONNECTOR (STP TERMINAL)

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (master cylinder solenoid) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A24-7 (STP) - Body ground
    		Brake pedal depressed
    		8 to 14 V
    Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK


7.RECONFIRM DTC

  1. Reconnect the A24 skid control ECU (master cylinder solenoid) connector.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Depress the brake pedal several times to test the stop light circuit.

  1. Check if the same DTC is output (Click here).

    Result
    Result
    		Proceed to
    DTC C1426 is not output
    		A
    DTC C1426 is output
    		B


B
INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) (Click here)
A

USE SIMULATION METHOD TO CHECK (Click here)

8.CHECK HARNESS AND CONNECTOR (STP TERMINAL)

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (master cylinder solenoid) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A24-7 (STP) - Body ground
    		Brake pedal depressed
    		8 to 14 V
    Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])

    Result
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
A

REPLACE MASTER CYLINDER SOLENOID (Click here)