Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (STOP LIGHT SW)

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

RECONFIRM DTC

INSPECT STOP LIGHT SWITCH

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

DTC C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

DTC C1456 Control Pressure Sensor Zero Point High


DESCRIPTION

Refer to DTCs C1421, C1423, C1424, C1455, C1457 and C1458 (Click here).

DTC Code
DTC Detection Condition
Trouble Area
C1422
When vehicle speed is 3 km/h (2 mph) or more and stop light switch is off, the PM/C1 terminal voltage is 0.86 V or higher for 5 seconds or more.
  1. STOP fuse
  2. Stop light switch assembly
  3. Stop light switch circuit
  4. Master cylinder pressure sensor circuit
  5. Master cylinder solenoid (Master cylinder pressure sensor)
C1456
When vehicle speed is 3 km/h (2 mph) or more and stop light switch is off, the PCTRL terminal voltage is 0.86 V or higher for 5 seconds or more.
  1. STOP fuse
  2. Stop light switch assembly
  3. Stop light switch circuit
  4. Pressure control sensor circuit
  5. Master cylinder solenoid (Pressure control sensor)

WIRING DIAGRAM

Refer to DTC C1380 (Click here).

INSPECTION PROCEDURE

NOTICE:
  1. After replacing the master cylinder solenoid, perform zero point calibration and store the system information (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.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 condition observed on the GTS changes according to brake pedal operation.

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


NG
Go to step 4
OK


2.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 (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 OR STOP LIGHT SWITCH (Click here)

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


3.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform a braking test (decelerate the vehicle by depressing the brake pedal).

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

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output (for LHD)
    		B
    DTC is output (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)

4.INSPECT STOP LIGHT SWITCH

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

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

    OK:
    The stop light switch assembly is normal.


NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)
OK


5.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 C1422 Master Cylinder Pressure Sensor Zero Point High 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
A

REPLACE MASTER CYLINDER SOLENOID (Click here)