Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION

RECONFIRM DTC

CHECK TERMINAL VOLTAGE AND RESISTANCE (STOP LIGHT SWITCH ASSEMBLY POWER SOURCE TERMINAL)

CHECK TERMINAL VOLTAGE (STP)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - MASTER CYLINDER SOLENOID)

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 (LandCruiser RM000000XIG0QHX_01.html).

DTC Code
DTC Detection Condition
Trouble Area
C1422
When the 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 the 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 C1425 (LandCruiser RM000000XIE0VFX_02.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the skid control ECU (master cylinder solenoid), perform calibration (LandCruiser RM00000452J00ZX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
When DTC C1425 is output together with DTC C1422 and/or C1456, inspect and repair the trouble areas indicated by DTC C1425 first (LandCruiser RM000000XIE0VFX.html).
1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT 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
    		-

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

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


NG
Go to step 4
OK


2.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION

  1. Turn the ignition switch off.

  1. Check the brake pedal height and stop light switch assembly installation (LandCruiser RM000001QHK02LX.html).

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


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY (LandCruiser RM000001QHK02LX.html)
OK


3.RECONFIRM DTC

  1. Clear the DTC (LandCruiser RM0000046KV016X.html).

  1. Start the engine.

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

  1. Check if the same DTC is output (LandCruiser RM0000046KV016X.html).

    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 (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.CHECK TERMINAL VOLTAGE AND RESISTANCE (STOP LIGHT SWITCH ASSEMBLY POWER SOURCE TERMINAL)

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

  1. Disconnect the A85 stop light switch assembly connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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
    A85-1(B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A85-3 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Switch Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK TERMINAL VOLTAGE (STP)

  1. Disconnect the A54 stop light control ECU assembly connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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
    A54-5 (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 Stop Light Control ECU Assembly)


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A


6.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - MASTER CYLINDER SOLENOID)

  1. Disconnect the A85 stop light switch assembly connector.

  1. Disconnect the A7 skid control ECU (master cylinder solenoid) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A85-2 (L) - A7-7 (STP)
    		Always
    		Below 1 Ω
    A85-2 (L) or A7-7 (STP) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY (LandCruiser RM000003QJT01GX.html)