Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

RECONFIRM DTC

CHECK TERMINAL VOLTAGE (STOP LIGHT POWER SOURCE CIRCUIT)

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK TERMINAL VOLTAGE (STP TERMINAL)

DTC C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


DESCRIPTION

Refer to DTCs C1421, C1423 and C1424 (Toyota Fortuner RM000000XIG0DQX.html).

DTC Code
DTC Detection Condition
Trouble Area
C1422
When the stop light switch is off, the PMC terminal voltage is higher than 0.86 V for 5 seconds or more.
  1. STOP fuse
  2. Stop light switch assembly
  3. Stop light switch circuit
  4. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the brake actuator assembly, perform calibration (Toyota Fortuner RM000000XHR06WX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  3. Before disconnecting the connector, make sure that there are no problems with the connection.
  4. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
1.CHECK DTC

  1. Clear the DTC (Toyota Fortuner RM000000XHV0C7X.html).

  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 for DTCs (Toyota Fortuner RM000000XHV0C7X.html).

    Result
    Result
    		Proceed to
    DTC C1422 is output
    		A
    DTC C1422 and C1425 are output
    		B


B
GO TO DTC C1425 (Toyota Fortuner RM000000XIE0FMX.html)
A


2.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 the brake pedal operation.

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


NG
Go to step 5
OK


3.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 (Toyota Fortuner RM0000010K601KX.html).

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


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH (Toyota Fortuner RM0000010K500AX.html)
OK


4.RECONFIRM DTC

  1. Clear the DTC (Toyota Fortuner RM000000XHV0C7X.html).

  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 (Toyota Fortuner RM000000XHV0C7X.html).

    Result
    Result
    		Proceed to
    DTC C1422 is not output
    		A
    DTC C1422 is output
    		B


B
REPLACE BRAKE ACTUATOR ASSEMBLY (Toyota Fortuner RM0000010K0010X.html)
A

USE SIMULATION METHOD TO CHECK (Toyota Fortuner RM0000012Q9013X.html)

5.CHECK TERMINAL VOLTAGE (STOP LIGHT POWER SOURCE CIRCUIT)

  1. Turn the ignition switch off.

  1. Disconnect the stop light switch assembly connector.



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S14-2 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Switch Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT STOP LIGHT SWITCH ASSEMBLY

  1. Turn the ignition switch off.

  1. Remove the stop light switch assembly (Toyota Fortuner RM0000018VF002X.html).

  1. Inspect the stop light switch assembly (Toyota Fortuner RM0000018VD002X.html).



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (Toyota Fortuner RM0000018VF002X.html)
OK


7.CHECK TERMINAL VOLTAGE (STP TERMINAL)

  1. Turn the ignition switch off.

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



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S25-2 (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 [Brake Actuator Assembly])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (Toyota Fortuner RM0000010K0010X.html)