Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

RECONFIRM DTC

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

INSPECT STOP LIGHT SWITCH

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)

DTC C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


DESCRIPTION

The master cylinder pressure sensor is connected to the skid control ECU.

DTC No.
DTC Detection Condition
Trouble Area
C1422
When the stop light switch is OFF, the PMC terminal voltage is more than 0.86 V for 5 seconds or more.
  1. Stop light switch
  2. Stop light switch circuit
  3. Master cylinder pressure sensor circuit
  4. Brake actuator assembly (Master cylinder pressure sensor)

WIRING DIAGRAM


Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR078X.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
When C1425 is output together with C1422, inspect and repair the trouble areas indicated by C1425 first (YARIS_NCP93 RM000000XIE0G9X.html).
1.CHECK DTC

  1. Check the DTC C1425 is output (YARIS_NCP93 RM000000XHV0CQX.html).

    Result
    Result
    		Proceed to
    DTC C1425 is not output
    		A
    DTC C1425 is output
    		B


B
GO TO DTC CHART (YARIS_NCP93 RM000000XHU08YX.html)
A


2.READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menu: Chassis / ABS/VSC/TRAC / Data List.

  1. According to the display on the Techstream, read the Data List.

    ABS/VSC/TRAC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Stop Light SW
    		Stop light switch/OFF or ON
    		OFF: Brake pedal released
    ON: Brake pedal applied
    		-
    Master Cylinder Sensor
    		Master cylinder pressure sensor reading/Min.: 0 V, Max.: 5 V
    		0.3 to 0.9 V: When brake pedal is released
    		Reading increases when brake pedal is depressed.
    Standard Voltage:
    Master cylinder pressure sensor reading is 0.86 V or less at the instant the stop light switch changes from off to on.


NG
Go to step 4
OK


3.RECONFIRM DTC

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0CQX.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 recorded (YARIS_NCP93 RM000000XHV0CQX.html).

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


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0ANX.html)

4.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. (YARIS_NCP93 RM000004O2F008X.html)

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


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH (YARIS_NCP93 RM000004O2F008X.html)
OK


5.INSPECT STOP LIGHT SWITCH

  1. Remove the stop light switch assembly (YARIS_NCP93 RM000004O2H008X.html).

  1. Inspect the stop light switch assembly (YARIS_NCP93 RM000004O2F008X.html).



NG
REPLACE STOP LIGHT SWITCH (YARIS_NCP93 RM000004O2H008X.html)
OK


6.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)

  1. Disconnect the skid control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A70-2 (STP) - A65-1
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)