Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

RECONFIRM DTC

INSPECT SKID CONTROL ECU (STP TERMINAL)

DTC C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


DESCRIPTION

The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.

Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction


DTC Code
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

Refer to DTC C1425 (Link).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (COROLLA_ZRE142 RM000000XHR08KX.html).
HINT:
When C1425 is output together with C1422, inspect and repair the trouble areas indicated by C1425 first (COROLLA_ZRE142 RM000000XIE0L1X.html).
1.CHECK STOP LIGHT OPERATION

  1. Check that the 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
INSPECT STOP LIGHT CIRCUIT (COROLLA_ZRE142 RM000002CE20DLX.html)
OK


2.READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Select the Data List on the Techstream (COROLLA_ZRE142 RM000000XHW0BYX.html).

    ABS/VSC/TRAC
    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 condition observed on the Techstream changes according to brake pedal operation.

    OK:
    The Techstream 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 (COROLLA_ZRE142 RM000002W8X04UX.html).

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


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH (COROLLA_ZRE142 RM000002W8X04UX.html)
OK


4.RECONFIRM DTC

  1. Clear the DTCs (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000000XHV0F2X.html).

    Result:

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


B
REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM000003CZU00MX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (COROLLA_ZRE142 RM000000XHP0EKX.html)

5.INSPECT SKID CONTROL ECU (STP TERMINAL)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

  1. Disconnect the skid control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A66-2 (STP) - Body ground
    		Stop light switch ON
    (Brake pedal depressed)
    		8 to 14 V
    A66-2 (STP) - Body ground
    		Stop light switch OFF
    (Brake pedal released)
    		Below 1.5 V


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

REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM000003CZU00MX.html)