VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1422

DTC Code DTC Name
C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1422

Master Cylinder Pressure Sensor Zero Point High Malfunction

When the stop light switch is OFF, the PMC terminal voltage is more than 0.86 V for 5 seconds or more while the vehicle is being driven at a speed of 3 km/h (2 mph) or more.

  • STOP fuse

  • Stop light switch assembly

  • Wire harness or connector

  • Skid control ECU (Brake actuator assembly)

  • Brake actuator assembly (Master cylinder pressure sensor)

WIRING DIAGRAM

Refer to DTC C1425.

Click here

CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

  1. CHECK DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Perform a road test.

    5. Check for DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Proceed to

      DTC C1422 is output

      DTCs C1422 and C1380 are output

      DTCs C1422 and C1425 are output
    DTCs C1422 and C1380 are output

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    Click here

    DTCs C1422 and C1425 are output

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    Click here

    DTC C1422 is output

  2. READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

    5. In accordance with the display on the GTS, read the Data List.

    6. Check that the stop light switch assembly condition observed on the GTS changes according to brake pedal operation.

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Measurement Item

    Range

    Normal Condition

    Diagnostic Note

    Stop Light SW

    Stop light switch assembly

    ON or OFF

    OFF: Brake pedal released

    ON: Brake pedal depressed

    -

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Stop Light SW

    OK

    The GTS displays ON or OFF according to brake pedal operation.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATIONClick here

    OK

  3. READ VALUE USING GTS (MASTER CYLINDER PRESSURE SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

    5. In accordance with the display on the GTS, read the Data List.

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Measurement Item

    Range

    Normal Condition

    Diagnostic Note

    Master Cylinder Pressure

    Master cylinder pressure sensor pressure

    Min.: 0.00 MPa

    Max.: 23.28 MPa

    Brake pedal operated: Proportional to pedal force

    Brake pedal released: 0.00 to 1.76 MPa

    -

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Master Cylinder Pressure

    OK

    Data List pressure is within standard range.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    OK

  4. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Perform a road test.

    5. Check if the same DTC is recorded.

      Click here

    Chassis > ABS/VSC/TRAC > Clear DTCs

    Chassis > ABS/VSC/TRAC > Trouble Codes

    Result

    Proceed to

    DTC C1422 is not output

    DTC C1422 is output
    DTC C1422 is not output

    USE SIMULATION METHOD TO CHECK

    Click here

    DTC C1422 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

  5. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION

    1. Turn the ignition switch off.

    2. Check the brake pedal height and stop light switch assembly installation.

      Click here

      OK

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

    Result

    Proceed to

    OK

    NG
    NG

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH

    Click here

    OK

  6. INSPECT STOP LIGHT SWITCH ASSEMBLY

    1. Remove the stop light switch assembly.

      Click here

    2. Inspect the stop light switch assembly.

      Click here

      Result

      Proceed to

      OK

      NG
    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (STP TERMINAL)

    1. C342353C29

      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

      Turn the ignition switch off.

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

    3. Disconnect the A80 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A80-35 (STP) - Body ground

      Brake pedal depressed

      8 to 14 V

      Brake pedal released

      Below 1.5 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR