VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1422

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

DESCRIPTION

Refer to DTCs C1281, C1421, C1423 and C1424.

Click here

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

  • Stop light switch circuit

  • 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. Check the DTC C1380 (w/ Stop Light control Relay) or C1425 is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1380 (w/ Stop Light control Relay) or C1425 is not output

      A

      DTCs C1422 and C1380 are output (w/ Stop Light control Relay)

      B

      DTCs C1422 and C1425 are output

      C
    B

    GO TO DTC CHART

    Click here

    C

    GO TO DTC CHART

    Click here

    A

  2. READ VALUE USING GTS (STOP LIGHT SW, MASTER CYLINDER 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/TRC / 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

    Stop Light SW

    Stop light switch assembly

    OFF or ON

    OFF: Brake pedal released

    ON: Brake pedal depressed

    -

    Master Cylinder Sensor

    Master cylinder pressure sensor reading

    Min.: 0 V, Max.: 5 V

    Brake pedal released: 0.3 to 0.9 V

    Reading increases when brake pedal is depressed.

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Stop Light SW

    Master Cylinder Sensor

    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.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATIONClick here

    OK

  3. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

    2. Start the engine.

    3. 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).

    4. Check if the same DTC is recorded.

      Click here

    Chassis > ABS/VSC/TRC > Clear DTCs

    Chassis > ABS/VSC/TRC > 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 hereClick hereClick hereClick here

    DTC C1422 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

  4. 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

  5. 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

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

    1. Disconnect the A64 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A64-2 (STP) - A5-1

      Always

      Below 1 Ω

      A64-2 (STP) or A5-1 - Body ground

      Always

      10 kΩ or higher

      A64-22 (STP2) - A5-1*

      Always

      Below 1 Ω

      A64-22 (STP2) or A5-1 - Body ground*

      Always

      10 kΩ or higher

      • *: w/ Stop Light Control Relay

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR