VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1422 and C1456

DTC Code DTC Name
C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction
C1456 Control Pressure Sensor Zero Point High

DESCRIPTION

Refer to DTCs C1421, C1423, C1424, C1455, C1457 and C1458 (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 PM/C1 terminal voltage is 0.86 V or higher for 5 seconds or more.

  • STOP fuse

  • Stop light switch

  • Stop light switch circuit

  • Master cylinder pressure sensor circuit

  • Master cylinder solenoid (Master cylinder pressure sensor)

C1456

Control Pressure Sensor Zero Point High

When the stop light switch is off, the PCTRL terminal voltage is 0.86 V or higher for 5 seconds or more.

  • STOP fuse

  • Stop light switch

  • Stop light switch circuit

  • Pressure control sensor circuit

  • Master cylinder solenoid (Pressure control sensor)

WIRING DIAGRAM

Refer to DTC C1380 (Click here).

CAUTION / NOTICE / HINT

Note:
  • When replacing the master cylinder solenoid, perform calibration (Click here).

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

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      Chassis > ABS/VSC/TRC > Data List

      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

      -

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

      OK

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

      Result

      Result

      OK

      NG

    NG

    CHECK TERMINAL VOLTAGE (STOP LIGHT SWITCH POWER SOURCE TERMINAL)Click here

    OK
  2. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

    1. Turn the engine switch off.

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

      Click here

      OK

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

      Result

      Result

      OK

      NG

    NG

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH

    OK
  3. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    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 output.

      Click here

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE MASTER CYLINDER SOLENOID

  4. CHECK TERMINAL VOLTAGE (STOP LIGHT SWITCH POWER SOURCE TERMINAL)

    1. Make sure that there is no looseness in the locking part and connecting part of the connectors.

    2. Disconnect the A5 stop light switch connector.

    3. C215186C01

      *a

      Front view of wire harness connector

      (to Stop Light Switch)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A5-2 - Body ground

      Always

      11 to 14 V

      Result

      Result

      OK

      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  5. INSPECT STOP LIGHT SWITCH

    1. Remove the stop light switch.

      Click here

    2. C215187C01

      *a

      Component without harness connected

      (Stop Light Switch)

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      1 - 2

      Switch pin not pushed in

      Below 1 Ω

      Switch pin pushed in

      10 kΩ or higher

      Result

      Result

      OK

      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    OK
  6. CHECK TERMINAL VOLTAGE (STP)

    1. Disconnect the A7 skid control ECU connector.

    2. C214161C05

      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A7-7 (STP) - Body ground

      Brake pedal depressed

      8 to 14 V

      Brake pedal released

      Below 1.5 V

      Result

      Result

      OK

      NG

    OK

    REPLACE MASTER CYLINDER SOLENOID

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR