VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1422, 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 Code DTC Detection Condition Trouble Area
C1422 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 assembly

  • Stop light switch circuit

  • Master cylinder pressure sensor circuit

  • Master cylinder solenoid (Master cylinder pressure sensor)

C1456 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.

INSPECTION PROCEDURE

Note


  • After replacing the master cylinder solenoid, perform zero point calibration and store the system information Click here.

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

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT SW)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

      ABS/VSC/TRC
      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 GTS changes according to brake pedal operation.

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

    NG
    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 (for LHD: Click here, for RHD: Click here.

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

    NG
    OK
  3. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the engine switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform a braking test (decelerate the vehicle by depressing the brake pedal).

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B
    C
    A
  4. CHECK HARNESS AND CONNECTOR (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 stop light switch assembly connector.

    3. A01EQ77E05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A30-2 - Body ground Always 11 to 14 V

    NG
    OK
  5. INSPECT STOP LIGHT SWITCH


    1. Remove the stop light switch assembly Click here.

    2. A01ENRRE01
      Text in Illustration
      *a

      Component without harness connected

      (Stop Light Switch Assembly)

      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

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. Disconnect the skid control ECU (master cylinder solenoid) connector.

    2. A01ENMBE71
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A24-7 (STP) - Body ground Brake pedal depressed 8 to 14 V
      Brake pedal released Below 1.5 V
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B
    C
    A