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VEHICLE STABILITY CONTROL SYSTEM(for TMC Made), Diagnostic DTC:C1422

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

The master cylinder pressure sensor is connected to the skid control ECU.

DTC No. 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.

  • Stop light switch

  • Stop light switch circuit

  • Master cylinder pressure sensor circuit

  • Brake actuator assembly (Master cylinder pressure sensor)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When replacing the brake actuator assembly, perform zero point calibration (Click here).

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

Tip:

When C1425 is output together with C1422, inspect and repair the trouble areas indicated by C1425 first (Click here).

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PROCEDURE


  1. Click here

    CHECK DTC


    1. Check the DTC C1425 is output (Click here).

      Table 1. Result
      Result Proceed to
      DTC C1425 is not output A
      DTC C1425 is output B

  2. Click here

    READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menu: Chassis / ABS/VSC/TRC / Data List.

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

      Table 2. ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW

      Stop light switch:

      ON or OFF

      ON: Brake pedal applied

      OFF: Brake pedal released

      		 -
      Master Cylinder Sensor Master cylinder pressure sensor reading/Min.: 0 V, Max.: 5 V When brake pedal is released: 0.3 to 0.9 V Reading increases when brake pedal is depressed.
      Standard
      Master cylinder pressure sensor reading is 0.86 V or less at the instant the stop light switch changes from off to on.

  3. Click here

    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).

      Table 3. Result
      Result Proceed to
      DTC C1422 is not output A
      DTC C1422 is output (for LHD) B
      DTC C1422 is output (for RHD) C

    • A

      CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (Click here)

    • B

      REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)

    • C

      REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)

  4. Click here

    CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION


    1. Turn the ignition 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.

  5. Click here

    INSPECT STOP LIGHT SWITCH


    1. A01VF5EE02

      Disconnect the stop light switch connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch pin released Below 1 Ω
      Switch pin pushed in 10 kΩ or higher
      3 - 4 Switch pin released 10 kΩ or higher
      Switch pin pushed in Below 1 Ω
      Table 4. Text in Illustration
      *a

      Component without harness connected

      (Stop Light Switch)
      *b Released
      *c Pushed in

  6. Click here

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)


    1. Disconnect the skid control ECU connector.

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

      Standard Resistance (except LHD with CVT)
      Tester Connection Condition Specified Condition
      A54-2 (STP) - A38-1 Always Below 1 Ω
      Standard Resistance (for LHD with CVT)
      Tester Connection Condition Specified Condition
      A56-2 (STP) - A38-1 Always Below 1 Ω
      Table 5. Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    • A

      REPAIR OR REPLACE HARNESS OR CONNECTOR

    • B

      REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)

    • C

      REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)