VEHICLE STABILITY CONTROL SYSTEM(for TMMF Made), Diagnostic DTC:C1246, C1281

DTC Code DTC Name
C1246 Master Cylinder Pressure Sensor Malfunction
C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)

DESCRIPTION

The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.

DTC C1281 is deleted when the master cylinder pressure sensor sends a master cylinder pressure signal or test mode ends.

DTC C1281 is output only in test mode.

DTC No. DTC Detection Condition Trouble Area
C1246

When any of following conditions detected:


  1. Despite stop light switch signal being off, master cylinder pressure 10 bars (1000 kPa) or more for 8 minutes or more

  2. Malfunction in master cylinder pressure sensor or its circuit

  3. When stop light switch off, master cylinder pressure changes by 500 bars (50000 kPa) or more

  • Master cylinder pressure sensor

  • Master cylinder pressure sensor circuit

  • Stop light switch circuit

  • Brake actuator assembly
C1281 Detected only during test mode.

  • Master cylinder pressure sensor

  • Master cylinder pressure sensor circuit

  • Stop light switch circuit

  • Brake actuator assembly

CAUTION / NOTICE / HINT

Note

When replacing the brake actuator, perform zero point calibration Click here.

PROCEDURE


  1. 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.

      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

      		 -

    6. Check that "Stop Light SW" turns ON and OFF when the brake pedal is depressed and released.

      OK
      "Stop Light SW" turns on and off in accordance with the operation of the brake pedal.

    NG

    CHECK STOP LIGHT SWITCH CIRCUIT Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER SENSOR)


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

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Master Cylinder Sensor

      Master cylinder pressure sensor 1 reading:

      min.: 0 V, max.: 5 V

      		 When brake pedal released: 0.3 to 0.9 V -

    3. Check that the master cylinder pressure sensor reading increases when the brake pedal is depressed.

      OK
      The sensor output voltage increases.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

  3. RECONFIRM DTC


    1. Clear the DTC(s) Click here.

    2. Drive the vehicle at a speed of 30 km/h (18 mph) or more and perform a braking test (decelerate the vehicle by depressing the brake pedal).

    3. Check if the same DTC(s) is recorded Click here.

      Result
      Result Proceed to
      DTC C1246 is not output A
      DTC C1246 is output (for LHD) B
      DTC C1246 is output (for RHD) C

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here