VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1281,C1421,C1423 and C1424

DTC Code DTC Name
C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)
C1421 Open or Short in Master Cylinder Pressure Sensor
C1423 Master Cylinder Pressure Sensor Zero Point Low Malfunction
C1424 Master Cylinder Pressure Sensor Output Malfunction

DESCRIPTION

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

C234442E06

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1281

Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)

Detected only during Test Mode.

Brake actuator assembly (Master cylinder pressure sensor)

C1421

Open or Short in Master Cylinder Pressure Sensor

Either of the following is detected:

  1. With the IG1 terminal voltage between 9.5 and 17.4 V, the VCM terminal voltage is not between 4.4 and 5.6 V for 1.2 seconds or more.

  2. When the VCM terminal voltage is between 4.8 and 5.2 V, the PMC terminal voltage is not between 0.19 and 4.57 V for 1.2 seconds or more.

Brake actuator assembly (Master cylinder pressure sensor)

C1423

Master Cylinder Pressure Sensor Zero Point Low Malfunction

The PMC terminal voltage is less than 0.27 V for 5 seconds or more.

Brake actuator assembly (Master cylinder pressure sensor)

C1424

Master Cylinder Pressure Sensor Output Malfunction

Any of the following is detected:

  1. Noise occurs in the PMC terminal 7 times or more within 5 seconds.

  2. When the vehicle speed drops from 40 km/h (25 mph) to 10 km/h (6 mph), the master cylinder pressure does not change by at least 0.048 MPa.

  3. At a vehicle speed of 7 km/h (4.3 mph) or more, the PMC terminal voltage is between 0.86 and 1.0 V and does not change by at least 0.048 MPa for 60 seconds or more.

  4. At a vehicle speed of 7 km/h (4.3 mph) or more, the PMC terminal voltage is 1.0 V or more and does not change by at least 0.048 MPa for 30 seconds or more.

  5. At a vehicle speed of 7 km/h (4.3 mph) or more with the stop switch ON, a state in which the pressure sensor input value is sufficiently greater than the estimated master pressure continues for 1 second or more and this state occurs 5 or more times each time the ignition switch is turned to ON, and this occurs 8 or more times consecutively.

Brake actuator assembly (Master cylinder pressure sensor)

WIRING DIAGRAM

Refer to DTC C1425.

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CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

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PROCEDURE

  1. REPLACE BRAKE ACTUATOR ASSEMBLY

    1. Replace the brake actuator assembly (master cylinder pressure sensor).

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      Result

      Proceed to

      NEXT
    NEXT

    END