DTC    C1421    Open or Short in Master Cylinder Pressure Sensor

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

DTC    C1423    Master Cylinder Pressure Sensor Zero Point Low Malfunction

DTC    C1424    Master Cylinder Pressure Sensor Output Malfunction

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DESCRIPTION

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

C106656E06


DTC Code
DTC Detection Condition
Trouble Area
C1421
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)
C1421
Detected only during Test Mode.
Brake actuator assembly (Master cylinder pressure sensor)
C1423
The PMC terminal voltage is less than 0.27 V for 5 seconds or more.
Brake actuator assembly (Master cylinder pressure sensor)
C1424
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 of 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 (Click here).

INSPECTION PROCEDURE

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

1.REPLACE BRAKE ACTUATOR ASSEMBLY
  1. Replace the brake actuator assembly (master cylinder pressure sensor) (Click here).


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