VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1421, C1423, C1424, C1449

DTC Code DTC Name
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
C1449 Master Cylinder Output Value Malfunction

DESCRIPTION

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

A01FJ4WE36
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 4.64 and 5.37 V for 0.1 seconds or more.

  2. When the VCM terminal voltage is between 4.64 and 5.37 V, the PMC terminal voltage is not between 0.26 and 4.56 V for 0.1 seconds or more.

 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 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 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, the master cylinder pressure sensor input value is sufficiently large with respect to the master cylinder pressure which is estimated using the vehicle body deceleration speed during braking for 1 second or more 5 times or more during one instance of the engine switch being on (IG) and this happens 8 times consecutively every time the engine switch is turned on (IG).

 Brake actuator assembly (Master cylinder pressure sensor)
C1449 The master cylinder pressure sensor is in an invalid state for 0.2 seconds or more when the voltage at terminal IG1 is 8.4 V or higher. Brake actuator assembly (Master cylinder pressure sensor)

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

PROCEDURE


  1. REPLACE BRAKE ACTUATOR ASSEMBLY


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


    NEXT

    END