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

DTC Code DTC Name
C1421 Open or Short in Master Cylinder Pressure Sensor
C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)
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.

A005K25E09
DTC NO. 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)
C1281 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.

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)


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

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