VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1421, C1423, C1424, C142A, 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
C142A Master Cylinder Pressure Sensor Internal Malfunction
C1449 Master Cylinder Output Value Malfunction

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1421 Open or Short in Master Cylinder Pressure Sensor

Any of the following is detected:


  • When voltage at terminal +BS is 9.5 V or higher, power supply voltage of master cylinder pressure sensor is continuously low for 1 second or more.

  • When master cylinder pressure sensor power supply voltage has risen, master cylinder pressure sensor has overheated or overcurrent of master cylinder pressure sensor continues for 0.1 seconds or more.

  • When +BS terminal voltage is 9.5 to 17.4 V, there is no communication with master cylinder pressure sensor continuously for 0.1 seconds or more.

 Brake actuator assembly (Master cylinder pressure sensor) -
C1423 Master Cylinder Pressure Sensor Zero Point Low Malfunction Master cylinder pressure is below -0.744 MPa (-7.6 kgf/cm2, -107 psi) 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:


  • When vehicle speed is 7 km/h (4.3 mph) or more and master cylinder pressure exceeds 1.764 MPa (18.0 kgf/cm2, 255 psi), master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously for 60 seconds.

  • When vehicle speed is 7 km/h (4.3 mph) and master cylinder pressure is 2.45 MPa (25.0 kgf/ cm2, 355 psi) or more, master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously for 30 seconds.

  • Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more 5 times or more while vehicle speed decreases from 40 km/h (25 mph) to 0 km/h (0 mph).

  • When vehicle speed is 10 km/h (6 mph) or more, noise in master cylinder pressure value occurs 7 times or more in 5 seconds.

  • When vehicle speed is 7 km/h (4.3 mph) or more, braking is performed (stop light switch assembly is ON) and master cylinder pressure differential value is below 20 MPa/s, difference between master cylinder pressure estimated from vehicle deceleration and master cylinder pressure sensor input value is large for 1 second or more 5 times or more.

 Brake actuator assembly (Master cylinder pressure sensor) -
C142A Master Cylinder Pressure Sensor Internal Malfunction

Either of the following is detected:


  • Master cylinder pressure is 23.328 MPa (237.8 kgf/cm2, 3382 psi) or more continuously for 0.1 seconds.

  • Master cylinder temperature is 150°C (302°F) or more continuously for 0.1 seconds.

 Brake actuator assembly (Master cylinder pressure sensor) -
C1449 Master Cylinder Output Value Malfunction Master cylinder pressure sensor invalid condition continues for 0.2 seconds or more. Brake actuator assembly (Master cylinder pressure sensor) -
C1421 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status When voltage at terminal +BS is 9.5 V or higher, power supply voltage of master cylinder pressure sensor is continuously ○ - -
When master cylinder pressure sensor power supply voltage has risen, master cylinder pressure sensor has overheated or overcurrent of master cylinder pressure sensor continues - ○ -
When +BS terminal voltage is 9.5 to 17.4 V, there is no communication with master cylinder pressure sensor continuously - - ○
Detection Time 1 second or more. 0.1 seconds or more. 0.1 seconds or more.
Number of Trips 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

C1424 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition - - - - - -
Malfunction Status When vehicle speed is 7 km/h (4.3 mph) or more and master cylinder pressure exceeds 1.764 MPa (18.0 kgf/cm2, 255 psi), master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously ○ - - - -
When vehicle speed is 7 km/h (4.3 mph) and master cylinder pressure is 2.45 MPa (25.0 kgf/ cm2, 355 psi) or more, master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously - ○ - - -
Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more 5 times or more while vehicle speed decreases from 40 km/h (25 mph) to 0 km/h (0 mph) - - ○ - -
When vehicle speed is 10 km/h (6 mph) or more, noise in master cylinder pressure value occurs 7 times or more in 5 seconds - - - ○ -
When vehicle speed is 7 km/h (4.3 mph) or more, braking is performed (stop light switch assembly is ON) and master cylinder pressure differential value is below 20 MPa/s, difference between master cylinder pressure estimated from vehicle deceleration and master cylinder pressure sensor input value is large for 1 second or more 5 times or more - - - - ○
Detection Time 60 seconds or more. 30 seconds or more. - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

C142A DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status Master cylinder pressure is 23.328 MPa (237.8 kgf/cm2, 3382 psi) or more continuously ○ -
Master cylinder temperature is 150°C (302°F) or more continuouslye - ○
Detection Time 0.1 seconds or more. 0.1 seconds or more.
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. REPLACE BRAKE ACTUATOR ASSEMBLY


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

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

    END