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
C1421 Open or Short in Master Cylinder Pressure Sensor

Any of the following is detected:


  1. When the 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.

  2. When the 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.

  3. When the +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.

Master cylinder pressure sensor (brake actuator assembly)
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.

Master cylinder pressure sensor (brake actuator assembly)
C1424 Master Cylinder Pressure Sensor Output Malfunction

Any of the following is detected:


  1. When the 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.

  2. When the 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.

  3. 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).

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

  5. When the 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.

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

Either of the following is detected:


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

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

Master cylinder pressure sensor (brake actuator assembly)
C1449 Master Cylinder Output Value Malfunction Master cylinder pressure sensor invalid condition continues for 0.2 seconds or more. Master cylinder pressure sensor (brake actuator assembly)

Tech Tips

for C1423 and C1424: Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed:


  1. Turn the engine switch on (IG).

  2. Keep the vehicle stationary for 5 seconds or more and depress the brake pedal lightly 2 or 3 times.

  3. Drive the vehicle at the vehicle speed of 50 km/h (31 mph) and depress and hold the brake pedal firmly for approximately 3 seconds.

  4. Repeat the above operation 3 times or more and check that the ABS warning light goes off.

  5. Clear the DTCs.

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

    2. Perform zero point calibration of the yaw rate and acceleration sensor and roll rate and vertical acceleration sensor and store system information.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Test Mode
    3. Perform the sensor check in Test Mode (Signal Check) Procedure.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      Result
      Proceed to
      NEXT

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