ANTI-LOCK BRAKE 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 pressure control sensor and master cylinder pressure sensor are connected to the skid control ECU in the master cylinder solenoid.

B001ZZBE05
DTC Code DTC Detection Condition Trouble Area
C1421

Either condition is met:

Both of the following conditions continue for at least 1.2 seconds.


  • The IG1 terminal voltage is between 9.5 V and 17.0 V.

  • The VM/C1 terminal voltage is not within 4.4 V and 5.6 V.

Both of the following conditions continue for at least 1.2 seconds.


  • The VM/C1 terminal voltage is between 4.4 V and 5.6 V.

  • The PM/C1 terminal voltage is not within 0.19 V and 4.57 V.

 Master cylinder solenoid
C1423

Both of the following conditions continue for at least 5 seconds


  • The stop light switch is off.


  • The PM/C1 terminal voltage is below 0.3 V.

 Master cylinder solenoid
C1424

One of the following conditions is met:


  • Noise occurs in the signal from the PM/C1 terminal 7 times or more within 5 seconds.

  • 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.

  • At a vehicle speed of 7 km/h (4 mph) or more, the PM/C1 terminal voltage is between 0.86 and 1.0 V and master cylinder pressure does not change by at least 0.048 MPa for 60 seconds or more.

  • At a vehicle speed of 7 km/h (4 mph) or more, the PM/C1 terminal voltage is 1.0 V or more and master cylinder pressure does not change by at least 0.048 MPa for 30 seconds or more.

  • At a vehicle speed of 7 km/h (4 mph) or more with the stop light switch ON, a state in which the pressure sensor input value is sufficiently higher than the estimated master pressure continues for 1 second or 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.

 Master cylinder solenoid
C1281 Detected only during Test Mode Master cylinder solenoid

CAUTION / NOTICE / HINT

Note

After replacing the master cylinder solenoid, perform zero point calibration Click here.

PROCEDURE


  1. REPLACE MASTER CYLINDER SOLENOID


    1. Replace the master cylinder solenoid (for LHD: See page , for RHD: Click here.


    NEXT

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