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DTC C1246/46 Master Cylinder Pressure Sensor Malfunction: Description

The master cylinder pressure sensor is connected to the skid control ECU in the master cylinder solenoid.

Fig 1: Master Cylinder Pressure Sensor Malfunction Diagram
G05629888Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC DETECTION CONDITION AND TROUBLE AREA

DTC Code DTC Detection Condition Trouble Area
C1246/46 When any of the following conditions is detected:
  1. All of the following conditions continue for at least 30 seconds.
    • The vehicle speed is more than 7 km/h (4 mph).
    • The PM/C1 terminal voltage exceeds 0.86 V.
    • The master cylinder pressure does not change by more than 0.048 MPa (0.5 kgf/cm2 , 7.0 psi).
  2. The PM/C1 terminal receives interference at least 7 times within 5 seconds.
  3. Both of the following conditions continue for at least 1.2 seconds.
    • The stop light switch is off.
    • The PM/C1 terminal voltage is higher than 0.86 V or below 0.3 V.
  4. Both of the following conditions continue for at least 1.2 seconds.
  • The VM/C1 terminal voltage is between 4.4 and 5.6 V.
  • The PM/C1 terminal voltage is not between 0.19 and 4.57 V.
  • Master cylinder pressure sensor
  • Stop light switch
  • Harness or connector
  • Master cylinder solenoid