C1246 Master Cylinder Pressure Sensor Malfunction

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Diag Code: 46

DESCRIPTION
DTC C1281 can be deleted when the master cylinder pressure sensor sends a master cylinder
pressure signal or the Test Mode ends. DTC C1281 is output only in the Test Mode.

DTC Code Diag Code DTC Detection Condition Trouble Area
C1246

46

When any of the following is detected:
  1. When IG1 terminal voltage is 20 to 32 V, VCM terminal
    voltage is not between 4.3 and 5.8 V for 1.2 seconds or more.
  2. PMC terminal voltage is not between 0.14 and 4.75 V for 1.2 seconds or more.
  3. With the stop light switch off, either of the following continues for 5 seconds or more:
    – Vehicle speed is 10 km/h (6 mph) or more and PMC voltage is 0.86 V or more.
    – PMC voltage is less than 0.3 V.
  4. At a vehicle speed of 7 km/h (4.3 mph) or more, PMC terminal voltage does not change by 0.01 V or more for 30 seconds or more.
  5. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs in PMC terminal voltage at least 7 times for 5 seconds.
• Master cylinder pressure sensor
• Master cylinder pressure sensor circuit
• Stop light switch circuit
• Skid control ECU
C1281

81

Detected only during Test Mode. • Stop light switch
• Master cylinder pressure sensor


WIRING DIAGRAM


INSPECTION PROCEDURE

1.CHECK STOP LIGHT OPERATION

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2.RECONFIRM DTC

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3.INSPECT MASTER CYLINDER PRESSURE SENSOR

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4.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - MASTER CYLINDER PRESSURE SENSOR)

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5.INSPECT SKID CONTROL ECU (SENSOR INPUT)

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6.INSPECT SKID CONTROL ECU (SENSOR OUTPUT)

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7.RECONFIRM DTC

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8.INSPECT SKID CONTROL ECU (STP TERMINAL)

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9.DTC Clear

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