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Home >> Lexus >> 2006 >> RX 330 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Brakes - Abs With EBD & BD & TRAC & VSC (Diagnostics)) >> DTC C1246/46 Malfunction In Master Cylinder Pressure Sensor >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Communication Diagram Between Master Cylinder Pressure Sensor & Skid Control ECU
G04335979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DIAGNOSTIC TROUBLE CODE TABLE

DTC No. DTC Detection Condition Trouble Area
C1246/46 When any of the following conditions is detected:
  1. Both of the following conditions continue for at least 30 seconds.
    • Vehicle speed is more than 4 mph (7 km/h).
    • PMC terminal voltage does not change by more than 0.005 V once it exceeds 0.86 V.
  2. PMC terminal receives interference at least 7 times within 5 sec.
  3. Both of the following conditions continue for at least 1.2 seconds.
    • Stop light switch is OFF.
    • PMC terminal voltage is more than 0.86 V or less than 0.3 V.
  4. Both of the following conditions continue for at least 1.2 sec.
    • IG1 terminal voltage is between 9.5 and 17 V.
    • VCM terminal voltage is not between 4.4 and 5.6 V.
  5. Both of the following conditions continue for at least 1.2 sec.
    • VCM terminal voltage is between 4.4 and 5.6 V.
    • PMC terminal voltage is not between 0.14 and 4.85 V.
  • Master cylinder pressure sensor
  • Master cylinder pressure sensor circuit
  • Stop light switch circuit
  • Master cylinder solenoid