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Home >> Lexus >> 2004 >> GX 470 >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1246/46: Master Cylinder Pressure Sensor Circuit >> Circuit Description

Circuit Description

DIAGNOSTIC TROUBLE CODE

DTC No. DTC Detecting Condition Trouble Area
C1246/46 Either of the following 1., 2., 3., 4. or 5. is detected:
  1. At the vehicle speed of 7 km/h (4 mph) or more, ECU terminal PMC voltage becomes more than 0.86 V and the condition that 0.01 V or less does not change continues for 30 sec.
  2. Interference occurs to ECU terminal PMC 7 times or more for 5 sec.
  3. ECU terminal STP is OFF, and the condition that terminal PMC voltage becomes more than 0.86 V or less than 0.3 V continues for 5 sec. or more.
  4. The condition that ECU terminal IG1 voltage is 9.5 V to 17.0 V, and terminal VCM voltage other than the range from 4.4 V to 5.6 V continues for 1.2 sec. or more.
  5. The condition that ECU terminal VCM voltage is 4.4 V to 5.6 V, and terminal PMC voltage other than the range from 0.14 V to 4.85 V continues for 1.2 sec. or more.
  6. While stopping the vehicle by STP ON, more than 0.3 V difference occurs in the ECU self check.
  • Master cylinder pressure sensor
  • Master cylinder pressure sensor circuit