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Home >> Lexus >> 2004 >> RX 330 FWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1246/46: Malfunction In Master Cylinder Pressure Sensor >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF HAND-HELD TESTER (MASTER CYLINDER PRESSURE SENSOR) 
    1. Connect the hand-held tester to the DLC3.
    2. Start the engine.
    3. Select the DATA LIST mode on the hand-held tester.
    4. Check that the brake fluid pressure value of the master cylinder pressure sensor observed in the hand-held tester changes when the brake pedal is depressed.

    Standard: Brake fluid pressure value should change. 

    NG: Go to step 2 

    OK: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  ) 

  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL) 
  1. Disconnect the skid control ECU connector S1.
  2. Fig 1: Disconnecting Skid Control ECU Connector S1
    G01396058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Measure the voltage according to the value(s) in Fig 2 .

    Standard: 

    Fig 2: Voltage Standard Table (1 Of 2)
    G01396056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Measure the voltage according to the value(s) in Fig 3 .

Standard: 

Fig 3: Voltage Standard Table (2 Of 2)
G01396057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK AND REPLACE STOP LIGHT SWITCH CIRCUIT 

OK: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  )