Inspection Procedure

HINT: Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the hand-held tester.

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.
      DATA LIST
      
      

      Item	Measurement Item/Range (Display)	Normal Condition
      MAS CYL PRS 1	Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V	When brake pedal is released: 0.3 to 0.9 V

   4. Check that the brake fluid pressure value of the master cylinder pressure sensor indicated on the hand-held tester, changes when the brake pedal is depressed.

   OK: Brake fluid pressure value should change. 

   1. NG: Go to step 2 
   2. OK: GO TO NEXT STEP. 

      REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  ) 

2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL) 
   1. Disconnect the skid control ECU connector.
   2. Measure the voltage according to the value (s) in the table below.

      Standard: 

      SKID CONTROL ECU TERMINAL VOLTAGE
      
      

      Tester Connection	Switch condition	Specified Condition
      S1-27(STP)-Body ground	Brake pedal depressed	8 to 14 V
      S1-27(STP)-Body ground	Brake pedal released	Below 1 V

      Fig 1: Identifying Skid Control ECU Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: CHECK AND REPLACE STOP LIGHT SWITCH CIRCUIT 
   2. OK: GO TO NEXT STEP. 

      REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  )