Inspection Procedure

1. Connect Techstream to the DLC3.
2. Start the engine.
3. Select the Data List mode on Techstream.

   ABS / VSC / TRAC: 

   DATA LIST
   
   

   Tester Display	Measurement Item/Range	Normal Condition
   Master Cylinder Sensor	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 Techstream, changes when the brake pedal is depressed.

   OK: Brake fluid pressure value should change. 

   NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).

NG: Go to step 2 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY 

1. Disconnect the skid control ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S3-27(STP1)-Body ground	Brake pedal depressed	8 to 14 V
   S3-27(STP1)-Body ground	Brake pedal depressed	Below 1 V

   Fig 1: Identifying Skid Control ECU Connector S3 Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).

NG: REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY