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. Turn the ignition switch to the ON position and push the hand-held tester main switch ON.
   3. Select "DATA LIST" mode on the hand-held tester.
      ITEM, MEASUREMENT ITEM/RANGE (DISPLAY), NORMAL CONDITION AND DIAGNOSTIC NOTE
      
      

      Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
      MAS CYL PRESS 1	Master cylinder pressure sensor 1 reading/min.: 0 V, max.: 5 V	When brake pedal is released: 0.3 to 0.9 V	Reading increases when brake pedal is depressed
      MAS CYL PRESS 1	Master cylinder pressure sensor 1 reading/min.: 0 V, max.: 5 V	When stop light is turned on: 0.3 to 0.9 V	Reading increases when brake pedal is depressed

   4. Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on the hand-held tester changes when depressing the brake pedal.

      Result: 

      RESULT DESCRIPTION
      
      

      Master cylinder pressure sensor value does not change	A
      Master cylinder pressure sensor value changes but it is not normal	B
      Master cylinder pressure sensor value becomes normal	C

   1. B: Go to step 2 
   2. C: Go to step   4 
   3. A: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 
2. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION (SEE  BRAKE PEDAL SUB-ASSY  ) 
   1. Check the brake pedal height.
   2. Check the stop light switch installation.

      OK: 

      The brake pedal and stop light switch are normal. 

   1. NG: ADJUST BRAKE PEDAL AND/OR STOP LIGHT SWITCH ( BRAKE PEDAL SUB-ASSY  ) 
   2. OK: GO TO NEXT STEP 
3. INSPECT SKID CONTROL ECU (STP TERMINAL VOLTAGE) 
   1. Disconnect the skid control ECU connector.
   2. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION, CONDITION AND SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      S28-7(STP)- Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
      S28-7 (STP) &Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

      Fig 1: Identifying Skid Control ECU STP Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 
   2. OK: GO TO NEXT STEP 
4. RECONFIRM DTC 
   1. Clear the DTC (see DTC CHECK/CLEAR  ).
   2. Check if the same DTC is detected (see DTC CHECK/CLEAR  ).

      HINT:

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

      Results: 

      RESULT DESCRIPTION
      
      

      DTC is output	A
      DTC is not output	B

   1. B: END 
   2. A: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  )