Inspection Procedure

HINT:

When C1249/49 is output together with C1246/46, inspect and repair the trouble areas indicated by C1249/49 first.

1. READ VALUE USING TECHSTREAM (MASTER CYLINDER SENSOR) 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG) and turn the Techstream on.
   3. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

      ABS/VSC/TRAC 

      DATA LIST
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Master Cylinder Sensor	Master cylinder pressure sensor reading/min.: 0 V, max.: 5 V	When brake pedal is released: 0.3 to 0.9 V	The reading increases when the brake pedal is depressed.

   4. Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on the Techstream changes when depressing the brake pedal.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   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 changes normally.	C

   A: REPLACE MASTER CYLINDER SOLENOID  (See INSPECTION )

   C:  Go to step  4

   B: Go to next step 

2. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION 
   1. Check the brake pedal height (See ADJUSTMENT ).
   2. Check the stop light switch installation (See ADJUSTMENT ).

   OK: The brake pedal and stop light switch are normal. 

   NG: ADJUST BRAKE PEDAL AND/OR STOP LIGHT SWITCH  (See ADJUSTMENT )

   OK: Go to next step 

3. INSPECT SKID CONTROL ECU (STP TERMINAL) 
   1. Disconnect the A24 skid control ECU connector.
   2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A24-7 (STP) - Body ground	Stop light switch on (Brake pedal depressed)	8 to 14 V
   A24-7 (STP) - Body ground	Stop light switch off (Brake pedal released)	Below 1.5 V

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 1: Identifying A24 Skid Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

4. RECONFIRM DTC 
   1. Clear the DTC (See DTC CHECK/CLEAR ).
   2. Check if the same DTC is output (See DTC CHECK/CLEAR ).

   HINT:

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

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC is output.	A
   DTC is not output.	B

   B: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )