Inspection Procedure

HINT:

Start the inspection from step  1 when using the hand-held tester and start from step  3 when not using the hand-held tester.

1. Check output value of the master cylinder pressure sensor. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Select DATA LIST mode on the hand-held tester.
   Fig 1: Data List Mode Reference Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   CHECK: 

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

   RESULT: 

   RESULT
   
   

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

   1. B: Go to step   3 . 
   2. C : Replace master cylinder solenoid (See  DISASSEMBLY  ). 
   3. A: Go to next step. 
2. Reconfirm DTC (See  DTC CHECK / CLEAR   ). 

   PREPARATION: 

   Clear the DTC.

   CHECK: 

   Check if the same DTC is detected.

   RESULT: 

   DTC OUTPUT RESULT
   
   

   DTC is output	A
   DTC is not output	B

   1. B: END. 
   2. A: Replace master cylinder solenoid (See  DISASSEMBLY  ). 
3. Check brake pedal and stop light switch installation (See  BRAKE PEDAL  ). 

   CHECK: 

   1. Check brake pedal height.
   2. Check stop light switch installation.

   OK: 

   The brake pedal and stop light switch are normal. 

   1. NG: Adjust brake pedal and/or stop light switch (See  BRAKE PEDAL  ). 
   2. OK: Go to next step. 
4. Measure the voltage of the master cylinder solenoid (skid control ECU STP terminal). 

   PREPARATION: 

   Disconnect the skid control ECU connector S29.

   CHECK: 

   Measure the voltage according to the value(s) in the table below.

   Fig 2: Identifying Terminal STP Of Skid Control ECU Connector S29

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   SKID CONTROL ECU CONNECTOR S29 TERMINALS VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   S29-7 (STP) - Body ground	Brake pedal depressed	8 to 14V
   S29-7 (STP) - Body ground	Brake pedal released	Below 1.5V

   1. NG: Check and replace harness and connector (STP circuit). 
   2. OK: Go to next step. 
5. Reconfirm DTC (See  DTC CHECK / CLEAR   ). 

   PREPARATION: 

   Clear the DTC.

   CHECK: 

   Check if the same DTC is detected.

   RESULT: 

   DTC OUTPUT RESULT
   
   

   DTC is output	A
   DTC is not output	B

   1. B: END. 
   2. A: Replace master cylinder solenoid (See  DISASSEMBLY  ).