Inspection Procedure

HINT:

Using Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) position.
4. Turn the Techstream on.
5. Select the item "Powertrain / Engine and ECT / Data List".
6. According to the display on the tester, read the "Data List".

   Standard 

   DATA LIST
   
   

   Item	Measurement Item/Range (display)	Normal Condition
   Stop Light Switch	Stop light switch Status/ ON or OFF	Brake Pedal is depressed: ON Brake Pedal is Released: OFF

   NOTE: In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not depend solely on these reference conditions when deciding whether a part is faulty or not.

OK:  Go to step  3

NG: Go to next step 

1. Remove the stop light switch assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Switch position	Tester Connection	Specified Condition
   Switch pin free	1-2	Below 1 Ω
   Switch pin pushed in	↑	10 kΩ or higher
   Switch pin free	3-4	10 kΩ or higher
   Switch pin pushed in	↑	Below 1 Ω

   Fig 1: Identifying Terminals Of Stop Light Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: Go to next step 

1. Install the stop light switch assembly.
2. Disconnect the ECM connector.
3. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.
   Fig 2: Identifying Terminals Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Condition	Tester Connection	Specified Condition
   Brake pedal is depressed	A6-4 (STP) - Body ground	10 to 14 V
   Brake pedal is released	↑	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM