Inspection Procedure

HINT:

Read freeze frame data using a Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) 
   1. Connect a Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the tester ON.
   4. Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / Stop Light Switch.
   5. Read the values displayed on the tester.

      Result 

      DATA LIST
      
      

      Item	Measurement Item: Range (display)	Normal Condition
      Stop Light Switch	Stop light switch status: ON or OFF	ON: Brake pedal is depressed OFF: Brake pedal is released

   NG: Go to step 2 

   OK : CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS  )

2. INSPECT STOP LIGHT SWITCH  (See INSPECTION PROCEDURE  )

   NG: REPLACE STOP LIGHT SWITCH  (See REMOVAL )

   OK: Go to next step 

3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the ECM connector.
   2. Turn the ignition switch to ON.
   3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      A21-35 (ST1-) - Body ground	Brake pedal released	11 to 14 V
      	Brake pedal depressed	0 to 3 V
      A21-36 (STP) - Body ground	Brake pedal released	0 to 3 V
      	Brake pedal depressed	11 to 14 V

   4. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 1: Depressing And Releasing Brake Pedal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE ECM  (See REMOVAL  )