Inspection Procedure

HINT:

Read freeze frame data using a Techstream. Freeze frame data record 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.

      Standard 

      NORMAL CONDITION CHART
      
      

      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. CHECK STOP LIGHT SWITCH INSTALLATION 
   1. Check the stop light switch installation (See REMOVAL ).

      OK: Stop light switch is installed correctly. 

   NG: SECURELY REINSTALL STOP LIGHT SWITCH  (See REMOVAL )

   OK: Go to Next Step 

3. INSPECT STOP LIGHT SWITCH ASSEMBLY (See  INSPECTION PROCEDURE   ) 

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY  (See REMOVAL )

   OK: Go to Next Step 

4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   Fig 1: Identifying Harness And Connector (Stop Light Switch - ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the A21 ECM connector.
   2. Disconnect the A13 stop light switch connector.
   3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      STP (A21-36) - Stop light switch (A13-1)	Below 1Ω
      ST1- (A21-35) - Stop light switch (A13-4)

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      STP (A21-36) or Stop light switch (A13-1) - Body ground	10 kΩ or higher
      ST1- (A21-35) or Stop light switch (A13-4) - Body ground

   4. Reconnect the ECM connector.
   5. Reconnect the stop light switch connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM (See  REMOVAL   )