Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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. CHECK OPERATION OF STOP LIGHT 
   1. Check if the stop lights turn on and off normally when the brake pedal is depressed and released.

      OK: Stop light turns ON when brake pedal is depressed. 

   NG: REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 

   OK: GO TO NEXT STEP 

2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
   1. Remove the stop light switch assembly.
   2. Measure the resistance of the stop light switch assembly.

      Standard resistance 

      STOP LIGHT SWITCH ASSEMBLY
      
      

      Switch Condition	Tester Connection	Specified Condition
      Switch pin not pushed	1 - 2	Below 1 Ω
      Switch pin not pushed	3 - 4	10 kΩ or higher
      Switch pin pushed	1 - 2	10 kΩ or higher
      Switch pin pushed	3 - 4	Below 1 Ω

      Fig 1: Inspecting Stop Light Switch Assembly

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

   OK: GO TO NEXT STEP 

3. READ VALUE OF INTELLIGENT TESTER (STP SIGNAL AND ST1- VOLTAGE) 
   1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
   2. Turn the ignition switch ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STOP LIGHT SW.
   4. Confirm the stop light switch status when the brake pedal is depressed and released.

      OK 

      STP SIGNAL AND ST1- VOLTAGE (1 OF 2)
      
      

      Brake Pedal Condition	Specified Condition
      Depressed	STP Signal ON
      Released	STP Signal OFF

   5. Measure the voltage of the ECM when the brake pedal is depressed and released.

      Standard voltage 

      STP SIGNAL AND ST1- VOLTAGE (2 OF 2)
      
      

      Tester Connection	Brake Pedal Condition	Specified Condition
      E9-16 (ST1-) - E7-1 (E1)	Depressed	Below 1.5 V
      E9-16 (ST1-) - E7-1 (E1)	Released	7.5 to 14 V

      Fig 2: Reading Value Of Intelligen Tester (STP Signal And ST1 - Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NG: GO TO NEXT STEP 

4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM