Inspection Procedure

HINT:

• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
• STP signal conditions can be checked using the Techstream.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Stop Light Switch.
5. Check the STP signal when the brake pedal is depressed and released.

1. INSPECT STOP LIGHT SWITCH (TERMINAL VOLTAGE) 
   1. Disconnect the stop light switch connector.
   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Switch Condition	Specified Condition
      A1-2 - Body ground	Always	11 to 14 V
      A1-3 - Body ground	Ignition switch ON	11 to 14 V

   3. Reconnect the stop light switch connector.

   NG: Go to step  4

   Fig 1: Identifying Stop Light Switch Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

2. INSPECT STOP LIGHT SWITCH 
   1. Remove the stop light switch.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

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

   3. Reinstall the stop light switch.

   NG: REPLACE STOP LIGHT SWITCH  (See STOP LIGHT SWITCH )

   Fig 2: Inspecting Stop Light Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

3. INSPECT ECM (STP AND ST1- VOLTAGE) 
   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
      A50-35 (ST1-) - Body ground	Brake pedal released	11 to 14 V
      	Brake pedal depressed	0 to 3 V
      A50-36 (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 3: Checking Brake Pedal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM  (See ECM )

4. INSPECT FUSES (STOP AND IGN FUSES) 
   1. Remove the STOP and IGN fuses from the instrument panel junction block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      STOP fuse	Always	Below 1 Ω
      IGN fuse

   3. Reinstall the STOP and IGN fuses.
   Fig 4: Identifying Instrument Panel Junction Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE FUSE (STOP AND/OR IGN FUSE) 

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STOP LIGHT SWITCH)