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

1. READ VALUE USING TECHSTREAM (STP SIGNAL AND ST1- VOLTAGE) 
   1. Connect the Techstream to the DLC3
   2. Turn the engine switch on (IG) and turn the Techstream ON.
   3. Enter the following menus. Powertrain / Engine / Data List / Stop Light Switch
   4. Check the STP signal when the brake pedal is depressed and released

      Standard 

      BRAKE PEDAL OPERATION CHART
      
      

      Brake Pedal Operation	Specified Condition
      Depressed	STP signal ON
      Released	STP signal OFF

   5. Measure the voltage according to the value(s) in the table below

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      A5-12 (ST1-) - E6-1 (E1)	Brake pedal depressed	Below 1.5 V
      	Brake pedal released	7.5 to 14 V

   Fig 1: Checking Brake Pedal And ECM Connector Terminal E6 With A5
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 2 

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

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

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      A22-2 - Body ground	Always	11 to 14 V
      A22-3 - Body ground	Engine switch on (IG)	11 to 14 V

   3. Reconnect the stop light switch connector.
   Fig 2: Identifying Stop Light Switch Connector A22
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step  5

   OK: Go to next step 

3. INSPECT STOP LIGHT SWITCH ASSEMBLY 
   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
      
      

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

   3. Reinstall the stop light switch assembly
   Fig 3: Inspecting Stop Light Switch Assembly
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY  (See REMOVAL )

   OK: Go to next step 

4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the stop light switch connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      A22-1 - A5-13 (STP)	Always	Below 1 Ω
      A22-3 - A5-12 (ST1-)	Always

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      A22-1 or A5-13 (STP) - Body ground	Always	10 kΩ or higher
      A22-3 or A5-12 (ST1-) - Body ground	Always

   4. Reconnect the stop light switch connector and ECM connector.
   Fig 4: Identifying Stop Light Switch Connector A22 And ECM Connector A5
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM) 

   OK: REPLACE ECM  (See REMOVAL )

5. INSPECT FUSE (STOP SW AND IGN FUSE) 
   1. Remove the STOP SW fuse and IGN fuse from the cowl side junction block RH.
   2. Measure the resistance according to the value(s) in the table below

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

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

   3. Reinstall the STOP SW fuse and IGN fuse.
   Fig 5: Identifying STOP SW Fuse And IGN Fuse
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE FUSE (STOP SW AND IGN FUSE) 

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH POWER SOURCE)  (See REMOVAL )