Inspection Procedure

HINT

Check the connector connection to the terminal to make sure that there is no abnormally such as a loose connection, deformations, etc

1. READ VALUE USING TECHSTREAM 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG)
   3. Check the Data List of proper functioning of the start switch

      HINT

      When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1 5 second intervals or less until communication between the Techstream and vehicle starts

      Power Source Control 

      ITEM RANGE REFERENCE
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Start Switch1	Start Switch 1 / ON or OFF	ON Engine switch is pushed OFF Engine switch is not pushed	-
      Start Switch2	Start Switch 2 / ON or OFF	ON Engine switch is pushed OFF Engine switch is not pushed	-

      OK: ON (engine switch is pushed) and OFF (engine switch is not pushed) appear on the screen. 

   NG: Go to step  3

   OK: Go to next Step 

2. CHECK FOR DTC 
   1. Clear the DTC (See DIAGNOSIS SYSTEM  )
   2. Turn the engine switch on (IG)
   3. Check for DTC

      OK: DTC B2278 is not output. 

   NG: REPLACE POWER SOURCE CONTROL ECU 

   OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

3. INSPECT ENGINE SWITCH 
   1. Remove the engine switch (See REMOVAL )
      Fig 1: Identifying Engine Switch Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Switch Condition	Specified Condition
      7 (SS1) - 5 (GND)	Pushed	Below 1 Ω
      2 (SS2) - 5 (GND)	Pushed	Below 1 Ω
      7 (SS1) - 5 (GND)	Not pushed	10 kΩ or higher
      2 (SS2) - 5 (GND)	Not pushed	10 kΩ or higher

      HINT

      This engine switch is momentary type switch

   NG: REPLACE ENGINE SWITCH  (See REMOVAL )

   OK: Go to next Step 

4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ENGINE SWITCH AND BODY GROUND) 
   1. Disconnect the J55 connector from the power source control ECU
   2. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      J31-7 (SS1) - J55-14 (SSW1)	Always	Below 1 Ω
      J31-2 (SS2) - J55-37 (SSW2)	Always	Below 1 Ω
      J31-5 (GND) - Body ground	Always	Below 1 Ω
      J31-7 (SS1) or J55-14 (SSW1) - Body ground	Always	10 kΩ or higher
      J31-2 (SS2) or J55-37 (SSW2) - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying J31 And J55 Connector Terminal
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - ENGINE SWITCH) 

   OK: REPLACE POWER SOURCE CONTROL ECU