Inspection Procedure

1. Use the Data List to check if the engine condition is functioning properly.

   Main Body 

   TESTER DISPLAY REFERENCE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Engine Condition	Engine condition/Run or Stop	Run: Engine running Stop: Engine stopped	-

   OK: When the engine is running, Run is displayed on the Techstream. 

NG: REPLACE MAIN BODY ECU 

OK: Go to Next Step 

Fig 1: Identifying L11 Main Body ECU And A14 ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L11 main body ECU connector.
2. Disconnect the A14 ECM connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   L11-8 (TACH) - A14-15 (TACH)	Always	Below 1 Ω
   L11-8 (TACH) or A14-15 (TACH) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Temporarily replace the main body ECU with a new or normally functioning one.
2. Check that the engine starts normally.

   OK: Engine starts normally. 

NG: GO TO SFI SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: END (MAIN BODY ECU IS FAULTY)