Inspection Procedure

1. Delete the DTCs (See DTC CHECK / CLEAR  ).
2. Check for DTC B2287 (LIN communication master malfunction) and B2785 (Communication malfunction between ECUs connected by LIN).

   Result 

   RESULT CHART
   
   

   Display (DTC output)	Proceed to
   "DTC B2287" only	A
   "DTC B2287" and "DTC B2785"	B
   No DTC	C

   HINT:

   If DTC B2785 is output, perform troubleshooting for DTC B2785 first (See DTC B2785 ).

B:  GO TO DTC B2785 .

C: CHECK INTERMITTENT PROBLEMS 

A: Go to Next Step 

1. Disconnect the E13 and DR ECU connectors.
   Fig 1: Identifying Main Body ECU And E13 Certification ECU Connectors

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   DR-9 (LIN1) - E13-10 (LIN)	Always	Below 1 Ω
   DR-9 (LIN1) or E13-10 (LIN) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. After replacing the main body ECU with a normally functioning ECU, check that the engine starts.

   OK: Engine can start normally. 

NG: REPLACE CERTIFICATION ECU 

OK: END (MAIN BODY ECU DEFECTIVE)