Inspection Procedure

1. Check for DTC.

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Proceed to
   DTC B2785 is not output	A
   DTC B2785 is output	B

B:  GO TO DTC B2785

A: Go to Next Step 

1. Disconnect the K73 ECU connector.
2. Disconnect the U28 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   K73-30 (LIN1) - U28-10 (LIN)	Below 1 Ω
   K73-30 (LIN1) or U28-10 (LIN) - Body ground	10 kΩ or higher

Fig 1: Identifying Terminals Of K73 And U28 ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Temporarily replace the certification ECU with a new or normally functioning one.
2. Check for DTCs again.

   OK: No DTC is output. 

NG: REPLACE POWER SOURCE CONTROL ECU 

OK: END (CERTIFICATION ECU IS FAULTY)