Inspection Procedure

HINT:

When DTC B2287 and B2785 are output simultaneously, perform the troubleshooting for DTC B2785 first (see DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN ).

1. CLEAR DTC 
   1. Clear the DTC (see DTC CHECK / CLEAR ).
2. CHECK FOR DTC 
   1. Recheck for DTC (see DTC CHECK / CLEAR )

   Result: 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC B2287 output reoccurs	A
   DTC B2287 output does not reoccur	B

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

   A: Go to next step 

3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - MAIN BODY ECU) 
   Fig 1: Identifying Certification ECU Connector L15 And Main Body ECU Connector DA

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the L15 and DA ECU connectors.
   2. Measure the resistance and voltage according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   L15-10 (LIN) - DA-52 (LIN1)	Always	Below 1 Ω
   L15-10 (LIN) or DA-52 (LIN1) - Body ground	Always	10 kΩ or higher

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   L15-10 (LIN) or DA-52 (LIN1) - Body ground	Always	Below 1 V

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

4. CHECK MAIN BODY ECU (OPERATION) 
   1. Temporarily replace the main body ECU with a new or normally functioning one
   2. Clear the DTC (see DTC CHECK / CLEAR )
5. CHECK FOR DTC 
   1. Recheck for DTC (see DTC CHECK / CLEAR )

   Result: 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC B2287 output does not reoccur	A
   DTC B2287 output reoccurs	B

   B: REPLACE CERTIFICATION ECU 

   A: END (MAIN BODY ECU IS DEFECTIVE)