DTC B2286: Runnable Signal Malfunction: Procedure

1. Use the Data List to check if the hybrid control system start request signal is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Ready Signal	Hybrid control system start request signal monitor/ON, OFF or Unknown	ON: System is ON (READY) OFF: System is OFF Unknown: System is Unknown	Power switch pressed and held with shift lever in P

   RESULT
   
   

   Result	Proceed to
   Display on the Techstream screen does not change according to power switch condition	A
   Display on the Techstream screen changes according to power switch condition	B

B → REPLACE MAIN BODY ECU 

A: Go to next step 

Fig 1: Identifying L11 Main Body ECU And A76 Hybrid Vehicle Control ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L11 main body ECU connector.
2. Disconnect the A76 hybrid vehicle control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L11-8 (RDY) - A76-29 (RDY)	Always	Below 1 Ω
   L11-8 (RDY) or A76-29 (RDY) - 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 whether DTC B2286 recurs.

   OK

   No DTC is output.

NG → See step   4 

OK → END (MAIN BODY ECU IS FAULTY)