DTC B2286: Runnable Signal Malfunction: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for CAN communication system. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

   HINT: 

   If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first.

   OK

   DTC is not output.

NG → See step   4 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Check the Data List for proper functioning of the engine.

   HINT: 

   When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts.

   MAIN BODY
   
   

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

NG → See step   3 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

1. Disconnect the A50 ECM connector.
   Fig 1: Identifying A50 Harness And E52 Connector (Main Body ECU (Instrument Panel Junction Block) - ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E52 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E52-2 (TACH) - A50-15 (TACH)	Always	Below 1 Ω
   E52-2 (TACH) or A50-15 (TACH) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)