DTC B2286: Runnable Signal Malfunction: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM

Connect Techstream to the DLC3.
Turn the engine switch ON (IG) and press Techstream main switch on.

Read the Data List according to the displays on the tester.

POWER SOURCE CONTROL ECU:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Condition	Engine condition / RUN or STOP	RUN: Engine switch is ON (START) STOP: Engine switch is OFF, ON (IG) or ON (ACC)	-

"RUN" (engine switch is on (START)) appears on the screen.

"STOP" (engine switch is off, on (IG) or on (ACC)) appears on the screen.

NG → See step 2

OK → GO TO SFI SYSTEM SFI SYSTEM

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)

Disconnect the D44 ECU connector.

Fig 1: Identifying D44 ECU Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the A55 ECM connector.

Fig 2: A55 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Resistance

Tester Connection	Specified Condition
D44-2 (TACH) - A55-15 (TACH)	Below 1 Ω
D44-2 (TACH) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK DTC OUTPUT
1. After replacing the power source control ECU with a normally functioning ECU, check for power source control ECU DTCs.
  OK
  
  Power source control ECU DTCs are not output.
NG → GO TO SFI SYSTEM SFI SYSTEM

OK → END (POWER SOURCE CONTROL ECU DEFECTIVE)