DTC B2271: Ignition Hold Monitor 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.

CHECK DTC OUTPUT
1. Delete the DTC. Refer to DTC CHECK / CLEAR .
  HINT:
  
  After all DTCs are cleared, check if the trouble occurs again 6 seconds after the engine switch is turned on (IG).
2. Check for DTCs again.
  OK
  
  No DTC is output.
NG → See step 2

OK → END
INSPECT FUSE (AM2)
1. Remove the AM2 fuse from the engine room J/B.
2. Measure the resistance of the fuse.
  Resistance
  
  Below 1 Ω
NG → REPLACE FUSE

OK: Go to next step

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY)

Disconnect the D44 ECU connector.

Fig 1: Identifying Power Source Control ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Voltage

Terminal No. (Symbol)	Specified Condition
D44-33 (AM1) - Body ground	10 to 14 V
D44-12 (AM2) - Body ground	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → REPLACE POWER SOURCE CONTROL ECU