DTC B2271: Ignition Hold Monitor Malfunction: Procedure

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 

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 

1. Disconnect the D44 ECU connector.
   Fig 1: View Of Disconnected D44 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. 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