DTC B2271: Ignition Hold Monitor Malfunction: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check whether DTC B2271 recurs.
   RESULT
   
   

   Display (DTC output)	Proceed to
   B2271	A
   No DTC output	B

B → See step   4 

A: Go to next step 

1. Remove the AM2 fuse from the passenger side junction block.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   AM2 fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

Fig 1: Identifying Main Body ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L13, L12 and DA main body ECU connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   L13-6 (AM1) - Body ground	Always	11 to 14 V
   L12-1 (AM2) - Body ground	Always	11 to 14 V

   Standard resistance

   Tester Connection	Condition	Specified Condition
   DA-40 (GND1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU