DTC B2271: Ignition Hold Monitor Malfunction: Procedure

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

   Result	Proceed to
   DTC B2271 output	A
   No DTC output	B

B → See step   4 

A: Go to next step 

1. Remove the AM2 fuse from the engine room relay 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 Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E1, E2 and 2D 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
   E1-6 (AM1) - Body ground	Always	11 to 14 V
   E2-1 (AM2) - Body ground	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2D-62 (GND2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)