DTC B2273: Ignition 2 Monitor Malfunction: Procedure

1. Use the Data List to check if the integration relay (IG2 relay) is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG2 Relay Monitor(Inside)	Integration relay (IG2 relay) inner relay monitor/ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-

   OK

   When the engine switch is turned on (IG), ON is displayed on the Techstream.

NG → See step   3 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG), wait at least 10 seconds, and check whether DTC B2273 is output.
   RESULT
   
   

   Result	Proceed to
   No DTC output	A
   DTC B2273 output	B

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

A → See step   6 

1. Remove the IG2 MAIN fuse from the integration relay.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   IG2 MAIN fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

Fig 1: Identifying Integration Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Install the IG2 MAIN fuse to the integration relay.
2. Remove the integration relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1B-8 - 1C-1	Battery voltage applied to terminals 1B-6 and 1B-7	Below 1 Ω
   1B-8 - 1C-1	Battery voltage not applied to terminals 1B-6 and 1B-7	10 kΩ or higher

NG → REPLACE INTEGRATION NO. 1 RELAY 

OK: Go to next step 

Fig 2: Identifying Integration Relay Connector And Main Body ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E2 main body ECU connector.
2. Disconnect the 1B integration relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E2-11 (IG2D) - 1B-6	Always	Below 1 Ω
   1B-7 - Body ground	Always	Below 1 Ω
   E2-11 (IG2D) or 1B-6 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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