DTC B2273 Ignition 2 Monitor Malfunction: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Wiring Diagram - Ignition 2 Monitor Malfunction

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT RELAY (Marking: IG2)

Remove the IG2 relay from the engine room R/B No. 2.

Measure the resistance of the relay.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

Fig 2: Inspecting Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE RELAY

OK : GO TO NEXT STEP

CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 - POWER SOURCE CONTROL ECU)

Disconnect the J55 ECU connector.

Fig 3: Identifying Power Source Control J55 ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection (Symbols)	Specified Condition
Engine room R/B No. 2 IG2 relay terminal 2 - J55-35 (IG2D)	Below 1 Ω
Engine room R/B No. 2 IG2 relay terminal 1 - Body ground	Below 1 Ω
Engine room R/B No. 2 IG2 relay terminal 2 orJ55-35 (IG2D) - Body ground	10 kΩ or higher

Result

Result Proceed to

RESULT CHART

Result	Result Proceed to
NG	A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)	B
OK (When troubleshooting according to the DTC chart)	C

B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C : REPLACE POWER SOURCE CONTROL ECU

A : REPAIR OR REPLACE HARNESS OR CONNECTOR