Diagnosis Procedure

DIAGNOSIS PROCEDURE CHART

Step	Action	YES	NO
1	CHECK GROUND CONNECTIONS Turn ignition switch OFF. Loosen and retighten two ground screws on the body. Refer to [POWER SUPPLY AND GROUND CIRCUIT CHECK ]. Courtesy of SUZUKI OF AMERICA CORP. OK or NG	GO TO 2.	Repair or replace ground connections.
2	CHECK HO2S2 POWER SUPPLY CIRCUIT Disconnect heated oxygen sensor 2 harness connector. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 2. Turn ignition switch ON. 3. Check voltage between HO2S2 terminal 3 and ground with SDT or tester. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Voltage: Battery voltage OK or NG	GO TO 4.	GO TO 3.
3	DETECT MALFUNCTIONING PART Check the following. Harness connectors E2, F32 IPDM E/R connector E119 15A fuse (No. 54) Harness for open or short between heated oxygen sensor 2 and fuse	Repair open circuit, short to ground or short to power in harness or connectors.
4	CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT Turn ignition switch OFF. Disconnect ECM harness connector. Check harness continuity between ECM terminal 25 and HO2S2 terminal 2. Refer to WIRING DIAGRAM . Continuity should exist. Also check harness for short to ground and short to power. OK or NG	GO TO 5.	Repair open circuit, short to ground or short to power in harness or connectors.
5	CHECK HEATED OXYGEN SENSOR 2 HEATER Refer to [P0037, P0038 HO2S2 HEATER ]. OK or NG	GO TO 6.	Replace heated oxygen sensor 2.
6	CHECK INTERMITTENT INCIDENT Refer to [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ]	INSPECTION END