Procedure For Malfunction A

DIAGNOSIS PROCEDURE CHART

Step	Action	YES	NO
1	CHECK GROUND CONNECTIONS Turn ignition switch OFF. Loosen and retighten three 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 CONNECTOR FOR WATER Disconnect heated oxygen sensor 2 harness connector. Check that water is not inside connectors. OK or NG	GO TO 3.	Repair or replace harness or connectors.
3	CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT Disconnect heated oxygen sensor 2 harness connector. Courtesy of SUZUKI OF AMERICA CORP. 2. Disconnect ECM harness connector. 3. Check harness continuity between HO2S2 terminal 4 and ECM terminal 78. Refer to WIRING DIAGRAM . Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG	GO TO 4.	Repair open circuit, short to ground or short to ground or short to power in harness or connectors.
4	CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to WIRING DIAGRAM . Continuity should exist. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground. Refer to WIRING DIAGRAM . Continuity should not exist. Also check harness for 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 Refer to [P0138 HO2S2 ]. OK or NG	GO TO 6.	Replace heated oxygen sensor 2. Refer to EXHAUST SYSTEM: EXPLODED VIEW .
6	CHECK INTERMITTENT INCIDENT Refer to [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ]	INSPECTION END