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	RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1 Loosen and retighten the air fuel ratio (A/F) sensor 1. Refer to [EXHAUST MANIFOLD AND THREE WAY CATALYST: REMOVAL AND INSTALLATION [QR25DE] ]	GO TO 3.
3	CHECK EXHAUST GAS LEAK Start engine and run it at idle. Listen for an exhaust gas leak before three way catalyst (manifold). Courtesy of SUZUKI OF AMERICA CORP. OK or NG	GO TO 4.	Repair or replace.
4	CHECK FOR INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. OK or NG	GO TO 5.	Repair or replace.
5	CLEAR THE SELF-LEARNING DATA With SDT Start engine and warm it up to normal operating temperature. Select "SELF-LEARNING CONT" in "Utility" mode with SDT. Clear the self-learning control coefficient by touching "Clear" or "START". Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? Without SDT Start engine and warm it up to normal operating temperature. Turn ignition switch OFF. Disconnect mass air flow sensor harness connector. Courtesy of SUZUKI OF AMERICA CORP. 4. Restart engine and let it idle for at least 5 seconds. 5. Stop engine and reconnect mass air flow sensor harness connector. 6. Make sure DTC P0102 is displayed. 7. Erase the DTC memory. Refer to [EMISSION-RELATED DIAGNOSTIC INFORMATION ]. 8. Make sure DTC P0000 is displayed. 9. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? Yes or No	Perform trouble diagnosis for DTC P0171 or P0172. Refer to DTC P0171: Fuel Injection System Function or DTC P0172: Fuel Injection System Function .	GO TO 6.
6	CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect A/F sensor 1 harness connector. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 3. Turn ignition switch ON. 4. Check voltage between A/F sensor 1 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 8.	GO TO 7.
7	DETECT MALFUNCTIONING PART Check the following. Harness connectors E2, F32 IPDM E/R harness connector E119 15A fuse (No. 54) Harness for open or short between A/F sensor 1 and fuse	Repair or replace harness or connectors.
8	CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT Turn ignition switch OFF. Disconnect ECM harness connector. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM . Courtesy of SUZUKI OF AMERICA CORP. Continuity should exist. 4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to WIRING DIAGRAM . Continuity should not exist. 5. Also check harness for short to power. OK or NG	GO TO 9.	Repair open circuit, short to ground or short to power in harness or connectors.
9	CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER Refer to [P0031, P0032 A/F SENSOR 1 HEATER ]. OK or NG	GO TO 10.	GO TO 13.
10	CHECK MASS AIR FLOW SENSOR Refer to [P0101 MAF SENSOR ]. OK or NG	GO TO 11.	Replace mass air flow sensor.
11	CHECK PCV VALVE Refer to [POSITIVE CRANKCASE VENTILATION CIRCUIT CHECK ]. OK or NG	GO TO 12.	Repair or replace PCV valve.
12	CHECK INTERMITTENT INCIDENT Perform [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ] OK or NG	GO TO 13.	Repair or replace.
13	REPLACE AIR FUEL RATIO (A/F) SENSOR 1 Replace air fuel ratio (A/F) sensor 1.	INSPECTION END