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P0171 FUEL INJECTION SYSTEM FUNCTION EC-653 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O YES >> Proceed to . NO >> Check exhaust and intake air leak visually. 4. PERFORM DTC CONFIRMATION PROCEDURE-2 1. Start engine and let it idle for at least 5 minutes. 2. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to . NO >> GO TO 5. 5. PERFORM DTC CONFIRMATION PROCEDURE-3 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Start engine. 3. Maintain the following conditions for at least 10 consecutive minutes. CAUTION: Always drive vehicle at a safe speed. 4. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010986352 1. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold). Is exhaust gas leak detected? YES >> Repair or replace error-detected parts. NO >> GO TO 2. 2. CHECK FOR INTAKE AIR LEAK 1. Listen for an intake air leak after the mass air flow sensor. 2. Check PCV hose connection. Intake air leak detected? YES >> Repair or replace error-detected parts. NO >> GO TO 3. 3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect corresponding A/F sensor 1 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector. VHCL SPEED SE 50 - 120 km/h (31 - 75 MPH) PBIB1216E |