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P0171 FUEL INJECTION SYSTEM FUNCTION EC-249 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A EC N P O >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE-1 1. Clear the mixture ratio self-learning value. Refer to . 2. Start engine. Is it difficult to start engine? YES >> GO TO 3. NO >> GO TO 4. 3. RESTART ENGINE If it is difficult to start engine, the fuel injection system has a malfunction, too. Does engine start? YES >> Proceed to . NO >> Check exhaust and intake air leakage visually. 4. PERFORM DTC CONFIRMATION PROCEDURE-2 1. Keep engine idle for at least 10 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 and Maintain the following conditions for at least 10 consecutive minutes. Hold the accelera- CAUTION: Always drive vehicle at a safe speed. 3. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to . NO-1 >> To check malfunction symptom before repair: Refer to GI-44, "Intermittent Incident" NO-2 >> Confirmation after repair: INSPECTION END Diagnosis Procedure INFOID:0000000010775158 1. CHECK EXHAUST GAS LEAKAGE 1. Start engine and run it at idle. 2. Listen for an exhaust gas leakage before three way catalyst (manifold). Is exhaust gas leakage detected? Vehicle 50 - 100 km/h (31 - 62 MPH) PBIB1216E |