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P0300, P0301, P0302, P0303, P0304 MISFIRE EC-669 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O If DTC Confirmation Procedure has been previously conducted, always perform the following procedure Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE-1 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Restart engine and let it idle for about 15 minutes. 4. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to . NO >> GO TO 3. 3. PERFORM DTC CONFIRMATION PROCEDURE-2 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Start engine and drive the vehicle as per the similar conditions to (1st trip) Freeze Frame Data for a certain CAUTION: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when The time to driving varies according to the engine speed in the freeze frame data. 3. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010986362 1. CHECK FOR INTAKE AIR LEAK AND PCV HOSE 1. Start engine and run it at idle speed. 2. Listen for the sound of the intake air leak. 3. Check PCV hose connection. Is intake air leak detected? YES >> Discover air leak location and repair. NO >> GO TO 2. Engine speed Engine speed in the freeze frame data ± 400 rpm Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH) Engine coolant temperature (T) When the freeze frame data shows lower than 70 ° C (158 ° F), T should be lower than 70 ° C (158 ° F). When the freeze frame data shows higher than or equal to 70 ° C (158 ° F), T should be higher than or equal to 70 ° C (158 ° F). Engine speed Time Around 1,000 rpm Approximately 10 minutes Around 2,000 rpm Approximately 5 minutes More than 3,000 rpm Approximately 3.5 minutes |