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EC-288 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE YES >> Go to NO >> GO TO 3. 3. PERFORM DTC CONFIRMATION PROCEDURE-II 1. 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. 4. Start engine and drive the vehicle under similar conditions to (1st trip) Freeze Frame Data for a certain time. Refer to the table below. Hold the accelerator pedal as steady as possible. Similar conditions to (1st trip) Freeze Frame Data mean that the following conditions should be satisfied at the same time. CAUTION: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driving. Driving time varies according to the engine speed in the freeze frame data. 5. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010094985 Regarding Wiring Diagram information, refer to . 1. CHECK FOR INTAKE AIR LEAKAGE AND PCV HOSE 1. Start engine and run it at idle speed. 2. Listen for the sound of the intake air leakage. 3. Check PCV hose connection. YES >> Discover air leakage location and repair. NO >> GO TO 2. 2. CHECK FOR EXHAUST SYSTEM CLOGGING Stop engine and visually check exhaust tube, three way catalyst and muffler for dents. YES-1 >> With CONSULT: GO TO 3. YES-2 >> Without CONSULT: GO TO 4. NO >> Repair or replace malfunctioning part. 3. PERFORM POWER BALANCE TEST With CONSULT 1. Start engine. 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) Basic fuel schedule Basic fuel schedule in freeze frame data × (1 ± 0.1) 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 |