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sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted as when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire rate exceeds the threshold level, the ECM illuminates the MIL and stores a DTC. DTC NO. DTC DETECTION CONDITION TROUBLE AREA P0300 logic): Misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately). Catalyst deterioration misfire occurs (MIL illuminates). Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector Fuel pressure Mass Air Flow (MAF) meter Engine Coolant Temperature (ECT) sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Air induction system ECM Fuel pressure switching valve Fuel pressure regulator Fuel pressure regulator for high pressure P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 Misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately). Catalyst deterioration misfire occurs (MIL illuminates). When multiple DTCs for misfiring cylinders are set, but DTC P0300 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only stored when several misfiring cylinders are detected at the same time. MONITOR DESCRIPTION An excessive misfiring rate (approximately 10 to 50 misfires per 1000 crankshaft revolutions) the following conditions, which could cause the Three-Way Catalytic Converter (TWC) damage, is detected: At a high engine speed, a catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs once. At a normal engine speed, a catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs 3 times. HINT: If a catalyst damage misfire occurs, the ECM informs the driver by flashing the MIL. 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P030... |