System Description/Monitoring Procedure

ECM measures the angle speed of the crankshaft based on the pulse signal from the CKP sensor and CMP sensor for each cylinder. If it detects a large change in the angle speed of the crankshaft, it concludes that a misfire has occurred. When the number of cylinders that misfire is counted based on DTC detecting conditions, it determines the cylinder where the misfire occurred and outputs it as DTC.