The automobile ignition coil is mainly composed of a primary coil, a secondary coil, and a core. In the ignition system, the ignition coil is used to convert the low voltage electricity into a high voltage, so that the spark plug generates an electric spark. In general, the engine ignition system has a higher failure rate. Due to the particularity of the structure of the ignition coil, it is not intuitive after the failure, and because of the variety of engine brands, the difference in the performance of the ignition coil often brings certain difficulties to the troubleshooting work.