关键词: 电控系统；轿车；曲轴位置传感器；凸轮轴位置传感器；故障；检测方法

Abstract: The continuous updating and iteration of automobile models has brought greater challenges to the automobile maintenance industry, and the automobile engine electronic control system is one of the important parts of the automobile components, and the maintenance of its failure is particularly important. This paper mainly detects and analyzes the fault of the crankshaft and camshaft position sensor of the 2019 Magotan B8L sedan, mainly by using a X431 computer diagnostic instrument to read the fault code, using the FSA740 oscilloscope to read the waveform, and using digital multimeter, and light emitting diode (LED) light to detect the data, so as to accurately determine, investigate and lock the fault point. In this paper, the diagnosis process of the whole testing process is sorted out in detail, which provides basic maintenance ideas for the maintenance industry and teaching in higher vocational colleges.

Key words: Electric control system; Sedan; Crankshaft position sensors; Camshaft position sensors; Fault; Detection method