发动机电控单元(ECU)是整个发动机电控系统的核心部件。检修ECU的难点在于故障部位的准确诊断。由于缺乏相关知识,检修时方法不正确,使得误诊、错诊时有发生,有时还可能导致ECU出现二次损坏。因此,只有掌握了ECU的工作原理和正确的检修方法,才能安全、快速、准确地检修 Engine Electronic Control Unit (ECU) is the core of the entire engine control system. The difficulty of overhauling the ECU lies in the accurate diagnosis of the fault site. Due to the lack of relevant knowledge, the method of repair is not correct, making misdiagnosis, misdiagnosis have occurred, and sometimes may result in ECU secondary damage. Therefore, only by mastering the working principle of the ECU and the correct method of maintenance can be safely, quickly and accurately overhaul