Abstract: Taking Magotan B8 engine as an example, this paper introduces the failure cases of engine and failure to start the starter, lists the corresponding fault points according to the engine starting control principle, and explains the troubleshooting methods and diagnostic ideas of different faults in the starting control system combined with the failure cases. In fault diagnosis, the diagnostic idea mainly includes describing the fault phenomenon and characteristics, analyzing the possible causes according to the phenomenon and related fault codes, data measurement and result analysis, and further confirming the fault point and mechanism analysis. In the whole process of fault diagnosis, rigorous diagnostic thinking is particularly important, which is also relatively high requirements for technical personnel, who need to master the control logic of the system. A rigorous train of thought for automobile fault diagnosis is established through fault analysis, which provides a reference train of thought and method for automobile maintenance technicians in automobile fault diagnosis.

Key words: Volkswagen Magotan B8 engine; Starting control system; Troubleshooting; Failure to start; Case analysis

摘要： 文章以迈腾 B8 发动机为例，介绍了发动机无法起动、起动机不运转的故障案例，按照 发动机起动控制原理罗列出相对应的故障点，并结合故障案例说明起动控制系统不同故障的 排除方法及诊断思路。在故障诊断中，诊断思路主要包括描述故障现象及特征，根据现象及 相关故障码分析可能原因，通过数据的测量及结果分析，进一步确认故障点及机理分析。在 整个故障诊断过程中，严谨的诊断思路尤为重要，这对于技术人员的要求也比较高，需要其 掌握系统的控制逻辑。通过故障分析建立严谨的汽车故障诊断思路，为汽车维修技术人员在 汽车故障诊断中提供了可参考的思路和方法。

关键词: 大众迈腾 B8 发动机；起动控制系统；故障排除；无法起动；案例分析