With the increasing levels of car repair, car engine fault detection and diagnosis method is also changing. Because of introducing the self-diagnosis function in modern car computer control system, the fault diagnosis can start directly from the self-diagnostic results and find the failure through check and detection.% 随着汽车维修水平的不断提高，汽车发动机故障检测诊断的方法也出现了新的变化，现代汽车计算机控制系统中由于加入了自诊断功能，故障诊断时可以直接从自诊断结果入手，通过检查检测找出故障点。
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