摘要本文首先队上海大众朗逸2.0L自动品悠版轿车的无法启动故障实例的整个维修过程加深我们对这项故障操作技能的掌握，最后通过对汽车发动机无法启动故障维修案例的分析更进一步的加深了我们对汽车发动机此种故障的理解，使得我们今后在处理类似故障的时候就显得游刃有余了；同时通过对汽车发动机各方面的理解，也使得我们对汽车有了一个更加全面的理解。然后对汽车喷油器以及燃油泵的作用、构造、分类及工作原理一些最基本的常识进行详细讲解；在自己足够了解这些基础知识后才能使我们迈向更为复杂的燃油供给系统的知识。最后在了解基础知识后我们进一步对汽车喷油器以及燃油泵的故障进行进一步了解，比如汽车的喷油器针阀卡滞，喷油器阻塞，喷油器泄露故障现象、故障原因；然后根据这些理论得出一些属于自己的心得体会，比如一般汽车燃油供给系统故障维修思路步骤等等。2AbstractInthispaper,firstofall,thewholemaintenanceprocessoftheShanghaiVolkswagenLongyi2.0Lautoversioncarwhichcannotstartthefailureinstancedeepensourgraspoftheoperationskillofthefailure.Finally,throughtheanalysisoftheautomobileenginefailureandmaintenancecase,wefurtherdeepenourunderstandingofthiskindoffault,sothatwewillbeabletodealwithsimilarfaultsinthefuture.Atthesametime,throughtheunderstandingofvariousaspectsofautomobileengine,wealsohaveamorecomprehensiveunderstandingofthecar.Thenwewillgiveadetailedexplanationofthefunctions,structure,classificationandworkingprinciplesofautomotivefuelinjectorsandfuelpumps.Ifweknowenoughaboutthesebasicknowledge,wecanmakeusmovetowardsamorecomplexknowledgeoffuelsupplysystem.Finally,afterunderstandingthebasicknowledge,wefurtherunderstandthecarinjectorandfuelpumpfault,suchastheinjectorneedlevalvestuck,injectorblock,injectorleakagefaultphenomenon,faultcauses;Then,accordingtothesetheories,someexperiencesbelongtooneself,suchasthetrainofthoughtstepsofmaintenanceofthegeneralautomobilefuelsupplysystemandsoon.3目录1大众朗逸故障诊断与排除........................................41.1预约与准备工作..............................................41.1.1工作任务描述..........................................41.1.2预约..................................................41.1.3准备工作..............................................51.2接车与制单..................................................61.2.1接车..................................................61.2.2制单..................................................71.3故障分析与诊断流程..........................................101.3.1故障原因分析..............