题目:雪佛兰科鲁兹怠速抖动诊断维修方案目录1.问诊试车...........................................................................................................................11.1车辆信息................................................................................................................11.2故障现象................................................................................................................11.3故障确认................................................................................................................12.节气门构成及故障原因分析...........................................................................................22.1节气门的构成........................................................................................................22.1.1节气门综述.................................................................................................22.1.2节气门的构成.............................................................................................22.2气节门故障原因分析............................................................................................33.诊断流程方案设计及实施...............................................................................................43.1气节门故障诊断流程方案....................................................................................43.2方案的实施............................................................................................................53.3修复方法................................................................................................................83.4修复后验证............................................................................................................9参考文献..............................................................................................................................9雪佛兰科鲁兹怠速抖动诊断维修方案1.问诊试车1.1车辆信息2016年款雪弗兰科鲁兹，排量1.8L；手动档；行驶一年；里程约2.7万km。图1-1雪弗兰科鲁兹1.2故障现象客户报修该车怠速抖动；冷车打火不易着；怠速时转速表指针不稳定。1.3故障确认经检查车辆，点火钥匙置于ON位置，仪表显示发动机故障，启动