行驶里程约17.5万km的雪铁龙富康两厢轿车。该车在热车时可勉强启动,冷车时则不能启动,只能通过推车才能起动发动机。
故障检修:
(1)故障原因分析
热车可以勉强起动,冷车时起动机转速低或不能转动,起动机已损坏的可能性较小,最有可能的是蓄电池亏电或有极板硫化、活性物质脱落等故障,或是起动电源线路连接处接触不良。
(2)故障检修方法
检查蓄电池极桩与线夹连接、起动机电源接线柱连接均无问题,但发现蓄电池没有固定,询问车主蓄电池为什么没有固定,车主说上次更换蓄电池后就一直没有打开过发动机盖,自己也不知道蓄电池没有固定。维修人员提出要更换蓄电池,车主则认为该蓄电池换上去还不到半年,蓄电池可能只是亏电,对其补充充电后应该还可以使用。后对蓄电池进行了补充充电,并将蓄电池安装牢固后,顺利起动发动机,将车开走。但第三天难以起动的故障又出现了,对蓄电池再进行补充充电,但与前一次一样,电充不进去(电压应在很短的时间就充上来),这说明蓄电池已经损坏。
(3)故障处理措施
车主将车开到服务站,更换了蓄电池后故障排除。
故障分析:故障维修人员提出更换蓄电池是对的,因为该蓄电池没有固定,汽车在行驶中颠簸振动引起蓄电池的冲击振动,很容易使极板上的活性物质脱落、隔板受损,甚至导致蓄电池极板短路。
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