维修先彻查

(╯﹏╰）流落街 · 发表于 2012-9-9 17:49:48

一辆雪佛莱子弹头到我厂维修，此车为1993年款鲁米娜LUMINA APV车。该车装备了V6电喷发动机，排量为3．1L。根据驾驶员介绍，此车故障为行驶中方向自动向右跑偏，且跑偏量较大，每向前行驶100m能跑偏5m，而该故障是发生在更换了两个前减振器后产生的。

根据驾驶员提供的情况，我们考虑该车为独立悬挂系统，可能是由于更换减振器造成了定位参数出现偏差而产生跑偏的，于是决定对该呈重新进行定位。

在定位之前，先对该车影响定位的各种参数一一进行了检查。检查轴距也符合标准，轮胎气压、大小一致，拉杆球头及下托臂球头不松旷；检查两边前轮的制动情况，均无卡滞现象。两边车身高度一致。接下来，利用美国战车牌V52四轮定位仪进行工作，定位参数从MHCHELL光盘资料中调出。检测后，发现该车的外倾角参数不正确，两后倾角偏差也较大，但均在允许范围之内。

继续查阅MITCHELL资料，发现该车仅外倾角和前束可以调节，而后倾角是不可调节的。于是，针对正确的参数我们分别对两边的外倾角和前束进行了调整，使两边参数均达到正确值并且偏差不大。试车时，故障仅略有好转，但效果并不明显，车辆仍旧向右跑偏。此时认为是定位偏差造成的，便又做了一次定位，可跑偏现象依旧，而参数并没有发生改变。

此时，定位参数准确而方向依旧跑偏的现象让人不得其解。问题会不会出在两个新装的减振器上呢?于是，拆下减振器进行检查，通过仔细查看，终于发现了问题所在。由于该车的减振器压力轴承与托盘为一体式，而减振器上座与托盘相接合的位置很容易因安装不当而造成偏压，使之未压在轴承上而压在托盘橡胶套上，导致定位参数发生改变，从而使其定位轴线发生偏移。同时也表明两前轮后倾角的较大偏差也是因该原因造成的。为此，对该车的两个前减振器进行重新安装，装复之后，再次进行定位，参数均达到正常，偏差也很小。经试车，故障解决。

通过解决该车故障，我们认识到：有些故障并不一定是定位参数造成的，往往是一些其他问题造成的，如有可能是轮胎的大小不一致的原因，也可能是由于轴距的偏差造成的。而这些情况都不是能用定位仪对定位参数进行调整可以解决的。因此，在定位前对影响定位的各部分进行彻底检查是十分必要的。它也能为难确地判断出故障所在，迅速地解决问题提供很大的帮助。

发动机起动后转向灯工作不正常

一辆三菱帕杰罗(PAJERO)越野车，发动机型号为6G72，装备了多点电子燃油喷射系统及自动变速器。当点火开关为ON挡时，左右转向灯闪烁正常，但若打开转向灯或警告灯，则有时正常有时右侧的转向灯闪烁正常，而左侧转向灯常亮不闪。

根据只要发动机起动故障便立即出现，而当发动机起动后，不开转向灯左侧转向灯常亮的现象，说明左、右转向灯的灯泡、闪光器、转向开关及警告灯开关性能良好。因此，怀疑故障与发电机中性线有关。于是起动发动机，拔下发电机上激磁与中性线的插头，但故障仍然存在，故说明故障与发电机中性线无关。

接着检查底盘线路，断开底盘线路连接器，发动机却立即熄火，但随之故障消失，由此证明故障与底盘线路有关。为此从插头上找出左后转向灯的火线(与后尾灯为同一搭铁线)，并把这根火线从插头上单独抽出后重新插好连接器，起动发动机。此时发动机运转正常，故障消失。由此表明左后转向灯火线与其他火线有连接处。接下来使发动机熄火，拔下底盘线路连接器并拆开地板压条，然后找出底盘线路仔细检查，发现线束在脚踏板拐角处磨损，且正好是左后转向灯火线与另一根火线因磨损而连在了一起。经检查，确定这根火线为燃油泵继电器的输出火线(该车油泵为电动油泵)。在用胶带将线路包扎好并使左转向灯火线复位后，重新插好连接器，起动发动机，故障排除了。

究其原因，是因为虽然转向灯线路与火线连接，但不起动时，这根线不能从油泵继电器得到输出电压，而起动后正好有电压信号输出，所以出现上述故障。

incyusam · 发表于 2012-9-23 05:21:37

我只是路过，不发表意见

补水保湿哪个牌子好

lin0r2ql5z · 发表于 2012-9-16 03:42:46

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