69D, 769D, 773D, 773E, 776D and 777D Off-Highway Trucks and 771D, 775D and 775E Quarry Trucks Power Train Electronic Control System Caterpillar


General Information

Usage:

769D 5SS


可以通过下面所列的任何维修工具访问系统 ECM 的诊断功能。

  • 关键信息管理系统(VIMS)

  • 卡特彼勒监控系统

  • 卡特彼勒电子技师(ET)

  • 电子控制分析编程器(ECAP)

对系统进行故障诊断和排除需要参阅机器维修手册中的其他信息。 可能需要参阅的其他手册包括当前维修的机器的电气系统示意图、零件手册和操作和保养手册。

本手册结尾部分列出了一个简要系统示意图以供参考。 有关当前诊断的机器的准确示意图,请参考当前所维修机器的维修手册中的电气系统示意图。

当故障诊断和排除操作程序指示需要"修理线束"时,请使用当前维修的机器的电气系统示意图来查探电路。 对线束接头进行导通性检查,确定线束故障位置。 务必检查部件接头上的接地电路。 在任何系统接地点与机架接地点之间,电阻必须小于 5 欧姆。 存在超过 5 欧姆的过大接地电阻会导致故障诊断发生错误。

在故障诊断和排除过程中,更换任何部件之前应先检查所有连接。 如果这些连接上出现脏污或者连接不牢固,则可能会导致永久性电气故障或间歇性电气故障。 检查并确认已将导线完全推入接头中。 在进行其他测试前,确保所有连接牢固。

如果故障诊断和排除过程中弄破了导线绝缘层,则应对损坏的导线进行修补。 使用 8T-0065 RTV 硅酮密封胶 密封损坏的导线部分。 然后,在密封胶上覆盖两层 1P-0810 胶带 。

某个电气部件出现故障可能会导致其他部件也出现故障。 同样,某个电气部件的故障也可能是由其他部件的故障引起的。 在决定更换某个部件之前,一定要先尝试排除电气系统故障。

在从任何 ECM 上拆卸机器线束时,需使用线束接头中央的单个螺钉。

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