349F and 352F Excavator Machine System Caterpillar


Wiring Harness (Open Circuit) - Test

Usage:

352F-VG A9J
开路是导致电路中没有电流的故障根源。 开路可能是由电路内导线断开导致。 大多数情况下,开路都是由不良连接引起。 开路也可能是由电路中使用的某个电气接头中存在连接故障导致。

以下步骤是一种检查电路中有无开路或不良连接的方法。

测试有无开路

表 1
故障诊断与排除测试步骤  数值  结果 
1. 确定开路

A. 确定可疑电路中的接头和导线编号。 使用机器的电气系统示意图检查电路。

B. 将钥匙起动开关和断路开关转到断开位置。

C. 从配线线束上断开部件和 ECM。

D. 在一个断开的线束连接上,将一根跨接导线连在可疑导线的触点与机架接地之间。

E. 在机器线束的其他接头上,使用万用表表笔测量电阻。 测量可疑导线触点与机架接地之间的电阻。 

电阻小于 5 Ω。 
正常 - 线束电路正常。

停止。

不正常 - 电阻大于 5K Ω。 机器线束中存在断路。

修理:修理或更换机器线束。

注:电阻大于 5 Ω 但小于 5K Ω 表示电路中的连接松动或腐蚀。 电阻测量值大于 5K Ω 表示电路中存在开路。

停止。 

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