Product Link 151/201 Caterpillar


Wiring Harness (Open Circuit) - Test

Usage:

631E 1AB
断路是指使电流不流动的电路故障。 断路通常是由电气导线故障或电气接头连接不良引起的。 电气导线或连接断开时,电路中的电流就会中断流动。 常闭电路的电阻值应小于 5 欧姆。 下述步骤将说明断路测试:

参考有关完整的电气示意图,请参阅正在维修的机器的电气系统示意图。

测试有无断路。

  1. 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。

  1. 将钥匙起动开关和断路开关转到断开位置。

  1. 从配线线束上断开部件和 ECM。

  1. 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。

  1. 在其它机器线束接头上,使用万用表表笔测量可疑导线的触点与机架接地之间的电阻。

    预期结果:电阻小于 5 欧姆。

    正常 - 电阻小于 5 欧姆。 线束电路正常。

    停止。

    异常 - 电阻大于 5000 欧姆。 机器线束中存在断路。

    修理:修理或更换机器线束。

    停止。

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