Wiring Harness (Open Circuit) - Test
断路是指使电流不流动的电路故障。 断路可能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:
参考关于完整的电气示意图,请参阅所维修机器的电气系统示意图。
测试有无断路。
- 确定可疑电路中的接头和导线编号。 利用机器的电气系统示意图确定这些电路。
- 将钥匙起动开关和断路开关转到 OFF 位置。
- 从配线线束上断开部件和 ECM。
- 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。
- 在其它机器线束接头上,使用万用表测量可疑导线的触点与机架接地之间的电阻。
预期结果:电阻测量值小于 5 欧姆。
正常 - 电阻小于 5 欧姆。 线束电路正常。
停止。
不正常 - 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。
Caterpillar Information System:
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