Wiring Harness (Open Circuit) - Test
开路是导致电路中没有电流的故障根源。 开路有时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。
应使用以下步骤检查电路中有无开路或不良连接。
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| 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确定接头位置。 B. 将钥匙起动开个和断路开关转到 OFF 位置。 C. 将电路部件（或部件）和 ECM 从配线线束上断开。 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。 止动块 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 5 K Ω 表示电路中存在开路。 止动块 |
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