Product Link 151/201 Caterpillar


Wiring Harness (Short Circuit) - Test

Usage:

631E 1AB
短路故障会导致不必要的电流,通常为电路旁通负载。

例如:指示灯电路导线之间短路会在导线中产生过大电流,但指示灯上却没有电流。 指示灯电路短路。

注: 正常电路电阻可变,但特定电路与其他无关电路之间的正常电阻始终 ≥ 5K Ω。

短路测试

表 1
故障诊断与排除测试步骤     数值     结果    

1. 确定短路

A. 识别可疑电路的接头和导线编号 (1) 字样。

B. 切断钥匙开关和断路开关。

C. 从线束上断开部件和 ECM。

D. 在 ECM 线束接头上,将万用表表笔置于可疑导线触点上。

E. 使用其他万用表表笔检查所有其他 ECM 接头触点与机架接地之间的电阻。    
≥ 5K Ω    
正常 - 所有电阻 ≥ 5K Ω。

止动块

不正常 - 电阻 < 5 Ω。 可疑导线与低电阻导线之间存在短路 (2) 字样。

修理:

修理或更换线束。

止动块    
( 1 ) 使用机器电气示意图。
( 2 ) 电阻 ≥ 5 Ω 但 < 5K Ω 表示连接松动或腐蚀。 电阻 ≥ 5K Ω 表示存在开路。

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