对于汽车发动机线束老化、严重破损、内部导线短路或内部导线短路断路的故障，通常须更换线束。那么汽车发动机线束的更换要遵循怎样的标准？下面
济南沃尔沃汽车养护人员为你讲解：
For the faults of aging, serious damage, internal wire short circuit or internal wire short circuit and open circuit of automobile engine wiring harness, it is usually necessary to replace the wiring harness. What standards should be followed for the replacement of automobile engine harness? The maintenance personnel of Jinan Volvo Cars will explain to you:
1.更换线束前的线束质量检查。
1. Check the harness quality before replacing the harness.
为确保线束安全可靠，使用前须严格把控，应认证检查，发现缺陷不得使用，防止不合格产品带来的危害。有条件，好使用仪器来检查。
In order to ensure the safety and reliability of the harness, the harness must be strictly controlled before use, and it should be certified and inspected. Defects found should not be used to prevent the harm caused by unqualified products. If conditions permit, it is easy to use instruments to check.
检查内让包括：线束有无破损，插接器有无变形，端子有无锈蚀，插接器本身、线束与插接器有无接触不良，以及线束有无短路、短路的情况。线束的检验是不可少的。
The inspection includes: whether the harness is damaged, whether the connector is deformed, whether the terminal is rusted, whether the connector itself, harness and connector are in poor contact, and whether the harness is in short circuit or short circuit. The inspection of harness is indispensable.
2.排除车上所有的电气设备的故障，方可更换线束。
2. Remove the faults of all electrical equipment on the vehicle before replacing the harness.
3.线束更换步骤。
3. Harness replacement steps.
（1）准备线束拆装工具。
(1) Prepare the harness disassembly tool.
（2）拆卸故障车辆的蓄电池。
(2) Remove the battery of the faulty vehicle.
（3）断开与线束相连的用电设备的插接器。
(3) Disconnect the connector of the consumer connected to the harness.
（4）全程做好工作记录。
(4) Keep work records throughout the process.
（5）松开线束固定。
(5) Loosen the harness fixing.
（6）取下旧线束，装配新线束。
(6) Remove the old harness and assemble the new harness.
4.检验新线束连接的正确性。电线束插接器与电气设备的连接是否正确是先要确认的，还要确保蓄电池的正负连接无误。
4. Check the correctness of the new harness connection. The correct connection between the wire harness connector and the electrical equipment should be confirmed first, and the positive and negative connections of the battery should also be ensured.
检查时，可以展示不接蓄电池的搭铁线，改用灯泡（12V，20W）做试灯。在此之前，车上其它的用电设备要关闭，然后在蓄电池负与车架搭铁之间用试灯串连接。电路一旦有问题出现，试灯就开始变亮。
During the inspection, the grounding wire without battery can be displayed, and the light bulb (12V, 20W) can be used as the test lamp. Before that, turn off other electrical equipment on the vehicle, and then connect the battery negative and frame ground with a test lamp string. Once there is a problem with the circuit, the test lamp will start to light up.
当电路的故障排除之后，把灯泡取下来，用一只容量为30A的保险丝串接在蓄电池负与车架搭铁端之间。这时的发动机不要启动，对车上相应的电源设备一个个进行接通，并且要对相关的线路逐一的全面检查。
After the circuit fault is eliminated, take down the bulb and connect it in series with a 30A fuse between the negative side of the battery and the frame ground terminal. Do not start the engine at this time. Connect the corresponding power equipment on the vehicle one by one, and check the relevant lines one by one.
5.通电工作检验。电气设备以及相关的线路如果确认没有问题，就可以取下保险丝，连接好蓄电池搭铁线，进行通电检验。
5. Power-on work inspection. If there is no problem with the electrical equipment and related wiring, you can remove the fuse, connect the battery ground wire and conduct power-on inspection.
6.检查线束的安装。好，应检查线束安装，确保线束安装正确并牢固。
6. Check the installation of harness. OK, check the harness installation to ensure that the harness is installed correctly and firmly.
In the work of harness repair and replacement, research should be strengthened, and maintenance specifications should be constantly improved to ensure the safety and reliability of vehicle operation and maintenance. Come to our website for more relevant matters http://www.lutongqixiu.com Ask about it!
