對于汽車發動機線束老化、嚴重破損、內部導線短路或內部導線短路斷路的故障，通常須更換線束。那么汽車發動機線束的更換要遵循怎樣的標準？下面
濟南沃爾沃汽車養護人員為你講解：
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.更換線束前的線束質量檢查。
1. Check the harness quality before replacing the harness.
為確保線束安全可靠，使用前須嚴格把控，應認證檢查，發現缺陷不得使用，防止不合格產品帶來的危害。有條件，好使用儀器來檢查。
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.
檢查內讓包括：線束有無破損，插接器有無變形，端子有無銹蝕，插接器本身、線束與插接器有無接觸不良，以及線束有無短路、短路的情況。線束的檢驗是不可少的。
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.排除車上所有的電氣設備的故障，方可更換線束。
2. Remove the faults of all electrical equipment on the vehicle before replacing the harness.
3.線束更換步驟。
3. Harness replacement steps.
（1）準備線束拆裝工具。
(1) Prepare the harness disassembly tool.
（2）拆卸故障車輛的蓄電池。
(2) Remove the battery of the faulty vehicle.
（3）斷開與線束相連的用電設備的插接器。
(3) Disconnect the connector of the consumer connected to the harness.
（4）全程做好工作記錄。
(4) Keep work records throughout the process.
（5）松開線束固定。
(5) Loosen the harness fixing.
（6）取下舊線束，裝配新線束。
(6) Remove the old harness and assemble the new harness.
4.檢驗新線束連接的正確性。電線束插接器與電氣設備的連接是否正確是先要確認的，還要確保蓄電池的正負連接無誤。
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.
檢查時，可以展示不接蓄電池的搭鐵線，改用燈泡（12V，20W）做試燈。在此之前，車上其它的用電設備要關閉，然后在蓄電池負與車架搭鐵之間用試燈串連接。電路一旦有問題出現，試燈就開始變亮。
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.
當電路的故障排除之后，把燈泡取下來，用一只容量為30A的保險絲串接在蓄電池負與車架搭鐵端之間。這時的發動機不要啟動，對車上相應的電源設備一個個進行接通，并且要對相關的線路逐一的全面檢查。
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.通電工作檢驗。電氣設備以及相關的線路如果確認沒有問題，就可以取下保險絲，連接好蓄電池搭鐵線，進行通電檢驗。
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.檢查線束的安裝。好，應檢查線束安裝，確保線束安裝正確并牢固。
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.zhongzaojixie.com Ask about it!
