Automotive Engine Wiring Harness and Inspection Harness Replacements

In automotive applications, the wiring harness failure potential is strong, but the fault hazard advantage is great, especially the wiring harness overheating and wiring harness short circuit failure, easy to cause fire. Timely, fast, accurate discovery of hidden wiring harness, reliable repair of faulty wiring harness or correct replacement of the wiring harness, is an important work in automotive maintenance, is to prevent automotive fire accidents, to ensure the safe and reliable use of automotive important measures. First, the function of the automobile harness in order to make the car line easy to install, neatly arranged to protect the wire insulation, to ensure the safety of automobile use, the whole line on the car (except for high-voltage lines, battery cables and starter cables) with cotton yarn or fine PVC tape wrapped into a bundle. Second, the composition of the wiring harness by different specifications, different performance of the wire composition, the main specifications and performance requirements are as follows: 1, the cross-sectional area of the conductor should be based on the load and current of the electrical equipment, select the cross-sectional area of the conductor, the general principle is that the working time of the electrical equipment can be selected for a long time of the actual current of the 60% of the electrical equipment can be selected for a short period of time the electrical equipment can be selected for the actual current of the 60% of the conductor to the wire between the,. 2, Color of Conductors The car's circuit has a color and serial number on it. As the number of electrical devices in the car increases, so does the number of conductors. In order to facilitate the identification and maintenance of automotive electrical equipment, the low-voltage wires in a car's circuit are usually composed of wires of different colors, which are marked with a color letter code on the car's PRZEWOD diagram. In showing the car conductor circuit diagrams that are generally marked as color codes (indicated by one or two letters), the car colors of the wires are usually different, and the two commonly used monochrome and colored selection principles. Such as: red (R), black (B), white (W), green (G), yellow (Y), black and white (BW), red and yellow (RY). One of the color color line former, the latter supplemented by the color. 3, the physical properties of the wire (1) bending, the door and the door between the body of the metal wire should be made of well-bent metal wire. (2) high temperature resistance, high temperature parts of the use of wire, general insulation and heat resistance of good vinyl chloride, polyethylene coated wire. (3) shielding properties, in recent years, the use of weak signal wires electromagnetic wave shielding circuits also increased. 4, the wire harness wrapping (1) the use of semi-folding packaging, painting, drying and other processes to improve the strength and insulation properties of the cable. (2) A new type of wire harness, partially wrapped in plastic, placed in a side-cut plastic bellows, making it stronger, more protected and easier to find faulty lines.

Third, the type of automotive wiring harness failure 1, natural damage wiring harness use more than the service life, so that the wire aging, insulation rupture, mechanical strength is significantly reduced, resulting in short circuits between wires, disconnection, buildup of iron cores, etc.. Harness terminal oxidation, deformation, resulting in poor contact, can lead to electrical equipment can not work properly. 2, electrical faults lead to harness damage when overload, short circuit, ground faults occur in the electrical equipment, can be caused to the damage to the wire harness. 3, man-made faults in assembling or repairing automotive parts, metal objects crushed harness, so that the wire harness insulation layer breaks; harness location is not appropriate; misconnection of the electrical equipment lead location; battery Positive and negative lead reversed; circuit breakers, wiring harness mess will cause abnormal operation of electrical equipment, and even burn the harness. Fourth, the automotive wiring harness inspection methods 1, intuitive inspection method when a part of the vehicle's electrical system failure, there will be smoke, sparks, noise, burning odor, heat and other abnormal phenomena. By listening to the body's senses, sense of touch, sense of smell, see the automotive wiring harness and electrical visual inspection, and then determine where the fault lies in the part, thus greatly improving the speed of detection. For example, when the car wiring failure, there are often smoke, sparks, noise, burning odor, heat and other abnormal phenomena. Through visual inspection, parts can quickly determine the fault and the nature of the fault lies. 2, the instrument inspection method using a comprehensive fault diagnostic instrument, multimeter, oscilloscope, current clamp and other instruments to diagnose automotive circuit faults,, for the electronic control system for cars, the general use of diagnostic instrument to find fault codes on the measurement of the fault range diagnosis; and then use a multimeter, current clamp or oscilloscope to check the relevant circuit Voltage, resistance, current or waveform, the harness wire failure point diagnosis,, 3, tool inspection method test lamp inspection method is more suitable for short-circuit fault conditions, check the wire. Using the temporary test lamp test method should be noted that the lamp power is not too large, in particular, whether there should be careful, as well as whether there is enough output in the electronic controller test control output output terminals, said controller used to prevent damage from overload. Again preferred diode lamps. 4, jumper wire inspection method cross connection method is to use wires to connect the suspected fault line, observe the changes in the meter pointer or the working condition of the electrical equipment, and then determine whether the line has a broken circuit or poor contact,, cross connection refers to the use of a wire to connect the operation of two points in the circuit,, the potential difference between the two points of the circuit is zero, not short-circuited,, 5, repair of the wiring harness for minor mechanical damage to the Wiring harness in the obvious insulation damage, short circuit, loose wiring, wire connector rust or bad way to carry out, can be used to repair; wiring harness failure repair, to occur the root cause of the failure, completely eliminate, and again to eliminate the failure to reoccur usually may be due to friction by the root cause of the wires and the impact of the metal parts. 6, the replacement of the wiring harness for the wiring harness aging, serious damage, short circuit of the internal wiring or the internal wiring Disconnection failure, usually need to replace the harness. 1, replace the harness before checking the quality of the harness,, in order to ensure the safety and reliability of the harness, before use must be strictly controlled, there should be a certificate of conformity inspection, found that defects are not allowed to use, to prevent the hazards caused by substandard products,, under the conditions of the better to check with the instrument. Let include checking: whether the damaged harness, deformation, corrosion or no terminal, the connector itself, whether the connector is bad harness connector and harness short circuit, short circuit conditions. Test tool is essential. 2, do not replace the wiring harness until all the electrical equipment in the car is faulty. 3, wiring harness replacement steps (1) prepared wiring harness disassembly tool. (2) Remove the defective vehicle's battery. (3) Disconnect the connectors of the electrical equipment connected to the wiring harness. (4) Make a record of the entire process. (5) Loosen and secure wiring harness. (6) Disassemble the old wiring harness and assemble the new wiring harness. 4. Verify the correctness of the connections in the new wiring harness. Connecting the wiring harness connectors and electrical equipment is correct is a confirmation, but also ensures that the positive and negative battery connections are correct. During the inspection, wires that are not connected to the battery can be shown and a bulb (12v, 20w) is used to test the bulb. Prior to this, other electrical equipment to the car is turned off and then the negative terminal between the battery and the frame is connected with a test lamp. As soon as there is a problem with the circuit, the test light starts to turn on. When the circuit is faulty, remove the bulb and connect a 30A fuse in series between the negative terminal of the battery and the end of the frame,, do not start the engine at this time, check the corresponding power supply equipment on the car one by one and check the related lines one by one,,, 5, the test of the power supply work. Electrical equipment and wiring associated with the answer, if there is no problem, the fuse can be removed, connect the battery ground wire, power test. 6, check the wiring harness installation. Ideally, check the wiring harness installation is correct and safe. 7, conclusion of the automotive wiring harness failure hidden dangers, but as long as the combination of automotive maintenance work in practice, serious study and use of modern technical means and methods, fault diagnosis is still regular; similarly, in the wiring harness repair and replacement work, to strengthen the research, and constantly improve the maintenance standards, to ensure that automotive application maintenance is safe and reliable.

2, on the federal electronic products network platform related to the introduction and sales of products brief: federal electronic products network - professional agent / production / sales of all kinds of [connectors | wiring harness | wire and cable production]; if you have a relevant [connectors | wiring harness | wire and cable production] purchasing / sourcing needs or would like to buy / to understand which connectors | wiring harness | wire and cable products we can provide solutions, please contact our business staff below; if you have a relevant [connectors | wiring harness | wire and cable production] sales / resources and promotion needs, please click on the "¡¡ Business Cooperation ←" and discuss with a person! If you have related [connectors | harness | wire and cable production] sales / resources and promotion needs, please click on the ¡¡ Business Cooperation ← ¡" to discuss with a person!