Free zone HS code compliance

List of contents in this article:

• 1, What is the first-level route of automobile transportation?
• 2
  、How to check car lines
• 3,Free zone HS code compliance Brimply describe the method of car line overhaul
• 4, How to detect and solve automobile line short circuit
• 5, Is it necessary to maintain the car engine line
• 6, What is the car ignition line

What is the first-level route of automobile transportation?

National first-class highway, that is, national trunk highwayRoad refers to the main highways of national political and economic significance, including important international highways, national defense highways, highways connecting the capitals with the capitals of provinces, autonomous regions and municipalities directly under the Central Government, and highways connecting major economic centers, port hubs, commodity production bases and strategic locations.

First-class highways are highways that provide traffic for cars to drive in different directions and lanes, and partially control entry and exit, and partially three-dimensional intersections. It mainly connects important political and economic centers and leads to key industrial and mining areas. It is the trunk highway of the country.

First-class highways are highways for cars to drive in different directions and lanes. Two-way four-lane first-class highways can generally adapt to the long-term design of various vehicles converted into small buses. The average annual day and night traffic volume is 15,000 to 30,000 vehicles, which is 10,000 higher than the minimum traffic capacity of similar highways.

First-class highway: It is a type of highway grade in China. It is located behind highways and before secondary highways, and is widely used in the construction of main trunk lines.

How to check the car line

1. Instrument method observes the indications of ammeter, water temperature meter, fuel gauge, oil pressure gauge, etc. Put it on the dashboard of the car and judge whether the circuit is faulty. For example, when the engine is cold and the ignition switch is on, the water temperature meter indicates that the full scale position does not move, indicating that the water temperature meter sensor is faulty or the line is grounded.

2. There are four inspection methods for automobile lines, namely visual inspection method, fire protection test method, test method and replacement method. The specific analysis is as follows. The naked eye observation method: the naked eye examination method is through observationThe pointer on the car dashboard, car lights and speakers can work normally to determine whether there is a problem with the car line.

3. Instrument detection method Observe the prompt information on the instrument indicator panel in the main driving position of the car, so as to grasp whether there is a fault problem in the car line.

4. The query method of the bus route is as follows: Open Baidu Map, enter the starting point and destination, and search for whether there is a bus to travel, and you can check it. Call the local 114 to inquire about the bus information of the relevant routes. Consult local tourism agencies, passenger terminals or online ticketing platforms for bus service information on relevant routes.

5. The inspection method of Buick Enlang low-voltage line is as follows: When the vehicle is turned off, use a multimeter or voltmeter to check whether the battery voltage is within the normal range, which should generally be around 12V.Check whether the low-voltage line fuse is melted or failed. Check whether the terminals of the low-voltage line are loose or oxidized.

6. First, open the map, and then enter the map, or directly enter Baidu map, Gaode map, etc., and then click (take Baidu map as an example). Then a box appears, and then click the arrow in the picture. Then select Driving, and enter the name of the location you want to inquire about at the starting and ending points.

Briefly describe the method of car line overhaul

Test light method The test light method is to use a car light bulb as a test light to check whether there is a circuit failure in the circuit. Instrumentation method Observe the indications of ammeters, water temperature meters, fuel gauges, oil pressure gauges, etc. on the car dashboard, and judge whether there is a fault in the circuit.

Naked eye viewing method: The naked eye viewing method is to judge whether the car line is faulty by observing the pointers, car lights and horns on the car dashboard to see if they can work normally. Test-fire method: The test-fire method is to observe whether there are sparks through the contact between the wiring column and the car body. But the test fire method is average.

The following are the methods of maintenance and inspection of automobile lines: Intuitive diagnosis method: When the automobile circuit fails, there are sometimes abnormal phenomena such as smoke, sparks, abnormal sound, burning odor, heat, etc. These phenomena can be directly observed so that the fault can be judged.

Whether all fuses and relays are complete and effective, whether the installation is firm, whether the rated value meets the circuit requirements; whether the switches and buttons are working normally, whether there is a card failure, etc. Use the self-diagnostic system for diagnosis. For vehicles with a relatively complete driver information system, relevant maintenance can be carried out according to the display of warning lights or warning lights.

How to detect and solve automobile line short circuits

Test light method: Test light method isA method of using test lamps to diagnose circuit faults has the advantage that it can quickly judge short circuits and broken circuit faults in the circuit.

You can use the test lamp to troubleshoot, connect the test lamp to the fuse, and disconnect and close the circuit components at once. If the test light is not on, the fault will be found.

Open circuit method When a grounding (short circuit) failure occurs in automobile circuit equipment, it can be judged by the open circuit method, that is, after the circuit segment suspected of having a grounding fault is disconnected, observe whether there is still a grounding fault in the electrical equipment, so as to judge the location and cause of the circuit grounding.

Is it necessary to maintain the car engine line

The line of the car is equivalent to the meridians of the human body, when the wire harnessIf something goes wrong, the engine will be affected. If it is small, the vehicle cannot start, and if it is large, it will cause a fire. It can be seen that its importance directly affects the safety performance of the car. It can be seen that engine harness maintenance is very necessary.

It is necessary to maintain the car engine line. The following is a relevant introduction: wire harness aging: The interior of the engine wire harness is generally composed of multiple copper soft wires and the exterior is wrapped in plastic.

The engine of vehicles that have been used for a long time has more oil and carbon accumulation than normal vehicles, and the engine line is seriously aging and cracked. Therefore, the engine and circuit of the old car need regular maintenance, so as to extend the service life as much as possible.

What is the car ignition line

What is the car ignition line?Automotive electronic ignition line: The electronic ignition system is completely different from the mechanical ignition system. It has an electronic control device for ignition, and there is an ignition control curve (MAP diagram) required by the engine under various working conditions.

Fire wire, the power line that transmits electricity in the circuit, refers to the wire connected to the positive pole in the DC circuit. There is also a zero line that is used at the same time as the fire line. When the ignition switch is in the "OFF" position.

Automotive electronic ignition circuit: the electronic ignition system is completely different from the mechanical ignition system. It is a bit of fire electronic adjustment device, with the ignition adjustment curve (MAP) required by the engine under various working conditions.

The four wires of the ignition coil plug of the car are iron wire, signal wire, power cable and signal wire respectively. Its function is: iron wire: rely on these iron wires to transmit current.Signal line: connected to the engine control module. Power cord: connected to power, providing power supply.

The function of the three wires of the ignition coil: power cord: voltage is provided by the ignition switch and main relay; iron wire: control with the engine ECU; control signal line: it is the switch signal output in the ECU computer circuit board, which controls the ignition signal. The ignition coil is one of the parts of the car igniter.

What is the ignition line of the car? Automotive electronic ignition circuit; the electronic ignition system is completely different from the mechanical ignition system. It has an electronic ignition control device with the ignition control curve (MAP diagram) required by the engine under various working conditions.