What is the meaning of the 4 wires of the Volkswagen ignition coil?

The ignition coil is composed of the main coil, the secondary coil, the magnetic core, the switching triode and other auxiliary components, the main coil is charged by the battery, the secondary coil is discharged and the spark plug is ignited, and the triode is responsible for switching. The charging time is controlled by the battery voltage and engine speed to ensure that the energy of each charge is consistent, the ignition coil has two kinds: 3 wires and 4 wires, 3 wires are positive and negative for the power supply, and the switch controls the ECU instruction, and the 4 wires have an additional ignition detection line, which can detect whether the spark plug is ignited and whether there is a discharge current in the secondary coil.

To put it simply, the ignition coil is a transformer, that is, the voltage of tens of volts is raised to tens of thousands of volts, but the voltage input to the primary coil is provided by the electronic ignition.

2: The reason why the ignition coil burns out.

Mainly the aging breakdown of the insulation layer or the damage of the switching triode, the large spark plug gap will lead to the main coil load, large heating, fast aging of the insulation layer, small spark plug gap leads to large discharge current of the secondary coil, fast heating, fast aging of the insulation layer, the assembled ignition coil may have poor durability of insulating materials, large internal resistance of the coil and fast heating, and the life of the transistor will be shorter if the quality is not high.

If it is always burned out, and it burns out soon after replacement, and why?

Let's take a look at the problem of the generator first, if the power generation is too high, the load of the ignition coil is too heavy, it is easy to burn out, but if the power generation is too high, then the body electrical appliances, such as light bulbs, will often be damaged; Of course, the quality of the accessories is not ruled out, so it is best to measure the power generation first.

If the spark plug gap is too large, adjust the gap or replace the spark plug.

The quality of gasoline is not good, try to change to high-grade gasoline.

If the compression ratio of the cylinder is wrong, adjust the compression ratio.

If there is a program failure in the computer version, you can go to the repair shop and use the computer to test the car and clear the wrong information. If it doesn't work, it may be that there is a problem with your car's transmission.

The power supply voltage is unstable.

The resistance of the high voltage is abnormal, replace the high voltage line.

There is a short circuit in the secondary.

The ignition coil is overheated due to the high primary current of the ignition controller.

It does not work well when subjected to high temperature and high pressure waves.

There is a small chance that it is a problem with the coil itself, so you can try a different brand.

The ignitor manifold does not work well.

The power signal is tied to the iron.

The four wires of the ignition coil plug of the car are the tie wire, the signal line, the power line, and the signal line.

Its functions are: 1. Tie wire: rely on these tie wires to transmit current.

2. Signal line: connected to the engine control module.

3. Power cord: connect and provide power supply.

1. Battery voltage power supply.

2. The engine computer outputs a pulse 5V ignition signal.

3. The primary ignition coil is grounded.

4. The secondary ignition coil is grounded.

They are the positive electrode, negative electrode, and engine control unit signal line.

It is the high-voltage conductor that goes out. The four-cylinder engine is connected to four spark plugs, and what enters is the signal line!

One is the 15-gauge electric from the relay or the computer to the ignition coil, then the ignition signal from the computer to the transistor, then the ground wire, which is the primary coil ground, and the last one is the feedback.

You can look at the ignition waveform and tell the computer if the coil is broken.

1 x 12V power cord, 1 x ignition switch signal cable.

1 ignition switch line, 1 low-voltage wire at the distributor end.

One is the 15-gauge electricity given by the relay or the computer, and the transistor leads to the ignition coil, and then the ignition signal is the computer to the transistor.

Then one is the ground wire, which is the primary coil ground.

The last one is feedback.

You can see the ignition waveform.

Tell the computer if the coil is broken.