The VAZ-2110 ignition module is designed to supply high voltage to the candles. This is one of the most important elements, its failure disrupts the engine. With this device, the signal from the electronic control unit is amplified - a voltage of about 30 kV. Due to the fact that the ignition module is located in the engine compartment and is constantly exposed to overheating, dust and water, it fails. The most vulnerable nodes are semiconductor elements.
Design features
If you are familiar with the designs of automotive systems, you can draw parallels between the high-voltage coil and the ignition module VAZ-2110. Malfunctions of this device appear in exactly the same way. In fact, this is a symbiosis of a high-voltage coil and a switch. The design includes the following:
1. Two coils are used to generate the high-voltage impulses necessary to ignite the combustible mixture with the aid of candles.
2. Two-channel switch of conductive elements.
The device may fail unexpectedly. Despite the fact that the car has a self-diagnosis system, the warning lamp on the dashboard of the Check Engine will not light up. Usually one of the switch channels fails, this is manifested by the unstable operation of the motor, sometimes by stopping it.
Typical module failures
If you have at least a little knowledge of electronics, as well as a multimeter, you can independently diagnose and identify the problem. Checking the ignition module of the VAZ-2110 will take a little time, but it will save you from acquiring an expensive unit. Please note that sometimes races appear that disappear with time.
Errors will remain in the microcontroller, so you can read them using special testers. But as practice shows, at the time when the malfunctions do not manifest themselves, the tester can not recognize error codes that were earlier, but then disappeared. Very often, the cause of failures is dirt on the contacts, poor fastening of the case, lack of mass, the presence of electrical noise.
Removing the ignition module
In order to repair the ignition module VAZ-2110, it must be dismantled. First, check if there is a high voltage on all pins. The most common failure is the lack of spark in the second and third cylinders. If you slightly push the back of the case, the engine may begin to work in normal mode. But this is not for long. To remove you need:
1. Disconnect the mass from the battery.
2. Remove the decorative cover that covers the head of the unit, if any.
3. Remove all high voltage wires.
4. Disconnect all wires to the ignition module. The white rings indicate the numbering of all the wires. On the casing of the device there is a designation of cylinder numbers.
5. Disconnect the connector from the device.
6. Unscrew the three nuts securing the unit.
That's all, the ignition module VAZ-2110 is removed, and you can begin to repair it.
How to restore
Opening the aluminum plate, you will find a small-sized printed circuit board on which the active components are located. It is coated with transparent silicone. It will need to be removed, as it will interfere with the repair. Pay attention to the wires that connect the board and connector pins. They are aluminum, and this metal undergoes destruction much faster than copper. All of these wires will need to be replaced. Some motorists who repair modules use wires that are used in mice for personal computers. But you need to get used to working with them - they are covered with paint.
In general, the scheme of the entire module is simple, it contains:
1. Two transistors BU931 (you can use the domestic analog of KT848A, it shows itself well, and it costs much cheaper).
2. Two switches SGS-THOMSON (model L497D1).
What you need to know when working with the module
Before working with the module, you must purchase a flux for aluminum. When replacing transistors, note that it is very difficult to solder the wires to the collector terminals, since they are covered with a special material. And it complicates the soldering. To facilitate your work, carefully open the spray. Try not to overheat the element. Place it on an aluminum plate so that all the heat goes into it. Otherwise, the semiconductor junction will collapse and you will ruin the expensive element.
When soldering wires, make sure that their length is as short as possible. All places of soldering must be varnished, even for nails. After the repair, be sure to check the performance of the ignition module VAZ-2110. If it functions in the normal mode, then it is necessary to process everything inside with auto-sealant. This will ensure maximum tightness of the unit - neither water nor dust can get into it. And such a device will last for many years. But if the problem is not in the contacts or power transistors, it is better to leave the idea of repair and purchase a new module - on the VAZ-2110 it costs about 1,500 rubles.