VAZ 2114: replacing the ignition coil (module) - signs of malfunction, how to check, module selection

What to do if the ignition module fails? When does it need to be changed, for what symptoms? These questions are often found on the Internet. In our article we will try to cover in detail all the nuances associated with replacing the ignition coil on a VAZ 2114. In addition, we will tell you how to check the device with a multimeter, and also consider in detail the process of replacing this part.

This video clearly shows the process of replacing the ignition module on a VAZ 2114:

Symptoms of a faulty ignition coil

The module's task is to transmit voltage to the spark plugs through high-voltage conductors. In this case, the electronic control unit (ECU) controls the transmission process by sending charged pulses to the winding. As a result, a spark is formed necessary to ignite the fuel inside the combustion chamber.

If this circuit is broken, the engine will run intermittently, which will affect the safety of the car. There are several signs that make it clear to the car owner that the coil and the ignition system as a whole need to be checked:

• Insufficient engine power when accelerating the car;
• When you press the gas pedal, the car does not pick up speed, especially when overtaking;
• When the car is idling, the engine runs intermittently;
• The spark plug does not produce a spark.

Advice. When the first signs of a vehicle malfunction appear, the first thing you need to do is look at the spark plugs, then make sure the crankshaft position sensor is working, and only then move on to the module.

Design

The design of the ignition module is quite complex, since it combines technology and electrics. The device serves to create high voltage transmitted to the spark plugs. It is this supplied current that is the basis for ignition.

The operation of the module ensures fuel combustion and, accordingly, engine operation. In very simple terms, the car won’t go anywhere without the module.

For VAZ models, the use of two types of ignition modules is provided:

• Separate;
• Block.

Block ones differ in that the coils operate one per pair of spark plugs. These are the devices that are installed on the “fourteenth” model of the domestic automaker.

The coil distributes power to two candles at once, and its design includes the following elements:

• High voltage wires;
• Low voltage terminals;
• Secondary and primary winding;
• Core.

Separate modules, where the coils supply a separate circuit to each of the 4 sections, are distinguished by the output of high-voltage wires through a spring contact. Block ones are easier to check, they are easy to remove and return to their place.

It is noteworthy that with a size of 11x11x7 centimeters, this block weighs about 1.5 kilograms.

Checking the ignition coil on a VAZ 2114

You can make the module work independently if you have the appropriate equipment at hand. The simplest solution is to carry out diagnostics using a multimeter:

1. Set the device to ohmometer mode.
2. The resistance between the high-voltage terminals is measured. To do this, the probes are installed first between wires 2 and 3, then 1 and 4.

1. The corresponding number will appear on the display. If it does not exceed 5.5 kOhm, then everything is in perfect order and the coil does not require replacement.

Important! The measurement result in both cases should be the same. The error is allowed within 100 ohms.

Checking module 2114 using improvised methods

1. There is a reliable way to determine that the ignition module is faulty. You need to take a working module and try to start the engine on it. Not every module may be suitable. If you are lucky and the engine is working, this means we send our module to the trash heap and install a new one. In addition, there is a fairly high probability that there is damage in the high-voltage wires and this will not only prevent us from testing our hypothesis, but may also damage the donor ignition module. This means that before checking the module itself, you need to make sure that the high-voltage wires are not damaged, do not break through to ground, and hold the current well.
2. Checking the high-voltage circuit of the module for an open circuit. To do this, you need to take a micromultimeter and set it to resistance measurement mode. In the ignition module, the ignition coils are connected in parallel - the first with the fourth, the second with the third. To check, take a micromultimeter and install the probes into the connectors for high-voltage wires on the module when the ignition is turned off. First the 1st and 4th, then the 2nd and 3rd cylinders. The resistance between parallel coils should be 5.0-5.6 Ohms. If the resistance is infinite, then the network is broken and the module must be replaced.
3. There is also an old-fashioned way of checking - to hit it well. This may help wake him up for a while, oddly enough. And it will give you time to pick up a new part at an auto parts store.

Necessary tool

To replace the ignition module on a VAZ 2114, no special equipment is required. To change a part, just prepare the following tool:

• Set of socket wrenches;
• Hexagon 5;
• Screwdrivers;
• A rag or rag.

The process of replacing the ignition module

The entire procedure is carried out on a horizontal surface in the garage or on the street. The procedure for replacing the ignition coil of a VAZ 2114 is as follows:

1. Raise the hood and disconnect the battery. To do this, use a 10mm wrench, slightly loosen the nut securing the minus terminal, and remove it from the battery.

1. We take out the high-voltage wires. Here it is important to remember (you can take a photo) where and which wire was connected. For your convenience, we have written a separate article about the order of high-voltage wires. It is strictly forbidden to swap wires so as not to damage the ignition module the next time it is turned on.
2. Disconnect the four high-voltage wires.

1. Using a 13 mm socket wrench, unscrew the nuts that secure the module to the engine.

1. After removing the nuts, we dismantle the equipment.

1. Unscrew the screw securing the coil to the motor using a hexagon.
2. Next, the installation site of the coil should be thoroughly wiped from accumulated dirt. To do this, you can use a rag or a clean rag.
3. We install new equipment in the cleaned area in reverse order.
4. Correctly connect high-voltage wires. Their numbers must be indicated on the block.

Advice . To ensure reliable contact, the mounting of the coil and the motor housing should be thoroughly cleaned.

Module replacement

Replacement is a fairly common solution to the problem of a faulty ignition module. The procedure is performed as follows:

• Locate the ignition module. If anything, high voltage wires go from the spark plugs to it. You can't go wrong;
• Remove the negative terminal from the battery;
• Disconnect the wiring block from the ignition module;
• Turn off the high voltage;
• Dismantle the module and remove it;
• Place a new coil, or rather a module, in place of the old device, and reassemble in the reverse order;
• Please do not confuse the location of the high voltage wires on the module, otherwise you will have to buy a new component;
• For preventive purposes, it would not be a bad idea to replace the old wires. Especially if there are yellow stripes on the tips of the spark plugs and on the wiring themselves. This is clear evidence that the elements must be replaced.

How to choose an ignition module?

On a VAZ 2114 car (8 valves), it is recommended to install an original part with a catalog number 2112-3705010.

The market value of such a module ranges from 2800 to 4000 rubles. However, some car owners select non-original spare parts from another manufacturer for their car. This may be fraught with consequences for the further operation of the vehicle, since the presented analogues may be of poor quality.

System diagnostics

If signs of damage are detected, there is no need to immediately remove and repair the MH. First, the spark plugs must be checked; to do this, they are removed from their sockets, and the high-voltage wires are first disconnected from the spark plugs. The spark plugs should be carefully inspected, cleaned of carbon and deposits, and then checked again.

Brown color is acceptable on these devices, but soot and carbon deposits are undesirable. If necessary, you also need to adjust the gap between the element itself and the electrodes. More detailed instructions for diagnosing the module yourself are given in the video below (the author of the video is Alexey Romanov).

How to quickly check the performance of the coil at home:

1. Of course, the fastest and easiest way would be to install a unit that is known to work, but it is unlikely that anyone will carry a working spare device with them.
2. While the engine is running, try tapping the coil. If you notice changes in the operation of the motor, this indicates that there is poor contact inside the device.
3. The most accurate results can be obtained from diagnostics with a multimeter. You need to measure the resistance of the paired terminals of the coils, in particular the first and fourth, as well as the second and third. The parameter should be 5.4 kOhm; if the values ​​differ, the device needs to be repaired or replaced.

Why does the ignition module often fail?

Main sources of malfunction:

1. The engine has spark plugs that do not meet the specified parameters. The gap does not meet the manufacturer's requirements. Excessive contamination of the spark plug contact, presence of carbon deposits. A visual inspection will help prevent parts from malfunctioning.
2. The ignition coil operates when the high-voltage wire is disconnected. In this case, the engine may not operate correctly.
3. If the device is not sufficiently secured to the motor body, then excessive vibration will eventually lead to failure of the coil. The internal soldering of the equipment is broken, which leads to a malfunction of the module.
4. Poor contact of low-voltage wires can also cause a malfunction of the ignition system.
5. A defective module has been installed. You may not notice this right away, but after a certain time the module will make itself known. Such parts cannot be repaired; it will have to be replaced with a new one.
6. Condensation appears inside the module housing, which leads to a short circuit in the system and its failure.

Common faults

Any experienced car enthusiast will answer that the main symptoms of failure of the MH include the absence of a spark on the candles. This is partly correct, but there are several other symptoms.

The main symptoms of a faulty MZ on an 8-valve injector engine are as follows:

• when accelerating, the car's dynamics deteriorated;
• Difficulties in the operation of the internal combustion engine began to appear, this is especially felt when you sharply press the gas;
• another symptom is a drop in the power of the power unit, a deterioration in its traction;
• floating idle speed;
• There is no spark on one of the spark plugs.

In addition, when the module begins to work poorly, an error appears on the dashboard - misfire in the cylinders.

Useful video

You can find interesting information by watching the additional video below: https://www.youtube.com/watch?v=pNyBny-_HoQ

On a car with contactless ignition, everything is even easier; you don’t have to remove the wheels, but you will need an assistant. It is necessary to find the compression stroke of the fourth cylinder. To do this, insert a rubber cone into the spark plug hole and turn the ratchet. Pushing out the cone will mean that the compression stroke has been found.

Having illuminated the spark plug hole, we align the longest mark of the cover with the mark of the pulley. We set the breaker to the appropriate clock and check the operation of the system according to the fourth point described above.

Connection diagram

The ignition module is part of the space under the hood, it’s easier to find it by the position of the high voltages, they go from the spark plugs straight to it.

VAZ 2114 ignition coil diagram

This diagram is good to follow when you have to replace the ignition coil of a VAZ 2114. In principle, everything is transparent: from contacts with the controller (ECU) to high-voltage wires. The name of the circuit is often common under the name ignition coil pinout: the pinout is a visual representation of the functionality of the device's contacts, which are numbered according to their purpose.

Basically, the most necessary knowledge about what the pinout of the ignition coil is is carried by high-voltage wires (abbreviated as HF (contacts). Because it is through the HF contacts that, in fact, the ignition module is connected to the engine system.

It can be connected in two different ways: when the ignition system coil is removed and when it is directly in its place in the car engine.

If you are holding the module in front of you:

• Let us recall the diagram: the first and fourth contacts are on one winding, the second and third – on the other (they are numbered in the diagram!)
• Then, the lower explosive contact (left) goes to the first cylinder
• On the second - upper explosive contact (left)
• The third cylinder goes to the upper explosive contact (right)
• On the fourth – lower explosive contact (right)

If the module is plugged into the engine, then pinouting the explosive contacts will be more difficult, because the device stands at an angle (as if in a diamond):

• We throw the central lower contact onto the first cylinder
• On the second - left contact
• We put the upper contact on the third cylinder
• On the fourth - right contact

Of course, the first installation option is more convenient, especially since the explosive wires require increased care in the nature of the connection (mixed up and won’t start, in the worst case, the entire engine system is ruined). Speaking to the point, it is clear that the connection diagram for the VAZ 2114 ignition module is not complicated.

By the way, buying an ignition coil is not a cheap pleasure; the price of an ignition module for a VAZ 2114 ranges from seven hundred to a thousand rubles, depending on the location of your city on the map of our country (for more information about how much an ignition module for a VAZ 2114 costs, you can find out by calling a disassembly service or a spare parts store, the running part is almost always in stock).