Knock sensor VAZ 2114 where to find the causes of the malfunction check and replacement

Despite the fact that the car has a considerable number of installed sensors responsible for various parameters of its operation, only a few of them are of the greatest importance. These include the knock sensor of the VAZ 2114.

This device is used to record vibration (detonation) conditions of fuel during its direct combustion inside the engine. In addition, there is a constant transmission of data in the form of signals to the vehicle's ECU. As a result, the electronic unit adjusts (changes) the ignition timing. The importance of the device is due to the fact that if it fails or malfunctions, the ECU does not receive reliable data from it, and as a result, the detonation process is not damped.

The above circumstances have a destructive effect on the car engine. Therefore, negligence or failure to replace a part in a timely manner can destroy any motor. And this is not an exaggeration.

From this article you will learn why a knock sensor is needed, what problems may occur during its operation, and how to check and replace the sensor yourself.

Where is the knock sensor of the VAZ 2114

It is located between the second and third cylinders on the engine block (if viewed from the radiator side). Its location from the point of view of providing simple, unobstructed access is conveniently implemented in eight valve engines. But in more complex engines (16 valves), some inconvenience appears. This is due to the high density and accumulation of units in the engine compartment.

Most common faults

In fact, cases of failure of the detonation detection device itself are not so common. In most cases, the reasons for incorrect operation are auxiliary factors, such as:

1. Damage to the wires connecting the control unit to the sensor. As a result, the unit does not read signals from the device; contamination of the metal part of the part;
2. corrosion (as a result of environmental influences);
3. chafing breaks and wires;
4. oxidation of one or both contacts.

Less commonly, there is a complete failure of the internal piezo element (plate) of the device. In most cases, the sensor cannot be repaired, and the repair itself is not entirely rational in terms of effort, time and money. The surest way is to buy a new product; fortunately, it is not expensive.

Signs of malfunction of the knock sensor VAZ 2114

The knock sensor of the VAZ 2114 is a device on the serviceability of which the overall performance of the engine of the fourteenth depends. If the sensor fails, you will notice the following changes in the operation of the car:

• twitching of the internal combustion engine of the car;
• reduction in power indicators;
• an error appears on the instrument panel;
• increasing engine operating temperatures and rapid heating;
• increased fuel consumption;
• persistent smell of gasoline.

In order to understand the reason for the incorrect operation of the internal combustion engine, it is necessary to connect a diagnostic tool. Such a device allows you to read and display the code of a particular error. In our case, the following codes are distinguished: from 0325 to 0327 inclusive. All of them indicate that the sensor is not working properly.

What is a knock sensor and why is it needed?

This part is found in cars that use gasoline as fuel. It is intended for injection types of engines. The sensor is located on the engine cylinder block. This is an important part of the control system, the main purpose of which is to control the level of detonation.

• There is a similar article on this topic - What is engine chip tuning, pros and cons.
• In answering the question of what the knock sensor is responsible for , it should be noted that thanks to it the following vehicle capabilities are realized:

• Fuel economy.
• The ability of the engine to develop maximum power.

Detonation is the electrical impulse created during ignition. It is thanks to detonation that the car starts, complex chemical and physical processes occur inside the engine, and the fuel ignites.

The sensor monitors the vehicle's starting system and regulates its proper operation.

What are the main components of a knock sensor?

The main details of this mechanism are:

• Vibrating plate.
• Piezo type electrical element.
• Signal wire.
• Braid.

Where is the knock sensor located?

Depending on the make of the car, the location of the sensor may vary, but it is always located on the engine body. The part itself is very small, about the size of a matchbox.

Part installation features

An important feature of installing the sensor is the presence of an electronic ignition system in the car. If it is not there, then there is no sensor. Older models do not have a knock sensor. It is also not installed on carburetor engine systems.

The operating principle of the knock sensor is based on a piezoelectric mechanism. Inside the sensor there is a plate with a piezo effect. When detonation occurs, voltage is created at the input and output, and the engine vibrates. Otherwise, this is called the creation of a potential difference. If the voltage level at one end is too high, the sensor corrects this process.

If for any reason the sensor breaks down, the “Check” icon on the dashboard will light up. This will mean only one thing: urgent repair or replacement of the element is required.

Experienced car enthusiasts can detect by sound the presence of a malfunction in this mechanism, but if there is an electronic system, this is not necessary to know.

If the electrical circuit of the sensor is not broken, but a breakdown exists, the “Check” icon will not light up. Therefore, it is worth listening to your car sometimes.

How to check the knock sensor?

Unfortunately, the knock sensor can also fail. In this case, a person without special knowledge will be able to notice this only by the lit indicator. No other obvious signs will be noticed. The car will continue to operate in the same mode and start without any signs of breakdown.

1. At this point, it is necessary to remember that this device is not mechanical, it is part of an electronic system, and therefore the breakdown is considered electronic.
2. A knock sensor malfunction can happen for a number of different reasons, including:

• There has been a breakdown inside the sensor itself.
• Closure.
• The signal wire or braided shield is broken.
• Damage to the engine control unit.

Thus, it will not be difficult to identify the breakdown. In order to determine it, it is necessary to conduct a test.

The easiest way to check is to go to a car service center. There, experienced craftsmen will open the engine protection and identify the breakdown in just an hour.

• But those who are not looking for easy ways can always carry out this simple process on their own. Self-checking occurs according to the following scheme:

1. First, we remove the protection in the garage. You will have to work directly with the engine block.
2. Now we rule out a break in the signal wire and shielding braid. If it is torn or the braid is torn, you need to check the fastening of the plug and socket of the sensor. The integrity of the braid must be checked.
3. If a break is excluded, the outlet itself is assessed. It is possible that its connection is faulty and requires replacement.
4. You can detect faults in the device itself using a voltmeter. In this case, the car must be started and idling.
5. You also need to check the condition of the device contacts.

You can check it yourself in a slightly different way. For this you need a multimeter. This device is very often found among car enthusiasts.

A multimeter is a combination device that combines the functions of an ohmmeter, ammeter and voltmeter. You can use either a mechanical or an electronic device.

Checking the knock sensor with a multimeter is carried out only after it is removed from the engine. When checking, they knock on it with something metal. This method is the simplest.

We set the range to 200 mV, connect the positive and negative wires to the sensor terminal and to the metal ring, respectively. Do not confuse ground and signal pin! Now you need to hit it with something metal, but not too hard. The sensor will have to detonate.

You can check the sensor with another device called an oscilloscope. It will allow you to study the signal more qualitatively.

The advantage of using this device is that it does not require removing the sensor from the engine. You just need to connect the device and start the car.

If the sensor detonates, then it is working, and the breakdown must be looked for elsewhere. But if the knock sensor signal is low or there is no signal, then this is a malfunction.

You can determine whether the sensor is broken without a dashboard. But this will require experience and a special approach to your car. You need to know him very well. We list the signs by which you can understand that the device is broken, from here it will be immediately clear what the knock sensor affects:

Fuel efficiency will drop. This may not be noticeable right away, but over time the driver will definitely notice it.

How much does a knock sensor cost for a VAZ 2114?

On VAZ 2114 cars of early production years there is a Lada sensor 21120385501001. It has an extremely low prevalence and because of this its price is high and amounts to 800-1300 rubles. The only commonly found analogue is General Motors 21120-3855010-01 with a cost of 1600-1800 rubles.

The original broadband DD has article number 21123855020. Its price is much lower and amounts to 100-160 rubles. Its good analogues are presented in the table.

Table - Good analogues of the original VAZ 2114 knock sensor

Where is the knock sensor located on a VAZ 2112 16 valves

VAZ 2110Where is the knock sensor on the VAZ 2112 16 valves

Car: VAZ-2112. Asked by: Mikhail Kashin. The essence of the question: Where is the knock sensor of the VAZ-2112?

Hello dear editors! Help me solve my problem! I have a VAZ-2112, with a 16-valve engine. And recently I began to notice that the car twitches and loses power when accelerating, while at idle I observe unstable speed and a slight “triple”. I was told it was the knock sensor. Where can I find it and what does it look like? Tell me and help me with this question.

Looking for a knock sensor together

The knock sensor on the VAZ-2112 is located on the front of the engine, next to the oil dipstick, between the second and third cylinders.

Wide-band type knock sensor.

In order to dismantle it, it is necessary to remove the power supply and, depending on the type of sensor, unscrew it with a key “13” or “22”.

Installation is carried out in the reverse order, similar to removal.

What is a knock sensor used for?

The most important function of the knock sensor is adjusting the ignition timing, as a result of which detonation is extinguished. Because it is the ignition timing that plays a very important role in the stable and smooth operation of the entire engine.

We have already written in more detail about the functions of all sensors on 16-valve engines here.

For example, if the ignition is delayed, the car immediately loses acceleration, premature overheating begins, and fuel consumption increases significantly. With early ignition, power also decreases, the engine begins to “knock”, and this can lead to burnout of valves and their replacement.

Therefore, the long-term operation of the engine as a whole directly depends on the serviceability of such a small part as the knock sensor on the VAZ-2112.

Sensor type

Wideband knock sensor is a very rare beast on the VAZ-2112

You can replace the DD (knock sensor - approx.) with your own hands within 10-15 minutes, without resorting to the help of car services and workshops. However, first you need to know what type of sensor is installed on your engine. It comes in two types:

Wideband at the bottom, and resonant at the top.

• Wideband (in the picture below) - capable of recording and signaling absolutely the entire spectrum of noise, after which this signal is processed and the operation of the engine is corrected.
• Resonant (in the picture above) - the functions of this type of sensor are generally similar to the broadband one, however, it sends a signal for adjustment when detonation occurs.

Please note that these two types of sensor are not interchangeable, not only because they are different in appearance, but also because they differ in the type of signals. Therefore, before purchasing a new sensor, you should know what type you have installed.

Checking the functionality of the sensor

It happens that the sensor fails due to the presence of traces of corrosion on it. In this case, you should clean the case with sandpaper and check the functionality with a multimeter.

The check is carried out as follows:

1. Using a multimeter, we connect the wires to the two contacts of the broadband sensor (in the case of a resonant one, the negative wire is connected to the body, and the plus wire is connected to the center of the sensor - approx.).
2. Then, using a screwdriver or any other metal object, we apply small blows to its body.

THIS IS INTERESTING: Signs of a faulty knock sensor on a VAZ 2110

Functional knock sensor.

Depending on the force of the impact, the values ​​on the screen of the measuring device should fluctuate between 40 and 200 MV if the sensor is working properly. And if it is broken, the value will be “0”.

If during measurements it is established that the sensor is working, a further cause of the malfunction should be sought in the wires. The pad may need to be replaced, because it is the one that is exposed to strong environmental influences, as a result of which the contacts on it rust.

carfrance.ru

Replacing the knock sensor on a VAZ-2112 16 valves: photos and videos

The VAZ-2112 knock sensor is located under the hood. This is a device designed to determine the moment of detonation in an engine. Replacing this element is quite simple and any car enthusiast can handle it, so the process itself will take little time and effort. Separately, it is worth paying attention to the causes of breakdowns and their consequences.

on replacing the knock sensor on front-wheel drive VAZ cars of the 2110-2112 family:

The material will tell you about replacing the sensor, give recommendations and advice, and also tell you about the reasons for the effect.

Knock sensor replacement process

The location of the knock sensor is indicated by an arrow.

Before you begin the actual process of replacing the knock sensor on a 16-valve VAZ-2112, you should find its location. It is located on the cylinder block on the dipstick side.

There are two types of knock sensors:

1. single contact,
2. and two-pin.

Knock sensors that were installed on the 1st and 2nd generation 2112

Let's consider the replacement process in both options.

Replacing a single-pin knock sensor:

1. Disconnect the power supply.
   Disconnect the sensor from the network power
2. Using a 22mm wrench, unscrew the sensor.
   Unscrew the sensor
3. We are dismantling.

Replacing a single-contact knock sensor (called broadband):

1. Disconnect the power wires that go to the sensor.
   Disconnect the power supply from the sensor
2. Using a 13mm wrench, unscrew the fastening nut and remove the washer.
   Using a 13mm wrench, unscrew the sensor.
3. We dismantle the sensor.
   Remove the washer and dismantle the sensor

Once the sensor is unscrewed, you can diagnose it. To do this, use a tester to check the contacts of a working sensor; the voltage pulse varies within 40–200 mV.

Sensor selection

2112-3855020 is the original catalog number of the knock sensor. But, when choosing, you should ask the seller if it is single-contact or two-contact. In this case, it is worth knowing exactly which one is installed directly on the car. The average cost is 450 rubles.

Along with the original, there are several substitutes that can be installed on a car. Let's consider all possible options:

• 2112-3855020 DK – part made in China. The quality of the product is considered average, but as practice shows, it holds its resource no worse than the original. The cost is about 150 rubles.
• Fenox SD10100O7 is a more reliable sensor than the original. As most motorists advise, this is the product that needs to be installed on the 12 VAZ model. The market price will be 600 rubles.
• Era 550489 is another product that is recommended for installation on a car. This is a middle option between China and an expensive sensor. The cost is 370 rubles.

Causes of malfunction

Before considering the causes, it is necessary to look at the symptoms of the malfunction. So, what could be a warning sign that the knock sensor has failed:

The direct cause of sensor malfunction is simple wear. It, like any other car part, cannot last forever.

Using a tester, we check the sensor

conclusions

Replacing the knock sensor on a 16-valve VAZ-2112 is easy, both in the case of a single-contact and two-contact connection. Therefore, every car enthusiast can independently carry out this type of repair.

carfrance.ru

Signs of malfunction of the knock sensor VAZ-2112 16 valves

The knock sensor on the 16-valve VAZ-2112 has the same causes of malfunction as some GAZ, Toyota, Gazelle, Priora and Kalina cars. Of course, not every motorist will be able to determine that this is exactly the sensor, but you can consider the direct and indirect causes of the malfunction.

Source: https://motorsmarine.ru/vaz-2110/gde-stoit-datchik-detonacii-na-vaz-2112-16-klapanov.html

How to check the knock sensor of a VAZ 2114

Before replacing the knock sensor with a new product, there are several recommendations for checking its performance, as well as identifying the reasons for the incorrect operation of the device. If on 8 valve engines access to the product is quite free, then on sixteen valve engines you will have a little more difficulty. To check the functionality of the sensor itself, you can resort to two available methods:

• checking with a multimeter;
• Testing operation without removal.

How to check the knock sensor of a VAZ 2114 with a multimeter

To check the knock sensor of a VAZ 2114 with a multimeter, follow these steps:

1. We dismantle the sensor (how to do this is written in the next section of the article);
2. We connect the multimeter probes to the DD contacts (if it is two-contact), if it is single-contact, the first probe to the wire, the second to the device body;
3. We switch the tester to voltmeter mode and set the upper measurement limit to 200 mV;
4. Tap a screwdriver (or any metal object) on the sensor body;
5. If the device is working properly, the multimeter will show voltage surges, the magnitude of which should be directly proportional to the force of the impact (this indicates that the device retains the ability to convert mechanical energy into alternating current). If the multimeter readings do not change, the DD does not work.

If you find out that the device itself is working properly, but DD errors are displayed on the on-board computer or the car is not working as it should, the problem is most likely in the oxidized contacts of the sensor. Treat them with WD-40 or a similar solvent, install the DD in place and check the result. If that doesn't help, replace the knock sensor.

How to check the VAZ 2114 knock sensor without removing it

The second method, without removing the knock sensor on the VAZ 2114, is as follows. First, you must start the car engine and maintain its speed in the range from one and a half thousand to two thousand.

At the same time, you need to find the sensor and freely reach it. After that, take a convenient metal tool or device, knock on the part several times with increasing force (the main thing is not to overdo it). If the device is in good working order, the engine speed should increase when tapping (remember the principle of both operation and adjustment by the ECU). If after tapping no reaction occurs, you should dismantle the sensor and check it thoroughly with the same multimeter.

In any case, it is recommended to carry out a visual inspection of the product itself and pay attention to the following features:

• tightness of sensor mounting and connection;
• the degree of corrosion and contamination on the device body;
• contact connection (over time it may oxidize and partially or completely lose conductivity).

Removal

You can determine signs of a malfunction of the knock sensor on a VAZ 2110 by dismantling the device and performing certain manipulations with it.

Installation location

But first you need to remove the device.

• The knock sensor is located on the left of the power unit, where the line of the middle of the cylinder blocks is located. You will see an air filter in close proximity to it. Many people focus on this when searching for a sensor.
• De-energize the vehicle by removing the terminal from the battery.
• Disconnect the contacts from the sensor and the wiring block. A special lock will allow you to do this if you press it.
• Now unscrew the nut securing the device.
• All that remains is to remove it from the pin.

Let’s say right away that when reinstalling, you won’t be able to use a regular wrench. Arm yourself with a special torque tool and use a clamping force of no more than 20 Nm.

Replacing the knock sensor on a VAZ 2114 - step-by-step instructions

Replacing the DD is an extremely simple process. You can change the knock sensor of a VAZ 2114 within 5 minutes; for this you only need a 20 or 13 socket wrench (depending on what specific type of sensor is installed on your fourteenth).

So, after receiving a large block of theoretical information, we will proceed to practical exercises and thoroughly analyze the entire process of replacing (removing) the sensor.

Instructions for 8 valve engine

To perform the work you will need a 13mm wrench or socket.

1. We gain free access and unscrew the fastening nut.

2. Then disconnect the contact wires from the device connector.

3. We extract the part.

Reinstallation is carried out in the opposite sequence. Everything is quite simple.

Instructions for engine 16 valves VAZ 2114

We use the same tools as in the first case. The only addition is the need to remove the internal combustion engine protection and ensure a convenient position and access under the bottom of the car. To do this, you can place the car on an overpass or repair pit. The removal and installation process is similar to the first example.

Methods for checking a knock sensor

If there are signs of a malfunction of the knock sensor, then first of all you need to check the error log in the on-board computer. About DD malfunction they say:

• code 0325, indicates an open circuit in the sensor circuit;
• code 0326 or 0327, reports low signal level;
• code 0328, the amplitude of the voltage coming from the sensor is too high.

You can indirectly check the DD by checking the resistance with a multimeter. For a working sensor it ranges from 1 to 10 MOhm.

You should also check the voltage with a multimeter. To do this, the probes are connected to the contacts, and light blows are applied to the working surface of the DD with a bolt or rod. If there are no voltage surges, the sensor needs to be replaced.

Measurements

Now you can check with a multimeter set to the minimum value. If the sensor is single-contact, then the negative wire of the multimeter (it is usually black) is connected to the place where the mounting bolt is installed, and the positive wire (usually red) is connected to the signal contact in the connector.

Checking the two-contact sensor is carried out by connecting the multimeter wire to the corresponding contact “-” to “-”, “+” to “+”. Further actions are identical. To activate the sensor, you need to tap it with something not very hard (for example, a screwdriver).

If there are no faults, voltage surges will be observed. Approximately 40 to 200 mV. In addition, it would not hurt to check the internal resistance, which should tend to zero. If you find that the sensor is fine, then look for an open circuit. In this case, the best advice is to replace the entire block with wires.

If the resistance is different, or there are no voltage surges, it means that there is something wrong with the sensor itself and it needs to be replaced. The new one is installed in the reverse order of removal.

Checking the serviceability, maintenance and replacement procedure for the VAZ 2110 knock sensor

The principle of operation of a device such as a knock sensor is similar on all modern vehicles. This device is quite reliable and consists of a homogeneous monolith with an integrated special plate with a piezoelectric element, which responds to shock at the desired frequency. It is this wave action with a certain frequency that is formed in the cylinder block of a power plant during combustion of the air-fuel mixture.

The electrical current with a voltage of several millivolts, which appears as a result of this influence, serves as the source of measurements that are fed to the car's on-board computer. And the electronic system of the vehicle adjusts the ignition timing, neutralizing with these actions possible shock effects that occur during fuel detonation.

Despite the fact that the VAZ 2110 knock sensor, the price of which is quite reasonable, has small linear dimensions and is very simple in design, its importance can hardly be overestimated. After all, the loss of the switching signal from this product leads to the display of the corresponding failure code on the display of the on-board computer, which is deciphered in the VAZ 2110 as a knock sensor error and leads to the transfer of the ECU to a safe operating mode.

This, in turn, optimizes the software costs of the electronic control unit, adjusts the ignition timing to a minimum value, which leads to an increase in fuel consumption and a decrease in the dynamic power of the car.

If the knock sensor breaks, the vehicle is operated for a certain period of time without this setting. The same applies to the case when faults are identified in the knock sensor, but it is not possible to replace it. In any case, there is no point in delaying repairs or replacement of this device.

Useful tips

Recently, cases of selling defective spare parts and sensors without the necessary internal contents have become more frequent. Therefore, immediately after purchasing the product you need, it is recommended to check its performance with a multimeter. You should know that on older VAZ 2114 models the knock sensor (resonant) differs from modern products (broadband) in price, design features and operating principles. Therefore, you should buy a product that is designed specifically for your car model. A device with a resonant type of operation cannot be replaced by modern products without modifying the ECU.