The coolant temperature sensor is installed on all injection vehicles VAZ 2110, 2111 and 2112 in close proximity to the thermostat. It is this sensor that is responsible for triggering the radiator cooling fan when the temperature approaches the required value.

It should not be confused with another temperature sensor (DTUOZH), which only transmits information to the instrument panel.

As for its purpose, in addition to turning on the fan, it has many functions that relate to the ECM. For example, during a winter start-up, when it is -15 degrees outside, the sensor sends a certain signal to the ECU and it sends more rich mixture to the injectors. Moreover, this sensor seems to replace the “choke” function that was on carburetor cars, only here everything happens automatically:

• If the temperature is low, the engine speed increases
• As it warms up, the idle gradually reaches its optimal values ​​of about 800 rpm

In order to replace the coolant temperature sensor on a VAZ 2110, you will need a minimum of tools:

• Even one key for 19 may be enough
• It is more convenient to do this using a deep head and a ratchet handle.

The visual location of this part is shown in the photo below and marked with an arrow.

To make the process of removing and installing the sensor more convenient, it is advisable to disconnect the housing pads air filter, and take him aside. This is clearly demonstrated below.

The procedure for replacing the DTOZH on a VAZ 2110-2112

First of all, disconnect the negative terminal from the battery. After this, pressing the latch, disconnect the power plug from the sensor. The result is shown in the given picture below.

Before unscrewing the sensor, it is worth keeping in mind that the engine must be cool to avoid getting burned. Or you need to do it first

But I personally did everything on a cold engine, so I didn’t drain anything, and when unscrewing I just quickly closed the hole with my finger. As for unscrewing, a deep head with a ratchet is perfect for this task:

And as I said above, close the hole with your finger for a few seconds:

You need to have a new sensor on hand and immediately screw it into place. The maximum loss of coolant can be no more than 10 ml, if everything is done quickly, or even less.

Replacement is carried out with the same part with the same catalog number. In the next articles we will look at fault diagnosis and do-it-yourself testing. The price of a new DTOZ for cars of the tenth family is about 150-200 rubles.

Display “ Check Engine” is a headache for most VAZ 2110 motorists. Smart electronic system hints that there is a problem with your engine. Great, you read error codes using the self-diagnosis mode - you know how. And they tell us that the temperature sensor on your VAZ 2112 car has failed. Which sensor, what to do with it - we need to figure it out.

Let's start with the fact that the temperature errors that we can get are as many as six from two independent devices. And if one of these sensors monitors the coolant temperature, then the second sets the air flow for normal internal combustion engine operation. But what’s much more important is that without the normal operation of both the first and second, you won’t get far in your VAZ 2110.

It turns out that if you don’t want to end up in the middle of the road with open hood, from where coolant brought to a boiling point smokes, as if from a steam room, you need to control the temperature regime of the VAZ 2110 engine. Naturally, gasoline consumption with the above-mentioned temperature errors is not optimal.

Temperature sensor and its varieties on the VAZ 2110

To ensure that your car's systems work properly, modern engines VAZ type injector exists smart system electronic control, which reads information from various types of systems and warns you about possible malfunctions. When they talk about a temperature sensor problem, they most likely mean the coolant temperature sensor (CTS).

Errors related to malfunction temperature meters can also be caused by a sensor that determines the mass air flow (MAF). Thus, there are two types of temperature controllers in VAZ 2110 cars, not to mention those installed in the cabin for comfortable climate control. But the reliable operation of your iron horse, therefore it is not considered within the scope of this article.

The principle of operation of the temperature sensor on the VAZ 2110-2112

Despite the fact that a failed temperature regulator is not an element that can be repaired, it would be useful for the inquisitive mind of a modern motorist to understand the principle of its operation. As with any system, understanding the basic principles of its operation is the key to reliable service and repair.

If we talk about the VAZ 2110 temperature sensor, which controls the degree of heating of the coolant, then its design is extremely simple. In principle, it is a temperature-dependent semiconductor resistive element. The stronger the temperature effect on it, the lower its ohmic resistance.

This sensor has two contacts. The current level in the circuit is read by the ADC of the controller, which converts it into a digital value. Thus, having on-board computer, the motorist can also read in real time the dynamically changing operating temperature of the internal combustion engine on a VAZ 2110.

The mass air flow regulator, which includes two temperature-controlling elements and a resistive heating element, works much more interestingly. The temperature difference generated by the first and second sensors during operation, respectively, determines the flow rate of air passing through the filter to the engine.

The first of the meters is cooled by the incoming air flow, but the second is not. This is the principle of operation of the mass air flow sensor. This means that if both sensors show the same temperature, there is no air flow. And the greater the difference, the more intense the air flow passing through the control device and, accordingly, the greater its volume per unit time.

Possible problems of the TOZh and MVR sensor on the VAZ 2110-2112

The meter, which determines the degree of heating of the coolant, is an extremely reliable element. However, it has very characteristic malfunctions:

• loss of contacts in electrical connector, inside the sensor or in the connection diagram;
• problems with the insulation of the device, defects in the insulation of the plug connector, short circuit.

It is quite simple to understand that the temperature sensor of the VAZ 2110 is faulty, because through a logical controller it controls the operation of the fan, which turns on when the internal combustion engine is sufficiently warmed up. Accordingly, based on erroneous or missing information received from the regulator, the controller may make incorrect decisions, causing engine overheating or excessive fuel consumption due to difficulties in reaching normal temperature conditions.

Problems with the mass air flow meter can be determined by the corresponding “Check Engine” indication on the dashboard VAZ 2110 and characteristic signs of malfunction:

• the car noticeably loses power and at the same time consumes much more fuel;
• your car now accelerates and starts poorly when the engine is warm.

If you have any doubts about the operation of the MRI sensor, simply disable it. If after this the car’s performance has stabilized somewhat, the problem is definitely in the incorrect fuel consumption parameters set by the regulator. This does not mean that you can drive without it at all, since gasoline consumption in this mode, which is an emergency mode, is also not optimal.

We start the self-diagnosis mode, read the error codes of the temperature sensor

Being extremely simple, the operation will help you correctly determine possible problems with the car based on the information that the electronic microprocessor controller receives from sensors.

1. While holding down the daily mileage reset button, turn the ignition key. You can check the functionality of all elements of the dashboard.
2. Press the reset button again twice, thereby skipping the information about the firmware version, we can observe error codes. By holding down the reset button, you reset the error values ​​for re-diagnosis and verification of troubleshooting.

List of error codes issued that indicate a malfunction of the temperature sensor:

Codes 0112 and 0113 identify problems with the MVR associated with low and high temperatures, respectively. Don't rush to buy a new sensor. Since the element is an ordinary thermistor that changes resistance values ​​depending on temperature.

It is very easy to check it with a multimeter by removing it from the VAZ and immersing it in water brought to the boiling point, measure the resistance as the liquid cools and compare it with the table values. If everything is normal, the problem may be caused by a clogged sensor or contacts.

Codes 0115 and 0116 indicate that the coolant regulator readings are incorrect. This may also be due to sensor failure, short circuit, or other problems discussed earlier in the article.

Codes 0117 and 0118, finally, indicate that the temperature recorded by the VAZ 2110 TOZH meter is outside the normal range. A seven on the end means the values ​​are too low, and an eight on the end means they are too high. In this case, it is worth checking the entire cooling system, including the regulator itself.

Replacing the coolant heating sensor on a VAZ 2110-2112 and checking the old one

The procedure for replacing the DTOZH is extremely simple and does not require a visit to the service station. It is much easier and more reliable to do the work yourself. We remind you that before purchasing, you can check the condition of the old meter by simply immersing it in boiling water or, even better, coolant.

When monitoring the temperature of the cooling water, simply compare the sensor resistance values ​​with the table ones:

• at normal temperature environment, the meter removed from the car should show a resistance value of 3.5 kOhm (at 20 degrees Celsius);
• immersed in boiling water, the VAZ 2112 temperature sensor will produce a resistance value of 177 ohms;
• at the reference mark of 80 degrees. in Celsius, the regulator resistance should be 332 Ohms;
• Having cooled to a temperature of 40 degrees, the sensor will show a resistance value of 1.5 kOhm.

The algorithm for replacing the DTOZH is as follows:

1. Disconnect the negative terminal of the battery and drain the coolant from the system using the drain plug on the radiator.
2. The sensor is located on the inlet pipe of the VAZ 2110 radiator. To remove it easily, you will need to remove the filter.
3. Disconnect the electrical connector and unscrew the regulator from the system.

We buy a new sensor according to the factory nomenclature. Product catalog number 2112-3851010. It can also be found by its article number: 423.3828, 23.3828 or 405213. All of the above regulators are similar and interchangeable. A new meter costs about 250 rubles.

Replacing the temperature sensor on the mass air flow sensor

The above error codes 0115 and 0116 mean that the problem is only in the mass air flow sensor temperature meter. It is enough to check its performance in a similar way for DTOZH. The product is located near the air filter.

To extract temperature sensor— just disconnect it from the electrical connector. First disconnect the negative terminal of the battery. After replacing the sensor, if it was the problem, the “Check Engine” indication should disappear after four normal engine starting cycles.

Sometimes on the highway you see this picture: it’s worth a car with the hood raised, from engine compartment Steam rises, and a car enthusiast runs around the vehicle, sometimes the passengers of the car along with him.

The situation is, in fact, quite banal in its essence. There can only be two reasons: vehicle The engine temperature sensor has failed, or the driver has overlooked a sharp increase in its temperature. As a result, the engine overheated, the coolant exceeded the boiling point and turned into steam, the driver opened the radiator cap to reduce the temperature, and steam began to escape under pressure through this hole. This is also fraught with the risk of getting burns if an inexperienced car enthusiast opens the radiator cap carelessly.

How to prevent the possibility of such a situation occurring? The first thing is to be careful while driving and observe the instrument readings, as well as monitor the condition of the VAZ 2110 temperature sensor so that it does not fail.

What is a temperature sensor

This electronic device is an ordinary thermistor, i.e. a resistor that changes its resistance parameters depending on the surrounding temperature. Such a temperature sensor for the VAZ 2110, the price of which is relatively low, is integrated into the pipe on the cylinder head through which the coolant flows.

The main purpose of the engine temperature sensor is to control the temperature regime of the vehicle's cooling system and, if the temperature parameters increase to critical values, to generate a command electrical impulse to start the ventilation cooling system. After all, enrichment fuel mixture directly related to operating temperature power plant. The following logical chain can be traced - the lower the temperature range of the engine, the more enriched the fuel enters the injection system (carburetor) of the car.

Malfunctions of the temperature sensor "tens"

The temperature sensor is considered a fairly reliable element of the automotive system. The main defects include the following:

• loss of contact among components in the internal cavities of the product;
• defects in the wire insulation near the device with a freely hanging accelerator cable.

If the device fails to operate, there is an unauthorized switching on of the product on the engine, the temperature of which is not exceeded and, as a result, difficulties when starting the engine and increased fuel consumption.

Operating principle of the coolant temperature sensor

The thermistor, which is located in the internal part of the product, is characterized as an electronic device with the so-called. “negative indicator of temperature regime”, i.e. When heated, the resistance of the device decreases and, accordingly, when cooled, it increases.

An increased temperature range of up to 130°C reduces the resistance of the product within 70 Ohm +2%, and a lower limit at a temperature of -40°C increases the resistance to 107 KOhm ±2%.

The detector-controller passes a voltage of 5 V to the temperature sensor through a constant resistance located inside it. The controller determines the temperature values ​​of the coolant liquid by the potential difference across a temperature sensor with a variable resistance. On a cooled motor the voltage is high, and on a warm unit it is low.

When operating a device such as a VAZ 2110 injector temperature sensor, you should remember that the temperature regime of the coolant has a significant impact on many specifications, which are subject to control by the controller.

Replacing the coolant temperature sensor

In a VAZ car of the tenth model, replacing the temperature sensor is not a big problem. Replacement procedure:

1. Remove the negative wire from the corresponding terminal of the car battery.
2. Drain the coolant from the car radiator.
3. We dismantle the air filter for comfort during repair work.
4. We press out the plastic clip that holds the wire block from the temperature sensor.
5. We remove the product from the cooling system pipe.
6. Install the product in reverse order.

It is advisable to use the car temperature sensor of the VAZ “Ten” in accordance with the factory nomenclature of spare parts codes. This will ensure correct use of this product.

Surely every driver has seen this situation at least once: on the highway or on a city road there is a car with the hood raised, thick steam pouring out from under it. This problem is quite commonplace, and occurs in most cases due to problems with the coolant temperature sensor. In this article we will look at the basic principles of operation of the coolant sensor and tell you how to properly replace it yourself.

The video shows the process of replacing the coolant sensor on a VAZ-2112 in just 5 minutes:

An analogue of a foreign-made temperature sensor, the price starts from 800 rubles

In order to replace the temperature sensor, no special skills are required, you just need to strictly follow the following instructions:

Before purchasing a new sensor, you need to make sure that the part numbers between the old and new element are similar.

Temperature sensor malfunctions

When I see this photo, I immediately get scared. It's really scary. The temperature arrow is far beyond the red zone, severe engine overheating

When the temperature sensor fails, this happens. In this case, steam is released into the air through all possible openings.

Please note that the antifreeze (coolant - approx.) in the system is under pressure, and in order to avoid burns, the plug expansion tank should be opened very carefully. By the way, and rightly so, we think so!

The temperature sensor is considered a very reliable element of the VAZ-2112 engine systems, however, it has a couple of defects that, if they occur, will require replacing the sensor:

• The contact in the internal components of the part has disappeared.
• Breakdown of device insulation.

Operating principle of the sensor

This device is an ordinary resistor (thermistor - approx.), i.e. a device capable of changing its resistance depending on the temperature that surrounds it.

The sensor is mounted in the metal outlet pipe of the cooling system on the cylinder head through which antifreeze flows.

The purpose of this sensor is to monitor the temperature regime of the entire cooling system, and if the temperature rises, send a pulse to start. If the sensor is faulty, it will not give a signal in time, and.

The coolant temperature sensor or DTOZH on a VAZ 2112 car with a 16-valve engine performs the function of monitoring the state of antifreeze in the system. If the controller fails, the driver will receive incorrect data on the temperature status consumables. Read more about device replacement and malfunctions below.

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Characteristics of DTOZH

First, let's look at the main characteristics of the regulator, which is often called a fan switch sensor. Let's start with the operating principle.

Principle of operation

The design of the part is based on a thermistor-resistor, which changes the resistance level depending on the temperature conditions. The thermistor itself is installed in a steel case with a thread applied to it. Directly connected to the body is the rear plastic part of the device, which contains the contacts necessary for connecting the power wires. One of these contacts is positive and it comes from the ECU, the second is negative, which is connected to the body.

In order for the engine temperature sensor to operate, it is powered by a voltage of 5 volts. The voltage is supplied from the ECU through a constant resistance resistor. Since the DTOZh thermistor itself has a negative temperature coefficient, as the temperature increases, the resistance parameter on it will begin to fall. In addition, the voltage supplied to it will also decrease. As a result of the decrease, the ECU calculates the temperature of the power unit, and the corresponding readings are transmitted to the instrument panel. The regulator should turn on when the ignition is turned on.

Where is?

If you are the owner of a VAZ 21124, you will probably be interested in knowing where the coolant temperature regulator is located on a VAZ. On Ladas of the 12th family, the location of this device is quite simple - as can be seen from the photo, it is installed in the metal exhaust line of the cooling system on the cylinder head. The VAZ fan switch located here allows you to accurately determine the temperature of the consumable, since antifreeze passes through this line.

In what cases is it necessary to change?

If the VAZ temperature regulator breaks down, the consumables in the system will exceed the boiling point and, accordingly, the antifreeze will turn into steam. Ultimately, this leads to overheating of the power unit, and the steam itself will be released into the air through various holes in the system.

As you know, antifreeze is always under pressure, so if it begins to act up, the cap of the expansion tank must be opened as carefully as possible. Otherwise, the refrigerant that splashes out may cause burns on the skin. In general, the VAZ engine temperature controller is a fairly reliable part that fails relatively infrequently.

But, like any other device, such a regulator has certain defects that lead to its failure:

• the contact on the internal board of the device disappears;
• breakdowns appear in the insulation of the regulator (video author - Vasily Kalugin).

As for the main symptoms of a part failure, its failure can be determined by the following signs:

1. The fan does not turn on. As you know, the fan is activated when the engine heats up, and it can also turn on after the internal combustion engine is turned off. If the fan does not turn on, this may indicate not only a breakdown of the controller, but also oxidation of the power contacts. Therefore, first of all, it is necessary to diagnose the connection of the ventilation device and, if necessary, clean the contacts from oxidation.
2. Another symptom is that the engine stops starting normally, problems especially often appear when cold weather sets in.
3. When driving when not warmed up power unit the exhaust will be bad.
4. Another sign is the appearance of steam from under the engine, this already indicates its overheating.
5. The vehicle's fuel consumption may increase.

As practice shows, when such symptoms appear, replacement of the cooling system controller is usually not required. In fact, the problem is usually a poor connection or damage to the wires, in some cases it may be a refrigerant leak. So first you need to visually diagnose the device for defects or damage.

Replacement instructions

To replace the regulator at home, you do not need any specific tools or skills; everything is quite simple. Z Changes should be made when the car has cooled down to avoid getting burned!

Do it yourself as follows:

1. First, the car's electrical network is de-energized; to do this, simply remove the terminal from the battery by unscrewing the nut securing it with a wrench.
2. It is necessary to drain part of the consumables from the radiator device into a pre-prepared container. The container must be clean, since this antifreeze will be poured back into the system.
3. To easily replace the controller, dismantle the air filter housing. You don’t have to remove it, it will just be easier to replace it this way.
4. After completing these steps, you can dismantle the block with wiring from the controller power supply. Make sure that there is no corrosion on the contacts; if there is rust, it must be removed with an iron brush.
5. Then unscrew the regulator from the installation location; for this, use a 19mm wrench. Install a new sensor; before installation, make sure that there is a metal ring on its thread. In order to securely fix the regulator, it can be placed on a sealant. Further actions Assembly is carried out in reverse order.

Video “Visual instructions for replacing the controller at home”

You can learn more about how the process of replacing the sensor takes place using the example of the domestic “ten” from the video below (the author of the video is the Garage TV KR channel).