Faulty temperature sensor on the viburnum. Let's learn how to change the engine on the Lada Kalina on our own without hesitation. Purpose and principle of operation

Taras Kalenyuk

Reading time: 3 minutes

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The VAZ automobile plant began production of the Lada Kalina in the late 90s. New, modernized models are still being produced, however, the car still has many weak points, including the engine and suspension and even the coolant temperature sensor.

There is an opinion that the Lada Kalina was assembled according to the principle of “cheaper and more accessible.” This does not mean that the car is bad or not worth the money, on the contrary. Just when buying it, you need to understand that it is better to replace it immediately or be prepared to replace these parts. To understand whether it is worth changing the DTOZH, you need to understand it.

How does DTOZH work?

The coolant temperature sensor provides the cooling necessary for any engine. Of course, not himself, but he takes the necessary temperature measurements and transmits them to the on-board computer, which in turn regulates the engine cooling operation.

DTOZh is usually installed so as to come into contact with the antifreeze entering the engine. The antifreeze path is tortuous and follows the same route. It visits the engine, cooling it and at the same time heating itself. Then the coolant at the outlet of the engine passes through the radiator tubes, being blown by a counter flow of air and cooling. After cooling, it is again sent to the engine, where it is intercepted by a detector that measures its temperature.

If the temperature is shown above the permissible level, this will be a signal that the radiator cannot cope with cooling and needs help. It is the decision about help that the car’s ECU will make after receiving data on overheating. Additional fans will immediately start to cool the antifreeze.

In the event of a malfunction or absence of a sensor, the ECU will automatically decide on permanent additional cooling. Without its own “eyes” in the engine, it will be forced to always try to cool it, just to avoid overheating. As a result, all systems will wear out. The engine itself will begin to work worse. Stall. And fuel consumption will increase by about 15-30% of normal.

Obviously, the operation of the meter cannot be neglected, and in the event of a malfunction, it must be replaced immediately.

Monitoring operating parameters of DTOZH

We start with an external inspection, identifying corrosion and damage. But it’s easier and more reliable to immediately replace it with a new and working one.

To check functionality you need to stock up on:

• multimeter,
• thermometer,
• heat-resistant capacity of 0.5 l.

Preparation procedure

Everything is simple, but carried out very carefully:

• switch the multimeter to voltmeter mode,
• remove the block and wires from the DTOZH and start the ignition,
• connect the “-” probe of the multimeter to the “ground” of the motor, and the second one to the terminal of the block No. 1,
• output is energized from 12V.

Verification procedure

Not difficult, but

• multimeter in ohmmeter mode,
• pour water into the container at about 100°C,
• connect the multimeter probes to the DTOZh terminals and dip the latter’s working area in hot water,
• We take several measurements of the DTOZ in the gradually cooling liquid.

We compare the obtained data with what is given in the table. The discrepancy will show the degree of its serviceability.

If the discrepancies are all within normal limits, it means that the error in operation occurs due to poor contact, a malfunction of the computer, or a violation of the integrity of the wiring.

Don’t forget about timely change of antifreeze or antifreeze, and also that it is best to use the liquid offered by the manufacturer.

Taras Kalenyuk

Reading time: 4 minutes

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DTOZH on Lada Kalina, like on any other vehicle, performs its own special functions. They involve taking temperature readings from the coolant and then transferring them to the computer.

According to this data, the computer determines how much enriched fuel to send to the system, what speed to set the engine for optimal operation, and also determines the need to turn on the fans.

In a VAZ car of this model, the engine is equipped with two engines.

It is worth knowing the difference so that, if necessary, you do not confuse them with each other.

The first of them is the antifreeze temperature sensor itself. It is located in the area of ​​the thermostat and its sensitive element is immersed directly in the coolant.

The second sensor - the coolant temperature indicator - is located in the cylinder head and transmits data to the on-board computer.

The operation of both devices is important, and their failure can cause a lot of problems, especially if corrective measures are not taken in time.

The antifreeze heating detector makes it possible to monitor the following aspects of engine operation:

1. activation of fans when it is necessary to cool the engine;
2. adjustment of the ignition angle, thereby optimizing the composition of exhaust gases, which allows minimizing their harmful impact on the environment;
3. enrichment of the fuel mixture - equalizing the ratio of fuel to air, based on the level of engine heating.

The device that measures the temperature of antifreeze is a negative temperature coefficient mechanism.

What does it mean?

The operation of the thermistor is based on the conversion of thermal data into resistance numbers, which are smaller the stronger the heating of the antifreeze.

Knowing these principles, you can check the performance of the device yourself, having at hand only a thermometer with a sufficiently wide measurement scale and a universal measuring device (multimeter).

Signs of a DTOZ malfunction are easy to recognize, but it is worth knowing that they do not always indicate a breakdown of this particular sensor. These failures may indicate a breakdown of the engine ventilation system, damaged wiring, or damaged contacts.

Temperature sensor Lada Kalina

Replacing the temperature sensor

1. disconnect the block of wires going to the sensor from the control system, and then unscrew the device itself using a key of a suitable size (on Kalina this is usually 19);
2. install a new one in place of the removed device and carry out the assembly in the reverse order. It is worth considering that some detectors may have weak threads. This can be easily compensated for if, when installing the DTOZH, a seal is used that will prevent antifreeze from leaking through the gaps in the detector socket;
3. fill in the coolant, connect the battery, start the engine and make sure that the repair was successful and the system is working properly.

Kalina 2

Lada Kalina of the second version, by and large, differs from its predecessor only in complete restyling. The exterior has undergone many changes as well as the interior design, but the interior has remained the same. “Kalina 1 temperature sensor” remained in its place, although it was supplemented by a fellow from the salon, proudly calling itself “Kalina 2 temperature sensor”. It came along with a new air conditioning system.

Lada Kalina second version

In general, the new car claims to be a class of car higher than its predecessor, and in terms of comfort we can say that the claim is justified. Inside, Kalina 2 has the usual 8 and 16 valve engines. The presence of the same number of valves in the predecessor does not yet cause alarm, but suspicions begin to creep in.

Further more, the same rear drum brakes, stiff suspension, problems in the cabin. However, there are also many corrected problems with Kalina 1. As for the sensors, there is almost complete interchangeability between Kalinas.

As a result, if you decide to replace the first version of the car with the second, but only recently purchased a new high-quality part for it, do not rush to get upset about it. It will almost certainly fit a new car when the time comes.

Troubleshooting and repair

The first signs of trouble will be:

1. problems with cold starting the car;
2. the engine stalls periodically;
3. fuel consumption increased;
4. The temperature alarm indicator is on;
5. Inadequate temperature readings on the dashboard.

When faced with one or more problems from the list, you need to understand what the reason is in more depth. Having opened the hood of the Lada Kalina, you should inspect for coolant leaks. One of the main reasons for a malfunction of the meter may be an insufficient level of antifreeze or its leakage. After making sure that there is no leakage, additionally make sure that the antifreeze level is as required; if there is a deficiency, add fluid.

The next step is to check the contacts and electronic circuit. Over time, the wiring wears out, the contacts rust and oxidize. They might even get dirty. It is necessary to clean them and make sure that the electronic circuit is working properly.

Only after the first two steps of the initial inspection can you begin to inspect the meter itself.

In Kalina, as in many Vases, the detector is installed on the thermostat. However, it is worth considering that it has two DTOZH installed at once. One is associated only with the dashboard and is informative. The other is connected by an electronic circuit to the ECU, and it is the main one.

Dismantling and inspection are carried out as follows:

• first of all, it is necessary to turn off the power to the vehicle and drain the coolant, only after this can you begin direct dismantling;
• then disconnect the connecting wires from the meter. Inspect them and clean them;
• unscrew the sensor itself, you may need a deep head for this;
• After removing the detector, clean it and check its operation. This is usually done by immersing the sensor in a glass of water, then heating it, then cooling it and measuring the resistance of the meter;
• if the old sensor malfunctions, you must buy a new one, since it cannot be repaired;
• Installation of a new or old working device is carried out in the reverse order of its dismantling. Remember that the sensor must have a sealing ring (if it is an old meter, purchase a new seal for it); in addition, you can use sealant;
• check the operation of the device when the car is running, and also make sure that antifreeze does not leak while the system is running.

Coolant temperature sensor on Kalina

The content of the article

General information

Any experienced motorist will immediately answer the question of what a cooling sensor is. But, if you're just starting out on your driving career, it's a good idea to understand some basic information first.

How does it work

Cooling the system is the key to the proper operation of your car, and this controller helps prevent malfunctions from occurring. The coolant temperature sensor has another name - coolant. This small part is responsible for performing serious functions, namely:

• setting the ignition;
• enrichment with gasoline;
• recording changes in closed and open loop conditions.

The operation of the engine as a whole depends on the operation of this sensor. If it functions properly, then the electronic control unit receives reliable information, which helps to adjust the operating mode and prevents unnecessary fuel consumption.

The very first rule is to take care of your car and undergo a timely inspection. If you are a responsible driver, then the temperature sensor in the Lada Kalina, like other systems, will work properly. But situations often occur when devices suddenly fail. How to determine that it is time to organize a check of the cooling systems?

Main features

The coolant temperature sensor shows how hot the coolant is. Therefore, the first thing to do is conduct a visual inspection. It is worth paying special attention to the wires and their connections, since it is in these places that small breaks most often occur, which lead to malfunctions. Even small doses of rust can be an indication of problems in operation. This is the first sign of a future possible breakdown.

In addition to inspection, you should not lose sight of other “symptoms” of damage to this element:

• difficulty starting the engine, its unstable operation, sudden stop;
• increased fuel consumption;
• overheat warning via warning lamp;
• high consumption of antifreeze.

If you have sufficient experience in operating a car, you can check the functionality of the sensor yourself. If you are a beginner or are simply afraid of doing something wrong, contact any car dealership, where they will help you identify and fix problems, if any, in a short time.

Replacing the device

Sooner or later, everything falls into disrepair, and the coolant sensor in the Lada Kalina also faces the same fate.

If any problem does occur, the device cannot be repaired; it is simply replaced. But don’t worry about this, this procedure is not complicated, it can be done independently, or you can turn to professionals for help.

If you are sure that the problem is with the coolant sensor, proceed with replacement. First you need to drain the coolant, then remove the air filter. Next, the plastic clip opens and the sensor harness connector is separated.

After this, the element can be easily removed from the thermostat housing. Installing a new device occurs the other way around: the element is first screwed into place where it should be, and only then fixed with all the clamps.

The latest thing is to replace the antifreeze.

Naturally, when performing actions, you must follow all safety rules and be careful not to harm your property or yourself. As you can see, the procedure is actually not complicated, but if after it there are malfunctions in the operation of the car, and the engine in particular, it is worth contacting a service station and completely checking other systems.

general information

The coolant sensor on the Lada Kalina is screwed into the thermostat. It is not difficult to detect; its location is the same for many VAZ cars. The sensor that transmits readings to the device is located nearby. A wire comes from it that requires replacement if it breaks. Locating the engine temperature sensor is not difficult. It's hard to detect if it's broken.

The elements themselves last for a long time. However, when installing a low-quality device, its service life is significantly reduced. The new sensor may fail after a couple of months. It must be replaced if there is no response from the device. This is not difficult to notice; the arrow just lies there and does not show any data. The second symptom is increased fuel consumption.

If deviations occur on the part of the cooling element, it is recommended to monitor how many liters of antifreeze are “leaving” and how quickly.

Before making a replacement, you need to make sure that the problem lies in the sensor. The first step is to drain the coolant. To eliminate dangerous situations, it is necessary to disconnect the wires from the minus terminal. Naturally, this is done on a battery. The liquid is partially drained, then it is refilled. It could be antifreeze or antifreeze.

To facilitate replacement on Kalina 2, it is necessary to remove the air filter. It does not pose any danger and is removed solely for convenience. Then the plastic clamp is wrung out and the harness connector is disconnected from the sensor. Next, the element is unscrewed from the thermostat housing. Using an ohmmeter you need to measure its resistance.

If it does not match the engine temperature, it must be replaced.

The new element is installed in the reverse order. After which the antifreeze is replaced. The procedure is simple, you can do it yourself. If there is no positive result, you must go to a service station. It is possible that Lada Kalina has experienced additional problems.

There is no need to delay replacing the element. Violations in its operation provoke problems with the functioning of other vehicle systems. It is worth noting that replacing antifreeze or antifreeze is a mandatory manipulation.

Bottom line

DTOZH is not a detail that should be joked with or forgotten about. It makes sense to buy such a spare part immediately when purchasing a car. It is not expensive, but it saves significant amounts of money on excessive fuel consumption and repairs of a “tied” car.

The Kalina engine temperature sensor is needed for the operation of its entire system. If there is no spare part and the device breaks down on the road, it can be replaced with a counterpart that communicates with the dashboard. This temporary solution will allow you to get to the repair point without incident.

The main thing in the car is still the meter that communicates with the ECU. The second only keeps you personally informed of events. Although, given that in a critical situation it is the second one that can turn out to be a lifesaver, we should not forget about its timely replacement.

As a final recommendation, I would like to mention one more detail. Many people add ordinary or distilled water to the cooling system instead of a specialized liquid, believing that this way they cheat the system and save money. In fact, such people are only deceiving themselves.

Filling with distilled water is a last resort when there is no access to normal antifreeze. Even one-time use of such water already causes irreparable damage to the cooling system. Ordinary water tends to affect the mechanisms of the cooling system, cause rust in it, and form a heavy sediment in the pipes. All this clogs the system, spoils it, and ultimately kills. Always use only specialized coolant and remember to replenish its level promptly.

Since the late nineties, the domestic AvtoVAZ plant has been producing the Lada Kalina model. Today, having gone through numerous stages of modernization, it has entered a new stage of its development. Neat and aesthetic, practical and quite dynamic, this car won the hearts of a huge consumer audience.

No less criticism is caused by such a seemingly simple and insignificant device as the coolant temperature sensor. Here, the specified device most often fails, leading to other, more significant technical problems. What is the Kalina coolant temperature sensor, what are its features?

Based on the data displayed on the control unit, the driver can judge the effectiveness of the systems and take action. The sensor is a resistor that works by increasing or decreasing resistance associated with temperature fluctuations. As the temperature rises, the resistance decreases; when cooled, on the contrary, it becomes higher.

The air temperature regulator is usually located on the thermostat block; in rare cases, it can be seen on the cylinder head of the engine. In new cars there are even two measuring devices for reliability. The first performs the task of the responsible controller of the electronic system, and the second is responsible for the efficient operation of the fan.

Detecting a sensor malfunction and replacing it

Cracks in the housing cause coolant to leak, which is also bad. So, if Kalina’s control unit receives dubious information about the coolant level, if the engine begins to give unjustified failures and then completely stalls, if the engine suddenly begins to lose power and controllability while driving, in 80 percent of cases this may indicate sensor malfunction.

• at idle speed the engine is unstable, starting is difficult, stalling occurs;
• fuel consumption suddenly increases;
• The control lamp warns of overheating.

Radiator and coolant fill level. It is very important to know here that the radiator cap can only be removed when the engine has cooled down, otherwise it is easy to get a serious burn. The tightness of the lid should also be checked. If the cover is not sealed, then air enters the system, which leads to overheating of the motor and, as a result, distorted sensor data.

And lastly, it is necessary to monitor the performance of the fan, on which a lot also depends. To dismantle the Kalina DTOZh device, you must first disconnect the negative wire from the battery. Next, you need to drain all the coolant. The third step is to disconnect the wiring from the sensor. Now we arm ourselves with a 21 key and unscrew the device.

Such changes primarily affect the operation of the sensor, so in order to avoid possible difficulties and troubles, it is better to replace the device with a new one. In the event of emergency overheating of the power unit, problems occur with the sensor. Therefore, when repairing the Lada Kalina engine, do not forget to pay attention to the sensor.

Problems with d

The oil pressure sensor (OPS) manifests itself as a non-extinguishing oil pressure indicator, which is displayed on the dashboard. This light indicates that the oil level in the system is critical and the pressure is low. However, the reason may be something else, for example, the sensor itself may fail.

Signs of sensor malfunction

This sensor is considered to be very reliable due to its comparative simplicity of design. However, there may be problems with it too. Usually they come down to a violation of the calibration, which leads to a violation of the resistance and, as a result, incorrect operation of the electronic unit, since it performs part of its functions based on the engine temperature.

One of the most obvious signs of failure of this sensor is the failure of the fan to turn on when the temperature exceeds the set value. But this indicator will not be reliable if there are two sensors - the main one, for transmitting the temperature value to the electronic unit, and the additional one, responsible for turning on the fan. In this case, failure to turn on the fan will indicate damage, oxidation of the wiring, or failure of the sensor responsible for its operation.

How is DDM verification performed?

It is logical that the pressure is checked with a pressure gauge. You need to screw in the pressure gauge instead of the sensor, after which you should start the car engine. At idle speed the values ​​should exceed 0.65 kgf/cm2. This indicates normal blood pressure. If something does not correspond to the above figures, the oil pressure sensor needs to be replaced

.

If there is no pressure gauge, you need to remove the sensor and turn it with the starter without starting the engine. If at the same time oil begins to splash or pour from the socket in which the sensor is installed, we can conclude that the sensor is faulty.

Self-replacement of DDM

To do this, you will need a key to “21”.

1. Remove the decorative engine cover.

1. The Kalina oil pressure sensor
   is located on the back of the engine, it is installed on the right side of the cylinder head socket.

1. By pressing the pad clamps, it is necessary to disconnect the drive pad directly from the oil pressure sensor.

1. Unscrew the sensor with a key to “21”.

1. Prepare a new pressure sensor for installation and install it in the socket.

1. Clamp everything, put the wire block in place, and install the cover. All that remains is to make sure that the problem has disappeared (the light should go out in a couple of seconds).

On the cylinder head. On vehicles of the LADA 4x4 family, the sensor is installed on the outlet pipe.

Location of the coolant temperature sensor in the engine compartment of cars of the LADA PRIORA family (with the air filter removed): 1 - coolant temperature sensor

Location of the coolant temperature sensor in the engine compartment of cars of the LADA KALINA family (with the air filter removed): 1 - coolant temperature sensor

Replacement

The coolant temperature sensor is located in the thermostat housing; it is number 14 in the diagram.

To change the DTOZH with your own hands, you should:

1. Drain the coolant (car mechanics do not drain it);
2. Disconnect the connector with wires;
3. Unscrew the sensor (key “19”).

Installation is carried out in reverse order. To eliminate the leak, replace the copper washer or apply a heat-resistant sealant to the threaded part of the sensor.

Operating principle

The sensitive element of the coolant temperature sensor is a thermistor, i.e. a resistor whose electrical resistance changes depending on the temperature. High temperature causes low resistance, and low coolant temperature causes high resistance. supplies a voltage of 3.3 V to the coolant temperature sensor circuit.

The controller calculates the coolant temperature based on the voltage drop across the DTOZH. The voltage drop is relatively high when the engine is cold and low when the engine is warm. Coolant temperature is used in most engine management functions.

If a malfunction occurs in the DTOZh circuits, the controller enters its code into its memory, turns on the warning light and the cooling system fan, and calculates the coolant temperature using a special algorithm.

Engine management system

The VAZ-21114 engine uses a distributed phased injection system: fuel is supplied by injectors to each cylinder in turn in accordance with the operating order of the engine.

Checking the temperature sensor

If the sensor (art. 23.3828) fails, it becomes difficult to start a hot engine, and fuel consumption also increases. If you turn off the DTOZH completely, the controller perceives this as an open circuit in the temperature sensor and forcibly turns on the fan.

To start checking the DVT of a Priora or Kalina car, you need to know its technical staff. characteristics: the nominal voltage of the temperature sensor is 3.4V (±0.3), the voltage output at 15 °C should be from 92.1 to 93.3 V, and the resistance should be 4033 - 4838 Ohms; at 128 degrees 18.1 - 19.7 V and resistance 76.7 - 85.1 Ohms. This dependence of temperature and resistance is due to the fact that there is a thermistor with a negative temperature coefficient inside the sensor, therefore, when heated, its resistance decreases. That is, the controller calculates the coolant temperature based on the voltage drop across a sensor that has a variable resistance.

Table of dependence of DTOZH resistance on temperature

Checking the engine temperature sensor

To check the coolant temperature sensor in the engine of Priora and Kalina cars, you will need a multimeter with a resistance measurement limit set to 100 Ohm - 10 kOhm, a thermometer with a measurement scale of at least 100 degrees, as well as a bowl of boiling water and a table of the relationship between temperature and resistance of the coolant sensor. We connect the sensor terminals to an ohmmeter and place the DTOZH in boiling water, and as the water cools, we measure the resistance readings in the control temperature values, and then compare them with the tabular characteristics to draw a conclusion about the serviceability of the coolant temperature sensor in the car engine.

Checking the engine temperature sensor VAZ (Lada) Kalina 1117 2004-2013

Tool:

• Multimeter
• Thermometer
• Open-end wrench 10 mm
• Curved box spanner 19 mm

Parts and consumables:

• Coolant temperature sensor
• Coolant
• Water container
• Coolant container

The coolant temperature sensor is a thermistor whose resistance is inversely proportional to temperature. It is located in the thermostat housing and connected to the controller. By direct contact with the coolant, the sensor measures the operating temperature of the engine.

Dependence of sensor resistance on temperature.

Checking and replacing the temperature sensor

1. First, remove the negative terminal from the battery.

2. Partially drain the coolant using the special radiator drain hole, as described here.

3. We dismantle the air filter to get to the sensor, as described here.

4. Disconnect the wiring harness connector from the temperature sensor. To do this, you must first press the corresponding latch and then pull out the block.

5. Now you need to disconnect the connector from the sensor.

6. Next, we remove our sensor from the thermostat, for example, using a key.

7. Now you can start checking. To do this, we use a multimeter, a basin filled with water and a thermometer.

We place the sensor in water of different temperatures. We compare the results obtained with those presented in the table above. If the difference in performance is large, then we definitely need to replace the sensor with a new one.

8. As practice shows, the process of checking and replacing a temperature sensor lasts approximately half an hour if you have all the necessary tools prepared in advance. After finishing work, refill the drained liquid.

The article is missing:

• Photo of the instrument
• Photos of parts and consumables
• High-quality photos of repairs

Replacing the coolant temperature sensor

Removing DTOZH

1. Turn off the ignition.
2. Disconnect the wiring harness connector from the sensor.
3. Carefully unscrew the sensor (spanner 19).

Be careful when working with the sensor. Damage to the sensor may cause the engine control system to malfunction.

Installation of DTOZH

1. Screw the sensor into the thermostat housing (outlet pipe). The tightening torque of the sensor is 9.3…15.0 Nm
   (replaceable extended head 19, torque wrench).
2. Connect the wiring harness block to the sensor.
3. Top up if necessary.

Since the late nineties, the domestic AvtoVAZ plant has been producing the Lada Kalina model. Today, having gone through numerous stages of modernization, it has entered a new stage of its development. Neat and aesthetic, practical and quite dynamic, this car won the hearts of a huge consumer audience.

Now Kalina is one of the most sought-after and popular on the Russian market. But, of course, in addition to the advantages, the model also has a number of serious shortcomings. These include not the best suspension, which does not cope well with difficult roads, a vulnerable braking system, an engine whose power still leaves much to be desired, and much more.

No less criticism is caused by such a seemingly simple and insignificant device as the coolant temperature sensor. Here, the specified device most often fails, leading to other, more significant technical problems. What is the Kalina coolant temperature sensor, what are its features?

general information

Every modern car has a coolant temperature sensor. It plays an important role in the functioning of many systems.

In Kalina 2, this element is located in the thermostat housing. It was as if it had been screwed into it and then connected to the controller input. It, in turn, is connected to the main voltage source via a resistor. A low temperature indicator provokes a high resistance, an increased value - a decreased one. This is the principle of operation of the device.

The controller monitors the temperature of the coolant. This process is completely voltage dependent. When the engine is cold it is high, but when the engine is warm, on the contrary, it is low. The engine temperature affects many characteristics, the performance of which is controlled by the controller.

Thanks to this element, the control system performs the following functions:

• sets the ignition (its advance or retard);
• enriches with gasoline;
• captures changes in closed and open loop conditions.

The coolant temperature sensor monitors the volume of exhaust gases. Correct setting of the ignition angle guarantees its low amount. In this case, the operation of the motor is considered more rational.

Gasoline enrichment. At low temperatures, a pulse is instantly sent to the injectors, thereby eliminating fluctuations during engine overheating. This process ensures optimal engine operation at idle.

Changes and control under closed and open loop conditions. If the indicator breaks, pulses will come from the oxygen sensor, but they will not receive feedback. This will lead to poor idle performance. The operation of many vehicle systems is disrupted.

The role of the coolant sensor

Any engine needs a cooling system, since during intensive operation it is subject to severe overheating, and the temperature inside the housing sometimes reaches 250 °C. The cooling system is responsible for a small but very important electronic device - the coolant temperature sensor, or DTOZH. The device sends a signal to the electronic control panel about the state of the cooling system at a certain moment.

Based on the data displayed on the control unit, the driver can judge the effectiveness of the systems and take action. The sensor is a resistor that works by increasing or decreasing resistance associated with temperature fluctuations. As the temperature rises, the resistance decreases; when cooled, on the contrary, it becomes higher.

The device must be in coolant. If its level drops significantly, the sensor begins to produce incorrect data, causing all systems to fail in a chain reaction. This is why it is so important to monitor the fluid level to prevent technical problems.

The air temperature regulator is usually located on the thermostat block; in rare cases, it can be seen on the cylinder head of the engine. In new cars there are even two measuring devices for reliability. The first performs the task of the responsible controller of the electronic system, and the second is responsible for the efficient operation of the fan.

Operating principle of DTOZH

Complex processes of temperature and voltage fluctuations constantly occur inside the engine. When the temperature drops below the permissible level, an enriched mixture is required for normalization. If the scale rises above a certain mark, then, on the contrary, an enriched mixture can lead to catastrophic consequences for the engine. During normal operation of the DTOZh, all this data comes to the dashboard in an ideal format, becoming excellent hints of the car’s wishes addressed to the driver.

But in the event of a break, even the most microscopic one, in the sensor wiring, these measurements are already made in a broken format. As a result, when it is not needed, the system supplies an enriched mixture, which causes excessive fuel consumption in the engine. The power unit begins to work in an increased mode for wear and tear, the result of such work is a high percentage of harmful emissions into the atmosphere.

There is another situation when a short circuit occurs in the sensor, then such a pulse is perceived by the electronic control unit as obvious overheating inside the power unit. Adjusted to prevent overheating, the control system delivers a lean mixture. Since there is actually no overheating, a lean mixture causes the engine to run inefficiently, causing it to lose its power and stability. The result is breakdowns requiring repair.

Detecting a sensor malfunction and replacing it

Design of the cooling system of Lada Kalina 1 - expansion tank; 2 — radiator outlet hose; 3 - inlet hose; 4 - radiator; 5 — steam exhaust hose; b — radiator supply hose; 7 — electric fan; 8 — electric fan casing; 9 — coolant temperature sensor; 10 — coolant temperature indicator sensor; 11 — throttle assembly; 12 — bracket for the coolant pump pipe; 13 — coolant pump; 14 — coolant pump pipe; 15 — heater radiator supply hose; 16 — heater radiator outlet hose; 17 — exhaust pipe; 18 — coolant pump pipe hose; 19 — thermostat housing

To determine that the evaporator temperature sensor is faulty, you should first conduct a visual inspection, thorough and consistent. Particular attention should be paid to wires and their connections, since this is where microscopic breaks most often occur. In addition, rust deposits, even in minute doses, can lead to failure.

Cracks in the housing cause coolant to leak, which is also bad. So, if Kalina’s control unit receives dubious information about the coolant level, if the engine begins to give unjustified failures and then completely stalls, if the engine suddenly begins to lose power and controllability while driving, in 80 percent of cases this may indicate sensor malfunction.

Therefore, in order to determine the location of the breakdown, you should first check this device. In addition to these symptoms, the following signs indicate that the coolant temperature sensor needs repair:

• at idle speed the engine is unstable, starting is difficult, stalling occurs;
• fuel consumption suddenly increases;
• The control lamp warns of overheating.

You can determine whether the interior temperature sensor is working by checking the resistance and voltage. To diagnose, you need to remove the sensor, then lower it into a container of water, the temperature of which is alternately changed. In warm water, the voltage should vary from 3 to 1 W for 4-5 minutes. In addition to monitoring the sensor, other systems should be carefully checked.

Radiator and coolant fill level. It is very important to know here that the radiator cap can only be removed when the engine has cooled down, otherwise it is easy to get a serious burn. The tightness of the lid should also be checked. If the cover is not sealed, then air enters the system, which leads to overheating of the motor and, as a result, distorted sensor data.

It is important to check the chemical composition of the coolant. The manufacturer combines water and antifreeze in equal proportions, but if there is more of something (usually water), then the liquid will do not so much good as harm. You should not fill in outdated fluid that is more than 3 years old; it loses its technical properties and becomes useless.

And lastly, it is necessary to monitor the performance of the fan, on which a lot also depends. To dismantle the Kalina DTOZh device, you must first disconnect the negative wire from the battery. Next, you need to drain all the coolant. The third step is to disconnect the wiring from the sensor. Now we arm ourselves with a 21 key and unscrew the device.

Install the new one in the reverse order. Don't forget to fill the radiator with antifreeze at the end of the job. The temperature sensor is changed only as a last resort, when it is known for sure that it is faulty. Checking the device was discussed in the previous paragraph. But sometimes the sensor changes even in its functional state. When is this done? If it is necessary to completely overhaul the Kalina engine or replace it.

Such changes primarily affect the operation of the sensor, so in order to avoid possible difficulties and troubles, it is better to replace the device with a new one.
In the event of emergency overheating of the power unit, problems occur with the sensor. Therefore, when doing repairs, do not forget to pay attention to the sensor. The LADA Kalina engine cooling system
is liquid, closed type, with forced circulation.
Consists of an engine cooling jacket, a radiator with an electric fan, a thermostat, a pump, an expansion tank and connecting hoses. Cooling system
:
1
— expansion tank;
2
— radiator outlet hose;
3
- inlet hose;
4
- radiator;
5
— steam exhaust hose;
b
— radiator supply hose;
7
— electric fan;
8
— electric fan casing;
9
— coolant temperature sensor;
10
— coolant temperature indicator sensor;
11
— throttle assembly;
12
— bracket for the coolant pump pipe;
13
— coolant pump;
14
— coolant pump pipe;
15
— heater radiator supply hose;
16
— heater radiator outlet hose;
17
— exhaust pipe;
18
— coolant pump pipe hose;
19
— thermostat housing

The cooling system consists

from two so-called circles of circulation:

1. The movement of liquid through the cooling jacket and radiator forms a large circulation circle.
2. The movement of liquid through the engine cooling jacket, bypassing the radiator, is a small circle of circulation.

The cooling system also includes a heater radiator and a throttle body heating unit.
Liquid circulates through them constantly and does not depend on the position of the thermostat valves. Heater radiator

built into the engine cooling system and is designed to heat the passenger compartment by circulating hot coolant through it.

Fan

maintains the thermal mode of engine operation and is activated via a relay based on a signal from the controller.

Replacement and repair of temperature sensor on Lada Kalina 2

Now you can start replacing this part. Its price is approximately 150 rubles. So, even if you have to change this part, this repair will cost very little.

The Lada Kalina family car is equipped with over ten digital sensors that monitor the operation of mechanisms and assemblies. Most often, drivers complain about premature wear of the coolant temperature sensor (hereinafter referred to as DTOZH).

They say it displays incorrect data, and sometimes is completely inactive. The process of replacing the DTOZ yourself is not at all complicated. The task can be done by a driver without experience in servicing equipment.

If you have never encountered replacing standard equipment, then this article is a recommendation to help you.

The principle of operation of the DTOZH is as follows: after receiving data on the current antifreeze temperature, the measuring device sends the readings to the electronic control unit of the ECU.

The on-board computer compares the received data with the programmed ones. In case of discrepancy, an error is indicated on the dashboard. The owner of the car, seeing a system error, decides on the nature of the breakdown and visits a service station to order a comprehensive diagnosis.

In addition to the DTOZH, the Lada Kalina car is equipped with an external temperature sensor (hereinafter referred to as the DNT). However, not on all trim levels, but only on Lux and Premium.

If desired, the owner can install the measuring equipment himself. The installation work is not at all difficult. In time no more than an hour.

DTOZH is designed to monitor the temperature of antifreeze in the cooling system circuit of the power unit. After receiving the “degree” data, the ECU increases or decreases the speed of the power unit in order to adjust the temperature.

The quality composition of the fuel mixture depends on the accuracy of the DTOZ readings. The service life of the sensor is unlimited, with the exception of mechanical damage or short circuit in the circuit.

Where it is located: the standard installation location is the outer part of the thermostat housing. The base is screwed into the thermostat body. Two power contacts are connected to the upper part for power supply from the on-board network.

A melting element is installed inside the DTOZh base. As soon as the antifreeze degree reaches “90”, the contacts close and the on-board computer signals an error.

Next, the driver decides on the advisability of stopping the car immediately, carrying out preventive maintenance, or calling a tow truck.

Name Catalog item Price in rubles

The device is installed in the mounting location of the front bumper, to the left of the center of the radiator grille. The DNT shape is conical with two contacts on the back side.

The fuse in the mounting block at number 24 is responsible for the operation of the DNT. The absence of temperature readings on the dashboard is the first sign of a malfunction.

Preparatory stage:

• Open-end wrench set to “19”;
• Rags;
• Additional lighting as needed;
• New "measuring device".

Replacement algorithm:

• We install Lada Kalina in the perimeter of the repair area;
• We turn off the engine, open the hood;
• We provide priority safety measures: block the rear row of wheels with wheel chocks, squeeze the parking brake;
• Remove the terminals from the DTOZH, unscrew the sensor with a key;
• We replace the device with a new one, screw it in, and put on the power terminals again.

We turn the key in the ignition, activate it, and check the functionality of the equipment. Add the missing amount of antifreeze as needed.

We don’t need any special tools; we’ll limit ourselves to a screwdriver, wires, terminals, and a new device.

Sequence of actions when replacing DNT with your own hands:

• We place the Lada Kalina on a flat platform, squeeze the parking brake for safety reasons;
• Open the hood and remove the power terminals from the battery. This is necessary in order to prevent short circuits in the circuit during work;
• To the left (right) of the center of the front bumper, screw the sensor onto one self-tapping screw;
• We lay the power cables inside the engine compartment through technological holes;
• We install wiring under the dashboard;
• We remove the instrument panel and connect the outputs to the CAM bus;
• We assemble the structure in reverse order;
• We put the power terminals on the battery.

We start the engine and check the functionality of the measuring device. Equipment replacement has been completed.

• Third-party mechanical damage;
• Manufacturing defect;
• Crack on the base, body;
• Circuit short circuit;
• Loose terminals;
• Moisture getting inside measuring instruments;
• Burnout of the fuse melting element of the fuse box;
• Incorrect operation of the system firmware of the electronic control unit of the ECU.

• Strictly follow the manufacturer's recommendations regarding vehicle maintenance schedules;
• Preferably buy parts with original catalog numbers. The exact data is indicated in the instruction manual for your technical device;
• When the first signs of engine malfunction appear, contact a service station.

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The cooling system is responsible for the optimal temperature regime of the power plant, at which the power output is maximum. This system includes a radiator cooling jacket and pipes through which fluid circulates. Circulation is provided by a pump driven by the crankshaft.

The system also includes a thermostat, which ensures quick warm-up of the engine by shutting off the pipeline going to the radiator, while the liquid circulates only inside the cooling jacket. When a certain temperature is reached, the thermostat opens the pipe, after which the liquid circulates in a large circle, including the radiator.

The radiator cools the heated liquid. To cool the liquid faster, a fan is installed on the radiator, which creates additional air flow. But this fan does not always work; it turns on only when the liquid temperature exceeds a certain value.

The content of the article

To monitor the coolant temperature, a coolant temperature sensor is included in this system. The readings of this sensor are displayed on the dashboard, which provides the driver with information about the temperature conditions of the engine.

But this is not the main task of this sensor. The coolant temperature sensor transmits temperature data to the electronic control unit, after which this unit adjusts the fuel supply depending on the temperature.

When the engine is cold, based on the readings of this sensor, the control unit sets an enriched mixture; after warming up, the fuel mixture becomes normal.

So the normal operation of the engine and fuel consumption largely depend on this sensor. It also drives the radiator fan. On some cars, a separate sensor is used to turn on the fan. It can be located either near the temperature sensor or in the radiator.

The design of this sensor includes a thermistor - a resistor that changes resistance depending on the temperature surrounding it. This thermistor is placed in a metal case with a thread applied to it. A tail section made of plastic is connected to this body. This part contains contacts for connecting wiring. One contact is positive and it comes from the electronic unit, the second is negative and it is connected to ground.

In order for the thermistor to work, a voltage of 5 V is constantly applied to it. This voltage is supplied to it by the electronic unit through a resistor having a constant resistance.

Since the coolant temperature sensor thermistor has a negative temperature coefficient, as the temperature increases, its resistance will decrease, and the voltage supplied to it will also decrease.

Based on the drop in this voltage, the electronic unit calculates the engine temperature and also displays its value on the dashboard.

The exact installation location of this temperature sensor differs from car to car, but only slightly.

It can be installed in the cylinder head near the thermostat housing, or on the thermostat housing itself.

It must be located near the outlet pipe through which the liquid flows into the radiator. It is located near this pipe in order to transmit accurate temperature data.

This sensor is considered to be very reliable due to its comparative simplicity of design. However, there may be problems with it too. Usually they come down to a violation of the calibration, which leads to a violation of the resistance and, as a result, incorrect operation of the electronic unit, since it performs part of its functions based on the engine temperature.

One of the most obvious signs of failure of this sensor is the failure of the fan to turn on when the temperature exceeds the set value.

LADA Kalina engine cooling system diagram

Cooling system
:
1
— coolant drain hose from the heater radiator;
2
— hose for supplying coolant to the heater radiator;
3
— coolant pump supply pipe hose;
4
— expansion tank hose;
5
- expansion tank;
6
— steam exhaust hose of the engine radiator;
7
— thermostat;
8
— hose for supplying fluid to the throttle assembly;
9
— hose for supplying fluid to the engine radiator;
10
hose for draining fluid from the engine radiator;
11
— engine radiator;
12
radiator drain plug;
13
electric radiator fan;
14
coolant pump;
15
supply pipe of the coolant pump;
16
coolant drain hose from the throttle body

Basic data for monitoring, adjusting and maintaining the cooling system