Where is the temperature sensor (DTOZH) located on the VAZ 2110, 2114, 2115

The engine of a car is its heart. Thanks to it, many systems and processes operate that allow us not only to move from point A to point B, but also to do it as comfortably and safely as possible. An important parameter in engine operation is its temperature. When it increases, boiling occurs and failure occurs, which is quite difficult and costly in terms of repair. To prevent this from happening, coolant is used everywhere, the temperature of which is monitored by a special sensor.

In addition to its main function of cooling the engine, the coolant also protects its parts from corrosion and the system itself from blockages.

The coolant temperature sensor helps the car owner to recognize engine overheating in time and eliminate its causes in order to avoid more serious consequences of this malfunction. Constant monitoring prevents the engine from overheating, which not only ensures optimal operating conditions for the system, but also saves fuel, the consumption of which increases significantly if the engine temperature does not meet operating standards.

If there is a malfunction, the coolant temperature sensor can lead to engine breakdown, which is fraught with all sorts of unpleasant consequences - corrosion of engine components due to overheating, excessive fuel consumption and many others.

Types of coolant sensors

Magnetic. Consists of an armature and two coils. The armature is connected to a scale pointer on the car's dashboard. One of the coils is connected to a cable with varying resistance values, and the second to the vehicle network.
Bimetallic. It consists of a combination of two metal elements with different temperature resistance. Under the influence of heat, expansion occurs, which activates the device on the panel.
Semiconductor. A more common type of sensor than bimetallic. The operating principle of the device is based on reducing resistance when heated.
Capillary. Today it is practically not used, as it is considered outdated and not the most convenient type of DTOZH. It is a capsule filled with a substance with a low boiling point. When the engine warms up, the coolant begins to boil, which leads to an increase in pressure in the detector system, as a result of which the indicator needle begins to move.

What signs indicate a sensor malfunction?

Car owners can independently understand that the DTS is starting to work poorly based on the following signs:

the car fan starts working even if the VAZ-2114 engine has not completely warmed up;
a fully warmed up engine refuses to work normally;
fuel consumption increases several times.

Among the most common breakdowns are the following:

contact with the temperature sensor is lost;
the connecting contacts break and the protective insulation breaks;
The cooling fan starts to work intermittently.

Before you start replacing the DTOZh, you need to check its operation and in no case confuse it with the coolant temperature indicator sensor, which quite often happens among car enthusiasts who carry out work without taking into account the recommendations.

Where is the temperature sensor located on the VAZ 2114?

For proper operation, ensuring the collection and transmission of optimally accurate indicators, the DTOZH must be located in direct contact with the measured medium, that is, it must be immersed in the coolant.

Let's look at a temperature sensor using the example of one of the cars in the Lada model range.

The cooling system of VAZ cars is a complex of the following parts:

heating and cooling radiators;
fan;
pump;
expansion tank;
coolant temperature sensor.

The measuring device, located between the thermostat and the cylinder head, consists of a resistor and is connected to the control unit by two wires.

Determination of the heating level is based on the resistance value, which increases or decreases depending on the coolant temperature.

Important! The temperature detector on the VAZ 2114 is not located on the radiator, which is typical for other VAZ models, but on the engine block.

Based on the data transmitted by the temperature sensor, the control system can regulate the following aspects of the vehicle’s operation:

enrichment or depletion of fuel (depending on the temperature of the engine - the lower the heat indicators, the less the fuel is enriched and the greater the amount required);
setting the ignition timing in order to reduce exhaust gas formation;
adjustment of gas circulation when the vehicle warms up;
control over fan operation, transfer case blocking and system purging.

Why do you need DTOZH?

Appearance of DTOZH for VAZ 2114

The coolant temperature sensor, or simply DTOZH, is one of the most important measuring instruments. It is located in the engine compartment and is responsible for measuring the temperature of the coolant (coolant) in the system. As a measuring element, a pointer is installed in the part, which is called a thermistor - a resistor that changes the current resistance depending on the engine temperature. This information is needed to adjust engine parameters:

Crankshaft work.
Composition of the combustible mixture.
Quick engine warm-up when starting.
Stability support in all modes.

Despite the importance of such a device for the VAZ 2114, the principle of its operation is relatively simple. It tells us about changes in coolant temperature and transmits the necessary information to the electronic control unit (ECU).

The DTOZH transmits readings to the electronic control unit (ECU), which, using the temperature indicator on the instrument panel, informs the driver.

Signs of DTOZH malfunction

There are several points that will help a VAZ car owner determine the failure of the coolant temperature sensor;

incorrect sensor readings (high data when the engine is hot, or vice versa);
it is difficult to start the engine, regardless of the temperature outside;
difficulty stopping a hot engine at idle;
significant excess fuel consumption;
overheating of the engine, which may be accompanied by smoke from under the hood;
turning on the fan when the engine is cold;
Uncharacteristic exhaust color.

Video “Replacing DTOZH on a classic VAZ”

This video from Vasily Kalugin demonstrates the procedure for replacing the coolant temperature meter on a VAZ classic.

Any brand of car is primarily considered as a piece of equipment that is equipped with numerous devices and components. Unfortunately, sooner or later one of them, and maybe even several, fail. Probably every car owner understands that the car will not be able to function normally if at least one element does not work at full capacity. And if the sensor or DTOZh fails, which ensures that the coolant temperature does not rise above the required level, then the VAZ-2114 car, and any other model, may simply overheat, and the engine, as they say, will boil.

Coolant should always be present in the car, and at the right level, especially in the summer, when the engine gets hottest. After all, no one wants to just stop in the middle of a field in the summer heat if, for example, the family is going to the dacha and waiting for a tow truck to arrive. After all, if the engine overheats, the driver simply will not be able to start the car on his own, and tow truck services, as many people know, cost a lot of money. To prevent such a situation from arising, you need to constantly monitor the temperature of the antifreeze and at the first sign of a malfunction of the VAZ-2114 DTOZH, replace or repair the device that has become unusable.

Causes of failures

The malfunctions described above can be the result of various factors. Before sinning with a thermal detector, it’s worth checking a couple more nuances:

coolant level and quality (perhaps it has already expired and requires replacement);
fans are faulty;
there is no contact with the device (the insulation is broken, or there is simply an open circuit).

If all previous indicators are normal, then it is necessary to check the analyzer itself and, if it fails, replace it with a new one, since it cannot be repaired.

Typical signs of DTOZh failure

After some time, all malfunctions that occur in the circuit are entered by the controller in the form of a code into the ECU memory.

A signal about engine malfunctions is sent to the instrument panel in the form of a lit “CHECK ENGINE” indicator light.

Signs of a faulty meter on a VAZ 2114:

turning on the fan when the engine is cold;
fuel consumption increases;
There are problems starting a warm engine.

lack of contact with the device;
rupture of contacts, violation of insulation;
sensor failure;
The fan does not work when needed.

Before changing the DTOZH on a VAZ 2114, you need to make sure that this is the cause of the problem. The malfunction may be caused by a broken fuse or a faulty fan.

How to diagnose DTOZH?

First of all, the engine is started and the behavior of the measurement scale is observed, based on which the fault can be determined.

In the case of maximum performance with a cold engine, you need to disconnect the contacts and look at what happened:

the readings have dropped - the device needs to be changed;
there have been no changes - you need to check the contacts going to the meter.

If the needle behaves inappropriately during stable heating, you should pay attention to the fuses.

Another diagnostic method is to use a multimeter (a combination meter that can perform the functions of an ohmmeter, voltmeter and ammeter) in combination with a heat-resistant thermometer.

We set the multimeter to ohmmeter mode, attach its contacts to the sensor, which we immerse in a container with coolant. We begin to heat the liquid and compare the readings of the device with the correspondence table.

Taras Kalenyuk

auto RU

As an example, we can give several numbers - at a temperature of 30 degrees, the multimeter readings will be from 1350 to 1880 Ohms, and at 110 degrees Celsius - about one hundred.

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Checking the functionality of the sensor

Work to check the meter should be carried out on a cold machine. DTOZH transmits information about the coolant temperature level to the ECU. If it is too high, the unit turns on a fan that will drive air currents.

There are two ways to check the device on the VAZ 2114. Let's look at each of them.

To check, you need to start the engine and look at the readings on the instrument panel. If the gauge reaches the maximum level and the engine remains cold, the sensor must be disconnected.

The process of disconnecting the wire from the meter

If after this the arrow reaches the minimum level, this indicates a malfunction of the device and the need to replace it.

If the arrow remains at the maximum level when the device is turned off, you should inspect the contacts of the device. It is possible that they short to machine ground.
After turning on the ignition, the engine warms up evenly, and the indicator needle either lies at zero or jumps in different directions; you should check the fuses.
If the fuses are normal, you need to close the contact to vehicle ground. If after switching on the indicator arrow jumps up sharply, it means the sensor is faulty.

To use the second method, the device must first be removed.

To do this you need to do the following:

To get to the sensor on the VAZ 2114, you need to remove the air filter.
Disconnect the negative terminal from the battery.
The next step is to drain the coolant from the radiator.
After disconnecting the wiring from the device, you can unscrew it. If you are unable to unscrew it by hand, you can use a key set to “19” to loosen the tightening.

Unscrewing the device by hand

The functionality test consists of the following steps:

A multimeter is required to check. The device must be set to ohmmeter mode.
Next, you will need a thermometer with graduations of more than 100 degrees and a heat-resistant container.
Now we attach the multimeter probes to the meter terminal and the housing.
Next, you need to heat the liquid and take readings with an ohmmeter and thermometer.

Checking the device with a multimeter

Table of readings for a working device:

Temperature, degrees	Resistance, Ohm
20	3520
40	1459
60	667
80	332
100	177

If the readings differ from the values given in the table, then it needs to be changed. This device cannot be repaired. If the sensor readings coincide, then the cause must be sought in a malfunction of another device, for example, a thermostat.

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How to check DTOZH

First of all, you need to remember that in order to correctly indicate the temperature of the coolant, the sensor must be immersed in this very liquid. Therefore, regularly check the presence of refrigerant and its level in the system. This is perhaps the very first thing that should be done if there is a suspicion of inadequate operation of this meter.

If the level of antifreeze in the cooling system is in perfect order, then the contacts may be oxidized or there are other irregularities in the connection of the coolant temperature sensor. You can check its connection yourself. Typically, but not always, this sensor is installed next to the thermostat. In some engines, there is more than one DTOZH. Therefore, check the number of sensors and their location, which are correct for your car. When you have found the coolant temperature sensor and determined that everything is in order with its connection, you need to check the device itself. To do this, the DTOZH must be dismantled, since it must be checked by immersion in a glass of boiling water.

And so, take your sensor, lower it into a glass of boiling water and measure the resistance at the output. In general, there are no uniform indicators of changes in resistance. Sensors for different machines, from different manufacturers, will show different resistance differences. The correct values at certain temperatures, specifically for your sensor, need to be found on the Internet.

How to remove DTOZH VAZ 2114?

The sensor is located on the inlet pipe of the cylinder head cooling jacket; in order to remove it, you need to remove the air filter.
Remove the negative cable from the battery.
Next, you need to drain the coolant from the radiator.
Disconnect the wiring from the sensor.
Using a key set to “19” or “21”, loosen the tightening, then unscrew it by hand.

Self-removal of the sensor

Before removing the DTOZH from the VAZ-2114, you need to dismantle the air filter so that it does not interfere with operation. Next you need to do the following:

Drain the coolant. You should definitely take into account that you only need to drain antifreeze or antifreeze from a cold engine and before work, prepare a container into which the liquid will be drained. Place the container under the bottom of the radiator, carefully unscrew the drain plug and wait about 15 minutes for the liquid to completely drain.
The rubber protective layer is carefully removed from the sensor.
Using a 21 key, the device is unscrewed.
The meter markings are inspected so that the new sensor can be installed in accordance with the main system.
A new one is installed in place of a device that has become unusable, taking into account the markings. Before installation, experts recommend applying a high-quality sealant to the threads to prevent leakage of antifreeze or antifreeze.
Coolant is poured to the required level into the radiator and into the engine cylinder block.

At this point, the stage of replacing the VAZ-2114 DTOZh that has become unusable will be considered completed, and, as many can see, such work is quite simple. But if, nevertheless, difficulties arise when replacing or finding out the cause of the DTOZ malfunction, a training video will come to the aid of the car enthusiast, which you can watch on the web resource at the most convenient time for yourself.

Step-by-step device check

You need to independently check the functionality of the sensor in stages:

If, when the engine is running, the arrow on the instrument panel rises to the maximum, and the engine is cold, you need to disconnect the connecting contacts from the sensor. If the arrow drops to the minimum mark, the element will have to be replaced.
Otherwise, if the arrow on the dashboard does not change its position, you just need to inspect the connecting contacts to make sure that a short circuit has not occurred to the vehicle ground.
If the engine warms up normally, but the needle does not rise from “zero” or continuously changes its position, you should look for the cause of the malfunction in the fuses.
If upon inspection it turns out that the fuses are functioning normally, you will need to short-circuit the vehicle ground. If the needle rises to the maximum mark, the sensor will have to be changed.