At what temperature does the fan on the Priora turn on: important features of the thermal regime

Car : Lada Priora. Asks : Zhenya Bald. The essence of the question : what is the best temperature to turn on the motor fan?

Good day. I can’t figure out what is the best temperature to turn on the engine cooling fan on my own Priora. When the food is in the traffic jam, the needle is at 90 degrees, and the fan is already threshing. I was told at the service that the temperature should be about 95 . Moreover, when the fan turns on, the needle immediately jumps, and after a minute it also sharply drops again by 90 degrees.

I connected via elm to look at the switch-on temperature, but I couldn’t find such data in it anywhere. I tried to look at it myself, the fan turns on at 98 degrees. It's kind of scary to drive like that.

Fan nearby. I checked it by hand, it rotates perfectly, without vibrations or problems.

Tell:

What determines the temperature at which the fan turns on?
what temperature is good?

Coolant temperature sensor (fan on) and its purpose

A temperature sensor or DTOZh is a part that is included in the engine cooling system and controls the process of warming it up. This element does not display the corresponding temperature values on the instrument panel, since another device is responsible for this action (temperature sensor on the DUTOZH arrow). DTOZH sends a signal to turn on the fan to cool the radiator (at a temperature of 98 to 107 degrees), through which liquid circulates. That is why such a device is often popularly called a fan sensor. However, its correct name is DTOZH or coolant temperature sensor.

In addition to turning on the fan, the DTOZH on the Priora performs another very important function. It consists of adjusting engine operation by changing the composition of the fuel-air mixture and setting the ignition timing. This is achieved by connecting the sensor to the electronic control unit. A corresponding signal about the engine temperature is sent to the ECU from the DTOZH, and depending on the incoming readings, the engine operation is adjusted. It looks something like this:

When starting the engine cold, the ECU receives a signal that the engine has not warmed up to operating temperature (i.e., cold).
The control unit makes a decision on preparing fuel assemblies in a certain proportion. To do this, a signal is sent to the idle speed regulator, which opens the XX valve to the appropriate distance (a certain number of steps), which leads to an increase in crankshaft speed. To quickly warm up the engine, more fuel is supplied through the injectors, and the ignition angle is also adjusted.
When the coolant temperature rises to a certain value, the engine speed is reduced and the mixture composition is adjusted.

If on carburetor cars only liquid temperature sensors are used to display information on the dashboard, and they do not affect the operation of the engine, then on modern injection engines two types of devices are installed. If the coolant sensor is faulty, the engine will most often start and it will run, but the fuel assemblies are prepared according to average values in emergency mode (the computer, if there is no signal from the DTOZH, takes the temperature of the internal combustion engine as 0 degrees). This also turns on the fan, which cools the liquid in the radiator to eliminate the possibility of overheating the engine (since the ECU does not see the actual engine temperature).

Typical signs of a device malfunction are the following:

unpredictable operation of the cooling fan. If a break occurs in the electrical circuit, which happens due to damage to the supply wire or sensor contacts, the fan will operate continuously
;
floating speed, since the faulty element gives incorrect signals, as a result of which the ECU will strive to adjust the optimal mixture ratio;
The Check Engine light comes on, indicating an engine malfunction.

It is important not to confuse the coolant temperature sensor on the Priora with the element that is responsible for displaying information about the temperature of the internal combustion engine on the instrument panel. These are two different sensors that have a similar operating principle, but are responsible for performing different functions. If there is a malfunction of the device that displays the engine temperature value on the instrument panel, the CHECK indicator will not light up.

This is interesting! On the Priora, the DTOZH has two contacts, and there is only one sensor per arrow. The operating principle of the devices is the same, and the only difference between them is that on the DTOZh the resistance is measured between the terminals, and on the pointing device - between the body and the contact.

Rated operating temperature of the VAZ 21126 Priora engine

To find out what the normal operating temperature is in the Priora 16 class injection engine, just study the factory technical documentation. It says that according to the International Motor Vehicle Manufacturers Convention, the operating temperature in gasoline engines with an injection power system should be within 90 degrees. Specifically, the Priora VAZ 21126 engine must operate in the temperature range from 87 to 103 degrees.

Temperature sensor Lada Priora

This contributes to the normal correct operation of the power system, maximum engine performance, and in addition, the content of harmful substances in the exhaust gases complies with Euro3 standards that were current at that time. And the engine power, as practice shows, remains within the nameplate limits - about 98 forces at 5.5-5.6 thousand rpm. Again, judging by the reviews, and based on practice, fuel consumption during overheating can increase by 15-25%, and when operating the engine at coolant temperatures below 85 degrees, consumption increases by 10-18%.

General information

On Priora and Kalina there is a fan that acts as the main cooling system. It is necessary to prevent overheating and ensure stable operation of the internal combustion engine (ICE). The main element for cooling the power unit is the sensor. Using its signal, the fan is activated.

In cars, this unit is triggered in cases where the thermal performance of the engine exceeds the norm. After starting the fan, which is located near the engine and is triggered by a signal from the controller, the temperature of the internal combustion engine drops to an acceptable level.

Important! The ventilation device does not turn on in cases where the sensor does not produce a signal. This leads to overheating of the engine.

What is the operating temperature of a 16-valve engine on a VAZ 2112

Many motorists, when operating the 16-valve VAZ-2112 engine, encountered the fact that the engine simply boiled. This is due to the engine overheating. What is the operating (normal) engine temperature? In this article, we will consider what temperature should be in the power unit and its systems, as well as the reasons and methods for solving an increase in this indicator.

Priora knock sensor

A knock sensor is a device that detects the knock levels of internal combustion engine processes. The installation location of such a device is the cylinder block. Maintaining it makes it possible to obtain high power, as well as achieve good fuel economy without causing damage to the engine.

The detonation process is the main defect of an internal combustion engine, since the force is considerable and it is impossible to ignore it. Among several different devices that are used as performance optimizations, the knock sensor is used to prevent knocking fuel combustions. Fuel detonation can be controlled thanks to the main indicator - the manifestation of high-pitched and ringing metallic sounds, which, according to indicators, are sometimes mistaken for the clicking sounds of the cylinder-piston group. If the process is strong enough, with faulty knock prevention systems the engine begins to fail.

VAZ cars: repair, maintenance, tuning

Not only the engine life, but also a number of other performance indicators depend on the operating temperature of the VAZ 21126 gasoline injection 16-valve engine. When the operating temperature is lower or higher than the nominal one, power and dynamics are lost; the temperature affects the operation of the heater and the quality of mixture formation. And this entails indicators on fuel consumption and engine life as a whole. Today we will figure out how to change the operating temperature of the Priora, Tens and Kalina 16 valve engine, what temperature is normal and how the cooling system fan affects engine operation.

Factory setting of fan temperature

The switch-on temperature depends on which ECU is installed and what options are used in it. In stock, the first fan should turn on at 97 degrees , the second at 104 degrees .

A little more and the fan should turn on. Depends on the options in the ECU.

You can change the switching characteristics using an on-board computer, for example, BC STATE. We don’t have a BC, but we connected it specifically from another machine, and set the response temperature to 95 degrees. By the way, our editorial office has one of the very first Prioras. Here the factory temperature for turning on two fans is 104 degrees .

We do not recommend the old, old-fashioned method of turning on the fan using a key.

Best temperature

After turning off the fan, the temperature should be at this level. If this is not the case, then look at the thermostat; the fastest it moves the liquid in a small circle.

The best temperature for turning on the cooling fan depends on the operating conditions of the vehicle. If the main mileage is on the highway, then the factory settings (all-suitable) will be good. If you live in a “warm town” and often get stuck in traffic jams, then it is better to lower the switching temperature. It's calmer this way.

An internal combustion engine is a complex mechanism, in order to ensure smooth operation of which a number of criteria must be met. And the temperature regime is no exception. For example, if the temperature is insufficient, this will have a bad effect on the quality of the formation of the fuel mixture in the cylinders. the cylinder-piston group may , which in turn leads to the need for long and expensive repairs.

Thus, the usual temperature (operating) for the Lada Priora engine is 85-90 degrees . When the temperature rises to 97-100 degrees , the fan should turn on automatically. If this does not work out, then the problem may lie both in the fan itself and in the sensor for turning it on . But first you should check the wire connections.

In a number of different cases, the following happens: the fan does not start due to a loose terminal. It is enough to return it to space, and the problem will be solved.

What is the operating temperature of the Lada Priora engine?

A car engine is equipped with a cooling system that contains liquid. The temperature of this liquid is measured by a sensor. This value that it records is the engine operating temperature (ERT). The data recorded by the sensor is displayed on the dashboard. The average operating temperature of a Priora car engine is 95 degrees. This indicator is optimal when the car is moving at a speed of approximately 70-80 km/h and provided that the ambient temperature is not higher than +20 degrees. When the liquid heats up to 100 degrees, the fan turns on, which is designed for additional cooling. With such indicators, it is time to say that the power plant of the machine is functioning without failures. In winter and summer, the RTD may be different. Which RTD is considered optimal for this car? The average is 85-90 degrees.

Throttle Position Sensor

The throttle position sensor (TPS) is installed on the throttle valve on cars without the E-GAZ system. Designed to regulate engine speed. The sensor is not reliable and often fails. If there is a malfunction, the “CheckEngine” light does not always light up.

Signs of malfunction:

Not smooth idle;
The revolutions are floating;
Troubles the engine;
When starting the engine, the speed is increased;
Spontaneous increase or decrease in speed;

Sensor failure - main reasons

Reasons for failure of controllers and performance testing:

Inoperative thermostat. If such a problem occurs in the car, then the fan will not work correctly. It is quite easy to verify that the thermostat is working. To do this, you need to check the lower hose, which should be hot. If the unit has cooled down, it means the thermostat has failed. It is also worth noting that for Prior and Kalin this phenomenon is quite common.
The safety elements have failed. To check the functionality of the fuses, you will need to use a multimeter. To carry out the procedure, you should use the drawing located on the back panel of the unit. The capacity of the fuse element (“3”) must be within 50 mA. After this, it is recommended to check the fan relay, which is indicated by the number “1”.
Contacts have been sent. In this case, you will need to find the engine compartment and check the contacts of the cooling system. In frequent cases, on Priors and Kalinas, contacts break, oxidize and break. Another problem could be winding burnout. If this is the case, the defect can be eliminated by cleaning the contacts and replacing the wiring.
Circuit break. To solve this problem you will have to use a multimeter. If broken wires are found, they should be replaced immediately.
The sensor itself is faulty. The controller can be diagnosed only after removing the thermostat, after which the latter must be placed in hot water.

Attention! It should be remembered that you can use a special scanner to analyze, read and reset all sensors. You can also use it to configure the on-board computer.

DTOZH for the pointer on the instrument panel

The operating principle of this sensor is to change the resistance when the internal element heats up. Passing through the indicator on the instrument panel, the current flows through a single wire to the device. And here the principle of induction in coils comes into play. Simply put, the higher the resistance, the more the needle on the indicator rises, due to the circulating currents in the coil located inside the indicator.

Possible malfunctions of the Priora coolant temperature display system

Most motorists, having discovered that the engine temperature gauge needle does not rise, believe that it is necessary to change the sensor. However, you should first make sure that this is the case. After all, there are several reasons for this state of the panel:

Failure of the pointer on the instrument board.
Break in the wiring.
Direct failure of the sensor.

Therefore, it is better to conduct a small check on your own.

Location and serviceability check of DTOZH

This device is located directly above the Priora flywheel housing. The sensor is embedded in the engine block near the thermostat. It is connected to a single wire with a female connector. The test method for this device is very simple. And it has been used by drivers for a very long time. You need to do this:

Turn on the ignition.
Disconnect the connector from the sensor.
Connect the wire to the block body.

Additional block

Additional relays are mounted on a bar and located under the dashboard, near the front passenger's feet. To get to them, you need to remove the right tunnel lining. Next to the additional relays is the electronic engine control unit (ECU).

If its connector interferes with access to the relay, disconnect it by first removing the negative terminal from the battery.

Circuit breakers

F1 (15 A) – main relay circuit, starter interlock.

F2 (7.5 A) – power circuit of the electronic control unit (ECU).

F3 (15 A) – electric fuel pump . If the fuel pump has stopped pumping (this can be determined by the absence of a sound when the ignition is turned on), check together with relay K2. There may also be problems with the immobilizer, it blocks the pump, see information about F20. If the wiring, this fuse and the relay are good, most likely the fuel pump itself has failed. To remove it, you need to disconnect the battery, remove the rear seat cushion, unscrew the cover, ring and fuel hoses, then carefully remove the entire fuel pump.

Relay:

K1 – main relay.

K2 – electric fuel pump relay . See above about F3.

The principle of operation of the cooling system

The main task of the cooling system is to ensure optimal temperature conditions for the Priora engine. The vehicle is equipped with a system with forced circulation of coolant. Its main element is the cooling jacket through which the liquid circulates.

To maintain the integrity of the shirt, you should constantly monitor:

If its amount is too low, the system will not be able to properly maintain the thermal regime of the power plant, and it will overheat. Antifreeze heavily diluted with water will not have adequate frost resistance, and in winter the shirt may freeze.

Another important element of the system is the liquid pump. The purpose of the pump is to ensure the circulation of Antifreeze throughout the system. The Priora pump is belt driven from the crankshaft. The condition of the pump also needs to be constantly monitored. If the bearing in it starts to fail, it will jam. The result of wedging will be:

This, in turn, will damage the gas distribution mechanism.

Until the engine reaches the desired temperature, the liquid circulates in a small circle, that is, it moves only along the jacket. When the temperature approaches normal, the liquid will begin to move in a large circle. In addition to the cooling jacket, it also includes a radiator with a fan installed on it. The cooler starts working only when the liquid temperature begins to exceed the permissible limit. For monitoring, a temperature sensor is built into the cooling jacket, also known as a fan switch on sensor.

The thermostat is responsible for which circle the Tosol moves in. Incorrect operation of the thermostat or its jamming will either lead to overheating of the unit or to the fact that it will not be able to reach the optimal thermal conditions.

This system works on a Priora like this: while the power plant is cold, the thermostat is in a position that blocks the channel going to the radiator. The liquid, thanks to the pump, circulates through the cooling jacket. As it warms up, the thermostat begins to open the channel slightly, and liquid begins to flow into the radiator to reduce the temperature of the liquid itself.

In the summer, when idling in a traffic jam, the air flow passing through the radiator is insufficient, and the temperature continues to rise. The fan switch-on sensor monitors this indicator, and if it begins to exceed the permissible limit, it turns on forced cooling of the radiator, which additionally creates an air flow to ensure cooling of the Antifreeze.

How to remove and replace the coolant temperature sensor (fan on) on a Priora

The process of replacing the sensor is not complicated, but before implementing it, it is important to know the following: before unscrewing it, you should unscrew the cap of the expansion tank and relieve the pressure in the cooling system. After this, you can begin dismantling work, but it is also important to take into account that after unscrewing the product, antifreeze will flow out of the installation hole. According to the manual, it is recommended to drain antifreeze from the radiator in an amount of at least 1 liter, but practice shows that if you relieve the pressure in the system and quickly replace the device, a small amount of liquid will leak out.

This is interesting! It is important to understand that if you are working on a warm engine, you need to either wait until it cools down or drain the antifreeze so as not to get burned in the process.

The process of replacing DTOZH on Priora is carried out as follows:

Disconnect the negative terminal from the battery. Why do this? Naturally, no one is going to short-circuit the contacts, and the likelihood that they will close when in contact with metal parts of the engine is extremely low. However, after removing the sensor, antifreeze may get on the chip, and if there is voltage on it (there is none when the ignition is off), the ECU may short out. And therefore, if you do not disconnect the terminal from the battery, then after removing the chip, move it to the side so as to eliminate the possibility of a short circuit. However, to reduce the risk, it is better to disconnect the terminal on the battery.
To make work easier, it is recommended to remove the air purification filter housing.
After draining at least 1 liter of liquid from the cooling system (if you decide to go the right way), you need to disconnect the power supply. To do this, you need to pull back the tongue and remove the chip.
Unscrew the sensor with an open-end wrench to “19”, and if liquid leaks out of the hole, quickly install a new sensor in place, having previously prepared it.
When installing, do not forget about the copper washer.
Tighten the sensor with a force of 9.3-15 Nm using a torque wrench.

This completes the process of replacing the fan sensor on the Priora. All that remains is to reset the errors from the BC and make sure that the engine is working properly, as well as the absence of signs that forced you to check and replace the DTOZH.

Engine disassembly and repair

Repairs are carried out according to the standard procedure - we find faulty parts and replace them with working ones. The instructions below describe the process of disassembling the unit itself; before that, you need to dismantle it from the Lada Priora and thoroughly clean it of grease and dirt.

From the tools we will need regular and ring wrenches, a ratchet with an extension, screwdrivers, a pry bar and a stand. It is best to carry out repairs in a garage with good lighting.

Instructions

Using the 13th key, remove the bracket fastenings. 4 nuts hold the front cylinder block support;
We remove the bracket and move on to the left support - it is removed in exactly the same way;

Thus, you can completely disassemble the 16-valve engine and repair and replace faulty parts. But if the unit bends the valve, then only an experienced mechanic can handle the malfunction with his own hands. In any case, you will find out whether the motor bends the valves or not after removing the head cover.

Guys, tell me, when driving at first, second speed and in traffic jams, the engine temperature quickly rises to 100, 107 degrees, when driving at high speed the temperature drops to 85 - 90? This is especially noticeable now, in the spring, the weather is warm. Is this normal? phenomenon? What will it be like in the summer at plus 40 degrees? Will I overheat the engine? Thank you all in advance!

Hi all! I recently bought a Lada Priora 1.6 16 cl. 2009 with air conditioning. The car is constantly heating up, the temperature is closer to 100°. I changed the pump and timing belt, at the same time drained the entire system (the plug option is excluded, I think), the thermostat was changed, the pipes are all hot.

Tell me what the reason is.

And another question, maybe someone had! I did a full diagnosis of the injector, the result: not a single error, engine operation is smooth, system pressure is 4, the gasoline filter has been changed. But the car doesn't pull anything? What could this be, what should I do?

Thank you all in advance) I’m already thinking about selling it!

Fan diagnostic method

Experts say that injection cars are considered the most practical. They can be diagnosed much faster than all others. It is advisable to use computer diagnostics to thoroughly investigate the cause of all malfunctions. Some models, when making errors, immediately show a constantly spinning fan. This helps protect against overheating.

To reset errors, you need to remove the terminal from the battery for a few seconds. After the system is cleaned, everything returns to normal.