DTOZH is one of the fourteenth sensors, the correct functioning of which directly affects the ability of the vehicle to operate normally.
From this article you will learn why the coolant temperature sensor is so important, what malfunctions can occur during its operation and what signs can be used to identify a failed device; the technology for dismantling and installing a new sensor on a VAZ 2114 will also be discussed in detail.
DTOZH for VAZ 2114
Sensor design
The sensor is a thermoelement placed in a bronze shell. It has direct contact with antifreeze, and the thermoelement, which is enclosed in the sensor, changes its resistance as the temperature rises or falls and transmits the received readings to the computer.
The sensor has a threaded connection sealed with a special copper ring; on the top of the sensor there is a connector for connecting a plug.
The design of the cooling system on the VAZ-2114
Coolant temperature sensor location
Before proceeding directly to the replacement process, it is necessary to understand the design of the cooling system and the location of the sensor in the main power unit:
Everything here is trivial
1 – element in the form of a plug for the expansion tank; 2 – expansion tank; 3 – hose for draining liquid from the pipe; 4 – hose passing between the radiator and the expansion tank; 5 – hose leading from the radiator; 6 – tank to the left of the radiator; 7 – aluminum tube; 8 – plug systems; 9 – tank to the right of the radiator; 10 – drain plug; 11 – middle of the radiator; 12 – casing for electric fan; 13 – plastic wings of the electric fan; 14 – electric motor; 15 – toothed pump pulley; 16 – pump impeller; 17 – camshaft drive belt; 18 – engine block; 19 – pump pipe; 20 – radiator hose with supply function; 21 – heater radiator hose with drain function; 22 – hose supplying coolant to the throttle pipe; 23 – exhaust pipe; 24 – hose for refilling; 25 – heater radiator hose with supply function; 26 – thermostat; 27 – coolant temperature sensor; 28 – coolant level indicator sensor.
The process of replacing the sensor (DTOZH)
As mentioned earlier, the replacement process is too simple and will only take 10-15 minutes.
Therefore, as practice shows, motorists carry out the operation with their own hands. So, let's look at the sequence of actions aimed at replacing the coolant sensor:
We dismantle the battery terminal
In order to get to the sensor you need to remove the air filter
Product selection
The choice of product should be approached carefully, since its quality will directly depend on its service life, as well as engine operating modes. So, let's consider all the options for purchasing a coolant temperature sensor for the VAZ-2114.
Original
Original view of the coolant sensor produced by AvtoVAZ
Temperature sensors
To measure the fluid temperature, two sensors are used, one of them is directly connected to the ECU, and the other to the dashboard. Let's look at each sensor separately.
DTOZH for ECU
This sensor is used only for working with the engine control unit. Measuring the liquid temperature readings, it transmits them to the ECU and, based on the data received, the unit adjusts the air-fuel mixture and also turns on the cooling fan when the liquid temperature reaches a high temperature.
The DTOZH is located in the thermostat housing on a threaded connection.
DTOZH for the dashboard
This sensor is not involved in any operation of the internal combustion engine, but is only informative. This DTOZH is connected to the instrument panel, namely to the liquid temperature scale and measures it only to inform the driver about the state of the internal combustion engine cooling system.
The DTOZH is located in the cylinder head through a threaded connection.
Signs of DTOZH malfunction
The owner can independently determine the need to replace the part. Part failure is accompanied by the following symptoms:
- Increased fuel consumption. Based on incorrect data, the ECU incorrectly selects the ratio of fuel and air mass in the working mixture. A rich mixture with a warm engine leads to increased consumption.
- Engine overheating. Turning on the cooling fan late leads to an increase in the temperature of the liquid in the jacket. When the power unit overheats, metal parts expand, which increases friction between the rotating parts and reduces their service life.
- The engine takes a long time to warm up. The cooling fan operates in advance. The liquid passing through the radiator is constantly cooled. This leads to a decrease in temperature and an increase in the warm-up time of the power unit.
Sensor check
The sensors are checked after its dismantling. To carry out diagnostics, you must have a thermometer and a multimeter.
Let's start checking
- It is necessary to boil water and immerse the thermometer in it.
- Next, set the switch on the device to measure resistance.
- We connect the probes to the sensor and lower the DTOZH into water so that its contacts do not get wet.
- We compare the obtained readings with the table below.
If the parameters do not match, then the sensor is faulty and requires replacement.
How to replace it yourself
Preparatory stage:
- Open-end wrench set to “19”;
- Rags;
- Additional lighting as needed;
- New "measuring device".
Replacement algorithm:
- We install the VAZ 2114 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.
Replacement
Replacing the sensor is not difficult, but you need to prepare a tool. There are two replacement methods: with complete draining of antifreeze and without draining antifreeze. Since the first method is more expensive and time-consuming, we will consider the second without draining the coolant.
Let's get started
Attention!: Work must be carried out on a cool engine to avoid burns!
- We unscrew the cap of the expansion tank to relieve pressure in the SOD and screw it back on.
- We remove the air filter housing by unscrewing the clamp securing the corrugation to the mass air flow sensor, remove the mass air flow sensor chip and unscrew the housing from the car body.
- Remove the connector from the sensor.
- Place a cloth under the thermostat to avoid spilling liquid on the internal combustion engine.
- We prepare a new sensor by placing it on the battery.
- Using an open-end wrench, unscrew the sensor and sharply remove it, plugging the hole in the thermostat with your finger.
- We take a new sensor and install it as quickly as possible so that the liquid does not spill.
- Install the removed parts in reverse order.
- We start the internal combustion engine and check the coolant level, if necessary add antifreeze to the MAX mark.
Bottom line
Many are inclined to criticize the domestic manufacturer for allegedly assembling buckets on wheels rather than cars. It’s worth arguing with this, because our cars are accessible, easy to drive, inexpensive to maintain, and most importantly, with minimal skills and a couple of keys, you can make repairs yourself.
The owner of a VAZ 2110 can restore order under the hood himself in those cases when the driver of some cool foreign car is forced to take his car to a service station and shell out huge amounts of money for servicing.
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AlertOk.rufacebookVKontakteOdnoklassnikiHow to replace the engine temperature sensor of a VAZ 2114? Taras Kalenyuk Sources used:
- https://vaz-2114.info/gde-nahoditsya-datchik-temperatury-ohlazhdayushhej-zhidkosti-vaz-2114/
- https://provaz2114.ru/elektrika/datchik-temperatury-ohlazhdayushhej-zhidkosti-vaz-2114.html
- https://alertok.ru/oborudovanie/datchiki/kak-zamenit-datchik-temperatury-dvigatelya-vaz-2114.html
Thermostat operating principle
The main purpose of the device is to slow down the flow of coolant into the internal combustion engine. By blocking the coolant flow, the engine warms up to operating temperature. As soon as the temperature mark reaches the operating norm, the VAZ 2114 thermostat opens.
On the side that is closer to the internal combustion engine, there is a special wax ball. The waxy material was chosen for a reason, because when heated it transforms from a solid into a liquid. And as soon as the wax begins to transform at a temperature above 83 degrees, it pushes out the pin, which is located in the cylinder. At this time, the valve opens and coolant begins to flow.
Breakdowns
The most popular and common breakdowns of DTOZH include:
- Lack of contact with the sensor;
- Break of contact, insulation disappears;
- The device stops working;
- The fan does not turn on when required.
It is also important to examine the signs of trouble. These include:
- The engine has not yet warmed up, but the fan is already starting to work;
- The engine has warmed up, but still does not work properly;
- Fuel consumption has increased significantly.
One of the common mistakes made by beginners is that they often confuse the coolant temperature indicator sensor with the coolant temperature indicator.
