Oil pressure sensor VAZ 2109 (carburetor, injector): where is it located, malfunctions

Where is the oil pressure sensor located? It is located just below the block head cover, see the photos below for more details:

Note! A protective cover is installed on top of the oil pressure sensor, which, unfortunately, is removed in the photo, so when you look for this sensor, look closely at its protective cover, and not at the sensor itself. (What kind of protective cover is installed on the sensor, see the first picture, in the “Removing the sensor” section)

When should you change the oil pressure sensor? It must be replaced when worn out, this can be determined in the following ways:

1. The first signs of a sensor malfunction are the oil pressure lamp indicator lighting up on the instrument cluster.

Note! But here you need to be absolutely sure that everything is in order with the engine, otherwise, as happens, people first blame the sensor, and later they find out that they actually have a problem with the engine, so so that such questions do not arise, check carefully :

• The oil level in the engine, if the level is too low, then bring it to normal. (How to check the level and bring it to normal, see the article: “Changing the oil”)

• Further, the electrical wiring that is connected to the sensor may also be faulty.

• Also, the oil pressure lamp coming on can be caused by some kind of malfunction in the engine lubrication system.

2. If the oil pressure sensor is faulty, it may also be oily, so first of all, take a closer look to see if there are any oil particles on your sensor.

How to replace the oil pressure sensor on a VAZ 2108-VAZ 21099?

Removal: 1) First, by hand, disconnect the wire, together with the protective cover, from the sensor.

2) Next, using a wrench, completely unscrew the sensor.

3) And then remove it from the hole.

Installation: 1) Install the new sensor into the hole first.

2) And after installation, screw it all the way using a wrench.

3) After the sensor is screwed in, connect the wire to it by hand, together with the protective cover.

Important! When choosing a new sensor in a store, pay special attention to its markings; we recommend that you install a new sensor with the same markings that were applied to the old sensor!

Every modern car, including the VAZ 2109, is equipped with a variety of sensors and devices, each of which plays its own important role. One such device is the oil pressure sensor. It is located in the engine compartment. Regardless of which engine the car is equipped with, an injector or a carburetor, the sensor is located on top of the cylinder block on the intake manifold side.

A protective cover is installed on top of the oil pressure sensor. To ensure stable operation of the engine and the entire machine as a whole, it is necessary to ensure that the sensor is working properly. An oil filter is located next to the sensor.

Oil pressure sensor VAZ 2108, 2109, 21099

Using the example of the MM120D engine oil pressure sensor for VAZ 2108, 21081, 21083, 2109, 21091, 21093, 21099 cars, we will analyze why it is needed, how it works, what malfunctions it has, and also determine its applicability.

Oil pressure sensor in the lubrication system of carburetor engines (2108, 21081, 21083) of VAZ 2108, 2109, 21099 cars

— What is an engine oil pressure sensor used for?

An oil pressure sensor working in conjunction with an emergency oil pressure warning lamp is necessary to monitor the oil pressure in the engine lubrication system. If the oil pressure decreases, the sensor closes the electrical circuit of the warning lamp and it lights up, signaling to the driver that there is a malfunction in the car’s engine.

— Where is the oil pressure sensor installed on VAZ 2108, 2109, 21099 cars

The oil pressure sensor on the engines of VAZ 2108, 2109, 21099 cars and their modifications is installed in the cylinder head on the right side, near the intake manifold. It is threaded into a special hole. A wire tip is attached to its output to the emergency oil pressure lamp (in the instrument panel).

Installation location of the oil pressure sensor on VAZ 2108, 21081, 21083, 2111 engines

— How does the oil pressure sensor work?

After turning the key in the ignition switch, the emergency oil pressure warning lamp in the instrument panel lights up because the contacts in the oil pressure sensor connected to it are closed and through it the electrical circuit of the lamp is connected to ground.

After starting the car engine, the pressure in its lubrication system increases. When the value reaches 0.2-0.6 kgf/cm², the diaphragm inside the sensor begins to bend, lifting the pusher and movable contacts of the sensor upward, compressing the spring. The moving and fixed contacts of the pressure sensor open, breaking the electrical circuit, and the control lamp goes out.

Similarly, the sensor is triggered when there is an emergency decrease in pressure in the engine lubrication system if any malfunction occurs.

Diagram “operation order of the oil pressure sensor VAZ 2108, 2109, 21099”

— Malfunction of the oil pressure sensor

More information about engine oil pressure and oil pressure sensor malfunctions: “Low engine oil pressure, symptoms, causes.”

— Connection diagram for the oil pressure sensor on VAZ 2108, 2109, 21099 cars

— Applicability of the oil pressure sensor on VAZ cars

On engines 2108, 21081, 21083, 2111 of VAZ 2108, 21081, 21083, 2109, 21091, 21093, 21099, the MM120D sensor (MM120, MM120DM) or its analogues from different manufacturers is used. Catalog numbers 2106-3829010, 2106-3829010-01, 2106-3829010-02, 2101-3810600.

Notes and additions

Oil pressure sensor nut with spanner “22”, M14/1.5 thread. Tightening torque 3-4 N.m.

Source

Sensor design

The oil pressure sensor in modern cars is quite simple. It includes an outer casing, a hard elastic membrane and a transfer device. The principle of interaction of the device is the interaction of oil with an elastic partition.

The membrane reacts to the force with which the oil presses on it. The oscillations of the partition, the opening and closing of the contacts of the electrical circuit, communicate with the rheostat. Changes in rheostat indicators are displayed on the dashboard of the VAZ-2109.

A malfunction of the sensor is indicated by a light on the panel. When an alarm icon appears, you must immediately check the serviceability of the sensor. But before doing this, you should make sure that the engine oil level is correct.

Today there are several oil pressure sensors for the VAZ-2109, which any owner of this car can purchase if necessary. The table shows the types of sensors, as well as their article numbers and prices.

Sensor	vendor code	Cost, in rubles
Oil pressure sensor analog MM120D	SOP20101O7	80
Oil pressure sensor VAZ Samara	33000	150
Oil pressure sensor (BCG)	OS3518-BCG	150
Oil pressure sensor ERA	11260	100

Replacing the oil pressure sensor on a VAZ 2109

It is not uncommon for a lamp to light up on the panel of a VAZ 2109, which indicates that the oil pressure is too low or completely absent. At the same time, the inspection showed that there were no leaks anywhere.

Appearance of the device

First of all, it is recommended to check the oil pressure sensor (OPS). Based on the analysis, we can conclude whether the controller is really to blame, or whether the cause should be looked for in other places.

Sensor check

In practice, there are several proven methods for checking the oil pressure sensor.

The first method involves removing the device and idling the starter. If, when the device for mechanical engine starting is turned on, oil begins to pour out from the location of the sensor, then the device is in working order.

You need to carefully inspect the sensor, then treat it with a degreasing liquid, for example, gasoline. Then the sensor must be returned to its original place. If in this case the light on the dashboard remains on, it means that the sensor has failed and needs to be replaced.

The second verification method is more thorough. In this case, you should do the following:

Check oil level.

Start the engine and warm up the car.
Unscrew the sensor and connect it to the device for testing. An adapter from a pressure gauge should be installed in place of the sensor.
Ensure that the pressure gauge is in contact with the ground (ground).
Connect the positive LED from the battery to the sensor contact.
Start the engine, press the gas pedal.
If the pressure gauge shows a value of 1.2-1.6 bar, the LED will turn off; if not, then the sensor has failed.

Often a light comes on on the dashboard of the VAZ-2109, indicating problems with oil volume

The third method involves checking the oil pressure sensor using the crankshaft. To do this, you need to crank the crankshaft without turning on the engine. At the same time, pour oil into the place where the sensor was screwed in. If the light is on, it means the device is unusable and needs to be replaced.

Sensor diagnostics

Electronic and mechanical oil pressure sensors are checked in different ways, so we will consider each of them separately.

But before you start checking, it is important to make sure that it is the DDM that is the root cause of the warning light that does not go out.

First, make sure that the oil is in good condition and that its level in the engine is within normal limits. Is the filter clogged because the fluid in the system was changed a long time ago? Make sure the pump is working properly.

IMPORTANT: check the wiring from the sensor to the computer, the condition and integrity of the contacts.

Next, find and remove the sensor itself. This must be done with the engine turned off. Preferably cooled. On different cars the unit may be located in different places.

Replacing the sensor

The process of removing and installing the sensor is quite accessible to any car enthusiast. Before screwing in the new sensor, you need to check the markings.

Experts recommend installing a new sensor with the same markings as the old one.

First you need to disconnect the wire with the protective cover from the sensor.

Using a wrench, unscrew the bolt and remove the sensor.

Install the new sensor in place.

After this, you should tighten it until it stops with a wrench.

Finally, you should start and stop the engine several times to check its operation and absence of malfunctions.

What to do if the sensor lights up

If the oil pressure light on the dashboard comes on and does not go away for a long time, it can be assumed that there are problems with the engine. Sometimes this may be due to a loose wire.

There are several main reasons why the warning light on your dashboard comes on. These include:

installation of a low-quality oil filter. Low quality filters are not able to retain oil after the car is stopped. The solution is to replace the oil filter;
insufficient oil level. In this case, it is necessary to add oil to the required level and find the cause of the leak;
oil pump damage. It is recommended to have this problem repaired at a service station.

Thus, the oil pressure sensor on the VAZ-2109, despite its small size, plays a rather important role in ensuring the correct and stable operation of the car.

It requires constant monitoring and, if minimal signs of malfunction appear, mandatory replacement. This is the only way to extend the life of the engine of any car and avoid unnecessary financial costs that may arise due to sensor malfunctions.

The owner of the Nine will most likely find out that there is a VAZ 2109 oil pressure sensor and an oil level sensor in the engine compartment when the indicator on the instrument panel lights up red, indicating that there are problems with the oil pressure level. And then many questions immediately arise, including what kind of oil should be poured into the system, whether its volume is sufficient, but most importantly, whether this small device has deteriorated. Let's take a closer look at what an oil pressure controller is, what its operating principle is, and how accurately its performance can be determined.

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Replacement

So, the check showed that the oil pressure sensor is the culprit and it needs to be replaced. There is definitely no need to go to a car repair shop for this. The work is easy to do with your own hands, even for beginners in the field of self-repair of a car. Especially when it comes to repairing a car like the VAZ 2109.

Dismantling works

To replace the sensor, you first need to remove it and install a new one in place of the old device. Step by step it looks like this.

Obviously, there is absolutely nothing complicated about replacing DDM. The greatest concern is the fact that replacing the DDM will not produce results and the check engine light will stubbornly continue to light on the dashboard. It cannot be ignored. It's better to contact a service station. Comprehensive diagnostics is an excellent solution, which at the same time will allow you to determine the presence of other faults in the systems of your VAZ 2109.

Source

Sensor design and operating pressure check

To determine whether a device is functional, you need to understand how it works. It is also useful to know how the controller and the VAZ engine, or rather its lubrication system, interact with each other. The sensor is mounted on the cylinder head on the side on which the carburetor is located. Next to the controller there is a VAZ oil filter.

The design of the oil pressure controller is very simple. It consists of a housing, a built-in control and measuring elastic membrane and a transmission mechanism. The principle of operation of the device in question is also quite simple. Engine oil for VAZ, located in the lubrication system, acts on the membrane during engine operation.

The latter is deformed by an amount corresponding to the oil pressure. Vibrations of the elastic “partition”, which make or break the contacts of the electrical circuit, are transmitted to the rheostat through the mechanism mentioned above. In turn, changing the resistance of the rheostat affects the indicator readings on the car’s dashboard.

Checking the operating oil pressure using the crankshaft is used, as a rule, in cases where the indicator begins to signal a drop in pressure in the lubrication system away from the service station, and the driver does not have a pressure gauge at hand.

Before checking, you must make sure that the oil level in the system and the corresponding VAZ 2109 filter are in order. If the level is insufficient, the oil will have to be filled to the nominal level. Then you can proceed directly to checking the health of the sensor. For this purpose, it is unscrewed from the socket.

With the lubrication system open, the crankshaft of the machine is turned manually (without turning on the engine). If at the same time the hole into which the oil pressure controller was screwed begins to fill, then the pressure is normal. The indicator that continues to light indicates that the sensor has failed.

In this case, the device should be carefully inspected for defects. If there is no damage, it must be washed with gasoline (diesel) and installed in its original place. If the light continues to light after this, the sensor will have to be replaced.

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Device DDM VAZ2109

Main components of DDM:

Frame
Measuring membrane
Transmission mechanism

Operating principle of DDM

Depending on the pressure in the oil system, the membrane bends and at the same time closes or opens electrical contacts. Before checking the pressure sensor (controller), be sure to check that the engine oil level and oil filter are in order. Visually check for any lubricant leaks on the motor housing. If everything is in order, we can move on to checking the controller himself.

How to check the controller

Everything related to any pressure is usually checked with a pressure gauge:

Screw the pressure gauge into place of the sensor and start the engine
At the same time, at idle, the pressure gauge should show a pressure of 0.65 kilograms of force per square centimeter or more
This allows us to conclude that the lubricant pressure is OK, but the pressure sensor is faulty, and therefore you need to urgently replace the oil pressure sensor on the VAZ 2109

When you don’t have a pressure gauge at hand, and suddenly the oil pressure light comes on in the middle of the highway, you can check the lubricant pressure controller in another way:

To do this, you need to unscrew the sensor itself and turn the engine with the starter without starting it
If, when the starter rotates (see Repairing the VAZ 2109 starter yourself - an opportunity to save a lot of money) oil flows from the sensor socket, it also becomes clear that the controller is faulty and needs to be replaced

After removal, carefully inspect it; if no visible defects are found, rinse it:

It is recommended to wash with diesel fuel or gasoline
You can inject liquids using a syringe or a powerful pump
Now we put the controller in place and check whether the control lamp lights up
If after washing the pressure lamp is on, buy a new controller
Repairing the old one is pointless - it won’t work properly anyway
And a new one costs a penny

Another way (more accurate) to check the functionality of the sensor and at the same time the bypass valve:

We check the lubricant level in the engine with a dipstick indicator
Top up to level if necessary
Check again whether the lamp on the dashboard lights up (if not, then the problem is solved, if not, proceed to the next step)
Warm up the engine to its operating temperature and turn it off
Screw the pressure gauge into the sensor socket
We connect the ground from the pressure gauge to the ground of the car
We connect the control LED with the “+” terminal of the Battery and the sensor contact (additional wiring is required)
We start the engine and press the gas so that the speed rises smoothly
When the pressure gauge reads 1.2-1.6 bar, the LED must go out
If this does not happen, it means that the VAZ 2109 oil pressure sensor is faulty; replacement will solve this problem

However, if the diode goes out, then the controller is working, and the lamp is on for a completely different reason, to determine it, do the following:

We bring the engine speed to 2000
If at its temperature the pressure gauge pressure shows less than two bar, this means the crankshaft bearings are worn out.
If there are two bars or more, check further
Raise the engine speed
If the pressure suddenly jumps to seven bar, it means the bypass valve is not working
It should be replaced with the oil pump cover together

Replacement of DDM

To perform some of the above-described checks, as well as replace the sensor with your own hands, if it is found to be unsuitable, our further instructions have been written:

A key set to “21”, the only necessary tool, and of course a replaceable lubricant pressure controller
Disconnect the wire from the sensor

Remove the wire from the controller

Using the key to “21”, unscrew the sensor

Unscrew the controller with the key “21”

The controller is sealed with an aluminum ring-shaped gasket
We screw in the new controller, and do not forget to connect the wire to it

This completes the replacement of the VAZ 2109 oil sensor, as you can see it takes more time to identify the cause.

Checking the pressure controller using a pressure gauge

The second method is more accurate and involves the use of special devices. Note that this method can also test the bypass valve at the same time. The preheated engine, into which the required volume of oil is poured, is turned off. The sensor removed from the engine is screwed into the pressure gauge. In place of the sensor, screw the adapter of the monitoring pressure gauge.

As a result of these connections, the pressure gauge and sensor should form a single circuit that records the impulse from the lubrication system to the indicator. Next, start the engine, its speed is gradually increased until the pressure gauge shows a value of 1.2-1.6 bar. If the sensor is working properly, the LED goes out. If it continues to light, it means the controller has failed.

If the oil pressure indicator is lit when the sensor is operational, it indicates that the cause of the problem is most likely something else. As practice shows, most often this situation can indicate either wear of the crankshaft bearings or a breakdown of the bypass valve. If we are talking about a technically faulty sensor, it is better to replace it with a new one.

This is quite easy to do, and the controller itself is quite inexpensive. It is advisable that, along with replacing the control device, the oil in the VAZ 2109 engine should also be changed. In this case, the problem of what oil to fill and how much to fill should be decided by each motorist separately, depending on the car model and its operating conditions.

In any case, the condition of the sensor must be monitored. After all, even though it is not as complicated as, for example, a carburetor, it also has problems. And they can affect the technical condition of the car no less painfully than breakdowns of more complex units.

The VAZ 2108 car is equipped as standard with an electronic engine oil pressure sensor (hereinafter referred to as EPM). The controller is designed to monitor the pressure inside the oil circuit.

If the readings deviate from the minimum (maximum) range, an indicator on the dashboard indicates a breakdown. The driver, seeing the warning light, decides whether to stop the car and call a tow truck.

There is no need to ignore the “signals” of the instrument panel, since the technical condition of the car depends on how quickly the driver makes decisions.

Each time the ignition is turned on, the oil pressure indicator on the instrument panel lights up briefly. After 2 - 3 seconds the diode goes out until the engine starts again.

Where is the oil pressure sensor located on the VAZ 2108

Where is it located: in the VAZ 2108 the DDM is installed below the cylinder head cover, on the right in the direction of travel. The upper part of the sensor is covered with a protective cover to prevent current flow to ground.

Before maintenance or replacement, it is recommended to “disconnect” the power terminals from the battery to avoid a short circuit in the on-board circuit.

Note to the driver!!! Follow safety rules when performing work yourself. A hot engine can damage the skin of your hands.

Oil pressure sensor for VAZ 2108: diagnostics, replacement, price, articles

The process of self-diagnosis and replacement is not at all difficult. Do not violate the rules, be careful.

Diagnostic stages:

Open the hood, unclip the block with limit switches on the sensor;
Unscrew the controller (key set to “22”);
Wipe the part dry (rags);
Connect the multimeter terminals to the contacts;
Turn on the device, move to the “Ohmmeter” position;
Measure the resistance. Range from 545 to 628 Ohms. Deviation from the norm is a sign of a malfunction.

Based on the data obtained, make a decision to replace the part with a new one. DDM is not a collapsible structure and cannot be repaired.

Name / catalog article	Price in rubles
Lada 2108-2545213-0 (original)	From 300
Vernet OS3543, OS3538, OS3516	From 270 – 410
Autolog AS2109, AS2102	From 270 – 410
Facet 70096, 70069	From 270 – 410
SWAG 20230002	From 270 – 410
Febi 19018	From 270 – 410
Topran 109894	From 270 – 410
Automega 150011610	From 270 – 410
Ossca 00393	From 270 – 410
Maxgear 210103	From 270 – 410
Meyle 1009190030	From 270 – 410
JP group 1193500100	From 270 – 410
ERA 330341	From 270 – 410

Causes of premature wear of DDM

Expiration of service life;
Damage, consequence of an accident, collision, impact;
Short circuit in the on-board circuit;
Manufacturing defect.

Signs of DDM malfunction

The “oil pressure” indicator constantly signals on the dashboard;
There is an oil leak and signs of depressurization at the controller installation site;
The fastening of the terminals on the DDM is loosened;
The engine oil level does not meet the minimum or maximum range.

Step-by-step guide to replacing DDM yourself

Preparatory stage:

Key to “22”, head, knob;
Additional lighting as needed;
Rags;
New sensor;
Engine oil for topping up (optional).

Replacement steps:

Open the hood of the car. We wait until the engine cools down so as not to burn the skin of the hands;
Using a flat-tip screwdriver, unclip the block with wires from the sensor;
Unscrew the DDM (key to “22”);
We carry out troubleshooting of the seat, wipe it with a rag as necessary;
We screw in the new controller, put on the block with wires;
Check the oil level and replenish the missing amount.

We start the engine and check the functionality of the controller.

What to do if the oil pressure sensor lights up

The light on the instrument panel is on - a clear sign of a malfunction. The causes of failure are varied. It is important to carry out a comprehensive diagnosis step by step.

The light does not go out for a long time: the engine oil level is below normal. Stop the engine and check the actual level with a dipstick. Add the missing amount. Do not exceed the maximum level mark.
The indicator lights up periodically when the car is stationary: the car is installed “at an angle”, which is why the DDM detects a lack of fluid.
Driving alarm indication: fluid level is below average. Add oil above the average level.
The indicator lights up for at least 15 - 20 seconds after starting the engine: a similar sign is typical after changing the oil when starting the engine for the first time.
The indicator is constantly on: the sensor has failed due to a short circuit in the on-board circuit. Use a multimeter to check the integrity of the on-board circuit.

The manufacturer's recommended oil pressure is 0.6 kgf/cm2 at 850 - 950 rpm idling.

Sources used:

https://vaz-russia.com/remont-vaz-2108/zamena-datchika-davleniya-masla-na-vaz-2108-vaz-2109-vaz-21099.html
https://zapchasti.expert/datchiki/datchik-davleniya-masla/datchik-davleniya-masla-vaz-2109.html
https://expertvaz.ru/2109/datchik-davleniya-masla-neispravnosti.html
https://zapchasti.expert/datchiki/datchik-davleniya-masla/datchik-davleniya-masla-vaz-2108.html