Where is the VAZ 2109 oil pressure sensor located and its malfunctions

Where is the oil pressure sensor located on the VAZ 2109 carburetor?

All owners of the VAZ-2109 must monitor the oil pressure so that the internal combustion engine operates normally. DDM is a device that monitors the oil level in the engine. When there is no oil pressure, the red indicator light, which is located inside the car on the instrument brush, lights up. Where is such a sensor located? Its place is in the engine compartment of the engine. Engine lubrication and pressure sensor do not depend on whether a carburetor or an injector is installed in the engine.

Where is the oil pressure sensor located on the VAZ 2109 carburetor?

Device

The device in question may schematically look like this:

Main elements of the oil pressure sensor:

frame;
wire connection location;
thread for fixation in the cylinder block;
diaphragm;
a spring that resists deformation of the diaphragm;
positive and negative contacts.

The oil pressure sensor is located on the left side on the back of the engine. This makes it fairly easy to diagnose or replace.

Does the VAZ-2109 oil pressure sensor work?

To determine if it is correct, you need to check the engine oil level. To do this, you need to open the hood and pull out the dipstick. In order to check more accurately, you need to do this:

drive into a pit and remove the protection;
get close to the sensor;
turn on the ignition;
disconnect the power cord;
Use a voltmeter to measure the voltage between the block and ground. It should show 12 volts.

If there is no voltage, then there may be a problem in the contact or a broken wire.

VAZ oil light is on

The oil pressure warning lamp on the instrument panel is designed to monitor the oil pressure in the engine lubrication system. When there is no oil pressure, the light should be on; when the engine is started and the oil pump supplies oil to the lubrication channels, the light should go out.

How can it happen that the warning light comes on even when the engine is running?

Why does the oil pressure light come on when the engine is running?

Insufficient or absent oil circulation in the engine lubrication system.
Electrical circuit malfunction

In any case, if the warning light comes on, you must immediately turn off the engine. The reason is unknown and if it is a lack of oil pressure, then even short-term operation of the engine without lubrication can lead to dire consequences.

Why is there no oil pressure?

Oil pump malfunction. If the oil pump fails, then there will be no oil pressure.
Clogged oil filter.
The oil intake screen in the engine crankcase is clogged.
Due to a low oil level in the engine crankcase, the oil pressure in the system may drop.
Engine speed is less than rated idle speed. The oil pressure sensor is set to a certain pressure value, and in the case of low pump performance, the pressure in the system will actually be lower, which is what the sensor will show.

All of the above points are the reasons for the real lack of oil pressure in the engine lubrication system. However, sometimes there is actually oil pressure in the engine, but the light is still on. In this case, there is a problem in the car's wiring.

Wiring Problems Causing Oil Pressure Light to Come On

The sensor itself is faulty. Checking whether the sensor is working or not is quite simple. You need to remove the tip from it and, with the ignition on, touch the ground. If the light goes out, the sensor is faulty. The fact is that the sensor inside has a membrane, which, in the presence of oil pressure, bends and closes the contacts inside the sensor. They do the same thing when checking - with the sensor folded down, they imitate its operation by closing the contact to ground.
Poor contact between tip and oil pressure sensor. In this case, it is necessary to clean the contacts with sandpaper.

VAZ-2109 owners check the sensor in different ways:

First.
Remove the DDM located above the oil filter, turn the starter, the engine cannot be started during such a check. If all is well, oil should flow out. Then visually check the condition of the sensor. If there is no damage, then wash it with gasoline. They are installed in place. The light will go off. If it continues to burn, then it needs to be changed. Second. Check the oil level. If it’s low, add lubricant, then check again whether the light is on or not. Next, warm up the engine and then turn it off. Then connect to a pressure gauge. This adapter from the pressure gauge is screwed into place of the sensor and grounded through the ground of the car. Connect the signal LED to the battery positive and the sensor, start the engine and step on the gas. When the pressure gauge reads 1.2-1.6 bar, the LED goes out. If it lights up, then the DDM is broken.

The car owner must always monitor the condition of the DDM. After all, he also has problems. And these problems can affect the technical condition of the machine. You should not allow breakdowns, because if the engine jams, this will lead to large financial expenses.

What you need to know about DDM?

If the indicator lights up indicating low oil pressure, this does not always mean that there is not enough lubrication in the system. It is possible that the DDM is faulty. In order to find the true cause, you need to know what the device is and how it can be checked.

Purpose and location

The DDM consists of a housing, a membrane and a transmitting device. The membrane becomes deformed when oil begins to press on it. Deformation of the membrane is reflected in the rheostat, whose resistance changes. The ECU records changes and reflects them thanks to an indicator on the instrument panel. The controller on the VAZ 2109 is located under the oil filter on the cylinder head on the side where the carburetor is located.

DDM location

Diagnostic features

Before diagnosing the DDM, you should check the oil level in the system using a special dipstick and an oil filter.

One of the simplest diagnostic methods is to check the presence of pressure in the lubrication system. To do this, you need to unscrew the DDM from the socket and manually turn the crankshaft several times. If grease flows or splashes out of the socket and the control light remains on, this means that the pressure is OK and the cause of the malfunction is in the controller.

The process of unscrewing the DDM from the socket

Next, you should visually inspect the device itself. If no mechanical damage is detected, it must be cleaned with gasoline and screwed into the old place. If after this the light does not go out, this indicates that the device is broken and must be replaced.

For the second method of checking, a pressure gauge is required. The controller is removed from the warm engine and screwed into the pressure gauge; the adapter from the pressure gauge is screwed into its place. The control LED is connected to the positive terminal of the battery and the controller contacts. Then the running engine should gradually pick up speed until the pressure gauge shows a value of 1.2-1.6 bar. If the controller is working properly, the LED will go out. Otherwise the device is faulty.

Replacement instructions

To replace the DDM with a VAZ 2109, you will only need one key for “21” and a new device (the author of the video is Avto_Remont).

The procedure consists of a sequence of steps:

You need to start work by disconnecting the negative terminal of the battery.
Next, you need to disconnect the supply wire from the lubricant pressure controller.
Then use the key to “21” to unscrew the faulty device.
For sealing, aluminum foil in the shape of a ring is placed in the sensor socket.
Now the new device is screwed in.
All that remains is to connect the wire, and this completes the procedure.

Thus, there is nothing complicated in replacing; more time is spent on diagnostics.

Replacing the oil pressure sensor VAZ 2109

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.

On a note

Don’t fall into a premature panic, draw too hasty conclusions, drive to a service station and pay money for faults that might not even exist! An emergency pressure lamp indicates a drop in lubricant pressure in the system, insufficient oil level in the engine, but it is not yet a fact that this is the reason. A fairly common malfunction is when the oil pressure sensor itself has failed and, accordingly, simply “lies.” If you don't notice this right away and don't understand the reason, you can really waste a lot of money or cause yourself more serious problems.

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.

Principle of operation

While the engine is running, the oil pump drives oil with the necessary force along a special oil line into which the sensor is built. Having high pressure, the oil presses on the diaphragm in the sensor and displaces it, thereby opening the contacts. At the same time, the indicator on the dashboard goes out.

If there is insufficient pressure, the sensor diaphragm does not move and, accordingly, the contacts do not open. In this case, the indicator lights up and the driver learns about the malfunction.

The VAZ 2109 oil pressure sensor has an electronic emergency operating principle. That is, it is more like an oil level sensor. It transmits information only about sufficient or insufficient level and pressure, without conveying their exact value. This feature distinguishes it from another type of sensor - a mechanical one, which is capable of indicating the degree of pressure created in the engine crankcase.