Oil pressure sensor VAZ 2112 16 valves signs of malfunction

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VAZ 2112 (16V) Sometimes (more and more often, and more and more brightly) the low oil pressure lamp comes on at full intensity.
Moreover, it lights up more often at idle speed of an already warmed-up engine. Synthetic oil Esso 5W40 lasted 12 thousand. I had already read in a book about the possible reasons for this behavior of the light bulb, but before I started troubleshooting, I wanted to listen to the opinions of experienced people. PS In a used car

30 thousand has already happened: - the ignition module has failed - the air flow sensor has failed - the PXX has failed - the hose has broken - and all the antifreeze is on the asphalt. Isn’t that a bit much for “childhood” diseases?

VAZ 2112 (16V) Sometimes (more and more often, and more and more brightly) the low oil pressure lamp comes on at full intensity. Moreover, it lights up more often at idle speed of an already warmed-up engine. Synthetic oil Esso 5W40 lasted 12 thousand. I had already read in a book about the possible reasons for this behavior of the light bulb, but before I started troubleshooting, I wanted to listen to the opinions of experienced people.

PS In a used car

Not sure if the oil pressure sensor is working correctly. But even if everything is fine with it, IMHO it’s time to change the oil and filter.

But other than replacing the IAC on my car for 154 thousand, nothing changed from what you had for 30 thousand

Source

The light comes on during the cold season

The cause of the low oil pressure warning light on VAZ engines can also be negative ambient temperatures, but this is a completely normal phenomenon. This happens because the oil drains from all channels overnight and inevitably thickens. When the engine warms up, the warning light should go off. Therefore, during a “cold” start, the engine needs to fill all the lines and create the necessary pressure (what to do if there is no pressure in the engine?). Since the oil reaches the most important parts much earlier than the oil pressure sensor, wear on these parts is eliminated. During winter startup, the light can remain on for up to 3 seconds continuously.

Oil pressure sensor VAZ 2112

If the oil pressure light suddenly comes on, then one of the causes of this ailment may be the emergency oil pressure sensor. In this article we will figure out how to determine the causes of the malfunction and how to replace the oil pressure sensor with your own hands.

Replacement

It is necessary to remove the decorative trim of the engine.

Next, remove the protective cover from the sensor and disconnect the wire.

Using a 21 mm socket wrench, unscrew the sensor itself and remove it.

Installation is carried out in the reverse order; it is also worth changing the aluminum O-ring.

After installing the new sensor, you need to check that oil is not leaking from under the sealing ring.

If after replacing the sensor you notice that oil is leaking from under it, then it is quite possible that you were sold a defective sensor.

Lit

The oil pressure at idle (approximately 800 - 900 rpm) should not be less than 0.5 kgf/cm2. But sensors for measuring emergency oil pressure come with different response ranges: from 0.4 to 0.8 kgf/cm2. And if a sensor is installed on the car, for example, with a response value of 0.7 kgf/cm2, then even at 0.6 kgf/cm2 it will turn on a warning lamp, signaling a kind of emergency oil pressure in the engine.

Simply put, if the light comes on, this means insufficient oil pressure in the engine. As a rule, the light lights up only for a few seconds and does not pose a great threat to the motor. For example, it can light up when the car rolls strongly in a turn.

First of all, when your oil pressure light comes on again, check for the presence of oil in the engine. If the engine oil level is below normal, this lamp may come on.

This problem can be solved very simply - you need to add oil to the engine to the required level. If the light goes out, we’re happy and don’t forget to add oil on time, otherwise it could result in serious problems.

Also, this situation occurs when the engine oil is changed to new one. After the first start, the oil pressure light may come on. If the oil is filled normally, then it should go out after 10-20 seconds.

Source

Reasons for the lamp to light up

Some drivers do not pay any attention to the light of the oil pressure light, even if it is constantly on and they act very carelessly. After all, problems with the lubrication system are the most dangerous for the engine, since they can cause severe damage to the engine and lead to major repairs.

Experienced owners take oil pressure warning lights very seriously.

Lack of lubricant, malfunction of the oil pump or its bypass valve will lead to “oil starvation”, due to which the friction between the components will increase significantly and ultimately lead to seizing of the components.

Restoring the power plant after this is not only difficult, but will also cost significant costs.

There are several reasons for the warning light to come on, but in any case, immediate action must be taken.

In this case, it should be noted under what conditions the control gave a signal because it can only light up at idle, and immediately go out when the speed increases.

The lamp can blink or glow constantly in all modes. This may tell you where to look for the cause.

Lack of oil.

So, one of the most common reasons for a signal from a pressure sensor is insufficient amount of oil in the engine. This is usually manifested by the light of the lamp at idle.

Due to low engine speeds, the pump is simply not able to supply oil to all rubbing surfaces due to its lack.

As the speed increases and as the lubricant warms up, it begins to circulate faster and the pressure in the system increases, to which the sensor reacts and the lamp goes out.

Reducing the amount of lubricant is a common phenomenon. Among motorists, this phenomenon is called “the engine takes oil.” It is inherent in all engines, both new and worn.

An engine in a car with no mileage, or one that has been overhauled, consumes a small amount of lubricant and this is almost imperceptible. A worn-out power unit can “take oil” in considerable quantities - up to 1 liter for every 1 thousand km.

Therefore, when the oil pressure control lights up, first of all we stop the engine, inspect it for lubricant leaks, wait a while for the glass to lubricate into the pan (usually 2 minutes), and then measure the level.

If necessary, adjust the amount of oil to the level, and then start the engine and make sure that the control goes out.

If there is no liquid on hand to top up, the car should not be operated under any circumstances.

Sensor, filter.

The second, no less common problem is the failure of the sensor itself. This also happens, and he begins to “live his own life,” closing and opening contacts for no reason. In this case, the lamp lights up in any mode, without any systematicity.

The simplest way to check it is to sharply increase the speed to 4-5 thousand, while the amount of lubricant should be normal.

If the lamp does not go out at such speeds, the problem is solved by replacing the control sensor.

The lamp may also light up when using a fake oil filter. The fact is that this element should always contain a small amount of oil. Even if the engine is not running.

Oil pressure sensor VAZ 2112

The oil pressure sensor is a fairly important part in any car, thanks to which it is possible to monitor the oil level in the engine and the pressure created by it, as well as take all necessary measures if the system for some reason begins to fail.

In the case of a VAZ-2112 car, you can find the oil pressure sensor on the left side of the engine with 16 valves. The element is located on the end surface of the housings near the camshaft bearings. This part serves to transmit information to the driver about the condition of the oil in the engine, namely its pressure in the system.

Below is a table that lists the common DDM installed on the VAZ-2112, as well as the article numbers and prices for them.

Sensor	vendor code	Cost, in rubles
Oil pressure sensor Lada 2112	0124325089	200
Oil pressure sensor (BCG)	OS3530-BCG	150
Oil pressure sensor (FKQ) Vernet	OS3518	150

How does the oil sensor work and why can it fail?

Now let's consider the situation if you are on the road and the low pressure indicator has triggered. The very first thing you need to do is stop the vehicle and turn off the engine. As soon as it cools down, you will have to check the lubricant level in the system. There is a special dipstick under the hood for this purpose. It is wiped dry and immersed in its original place. It is quite possible that the level will be below the minimum level. This means that somewhere there is a leak or depressurization of connections. You can set off again only after adding oil to the engine. If the lamp continues to light after starting and does not go out subsequently, it makes sense to think about towing the car to the nearest service station or to a trusted auto mechanic. The matter may turn out to be quite serious, so it is advisable to conduct the examination in a calm environment. Since we have already said that the causes of low pressure may be associated with a faulty sensor, it would be useful to understand the principle of operation of this device. There are certain contacts inside it. Until the ignition is turned on, there is no pressure in the system, so the contacts are closed. When you turn the key and turn on the ignition, but before the starter starts, the warning lamp should be on. If this does not happen, then there may be some kind of malfunction. Maybe the light bulb itself simply burned out, or maybe the contacts were broken or the sensor itself failed. As soon as we start the engine, the contacts open, leading to the light bulb going out.

Check and replacement

During operation of the VAZ-2112, various malfunctions may occur. For example, the oil pressure sensor may fail. However, before drawing conclusions about the causes or presence of a possible breakdown, you should first check the functionality of the device.

The check is performed as follows:

First of all, check the circuit connecting the DDM and the control lamp. To do this, take the sensor wire and lean it against the surface of the engine. At the same time as this action, you should see if the light on the dashboard is on. If the lamp goes out, then the wiring is fine and the problem is really in the sensor.
The next step is to remove the device from the vehicle for a visual inspection. The first sign of a breakdown is the presence of moisture on the sensor.

If the DDM turns out to be dry and everything is in order with the wiring, it is recommended to look for the problem elsewhere. For example, the malfunction may be in the oil level or its quality. You can also replace the oil filter if necessary.

There is another way to check the functionality of the sensor in the VAZ-2112. It is considered more reliable and proven. In this case, you will need to use a pressure gauge, and the sequence of actions will look like this:

First of all, it is necessary to warm up the engine until it reaches operating temperature, and then turn it off.
Next, you need to unscrew the sensor from the car and screw in the pressure gauge in its place.

The ground wire of the pressure gauge will need to be connected to the ground of the vehicle.
After this, you need to connect the control LED to the battery.
The next action is to turn on the engine and press the gas pedal. In this case, it is necessary to take into account that the speed rises gradually.

When the action is completed, you should carefully monitor the pressure gauge and LED. If the device readings reach 1.2 and 1.6 bar, but the LED does not go out, then the sensor is faulty and needs to be replaced.

To carry out the replacement you will need:

Stock up on the necessary tools, as well as a new sensor.
Disconnect the wires from the old device.

Unscrew the sensor using a wrench.

Remove the unit. In this case, during the dismantling process, you should pay attention to the fact that the sealing ring should come out along with the sensor. It will also need to be replaced.

Install a new sensor.
Check the contacts and clean them if necessary, then connect the wires.

When all the steps are completed, you can start the engine again and check the serviceability of the sensor.

It is worth noting that during replacement a little oil may leak out of it. In this case, you should pay attention to what kind of sensor was installed before and conclude that it may have been defective.

Oil pump pressure reducing valve failure - repair or replacement?

Repair work begins with disassembling the pressure reducing valve. Removing the cover and removing the spring is not difficult, but removing the valve itself usually becomes difficult. In order to do this, you will need the following tools:

anchor bolt M8 (length 90 mm);
nut for wrench 10;
open-end wrench.

The anchor must be inserted tightly into the plunger, and then the nut must be screwed onto it. After this, take the wrench and continue tightening the nut. After some time, the piston will break off and you can remove it.

To disassemble the mechanism you need to remove the cover, remove the spring, and then the valve itself.

In the absence of the above tools, some craftsmen come up with their own ways of dismantling the valve.

Video: how to remove the valve using a wooden stick

The repair of this mechanism itself depends on the cause of the breakdown. If the problem was low pressure, you should replace the spring

It is very important to find the same part that was before

Please note that the sizes of pressure reducing valves and their components differ for different car models. We recommend that you consult with a specialist before purchasing a part, and come to the store with a disassembled mechanism

The spring for the pressure reducing valve must be sufficiently elastic

If the valve becomes clogged and stops reducing pressure inside the oil pump, carry out the following procedures.

Clean the part thoroughly, paying particular attention to the oil passages. Wash the mechanism in gasoline. Lubricate the dried part. Place the valve in its place. Now you need to check the pressure. A regular pressure gauge is used for this.

The hose with a threaded fitting must be screwed into place of the standard pressure sensor, and then start the engine. You need to find out the values acceptable for your car in the engine manual. For most cars they range from 1 to 4.5 kg/cm2 at medium speeds.

After installing the valve, be sure to check the pressure with a pressure gauge

Typically, experts recommend replacing the valve if major repairs have been carried out before. It is believed that ordinary cleaning and rinsing cannot cope with small chips. It is also worth replacing if you find mechanical damage on the surface of one of the valve components.

Repairing and replacing the pressure relief valve affects the overall performance of the vehicle. And this is not only clearly visible, but also clearly audible while the engine is running.

Video: differences in engine sounds before and after replacing the pressure relief valve

Before disassembling the oil pump and its pressure relief valve and carrying out any work on them, make sure that you are confident in your own abilities. Inaccurate actions can lead to final failure of parts. It will be especially disappointing if the problem was not in the valve, but in other elements of the system, and you have to change a working part. If in doubt, it is better to seek the help of specialists at a car service center.

What to do if the sensor lights up

While the VAZ-2112 is operating, the oil pressure light on the dashboard may light up periodically.

The main causes of the malfunction are:

decrease in engine oil level;
electrical circuit break;
sensor failure;
failure of the oil filter;
clogging of the oil receiver structure.

Since there are many possible reasons, you will need to check each of them. First of all, the car owner should inspect the engine oil level, since this reason is considered one of the most common.

To do this, you will need to turn off the engine and give it time to cool, after which you will need to inspect the pan for the amount of oil that has leaked out. If the level is OK, then you should start checking for another reason, and it is best to entrust the work to professionals at a service station.

Thus, the operation of a car, especially a domestic one, requires a responsible and attentive attitude on the part of the owner.

If you regularly inspect all elements, systems or various devices, which include the oil pressure sensor, you can avoid any serious breakdowns and, as a result, costly repair work.

Source

How to determine the malfunction?

The oil light on the instrument panel came on. This is a bad sign!

Usually the light on the instrument panel will light up first if there is something wrong with the pressure. As long as it does not burn, the pressure is most likely normal. If the pressure is not all right, the engine noise will increase. The earbuds will also start to knock. This will be clearly audible when the engine speed exceeds 3,000.

Consequences

If the liners rattle, then you will need to disassemble the engine and grind the crankshaft. But sometimes sanding may not be necessary. All parts of the cylinder head are most susceptible to damage. In this case, the motor will stall. Then the camshaft will begin to collapse.

Types of DDM

Oil pressure sensors are divided into two types:

Mechanical. They are used on cars that have become legends in the automotive industry, in particular, VAZ 2101, UAZ, Moskvich 401/407/412/, 2141 and others.
Electronic. Installed on all modern cars, for example, domestic VAZ 2114, Kalina and other Lada models, as well as foreign cars.

Mechanical sensors

Mechanical sensors by design are divided into:

Devices with two rods and a capillary tube.
Devices with a rheostat.

The first ones consist of a body, a membrane, two rods, and a sealed tube.

As the pressure in the lubrication system increases, the membrane bends, putting pressure on the first rod, thereby increasing the pressure in the tube. The second rod takes this pressure and transmits it to the differential pressure gauge (located on the instrument panel).

The pressure increases - the arrow of the device deviates in a larger direction, falls - the arrow goes down to the left. The principle of operation is the same as that of a pressure gauge.

The mechanical oil pressure sensor with rheostat consists of:

Cases.
Membranes.
Slider.
Nichrome winding (resistor).

The device operates on the principle of a voltmeter. The rheostat and slider play a key role here.

The rheostat changes its resistance depending on where the slider is moved. The latter, in turn, shifts in one direction or another as the membrane bends or straightens.

When there is no pressure, the membrane is not deformed and the slider does not move, the current passes freely without encountering any resistance along its path.

As the pressure increases and the membrane deforms, the slider moves along the rheostat, thereby increasing the resistance in the circuit; accordingly, the current readings change, which is displayed on the device in the driver’s cabin.

All this is recorded by the ECU, to which the sensor is connected. It is programmed in such a way that only one period of current values is equal to the standard oil pressure. Exceeding this interval is equivalent to an incorrect value.

This is clearly visible on dial analog pressure gauges, which, in fact, are ordinary voltmeters.

Electronic sensors

Electronic DDM is much simpler than its mechanical counterpart, so it is considered more reliable.

Essentially, this is an emergency sensor that does not show the pressure in the system, but only notifies the driver when it is within normal limits and when it is not.

Principle of operation. When pressure is not applied to the sensor membrane, it is not deformed. The rod is in a position in which the circuit contacts are closed and current flows through them. At this moment, a lamp is lit in the cabin, which is monitored by the driver.

When the engine starts, the oil pressure in the system increases, the membrane bends, the rod moves, opening the circuit. The light goes out.

If after starting the engine the lamp does not go out within 1-2 seconds, you must immediately turn off the engine and do not start it until the cause of the malfunction is determined.

Read more here - what to do if the oil pressure lamp is on https://autotopik.ru/remont/1062-gorit-lampa-davleniya-masla.html.

Based on the above, we can conclude that the basis for checking the oil pressure sensor on modern cars is measuring the resistor resistance with a multimeter and checking the DDM for opening and closing the circuit.

To do this, the multimeter is switched to resistance or continuity measurement mode. It depends on what type of sensor is being tested with or without a resistor.

But there are other verification methods, which we will discuss below.

Lost oil pressure at idle. — Community “Lada Priora Club” on DRIVE2

Good day everyone, another problem has happened and we can’t solve it in any way. In general, they made the head, changed the guides, then ground in the valves and installed Reserve seals. We reassembled it and the engine began to emit blue smoke, but not always. Sometimes when heating up at idle there was a lot of smoke, it was decided to change the valve seals, we bought Victo Rains seals and immediately left the Prima rings. Since the old ones had gaps and oil leakage on the 2nd and 4th piston. After assembly there was no smoke at all, but when warming up the oil pressure lamp blinked, checked with a mechanical pressure gauge, it showed 0.5 kg at idle at a temperature of 95 degrees. And so it was made. We replaced the oil and filter, the oil receiver and removed the oil pump, measured the pump with a micrometer and it even looked to be in excellent condition. The main liners have not been replaced, but visually they are free of scuffs and scuffs. Next we measured the camshaft journals, the intake one near the oil seal was 23.92 mm and the rest up to 23.95 mm.

In general, I replaced both shafts, since there is nothing left to think about. As a result, the pressure did not improve. The pressure reducing valve holds, but not for very long; when warming up, the compensators begin to knock. That's all we can do... give us some more advice on what and how to check.

Today, purely for the sake of my own curiosity, I bought a set from a VAZ 2106 (pointer, sensor, etc., etc.) installed and connected, as a result, when warmed up at xx, it presses 3 (well, maybe 2.7), at 3000 rpm 4 with kopecks at 5000 about 5 s half

I can’t vouch for the accuracy of the measurements, what I see is what I’m writing, I think everyone has seen the pressure indicator in the wheel.

mileage 5000 km car for half a year oil shell helix hx7 10w-40 I'm going to switch to helix ultra

Or maybe just screw a threesome in there and that’s it? How reliable is this one from 2106? install a standard pressure switch and plug the other end. When should I insert a pressure gauge there? So as not to jerk back and forth.

The standard set is available almost everywhere, I bought it for 120 rubles (banjo, fitting, medical gasket). There was a plug on the banjo for a long time. This set is more convenient because... similar to constructor - any combination of installation.

Here it is at a more attractive price https://www.aliexpress.com/item/New-Blue-Oil-Pressure-Adaptor-Temperature-Temp-Gauge-Filter-Sandwich-Plate-Sensor-1-8-NPT-Free/ 1052442796.html

Warm up engine oil Zic+10-40 at idle a little more than 1 At, 3000 - about 3 At

Found in the forum archives: The oil pressure in the area of the pressure sensor on the VAZ-21126 engine should be at least 1.2 (kgf/cm2).” Department for analyzing the quality of vehicles in operation. Leading process engineer. Nikolai Nikolaevich Gapchenko

This means at any temperature, unless otherwise specified, moreover, it turns out that in any case.

Warm up engine oil Zic+10-40 at idle a little more than 1 At, 3000 - about 3 At And how much on a not warmed up (20.60*C) internal combustion engine? The oil pressure in the area of the pressure sensor of the VAZ-21126 engine must be at least 1.2 (kgf/cm2).” Those. if you look below for the causes of low pressure.

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.

When the engine heats up, the oil pressure lights up: consequences for the engine

Let's start with the fact that any problems with lubricant pressure mean that the power unit is experiencing oil starvation. Simply put, the rubbing surfaces do not receive enough motor oil and their wear begins to increase. Oil also plays the role of a cleaner and cooler, washing away wear products and lowering the temperature in the area where the surfaces of rubbing pairs work.

Also, when the efficiency of the oil system decreases, knocks and noises appear in the engine, which subsequently lead to more serious damage or even engine seizure. In this case, jamming may well be accompanied by a “fist of friendship,” which greatly complicates the repair of the damaged unit and increases the overall costs of restoring the internal combustion engine.

Where is the sensor located

The most common places where it is found are near the oil filter, in the upper part of the engine near the camshaft block, or pump.

Let's look at specific models:

VAZ 2108/09/099. Located on the top right side of the engine (when viewed in the direction of travel) next to the timing belt cover. There is only one wire coming from it. This arrangement is also typical for 8-valve engines on the VAZ 2110/11.
VAZ 2110/11 16 valve engine. Located on the left side of the engine (when viewed in the direction of travel) on the driver's side on the camshaft block between the air filter, ignition module and oil filler neck.
VAZ 2112, 16-valve engine. It is located on the top left side (look along the way). To find it you need to remove the air filter.
VAZ 2114. Located on the right inner side of the engine on the cylinder head next to the timing belt. It is clearly visible from above. To dismantle it, remove the protective cap, the terminal and turn it out with a 21 key.
Lada Kalina. Located on the right rear of the engine near the timing belt, one wire comes from it. To get to it you need to remove the plastic cover of the cylinder block.
Lada Priora. Located on the left (when viewed along the way) on top of the cylinder block under the intake air manifold. To dismantle it, you must first remove the protective plastic cover of the engine, move the air manifold and unscrew it with a 21 mm socket wrench. It sits very tight.
Lada Granta 8 and 16 valve engine. Located on the top right side of the engine near the timing belt cover

. To remove it, you can use a spark plug wrench or a 21 open-end wrench.
GAZ "Gazelle" (engine ZMZ-405). Located on the BC, top right. There is only one wire coming from it.

The most common wrench size for removing the sensor is 21. You can use a spark plug wrench. But it all depends on the specific brand of car.

After the pressure sensor has been removed, the seat is tightly covered with a clean rag so that dirt does not get there and oil does not leak out during possible engine operation.

It would be a good idea to measure the oil pressure in the system at idle, medium and high speeds. To do this, use a pressure gauge, which is screwed in instead of the DDM. To take accurate readings, it is important to ensure a tight connection.

For each car model, the values may differ. These can be found in the instruction manual.

For example, for a VAZ 2112 there are 16 valves, the standard engine oil pressure is:

at idle speed 2 BAR.
at 5 thousand revolutions from 4.5 to 6.5 BAR.

If all the readings are normal and the light is constantly on, then the information does not reach the ECU or gets distorted. This may be due to the sensor, which needs to be checked.

Oil filter

A clogged and worn oil filter invariably leads to a decrease in oil pressure in the system. In a serviceable, correctly selected and installed filter, a certain amount of lubricant always remains after the engine is stopped. This is provided for by the design of the device. If the filter is worn out, or does not correspond to the engine modification, oil will flow from it into the crankcase, causing a “starvation” effect in the engine.

When the filter element becomes clogged, its throughput capacity decreases. In this case, the pump operates in normal mode, however, the amount of oil entering the system is reduced. Naturally, this leads to a drop in pressure. If you are unsure whether the installed filter matches the engine parameters, or the car with it has traveled more than 7 thousand km, replace it. A new filter unit for a VAZ 2110 will cost you about 200 rubles.

Important: it is advisable to replace the filter simultaneously with changing the lubricant. When installing a new filter, be sure to fill its housing with fresh oil.

This will prevent the appearance of air locks in the system and protect the engine from oil starvation.

When replacing the oil filter, be sure to fill the filter housing with fresh oil.

Checking the electric oil pressure sensor with a multimeter and a light bulb

The method is suitable for all modern Lada cars, in particular VAZ 2114, and foreign cars. Where there is only an emergency warning about low oil pressure.

In such cars, a sensor is installed that works on the principle of opening a circuit. The pressure is normal - the circuit is open, not normal - it is closed, the light is on.

To check with a light bulb you will need:

The control itself is 12 V.
An electric car pump or compressor, preferably with a pressure gauge. If they are not there, then use a regular foot pump.
12 Volt power supply. You can use a car battery or a computer power supply.

Connect the negative wire of the battery to the ground of the sensor, and the positive wire to a similar wire, but through the control. The light should light up. If not, then the sensor is faulty.

Start the pump or compressor and supply air to the sensor inlet. If the latter is working properly, then the light should go out.

Adjust the pressure using the pressure gauge; it should not exceed 1.5 atmospheres, otherwise the membrane may be damaged. Optimal limits are from 0.5 to 1.5.

When checking with a multimeter you will need:

The device itself is switched to the “dialing” mode.
Electric pump or other air blower.

Connect the multimeter to the sensor, minus to the body, plus to the center wire. The circuit will close and a signal should appear.

Turn on the pump and apply pressurized air to the sensor inlet. Monitor the pressure on the pressure gauge.

The circuit should open and the sound coming from the multimeter should disappear.

Reasons for the oil pressure light to come on and how to eliminate them

Part of the instrument panel is occupied by light bulbs, indicating malfunctions of individual components of the car. The sensors transmit signals to the dashboard, and the corresponding light indication lights up. It is extremely important to notice this indication promptly and take appropriate action.

Reasons for the oil pressure light to come on

The oil pressure light is located on the dashboard. It may come on when starting the engine, idling, or while driving. The reasons for her tanning can be very different. First of all, it notifies the driver of a low oil level or warns of a sensor malfunction. In the latter case, the light is constantly on.

A lit oil pressure light may indicate a low engine oil level.

In addition, the pressure light can give signals about the following.

About the failure of the pressure reducing valve. When the oil pressure is low it closes. However, the light also works in the event of a malfunction or jamming of the damper.
About problems with the oil filter. After stopping the engine, the filter should contain the lubricant necessary for the next start. If the filter is empty, the light comes on.
Oil pump malfunction. The pump is used to supply oil under pressure to the surfaces of the rubbing elements. When it fails, oil is not supplied to the system and the indicator goes off.
About clogging of the engine mesh, which protects it from large particles of debris. If the oil is of poor quality, the mesh quickly becomes dirty. This causes the pressure in the system to decrease and the light comes on.
About a decrease or loss of compression in the engine cylinders due to severe wear of the pistons. Oil consumption increases, the light comes on.
About problems with the crankshaft.
About closing contacts directly connected to the light bulb itself.

These are just a few of many possible situations. However, they all lead to a decrease in oil pressure in the engine crankcase, which is the direct cause of the light bulb. Therefore, it is recommended to periodically check the oil level and monitor the appearance of oil spots under the car when parked.

Video: reasons for the oil pressure light to come on

The light doesn't light up

Sometimes a different kind of problem may arise - the light does not light up when the oil pressure is initially low. It does not light up when you start the engine, although usually when you turn the ignition key it should first blink and then go out.

The light does not light up when the ignition is on

The reason why the indicator does not work when the ignition is turned on is often a short circuit in the electrical wiring. In this case, you should disconnect the wire from the oil pressure sensor (OPS) and short it to the car body.

If the oil pressure sensor is faulty, the light does not light up

Next, there are two possible options.

If the indicator does not light up, the electrical wiring is faulty - the insulation is damaged, the wire is broken, etc.
If the indicator lights up, the DDM is faulty. It should be replaced.

In addition, the light may not light up when the ignition is turned on in the cold season. The fact is that at lower temperatures the viscosity of the oil increases, that is, it becomes thicker. This is precisely what explains the incorrect operation of the oil pressure indicator in winter.

In winter, the engine oil becomes thicker

Trouble-shooting

A faulty oil pressure indicator system can lead to very serious consequences. Therefore, problems of this kind should be resolved immediately.

Necessary tools and devices

To carry out repair work you will need:

new wiring;
light bulb;
set of screwdrivers;
pressure gauge;
multimeter;
new oil pressure sensor.
In some cases, it will be necessary to replace the oil pressure sensor

The list of mandatory work includes replacing the light bulb in the instrument panel, checking the DDM, measuring the pressure and oil level in the system.

Replacing a light bulb

Often the light bulb itself is faulty. Its replacement on the dashboard of a VAZ 2109 car is carried out as follows.

Using a screwdriver with a wide blade, the buttons for dimensions, low beam and emergency signals are removed from the dashboard. The connectors are disconnected from the buttons.
Use a Phillips screwdriver to unscrew the screws securing the instrument console trim.
The screws securing the instrument console trim are unscrewed using a Phillips screwdriver.
The car radio is pulled out and all connectors are disconnected from it.
The metal latches around the perimeter of the visor are pressed out, and the visor is pulled out.
The panel itself is bent or completely removed.
The oil pressure light is replaced with a new one.
Oil pressure light on the dashboard number 21

Diagnostics and replacement of the oil pressure sensor

The oil pressure sensor is usually located on the rear of the engine block. A more precise location can be found in the vehicle's operating manual. When diagnosing a DDM, it is first recommended to carry out an external inspection of it - check the integrity of the case and contacts. Then the connector is disconnected from it and, after cleaning, reconnected. Often this is enough for the sensor to work.

The DDM connector of some cars has a protective rubber cap, which expands due to heat during long-term use. Often this is what explains why a light bulb blinks and lights up for no reason.

A protective rubber cap on the sensor may cause it to not work correctly.

If you find such a cap, you should simply remove it and throw it away as a completely non-functional element.

The VAZ 2106 oil pressure sensor does not have a rubber cap

If traces of oil appear on the DDM, this indicates that the sensor is leaking oil and should be replaced immediately.

The functionality of the DDM can be checked by removing the wire from it and attaching it to the car body. If the light starts flashing and works normally, the sensor is faulty and must be replaced.

To check the functionality of the DDM, the wire is removed and connected to the car body

You can check the DDM using a multimeter. This is done as follows.

The wire is removed from the sensor.
A multimeter measures the resistance between the DDM contact and the motor surface.
If the resistance is close to zero, the sensor is working. Otherwise, it must be replaced with a new one.

Such diagnostics can be carried out using a regular 12 V light bulb with wires. One wire is connected to the battery positive, the other to the DDM contact. If the light comes on, the sensor is working.

Replacing the sensor is extremely simple - remove the old DDM and install a new one. It is better to replace the faulty wiring entirely.

Video: checking the oil pressure sensor

Oil pressure measurement

If the DMM is working properly, you should use a special pressure gauge to measure the oil pressure as follows.

The engine starts and warms up to operating temperature.
The engine stops.
The DDM is removed, and a pressure gauge is connected in its place using an adapter.
Oil pressure is measured using a special pressure gauge
The engine starts again. If the car is equipped with an automatic transmission, it is set to P or N mode.
The pressure is measured and compared with the indicators regulated by the car's operating manual for idling.
Pressure is measured at high speeds (up to 4–5 thousand rpm). The obtained values are again compared with those specified in the instructions.
Oil pressure indicators must match the values regulated by the manufacturer

For example, on a VAZ 2112 model car with a 16-valve engine, the idle pressure should be equal to two BAR. With the gas pedal pressed, at medium and high speeds - 4.5–6.5 BAR.

Low pressure is usually associated with low oil viscosity and antifreeze or fuel entering the engine crankcase. With increased pressure, the oil begins to turn into an emulsion, and antifreeze consumption increases. If the measurements showed a pressure value that does not correspond to the technical characteristics of the car, the DDM should be replaced.

Checking two sensors

Two oil pressure sensors are not uncommon on modern cars. The first one performs a standard function, signaling the presence of working pressure immediately after starting the engine.

The range of its operation (opening the circuit) is 0.15…0.45 atmospheres. It is checked in the same way as we described above.

The second sensor monitors the upper limit of oil pressure when the engine is running. It notifies via light and sound alarms of low oil pressure at high engine speeds.

It works and is tested in the same way as the first sensor, except that:

The air must be pumped with high pressure. It may be different for each brand of car, but as a rule, it is 1.8 atmospheres. For example, on a Volkswagen Golf with a 1.8 engine it is 2.0 - 2.5 BAR. Therefore, it will not be possible to perform a check here with a conventional hand pump. And the car compressor must be connected to the sensor very tightly.
The circuit is not permanently closed, like the first sensor, but rather open. Therefore, when checking, the light (control) should not initially light up, but light up when air is supplied.

Lada 2112 1.5 l 16-cl › Logbook › The oil pressure light blinked at xx.

Hi all! I don’t even know where to start, I’m not in the mood at all. After the last oil change, but not immediately, after driving about 1000 km, the oil pressure light on a warm engine blinked at XX (this was about 7 months ago), I began to panic a little. The first thing, as everyone else probably does, is go to the store and buy an oil pressure sensor. I bought it, replaced it and no use. I went to the store again and bought some

I measured it and it showed about 0.8 at XX. Not enough, at 3000 - 4000 rpm the pressure is about 2 - 2.5. not enough either. I was a little confused. I started calling my friends, they advised me to change the oil pump and bearings, or just fill it with thicker oil and put the engine up for sale, there won’t be any problems! Nooo! I can’t do that and I’m not going to sell. Again to the store for a pump. I bought a pump (I didn’t take the inserts because I didn’t know what they were worth) and went to a friend’s garage to disassemble the engine (no photo, and there was no time to write notes) Well, here we go! I disassembled, changed everything, blew out the channels in the cylinder head and in the knee, drove on my own two for the liners (the liners are standard, the knee has never been sharpened) then reassembled (assembling a 16-cl. engine was such a chore, clean off the sealant, and then re-apply) Launch! The meter is already screwed onto the engine. When cold it showed about 1.5 at XX, if I’m not mistaken, as soon as the engine warmed up to 82 degrees, the pressure light blinked very rarely. oils It's a little better, but not as much as I wanted. So I went home. I was just tired and didn’t know what else she needed. My mother stayed with me like this for about a month. Then he calls and says: I warmed up the car (it was winter or autumn), the light does not go out at XX, when you touch the gas pedal with your foot it immediately goes out. Well, I think, fucked up! Disassemble the internal combustion engine again. I accidentally came across an article on a forum: a man had the same problem as me. He changed the oil injectors and the problem with the light bulb went away. A few days later I bought injectors with the hope that I have them in my internal combustion engine. When I disassembled the internal combustion engine the previous time, I didn’t pay attention to them (I didn’t even know that they were there) Photo from the Internet. Maybe it will be useful to someone.

Mechanical sensor check

On a VAZ “classic” and many other older cars, checking the mechanical oil pressure sensor can be done without a multimeter, but this does not mean that the procedure will be easier as with an electronic analogue.

Electric car pressure gauge.
Manual pump or electric compressor.

Remove the sensor and locate the two contacts on it. The first one is responsible for sending a signal to the oil pressure warning lamp. The second is for displaying readings on the pressure gauge.
You need to understand the pinout of the contacts on the electric pressure gauge. Where are the plus, minus and third wire receiving the signal from the sensor.
We take the mass from the DDM body through the cylinder block.

Let's put together a diagram. We connect the power and supply air from the pump at a pressure of 1…2 atmospheres.

If the sensor is working properly, then on the electric pressure gauge, as the pressure increases, the arrow will deviate upward. If not, the device is faulty.

The oil pressure sensor cannot be repaired and must be replaced immediately. When installing it, the seat is lubricated with heat-resistant sealant.

Look at the turns the oil pressure light comes on and another video

When turning corners the oil pressure light comes on

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THE OIL PRESSURE LAMP IS ON. COMMON REASONS We solve the problem of loss of oil pressure #oil pressure#VAZ2112#lamp.

The oil pressure lamp blinks and lights up when the engine is warmed up to 90 degrees, one of the reasons for 16kL. One of the reasons for low oil pressure on a hot VAZ 2112, Priora engine.

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The hot oil pressure light comes on

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Advice from experienced

It cannot be said that one electronic emergency oil pressure sensor is convenient. The light does not go out, but it is not visible what pressure is in the lubrication system at this moment.

Also, if the oil was not changed on time, different brands were used, and after a major engine overhaul, clots may form in the system, due to which the sensor may not work on time. Oil starvation will occur, which will lead to a decrease in engine life or its wedge.

To solve this problem, experienced motorists recommend installing, in addition to the electronic sensor, a mechanical one with readings displayed on the dashboard through a pressure gauge.

To do this, automobile Kulibins use a special tee (2103-3810610), a fitting (2103-3810310), and two gaskets (10282460), with the help of which a mechanical analogue sensor and a standard electronic one are connected to the lubrication system.

A pressure gauge is mounted on the dashboard in any convenient place. You can take it from any VAZ “classic”, Moskvich or UAZ. The main thing is that the scale is convenient and understandable for you.

The wires from the DDM are placed in a hose or plastic corrugation and carefully mounted in the engine compartment. This must be done in such a way that they do not overheat and are not subject to mechanical stress.

Crankshaft bearings

The pressure in the system may also drop due to severe wear of the main or connecting rod bearings of the crankshaft. This phenomenon occurs on engines that have traveled more than 200 thousand km without major overhaul. Such a malfunction can only be detected after disassembling the engine.

Worn bearings allow more oil to pass through, which affects the pressure in the system

Video: causes and consequences of pressure drop in the lubrication system

Diagnostics of the lubrication system is a rather complex and time-consuming process. But you can’t do without it, especially since the car itself gives you a distress signal. It’s better to waste a day looking for a minor problem and try to fix it than to carry out a major engine overhaul later.

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