Checking the wiring of the phase sensor VAZ 2114 8 valves

Checking the camshaft sensor (abbr. DPRV) allows you to verify its performance and make sure that in engines with phased (sequential) injection, fuel is supplied in exactly the required sequence. Another name for this device is a phase sensor (it is often used by owners of domestic VAZs). The test can be performed using a multimeter in voltmeter mode and/or an oscilloscope. Even a novice car enthusiast can check the camshaft position sensor.

We check the camshaft sensor on a VAZ-2114 using a tester or multimeter

Many motorists have encountered the fact that the camshaft sensor, or in other words, the VAZ-2114 phase sensor, has failed. There can be many reasons for this phenomenon, but as a rule it is wear and tear. Not all car enthusiasts are able to diagnose this sensor, although there is nothing complicated or abstruse in the process itself.

Video review of the symptoms of a camshaft sensor failure on a VAZ-2114:

What needs to be done before replacing the DPKV

When symptoms of a malfunction appear, you need to check several points due to which the control unit is not receiving proper information.

PHASE SENSOR.FULL OPERATION CHECK

HELLO EVERYONE, IN THIS VIDEO I WILL SHOW HOW TO DIAGNOSE A PHASE SENSOR

.THE PROCEDURE IS SIMPLE AND...

Quick check of the phase sensor

How to quickly check the phase sensor

Inspect the DF for external damage.
Make sure that no moisture gets on the contacts.
Check contacts for oxidation.
Make sure that the electrical wiring near the unit is intact.

If nothing was found during a visual inspection, then it is necessary to dismantle the device. How to change the camshaft sensor on a VAZ 2114?

Dismantling any sensor or repairing electrical wiring should always be carried out only with the battery disconnected, otherwise you can complete the repair not only by replacing the burnt circuit, but also by purchasing a new vehicle.

Dismantling on an 8-valve engine is not difficult. Where is the phase sensor located on the VAZ 2114? It is located on the right, on the top of the engine, near the air filter. It is secured with one 10mm wrench bolt. With a few simple movements, the bolt is unscrewed and the sensor is removed. After the unit has been removed, it is necessary to close its structural socket from accidental entry of foreign objects.

Operating principle of the sensor

General view of the camshaft sensor

The camshaft sensor or phase sensor is a part of the main power unit of the car, which is responsible for reading information about the location of the camshaft and is also involved in adjusting the ignition angle.

This meter is similar in principle to a Hall sensor .

Reading occurs using a special camshaft gear that has no teeth. The missing elements are located in such a way that when this gap hits the sensor, the first piston is at the dead center, at the top or bottom.

A signal is triggered and transmitted to the engine's electronic control unit when the sensor hits the missing teeth. In turn, depending on the received indicator, the ECU adjusts the ignition angle. Thanks to the installation of such a system, Samara-2 engines have become more efficient and popular.

Location of the sensor under the hood of the VAZ-2114

The camshaft sensor on the VAZ-2114 is located near the air filter, at a very close distance from the cylinder head. This meter location is almost always standard for other cars in the injection group.

Camshaft sensor location

The main reasons for sensor failure

Before proceeding directly to the diagnostic process, it is necessary to find out the causes of the malfunction of the VAZ-2114 phase sensor.

So, let's move directly to the most direct and indirect indicators:

Electrical circuit of the sensor

Check Engine on the dashboard indicates that a malfunction has occurred. In this case, the engine starts without waiting for a response from the camshaft sensor, and the ignition system works based on the latest indicators.
Increased consumption of the fuel mixture can also serve as an indirect indicator of a malfunction of the air flow control valve.
The car begins to lose power and dynamics as a whole.

The combination of these reasons can serve as an indirect indicator of a malfunction of the camshaft sensor.

Design features and operating principle

The VAZ 2114 FAZ sensor is an integrated device, the main function of which is to receive information about the current operating cycle of the power unit and transmit it to the ECU via pulse signals.

Structurally, the DF consists of two parts - a sensitive element and a pulse signal converter, which in turn consists of an operational amplifier, a bridge circuit and an open collector type output stage.

The DF sensitive element operates according to the Hall principle; it is a microcircuit that responds to fluctuations in the magnetic field, which gains the ability to transmit an electrical signal only when there is a magnetically conductive material next to it, which is the steel head of the valve.

The location of the VAZ 2114 camshaft position sensor is as follows: it is located on the end of the cylinder block, not far from the air filter.

There is a lot of discussion on the Internet about which phase sensor is best to buy from which manufacturer. We recommend giving preference to devices from the German company Bosch. It is she who has the license to manufacture sensors operating on the Hall principle, so, in essence, you get a reliable and durable device produced by the direct owner of the technology by which it is made.

Checking the operation of the camshaft sensor

So, when all the questions have been considered, you can proceed directly to diagnostic operations.

The first method is manual diagnostics . How is it carried out? Let's consider this issue step by step:

We dismantle the sensor.
The first diagnosis is visual. It is worth inspecting the condition of the case, the presence of damage and cracks.

Sensor wire pinout

Multimeter to help

Now you need to check the contact group using a multimeter. First, we inspect the contacts for the presence of moisture, and then “ring” them. If the tester does not respond, then the sensor is faulty.

Diagnostics is carried out as follows: the “minus” probe of the tester is connected to the left contact on the sensor, and the “plus” to the central one. Next, we bring the metal plate to the sensor. A change in the voltage reading on the sensor will be immediately visible on the multimeter.

Checking the sensor using a multimeter

The second diagnostic method is to connect to the vehicle's electronic control unit. In it, when the Check Engine appears, error codes remain that indicate a malfunction. There are two errors associated with the phase sensor, namely:

FAZ sensor error 0340 - shows that the ECU does not receive a signal from the camshaft sensor. You should check the breakage and condition (oxidation) of the contacts before damaging the sensor itself.
Error 0343 - high signal level of the camshaft sensor. Most often this is damage to the wiring from the ECU to the sensor, or breakage and oxidation of the terminals, or an unreliable connection.

Working principle of the camshaft sensor

Oscilloscope

The third method of diagnostics is an oscilloscope. Using this device, you can almost immediately determine whether the camshaft sensor is faulty. But, unfortunately, not every car enthusiast has this device in his arsenal.

Checking with a computer or oscilloscope

Visual inspection

As a rule, in most cases, a visual inspection of the VAZ-2114 car is enough. You can even check the camshaft sensor this way. Many drivers do not look under the hood, so wires often break, the device body is destroyed, etc. Before starting repairs, make sure that the breakdown is fatal and only replacement is necessary. This work takes place in several stages:

First of all, inspect the phase sensor. Look for mechanical damage on it. If there are cracks or chips, change the device immediately.
Inspect the contacts used to make the connection. If there is rust or moisture on them, remove it. Check functionality. Very often the cause of poor performance is lack of contact or moisture on the plugs. The same goes for oxidation.
Check the wiring for breaks and shorts.

Signs of a faulty phase sensor on a VAZ 2114

Checking the phase sensor of a VAZ 2114 with an 8-valve engine is possible using a multimeter. Signs of a malfunction may vary from person to person. Most often, failure of the DPRV is manifested by the following symptoms:

Difficulty starting the engine, regardless of its temperature. This is due to the formation of an incorrect composition of the air-fuel mixture.
Incorrect operation of the power unit at idle. Car owners note the lack of stability in the operation of the power unit at idle. This symptom is explained by the fact that the electronic control unit, due to the lack of data from the DPRV, cannot correctly select the ignition timing.
Slow response to pressing the accelerator pedal. Reduced dynamic performance of the vehicle. The symptoms are due to the fact that the electronic control unit has selected the wrong air-fuel mixture. The symptom is especially noticeable when shifting to a higher gear.
Fuel consumption increases significantly. Incorrect operation of the gas distribution mechanism and the lack of information supplied to the control unit make it impossible to correctly select the air-fuel mixture. Supplying a large amount of gasoline leads to excessive consumption.
Spontaneous stopping of the power unit at idle speed. This is especially common when the engine is not warmed up. This indicates that the ECU has selected the air-fuel mixture too lean.
There is a dip when you press the gas pedal sharply. The ignition timing is incorrectly adjusted.

The vehicle owner can independently determine the failure of the DPRV based on the above signs. If symptoms appear, replace the part with a known working part. In some cases, it may be necessary to additionally check the functionality of the wiring.

How to check the phase sensor on a VAZ 2114?

Before checking the VAZ 2114 phase sensor with a multimeter, you must first inspect the part for damage. If there is visible mechanical damage to the product body, it must be replaced with a known working one. If there are no cracks or chips, diagnostics are carried out in the following order:

Remove the phase sensor from the car. To do this, disconnect the electrical connector and unscrew the fasteners securing the products in the seat. To speed up the process, you can use a ratchet head.
The multimeter switch is set to DC voltage measurement mode. For testing, select a range of up to 20 volts.
Measure the voltage at the positive and negative contact pads of the electrical connector. With the ignition on, the multimeter should show the presence of constant voltage.
Connect the positive and negative contacts to the battery. At the same time, the voltage applied to the part is measured. It should be between 12-14 volts.
The multimeter is connected to the positive and signal pads, and readings are taken. The voltage between the positive signal contact must be at least 90% of the supply voltage.
Bring a metal plate to the working surface of the part. As the plate approaches, the voltage should drop to 0.4 volts.

If during diagnostics it turns out that the DPRV has failed, it must be replaced with a new sensor. Otherwise, you should pay attention to the integrity of the electrical wiring. If necessary, clean the connector pads from oxidation.

Product replacement

The car owner can replace the phase sensor himself. This does not require the use of specialized equipment. The work is carried out in the following sequence:

Disconnect the on-board power supply by removing the negative terminal from the battery.
Disconnect the electrical wiring plug.
Unscrew the fastening element.
Remove the sensor from its seat.
Install the new product in reverse order.

So, in this article we have listed the main symptoms of a faulty phase sensor on a VAZ 2114, talked about how you can check this sensor, and also described the process of replacing it. If you have any questions, be sure to ask them in the comments. We will try to help you help!

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conclusions

Checking the camshaft position sensor of the VAZ-2114 is quite easy and simple. Almost every motorist can cope with this task. But, it is still recommended to start diagnostic operations by connecting to the ECU and identifying error codes.

The VAZ 2114 car is equipped with a phase sensor. It is necessary to determine the position of the camshaft in relation to the parts of the crank mechanism. Symptoms of a malfunction of the phase sensor on a VAZ 2114 8 valves may differ individually for each case, and in this article we will consider all possible manifestations of this malfunction.

Checking the camshaft sensor

Checking the camshaft sensor (DPRV) allows you not only to verify its functionality, but also to make sure that in engines with phased (sequential) injection, fuel is supplied in exactly the required sequence. Another name for the device is a phase sensor (it is often used by owners of domestic VAZs). The test can be performed using a multimeter in voltmeter mode and/or an oscilloscope. Checking the camshaft position sensor is simple in nature, and even a novice car enthusiast can handle it.

What is a camshaft sensor

Before moving on to the question of checking the camshaft position sensor, you need to find out what kind of device it is, what it is needed for and on what principle it works. This will help clarify the details of the audit in the future.

A camshaft sensor is a device that records the angular position of a specified shaft at a specific point in time. The information obtained with its help is transmitted to the electronic engine control unit (ECU), and on its basis this control element issues commands for fuel injection and ignition of the air-fuel mixture in each cylinder at a specific point in time.

The operation of the camshaft position sensor is based on the Hall effect. So, directly on the camshaft there is a metal tooth, which, when the shaft rotates, changes the magnetic field in a nearby sensor. This tooth is called rapper. The sensor detects a change in the magnetic field, which is converted into a low voltage electrical signal. This signal is sent to the electronic control unit.

In fact, the camshaft position sensor only registers one position, corresponding to the position of the piston of the first cylinder at top dead center. Next, phased fuel injection is performed in the firing sequence of the cylinders. Typically this is a 1-3-4-2 system.

If the camshaft sensor fails (the electronic control unit receives incorrect information from it or does not receive it at all), then it is programmed to switch to emergency mode. It involves the use of pairwise-parallel (group) fuel supply to the engine. This leads to two negative consequences:

A slight loss of engine power, especially when driving in critical modes (acceleration, driving under load).
Increase in fuel consumption by approximately 10...20% (depending on engine power, its design features, as well as operating conditions).

As for diesel engines, camshaft position sensors are designed similarly, but there is one difference. It lies in the fact that the sensor records the position of not only the first cylinder, but all of them. This is done due to the fact that the drive disk has a separate tooth for each cylinder.

Thus, if a sensor fails, it makes sense to diagnose it as quickly as possible and, if necessary, replace it.

Signs of DPRV failure

There are several typical signs that indicate that the camshaft position sensor has failed. It is immediately necessary to clarify that the symptoms listed below may indicate completely different malfunctions. Therefore, it makes sense to perform additional diagnostics. So, signs of a DPRV breakdown:

Problems with starting the engine, under any conditions - “cold”, “hot” and in other modes. This usually results in having to crank the starter longer.
Unstable engine operation, “floating” operating and idle engine speeds.
“Dips” in the movement of the car; when you press the accelerator pedal, it does not respond immediately, the dynamic characteristics of the car are lost (it accelerates poorly, does not pull, especially when loaded and when moving uphill).
When the accelerator pedal is released, the engine stalls.
Increased fuel consumption (by 10...20%).
The Check Engine warning light on the instrument panel activates. It is necessary to perform additional diagnostics using an electronic scanner (for example, an ELM 327 device or its equivalent). In this case, typical errors regarding the operation of the sensor are numbers P0340, P0342, P0343.

In fact, the camshaft position sensor is a fairly simple and reliable device, so it rarely fails. More often, its wiring is damaged - the wires fray, the insulation on them is damaged, the so-called “chip”, the place where the sensor is connected to the car circuit, fails.

However, for cars that run on gasoline, the problems described above are not so clearly expressed. But a failed camshaft position sensor will cause many problems for owners of cars equipped with gas equipment, in particular the fourth generation. The malfunctions and problems described above can appear on such machines “in all their glory.” Therefore, owners of cars equipped with HBO are strongly recommended to diagnose and replace the sensor as quickly as possible if it is suspected of being faulty.

Replacement on 8-valve engines

The procedure looks like this:

Find the location of the device: at the top of the engine, to the right of the air filter housing.
The camshaft sensor is secured with one bolt. Unscrew it with a 10mm wrench.
Extract the DF.
Stick a clean rag into the hole under the sensor to prevent dust and dirt from getting in.
Carry out a visual inspection of the device.
If there is a large amount of dirt on the surface of the sensor, remove it. Try to test it in operation by installing it in place. If this does not help, the sensor will need to be replaced.
If even installing a new device has no effect, and the error still occurs, then the reason lies in the fact that the gear has shifted on the camshaft. And a new similar part is needed, and not a camshaft sensor (VAZ-2114). Its price, by the way, is about 300 rubles.
If the error appeared after replacing (breaking) the timing belt, then most likely it was shifted by several teeth during installation. Disassemble the timing belt compartment and check the marks.

Location of the DPRV on the engine

To check the camshaft position sensor, you need to know where it is located. As a rule, on eight-valve engines the DPRV is usually mounted at the end of the cylinder head. On sixteen-valve engines it is also mounted on the cylinder head, usually in close proximity to the first cylinder.

As for popular domestic VAZ cars, their owners call such units phase sensors. Their location in these motors is similar. So, on eight-valve engines, the sensor is located on the left side of the cylinder head (when viewed in the direction of travel of the car). On sixteen-valve engines - on the right front part of the engine. In the latter case, the sensor is not directly visible visually; its location can only be assessed by the signal and power wires suitable for it. The VAZ 2114 phase sensor is fixed in close proximity to the air filter, near the cylinder head.

Location and purpose

To detect the phase sensor, you do not need to take complex acrobatic positions, it is not difficult to get to it, it is located where the camshaft is located, on the right side of the engine compartment near the air filter. Moreover, it doesn’t matter at all whether there are 8 valves or 16 in your “iron horse”, the registration address “DPRV” remains unchanged. So how does this small, seemingly useless mechanism work? Having learned its specialization, doubts about its effectiveness will disappear on their own.

So, the phase sensor, with the assistance of a special gear, reads information from the camshaft, and then sends it to the electronic engine control unit. The latter, based on the data received, adjusts the ignition angle. That is, dear friends, we happy owners of the “fourteenth model” do not need to constantly adjust the trampler, as happens on carburetor cars, everything is automatic here. What can we say, the 21st century is truly a time for new technologies. It is thanks to this process that it is possible to significantly reduce fuel consumption, and even increase the power level of the power unit. Just imagine how much a fuel-injected car would eat without DPRV?

Methods for checking the camshaft sensor

Before testing the sensor using a multimeter or other electronic tools, you must check its mechanical integrity. In particular, it is installed in a housing with an O-ring, ensuring its secure fastening. We need to check its condition. It would also be useful to check the integrity of the sensor body, whether there are cracks or other damage on it. It is advisable to check the drive disk to see if the teeth are damaged or if there are metal shavings on the sensor body or nearby.

On the Internet you can find information that supposedly the DPRV can be determined to work by simply checking its magnetic properties. In particular, bring a small metal part to its end (the working sensitive part), which should “stick” to the sensor. In fact, this is not the case , and a non-working DPRV may or may not have magnetic properties. Accordingly, verification must be performed using other methods.

There are two main ways to test the camshaft position sensor - using an electronic multimeter and using an oscilloscope. The first method is simpler and faster, but the second is more accurate and provides more diagnostic information.

Checking the camshaft sensor with a multimeter

To check the DPRV, dismantling is necessary. This is not difficult to do; you just need to disconnect the contact group of wires from it and unscrew the fastening bolt. You will also need a small metal object (ferrous metal so that it is magnetic) to test.

Connection diagram for checking phase sensor 21110-3706040

Connection diagram for checking phase sensor 21120-3706040

The algorithm for checking the sensor with a multimeter is as follows:

Take a multimeter and switch it to the DC voltage measurement mode in the range up to 20 V (depending on the specific multimeter model).
Disconnect the “chip” from the sensor by unclipping the latch.
Remove the sensor from its mounting location.
On the “chip” of the sensor 21110-3706040 of a VAZ car (and on many others), contact “A” corresponds to ground, contact “C” is the positive wire, comes from the control relay, contact “B” is the signal wire (middle). For sensor chip 21120-3706040, contact “A” corresponds to ground, contact “B” is the positive wire from the control relay, contact “C” is the signal wire.
Check the presence of power on the chips. To do this, you need to turn on the ignition on the car (but do not start the engine) and do this with a multimeter. If there is no power to the chips, then you need to look for the reason. This could be faulty wiring (insulation damage, broken wires), failure of the control relay, or a glitch in the electronic control system (ECU).
Next, you need to connect the sensors for testing according to the diagrams shown in the figure.
Apply a voltage of 13.5±0.5V to the sensor (although less is allowed, for example, 12...12.5 Volts from the battery).
If, when power is applied to the sensor, the voltmeter detects a lack of voltage on the sensor, then this indicates either a breakdown of the sensor itself, the test can be completed and you can prepare to replace the sensor with a new one.
Measure the voltage between the positive and signal contacts. It must be equal to at least 90% of the supply voltage (that is, if the supply voltage is 12 Volts, then the voltage at the signal contact must be at least 10.8 Volts).
Bring a metal object prepared in advance to the end of the sensor (its signal part). Re-measure the voltage at the signal contact. It should be no more than 0.4 Volts. Remove the plate - the voltage value should be restored to 90.100% of the supply. If there are any deviations during the verification process, it means that the sensor has failed and must be replaced.

Checking the DPRV using an oscilloscope

An electronic oscilloscope helps to understand how the camshaft position sensor works and whether it produces pulses at all. Usually they use a so-called electronic oscilloscope, that is, simply a simulator program installed on a laptop or other similar device. You need to connect to the camshaft sensor and take an oscillogram from it. Ideally, there should be a smooth comb diagram with one drop-out peak that corresponds to the rapper passing through the sensor. If the oscillogram has a different shape, additional verification is needed.

When diagnosing the camshaft sensor of Nissan cars (in particular, Nissan Almera) with an oscilloscope, the shape of the oscillogram will be different. It will not be smooth, but in the form of 3 impulses, then a space, then 4 impulses - a space, 2 impulses - a space and one impulse - a space. For engines from this automaker, this feature is the norm.

Replacing the RV position sensor

If during the inspection it turns out that the camshaft position sensor itself has failed, then it must be replaced. As a rule, these units are non-repairable, since their body is sealed and cannot be disassembled. The sensor is inexpensive, and the replacement procedure is simple, and even a novice car enthusiast can handle it.

The sensor replacement algorithm is as follows:

With the engine not running, disconnect the negative terminal from the battery.
Disconnect the “chip” from the camshaft position sensor (as when checking).
Depending on the vehicle model, it is necessary to remove parts that prevent access to the sensor. For example, on modern cars like the Lada Vesta, it is necessary to remove the bracket for auxiliary units.
Using a wrench, unscrew one or two mounting bolts, depending on the type of fastening. The size of the wrench can be different, usually for VAZs it is a 10 mm wrench.
After dismantling the mount, you must similarly remove the sensor from its seat.
Installing a new sensor is performed in reverse order.
Connect the negative terminal to the battery.

When purchasing a new camshaft position sensor, you need to pay attention to the condition of its O-ring. It is usually sold separately. When changing the sensor, it is advisable to also change the O-ring, since over time it wears out and loses its elasticity. You can use an old ring only in case of emergency, when it is not possible to buy a new one.

Conclusion

The camshaft position sensor is a simple but important device in the engine, and the normal functioning of the engine depends on its operation. Therefore, when identifying signs of its failure, it is advisable to carry out the appropriate diagnostic procedures as quickly as possible. They are simple, and even a novice car owner with no experience can handle them. The same goes for replacing it. The price of a phase sensor for VAZ cars as of winter 2019 is about 400 rubles.

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