Phase sensor for VAZ 2114 8/16 valves - how to check, replacement

Hello, dear pelvic producers! The “Check” signal came on back in July, unexpectedly as always, during a trip to Arkaim.

The Check Engine signal is a harbinger of troubles and unexpected expenses.

The on-board computer interpreted error P0343 as “high signal level of the phase sensor.” Since there was no service station or auto shop expected within a radius of 100 km, I decided to drive with a malfunction. Moreover, the engine started easily and ran smoothly. After 50...60 kilometers the “Check” went out and I was glad that the fault had resolved itself.

However, everything turned out to be completely different. “The check began to light up more and more often, and recently it went out only after resetting the fault code through the BC. But the next time he started, he again began to wink with his red eye. It is typical that I did not notice any changes in engine performance, and fuel consumption, according to the BC readings, even decreased slightly.

It is clear that if the phase sensor fails, instead of distributed injection in each cylinder, a distributed pair is switched on for cylinders 1-4 and 2-3. But, according to theory, the engine should start after about 10 crankshaft revolutions, and fuel consumption should increase. This question tormented me for a long time, but in the end “Check” got to me and I realized that sooner or later the sensor would have to be replaced.

The phase sensor on the engine is secured with a bolt with an x10 head. Replacing it is not difficult. You just need to remember about the rubber sealing ring that may remain in the sensor hole. It needs to be removed, put on the sensor body and lubricated with a drop of engine oil.

In the store, the salesman grinned and asked: “Which sensor do you want, a good one or an ordinary one?” A good sensor cost 430 rubles, and a regular one - 320. I chose a good one.

Find 10 differences. New sensor on the right, used. - left

After installing it and resetting the error, the “Check” no longer came on. This is all reasonable and does not contradict common sense. I was confused by the following: while experimenting with the sensor, I removed the connector from it and started the engine, expecting error P0342 “Low level of phase sensor signal.” However, the “Check” did not light up, the engine started at half a turn and worked as if nothing had happened?! So, maybe there was no need to change the sensor? Reset the connector and ride to your health? Maybe someone has encountered such a situation?

In conclusion, I decided to disassemble the sensor and see what was inside, since I couldn’t find any intelligible information on the Internet (maybe I didn’t look well?). After cutting the case inside, in a loose compound, I found a small signal conditioner board and a Hall sensor consisting of a transistor, a magnet and a tuning screw core.

Inside the case there is a signal conditioner board with two diodes, resistors and capacitors, as well as a Hall sensor with three transistor legs

Actually, the Hall sensor: transistor, magnet and steel trimming core

There are few parts, nothing seems to break. It seems to me that the fault was poor contact between the legs of the transistor and the board tracks, which were simply pressed against each other (if you look closely, traces of contact can be seen in the picture). Now, if they were connected by soldering, the reliability of the unit would be much higher. I hope that this is exactly what makes a “good” sensor different from a regular one.

Checking and replacing the VAZ 2114 phase sensor: step-by-step instructions

The VAZ 2114 camshaft sensor is one of the most important measuring instruments of the fourteenth, which, through a pulse signal, transmits information about the current engine operating cycle to the car’s brains. Based on the information received, the electronics adjusts the timing of supply and ignition of the fuel mixture in the engine cylinders.

A normally functioning DF is the key to the correct functioning of the engine, which achieves the optimal ratio of the amount of fuel consumed and the operating power of the power unit.

From this article you will learn the main causes of DF malfunction and how the failure of the device affects the operation of the car. The technology for replacing the DF on the VAZ 2114 will also be examined in detail.

Features of the VAZ 2114 phase sensor

Determination of DF failure

If it breaks down, minor problems arise with idle stability; when starting to move, a “tweaking” effect is possible, as well as increased fuel consumption. These symptoms are associated with the failure to receive on-board computer data on the ignition angle at a certain point in engine operation. If there is no signal from the sensor, the control unit enters emergency mode, that is, it begins to work on a predetermined program without a sensor and issues an emergency error “0340” or “0343”.

Causes and symptoms of malfunction

You can determine that the phase sensor on a VAZ 2114 has failed by the following malfunctions in the vehicle:

• Gasoline consumption has increased significantly;
• The acceleration dynamics of the fourteenth have worsened, and dips are observed in the engine’s idle speed;
• The engine idles;
• Errors No. 0343 and 0340 are displayed on the on-board computer screen, which indicate that the DF is faulty and the ECU is operating in emergency mode.

The reason why the phase sensor failed can be determined only after dismantling and visual inspection of the device, in some cases - after diagnosing it. As a rule, the main causes of DF failure are as follows:

• A short circuit has occurred on the internal DF circuit;
• Mechanical damage to the device mounting ears, due to which the housing has shifted in the mounting socket;
• The toothed disk on the pulse signal converter has broken;
• The DF was damaged due to the increased temperature of the engine.

Phase sensor

If the device breaks down, the ECU starts working solely on the readings of the crankshaft sensor. In this mode of operation, it is impossible to carry out phased fuel injection, as a result of which the brains of the fourteenth switch the engine to twin injection, which results in excessive consumption of gasoline and deterioration in acceleration dynamics.

Repairing the device in most cases is not advisable, since a DF that has once failed is unlikely to work normally in the future.

Fortunately, the cost of DF is low - the price of a new device is 400-600 rubles, depending on the manufacturer (prices are also relevant for sensors on the VAZ 2115).

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!

Source

Checking the functionality of the phase sensor

If typical signs of DF failure occur, or if errors 0343 or 0340 are displayed on the on-board computer of the fourteenth, it is necessary to check the functionality of the DF. This is done using a conventional multimeter.

Fourteeners with 16 and 8 valve engines have different DFs, so the specifics of checking them will be slightly different.

How to check the camshaft sensor VAZ 2114 8v:

1. On the first probe of the tester we set the voltage to 13.5 Volts and connect it to contact “E” on the DF, on the second probe, which must be connected to contact “B” - 0.9 V;
2. Having closed the contacts, we bring a metal screwdriver to the end of the sensor. If the DF is working properly, you will see on the tester screen that the voltage of contact “B” has dropped to 0.4 Volts. If this does not happen, the DF is broken;

How to check the camshaft sensor VAZ 2114 16v:

1. We set the following voltage on the multimeter: contact “E” – 13.5 Volts, “B” – 0.4 Volts;
2. We close the contacts and insert a screwdriver into the hole on the phase sensor. If the device is working properly, the voltage at pin “B” will increase to 0.9 Volts.

A multimeter is a standard device for checking the performance of any sensor

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

Replacing the phase sensor VAZ 2114 8 valves

Having determined that the DF is faulty, you can begin to replace it. The process is easy enough that you will only need a ratchet wrench with a 10 mm head to do all the work yourself.

First, let's figure out where the VAZ 2114 phase sensor is located. It is located on the right side of the engine compartment, near the air filter. It is secured to the cylinder block body with one screw.

Replacement of the VAZ 2114 phase sensor is carried out in the following sequence:

1. Open the hood and disconnect the power terminals from the fourteenth battery;
2. Disconnect the wire block from the DF;
3. Using a 10mm wrench, unscrew the screw fixing the sensor on the cylinder block;
4. We remove the DF from the mounting socket.

After dismantling the old device, inspect it visually; perhaps the cause of its malfunction is metal dust magnetized on the DF body. If found, wipe the device with a cloth and reinstall it. If it does not come to life and the on-board computer continues to generate errors, the sensor needs to be replaced.

The new camshaft position sensor of the VAZ 2114 is installed in a similar way. As you can see, the work here only takes 10-15 minutes (replacing the VAZ 2115 phase sensor is carried out using the same method).

Important: when installing the DF into the mounting socket to seal the fixation, it is prohibited to use any sealing agents, since the device is located in an environment with a constantly changing temperature regime, in which the sealant will simply melt and bring you a bunch of additional troubles with the engine.

There are often cases when, even after installing a new DF, errors 0350 or 0343 continue to be displayed on the on-board computer of the fourteenth.

There are two possible scenarios for the development of events. You may have come across a faulty DF (even salespeople in auto stores say that if for 10 domestically produced phase sensors there are 5 workers, without manufacturing defects, this is already good).

Checking the functionality after replacement is carried out using a multimeter, as described in the previous section of the article. If the tester data corresponds to the indicators of a fully working sensor, then the problem is not with it. Errors 0350 and 0343, indicating a faulty DF, can also occur due to a timing belt that is stretched or has slipped by 1-2 teeth, or a loose crankshaft gear.

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:

1. 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).
2. Disconnect the “chip” from the sensor by unclipping the latch.
3. Remove the sensor from its mounting location.
4. 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.
5. 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).
6. Next, you need to connect the sensors for testing according to the diagrams shown in the figure.
7. Apply a voltage of 13.5±0.5V to the sensor (although less is allowed, for example, 12...12.5 Volts from the battery).
8. 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.
9. 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).
10. 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.

Injection engine operation

The normal operation of an internal combustion engine is due to the coordinated action of all components. The fuel combustion process is controlled by an electronic unit. The following systems are used that are responsible for the operation of the injection engine 2115, 2114 models:

• air preparation;
• fuel supply;
• electronic engine control system (ECM);
• ignition;
• gas distribution;
• exhaust;
• cooling;
• engine oil system.

The ECM system for a Priora or VAZ 2115 car is controlled by an electronic control unit (ECU). Stable operation of the unit largely depends on the condition of the sensors. The ECU processes information received from various sources. Based on the analysis, a command is issued to open the injectors.

The camshaft position sensor tells the processor the actual position of the pistons at that moment. The operating principle is based on the Hall effect. When the gear teeth approach the device, an electrical signal appears at the output. In Priora and other cars, the gear is installed on the valve control shaft. It is set on a dowel. One tooth is missing on the camshaft gear.

The depression is placed opposite the sensor. The mark must not be moved. Such positions of the distribution mechanism correspond to the extension of the piston of the first cylinder to top dead center.

When the position of the VAZ 2114 camshaft changes, an alternating magnetic field appears. The sensitive element generates a pulse signal. The ECU counts the number of pulses and issues the necessary commands.

What is he like?

The phase sensor operates on the principle of an elementary Hall sensor. Installed only in the camshaft area on both 8 and 16 valve engines. The device reads data from the engine camshaft using a gear mounted on the shaft with two missing teeth. These two teeth are positioned so that every time the device is hit, the first piston of the engine is at top or bottom dead center. Information signals about the location of the camshaft are sent to the engine control unit, which, in turn, monitors and changes the ignition angle. It began to be used at VAZ factories on the first cars with distributed fuel injection.

It is worth noting that carburetor engines do not have this unit, because their ignition timing system is vacuum-mechanical.

The main function of the camshaft position DF or phase sensor is to constantly adjust the ignition angle while the engine is running. Thanks to its use, VAZ family engines began to transmit power more efficiently with reduced fuel consumption. The main indispensable use of the phase sensor remains for two camshaft, 16-valve engines, which without it cannot operate evenly and economically according to the folded factory design.

Signs of device failure

A faulty phase sensor will result in signal disruption. The ECM polls the DF for 4-5 minutes. If the signal does not appear within the specified period, the unit switches to double fuel injection mode.

If the phase indicator fails, the controller queries only the crankshaft position sensor. In this case, gasoline is supplied simultaneously to two cylinders. At the same time, fuel consumption increases by approximately 10%.

Failure of the phase sensor leads to a number of other troubles. Repairs need to be made. Signs of engine trouble:

1. Increased gasoline consumption.
2. Vehicle diagnostic failures.
3. Violation of acceleration dynamics of VAZ 2115.
4. Difficult start. The engine starts after 4-5 seconds.
5. After starting, the Check Engine light comes on.
6. Error P0343 or 0340 appears during diagnostics.

Before inspecting the sensor, you should make sure that the remaining parts are in good condition. Failures will occur due to a broken timing belt, loose camshaft gear, or incorrect installation of marks.

Often sensor error 0343 is associated with oxidation of contacts or broken wires. Before discarding the phase indicator, make sure the wiring is intact. Resistance measurements in the circuit are carried out with a multimeter.

It is difficult to determine the malfunction of the phase sensor yourself. It is better to carry out diagnostics at a service station. The sensor is checked on a computer.

If the auto mechanic makes a disappointing diagnosis, then we go to the store. You should know that you can run into low-quality spare parts or fakes. Experts advise purchasing sensors from Bosch or the Kaluga plant.

The phase sensors for 8- and 16-valve engines are different. Therefore, when purchasing, tell the seller your engine type. The best option would be to go to the car market with your original. If after replacement the sensor error occurs again, return it.

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.