On VAZ-2110 equipped with engines with an injection power system, the crankshaft speed of the power plant at idle is maintained by the XX (IAC) regulator.
The task of this element is to stabilize and maintain crankshaft speed at a given level under different conditions - abruptly releasing the gas pedal, creating a significant load on the on-board network (when the heater, headlights, etc. are turned on). A malfunction of the VAZ-2110 idle speed control does not affect the performance of the engine, but the lack of idle speed causes a number of inconveniences when operating the car.
General concepts
One of the most common troubles that prevents you from fully driving a car is the idle speed sensor of the VAZ 2110 and modifications.
Although this device is called a sensor among drivers, it will still be correctly called the idle speed controller, abbreviated as IAC, because all automobile sensors are measuring equipment, and this product serves to automatically stabilize and maintain idle speed by supplying air to the engine VAZ 2110 with the throttle valve fully closed. IAC is an important component of the engine and plays a significant role in the stable and uninterrupted operation of any VAZ vehicle.
Idle speed control
The VAZ 2110 idle speed sensor (abbreviated DXX) is an actuator, simply a valve consisting of an electric motor, a spring, and a rod on which a shut-off needle is installed (you can see it in the photo). It is through which the volume of air is dosed. That is, when the throttle of a VAZ 2110, 2112 is completely closed, and the controller determines that the idle speed needs to be increased, the IAC generates a command to change the position of the needle. It moves, partially or completely opening the intake port, through which air bypasses the throttle and then mixes with fuel. As a result, the engine does not stall.
A little theory
A sensor is an element that belongs to the category of measuring instruments. Basically, such a node is used to analyze, process and convert incoming information with subsequent output to a display board.
Among car owners, the idle speed sensor is called the abbreviation IAC. This is one of the most important parts in the internal combustion engine, which is responsible for the stable operation of the vehicle.
This regulator is an actuator, and it is not easy to identify problems with its operation. All this is due to the fact that VAZ cars do not have self-diagnosis. For example, if the IAC breaks down, the “check engine” error will not appear.
Signs of IAC malfunction
Unfortunately, the 2110 VAZ DXX is not equipped with a self-diagnosis system, so the “CHECK ENGINE” light signal will not indicate a malfunction. Loss of performance on the VAZ 2110, 2112 is determined by the following main features:
- the engine “stalls”, for no apparent reason, at idle;
- idle speed “floats”;
- when a “cold” VAZ 2110, 2112 engine is started, there is no increased speed at all;
- The engine stalls, namely, after turning off the gear while driving.
The symptoms completely coincide with the failure of the VAZ 2110 TPS, but in the case of this sensor the “CHECK ENGINE” indicator will light up.
Idle speed regulator VAZ-2110
On VAZ-2110 equipped with engines with an injection power system, the crankshaft speed of the power plant at idle is maintained by the XX (IAC) regulator.
The task of this element is to stabilize and maintain crankshaft speed at a given level under different conditions - abruptly releasing the gas pedal, creating a significant load on the on-board network (when the heater, headlights, etc. are turned on). A malfunction of the VAZ-2110 idle speed control does not affect the performance of the engine, but the lack of idle speed causes a number of inconveniences when operating the car.
How to remove IAC
If signs of malfunction characteristic of the IAC are detected, then it will need to be removed (first for inspection). On the VAZ 2110, this sensor, which is small in size (easily fits in the palm of your hand), is located in a seat on the throttle body (can be seen in the photo).
Removing the idle air control
If necessary, its dismantling is quite easy - it is secured with only two screws. In extremely rare cases, it is necessary to remove the entire VAZ 2110 throttle assembly.
Dismantling is carried out in the following sequence:
- The VAZ 2110 is placed on the handbrake;
- The negative terminal of the battery is disconnected;
- The wiring harness connected to the IAC is disconnected;
- Be sure to clean the connection between the sensor and the throttle body to prevent dirt and rust from getting into the hole;
- Unscrew the fastening screws holding the idle speed sensor of the VAZ 2110.
Choosing a replacement regulator
On the VAZ-2110 with both 8-valve and 16-valve injection engines, a sensor with catalog number 2112-1148300 is used. Additionally, at the end of the marking there is a prefix consisting of two numbers, for example, 01, 02, 03, 04. This index indicates the manufacturer of the regulator (01 and 03 - “Pegasus”, 02 and 04 - KZTA). When choosing a replacement regulator, pay attention to two nuances - the seal and the height of the needle protrusion above the body. Factory spare parts use a red seal, while counterfeits use a black rubber element. The height of the needle protrusion above the body is 23 mm.
Before installing a new regulator, it is recommended to coat the sealing ring with a thin layer of engine oil to ensure a tight fit of the part in the seat and eliminate the possibility of air leaks.
Video: Review of VAZ idle speed controllers
Source
How to check the sensor?
If you have a tester, checking is easy:
- Set the VAZ 2110 to the handbrake;
- Disconnect the IAC connector to check;
- Check the voltage of the VAZ 2110, 2112 sensor circuit, while connecting the “minus” to the engine, the “plus” to the removed block, namely to terminals A: D (marked on the block, you can see the diagrams);
- The ignition is turned on and the readings given by the idle speed regulator are checked, which should be about 12 V. The value will be less - most likely the battery is discharged. When there is no voltage, it is necessary to check the entire circuit, and then the electronic control unit. There are no malfunctions, which means the circuit is working - the IAC installed on VAZ 2112 engines and other modifications are checked;
- The tester terminals are connected to the block, the circuit is as follows - first to terminals A: B, then to C: D. The resistance should be within 53 Ohms;
- Next, pairs A: C, B: D are checked - in this case, the resistance on a working product will be infinitely large.
IAC diagram
When, as a result of these checks, the sensor reveals a discrepancy in the readings, it should be replaced. Also, the inoperative state of these VAZ 2110, 2112 engine sensors, in the unscrewed position, can be checked by attaching a block to them, then you need to turn on the ignition.
Thanks for subscribing!
When the power is connected to the working product, the rod with the needle will change position. No changes will occur on a broken sensor. If a breakdown of the idle air regulator is detected, of course, it must be repaired. But there is no need to rush to a car service center - you can do the repairs yourself, saving money and time. But first, in general, it is worth cleaning the IACs; often after this they return to “life”.
Causes of failure. Node check
The reasons for the malfunction of the XX regulator are breaks in the electrical winding. engine and needle jamming due to dirt or corrosion. But the sensor is not always the “culprit” for missing idle speed. Therefore, before removing and checking the sensor, check its power supply circuit.
For all checks you will need a multimeter. The power circuit is checked with a device set to “voltmeter” mode. Diagnostics is simple - we disconnect the block with wires from the regulator, connect the “negative” probe of the multimeter to ground, and the positive one to the terminals marked with the letters “A” and “D”. With the ignition on, we take measurements. If the circuit is working properly, the readings should correspond to the rated voltage of the circuit. If there is no voltage, you should check the computer and relays responsible for powering the sensor.
IAC cleaning
It is recommended to wash and clean any non-working idle speed sensor on the VAZ 2110 to make sure it is faulty. The process is very simple and will not take much time. To do the job you need: carburetor cleaner, WD-40. The following actions are performed:
- The block is removed from the sensor;
- Apply any of the listed cleaning liquids to a regular cotton swab and carefully treat the contacts;
- Unscrew the screws securing the idle speed sensor;
- Remove the IAC from the seat;
- Inspect the idle speed sensor. If black dirt, oil, or IAC are detected, it is necessary to clean the entire throttle assembly. If not, spray WD-40 or cleaner onto the needle with a spring, thereby cleaning it. Dry the idle speed sensor VAZ 2110, 2112;
- Before reinstalling, measure the distance between the idle speed sensor housing and its needle, which on a working regulator is 23 mm.
When the IAC VAZ of the tenth family did not work normally, the guide needles wore out and the wire inside the housing broke. In these cases, the idle air regulator must be replaced.
On a VAZ 2110, the idle speed sensor is mounted in the reverse order of dismantling.
Differences between a fake and an original
Unfortunately, today you can find a lot of counterfeit products on the automobile market. You can distinguish an original from a fake by a number of criteria.
Counterfeit has the following characteristic features:
- the black metal case is exactly 1 mm shorter;
- There are three white rivets on the body. They don't have hats. Unlike counterfeits, the original has them;
- the counterfeit has a white spring, while the original has a black spring;
- the color of the regulator ring on the fake is black, but in the original it has a reddish tint;
- the counterfeit tip has darker shades compared to the original;
- fakes and originals have external differences in the design of the boxes;
- in the original the yellow sticker is framed. Whoever is counterfeiting this part has overlooked this.
If you are extremely careful, recognizing a fake is not difficult.
Preventive measures
In order not to encounter a complete malfunction of the regulator in the future, it is worth periodically carrying out the cleaning process described above. How often to carry out the cleaning process depends on how actively you use your vehicle. If the car is a work vehicle, it is recommended to check and clean the sensor once a year; if you use it only for yourself, once every two years will be enough. But, of course, do not forget about the signs of a part malfunction; if they appear, do not delay. This will help you avoid complete failure of the part and enjoy a high-quality ride. Together with you, we come to the conclusion that the part is unpretentious, simple in its functionality and use. Don’t forget: timely detection of a malfunction is the key to overall vehicle productivity. The full operation of the engine depends on the serviceability of each of its components, and if you neglect any part, including the idle speed sensor, this can lead to more labor-intensive repair processes and failure of the entire car.
Checking the idle speed sensor
Diagnosing the part is quite easy, but pay attention to a few points. The first problem may be removing the part; most manufacturers attach the XX sensor to screws, and in extreme cases they can be drilled out, but in some variations the part is mounted on varnish
If your regulator is secured with varnish, be careful not to forcefully remove it, as this may damage the intake part of the car. In your case, it would be correct to completely dismantle the throttle assembly and only then disconnect the IAC.
The easiest way to check is, of course, visual inspection.
During a visual inspection, the first thing you should pay attention to is whether the needle is dirty. Also pay attention to the condition of the contacts and the throttle valve itself.
If broken wires are found, they must be returned to their place. Solder them and, to avoid corrosion, treat them with varnish.
It would be appropriate, if possible, to check the IAC with a multimeter or a homemade tester. You can check the resistance with a multimeter, and use a homemade tester (you can make one from a mobile phone charger) to check the stroke of the regulator rod.
If you find that the motor is damaged, the rod is completely worn out, or the cone needle is worn out, the part will need to be replaced. Don’t be too upset about this, the cost of the part will only be about 1000 rubles.
