VAZ-2112 How to check IAC: signs of malfunction

On a VAZ-2110 with an injector, the crankshaft speed of the power plant at idle is maintained by the XX (IAC) regulator. The task of this regulator 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 are turned on, etc.). 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.

What is an idle speed regulator (sensor)

The product in question is called both a sensor and a regulator (more correctly), and also less commonly a valve. Abbreviated as DXX, RXX. On the VAZ 2110, the idle speed sensor, like on the 2112, is installed with N according to catalog 2112-1148300.

The cost of the IAC is about 400–600 rubles, it is supplied to Prioras, Kalinas, Tavrias, Lanos and Sensas - checks and maintenance of the parts are similar.

You can change the idle speed sensor on a VAZ 2112 by unscrewing the two retaining screws. The valves are always located as standard on the rear of the intake manifold.

The idle speed sensor on the VAZ 2110 is a small valve assembly for measuring and actuating direction. However, despite its small size, if the regulator is faulty, serious disturbances in the functioning of the internal combustion engine are observed: more fuel is consumed, power decreases.

The best idle speed controller VAZ 2110-12

Purpose of IAC:

• IAC is a stepper motor with a spring-loaded conical needle. It serves to maintain the set engine speed at idle, and this happens by changing the amount of air supplied to the engine when the throttle is closed.
• At idle, the engine receives the amount of air necessary for its stable operation. This happens by changing the flow area of ​​the additional air supply channel, bypassing the closed throttle valve.

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Photo source.

Where can I buy IAC and what is the approximate price: Approximate cost from 400 rubles. You can buy it in online stores (section “Spare parts”)

How IAC works, tasks

Functions, operating algorithm of idle air valves:

1. The functional task is the dosage of air supply. When the intake damper is fully open, and the electronics (ECU) detects the need to force idle speed, the IAC changes the location of its valve in the inlet opening in the shape of a thick needle or a long cone.
2. This way the volume of incoming air is regulated. Moving, the rod creates the desired gap.
3. A path with the required width is created for the air to bypass the throttle and then mix with the fuel.
4. The result is that the engine does not stall.

In more detail, the work of the IAC looks like this. If the engine starts in cold weather, the ECU activates the valve to open the intake port, simultaneously supplying a larger volume of fuel for combustion. The revolutions increase, the heating of the internal combustion engine is accelerated. When the operating t° for the auto power plant is reached, the IAC stepper motor moves the closing cone forward. The air flow is reduced, the intensity of the stroke drops.

The VAZ 2112 idle speed sensor stabilizes it and levels it out, preventing jamming by dosing air when the intake valve is closed.

Diagnostics and replacement of rcx and dpdz

I hope the information from this post will be useful and will be useful to someone! Good luck on the roads and a full tank!

The “symptoms” of a faulty throttle position sensor include the following:

1. Increased idle speed. 2. The engine stalls in neutral gear. 3. Idle speed floats. 4. Jerks during acceleration. 5. Deterioration in dynamics. 6. In some cases, the Check Engine light may come on.

Diagnosis of the throttle position sensor is carried out as follows:

1. Turn on the ignition, then check the voltage between the slider contact and the minus with a voltmeter. The voltmeter should show no more than 0.7 V. 2. Next, turn the plastic sector, thereby fully opening the damper, then measure the voltage again. The device should show at least 4 V. 3. Now turn off the ignition completely and pull out the connector. Check the resistance between the slider contact and any terminal. 4. Slowly, turning the sector, monitor the voltmeter readings. Make sure that the needle moves smoothly and slowly; if you notice jumps, the throttle position sensor is faulty and must be replaced.

Replacing the throttle position sensor:

1. Disconnect the wire from the “–” terminal of the battery. 2. Disconnect the block with wires from the throttle position sensor by pressing the plastic latch. 3. Unscrew the two mounting screws and remove the throttle position sensor from the throttle pipe. 4. Install the new sensor in the reverse order, but do not forget about the foam ring. The throttle position sensor does not require any adjustment, since the controller perceives idle speed (i.e. the throttle valve is completely closed) as the zero mark.

The “symptoms” of a faulty idle speed sensor include the following:

1. Spontaneous unregulated change in engine speed (sudden decrease or increase). 2. When turning on a “cold” engine, there is no increase in speed. 3. When using additional vehicle devices (heater, headlights), the idle speed is simultaneously reduced. 4. The engine stalls at idle and when shifting gears. It is necessary to remember that the readings of the VAZ 2110 injector idle speed sensor are not “readable” by the automatic on-board power system, and it is not integrated into the “Check Engine” alarm system.

Diagnostics of the idle speed controller is carried out as follows:

There are several ways to analyze the idle speed sensor, but the main ones - the simplest and most effective - are the methods described below:

First way:

1. First you need to “get” to the device, disconnect it from the connecting block of wires 2. Using the most common voltmeter, check for the presence of voltage - the “minus” goes to the engine, and the “plus” to the terminals of the same block of wires A and D. 3. Turns on ignition, and the received data is analyzed - the voltage should be within twelve volts, if less, then most likely there are problems with the battery charge; if there is no voltage, then you will have to check both the electronic control unit and the entire circuit. 4. Then we continue the inspection with the ignition on, and analyze terminals A:B, C:D one by one - the optimal resistance will be about fifty-three ohms; During normal operation of the IAC, the resistance will be infinitely high.

Second way:

Also, with the sensor removed and the ignition on, if you connect a power supply to it, the conical needle of the sensor should move out; if this does not happen, it means it is faulty.

Third way:

1. Remove the negative terminal of the battery. 2. Disconnect the IAC from the block harness. 3. Using a multimeter, we measure the resistance of the external and internal windings of the IAC, while the resistance parameters of contacts A and B, and C and D should be 40-80 Ohms. 4. If the instrument scale is zero, it is necessary to replace the IAC with a serviceable one, and if the required parameters are obtained, we check the resistance values ​​in pairs B and C, A and D. 5. The instrument must detect an “open circuit.” 6. With such indicators, the IAC is in good working order, and if they are absent, the regulator must be replaced.

If the problem lies precisely in the operation of the regulator, then you should not rush and immediately go to a car service center, since you can clean the idle speed sensor yourself, as well as replace it.

Cleaning and replacing the idle air control.

The first thing you need to do is purchase a carburetor cleaner, and then get down to business: 1. The wire block is disconnected from the sensor. 2. Afterwards, both of its fastenings are unscrewed, and the sensor is removed. 3. If necessary, the IAC is completely cleaned of possible debris and contaminants on the cone needle and spring. 4. Also, do not forget to clean the mounting hole on the throttle assembly, where the conical needle of the sensor enters. 5. After cleaning, install everything in its original location.

If nothing has changed in the operation of the car - the same problems and inconveniences are present - then the regulator should be replaced.

It is worth noting that when purchasing you need to pay attention to the end mark 04. Sensors are produced with mark 01 02 03 04, so look at the mark of the old sensor and purchase the same one. If you put, for example, a sensor labeled 04 instead of 01, the sensor will not work. The following replacement is allowed: 01 to 03, 02 to 04 and vice versa.

Replacing the idle speed sensor can also be done without any problems:

1. The on-board system of the car is de-energized. 2. The block with wires is disconnected from the XX regulator. 3. The screws are unscrewed and finally the sensor is removed. 4. Attach the new device in the reverse order.

Idle speed sensor design

Composition of IAC:

• a small electric motor with a stepper type action;
• a rod with a calibrated thick needle-shaped cone and a spring;
• terminals for the block.

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Signs of inoperability of the idle speed sensor

Failures of the idle speed sensor 2112 relate to the electrical or mechanical parts of the device. Signs of malfunction:

• main symptoms: do not hold (“float”), intermittent, weak idle, the vehicle stalls at it, and also when driving in “neutral”, when the throttle valve is retracted, it stalls;
• It is impossible to start in a cold state without opening the damper (until the gas is pressed). On a cold unit, increased speeds are not observed at all; damping occurs after the gear is deactivated when the vehicle is moving;

The symptoms are identical to those for the TPS, but for the latter “CHECK ENGINE” is displayed; if this signal is observed, then it is the one that is broken. The location where the idle speed sensor is located must be distinguished from the location of the TPS.

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:

1. the engine “stalls”, for no apparent reason, at idle;
2. idle speed “floats”;
3. when a “cold” VAZ 2110, 2112 engine is started, there is no increased speed at all;
4. 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.

Checking the functionality of the idle speed sensor

You must identify the breakdown manually - there is no self-diagnosis. The idle speed regulator of the VAZ 2110 is located in the intake after the valve (throttle body).

First, analyze the electrical part with a multimeter:

1. The pinout of the IAC VAZ 2110 is being studied (available in the product instructions or on the Internet).
2. They check whether the sensor is powered normally, for which it is disconnected and the block is removed.
3. They take measurements of the two outer terminals on block A and D: Turn on the ignition, turn the multimeter to “continuity”, the black probe to ground (on the body itself) of the internal combustion engine, touch the positive (red) contacts one by one. A value within 12 V is normal. If not, the circuit is broken, the ECU is broken, the battery is discharged. This means we check the integrity (contacts, wires), the ECU (at pins 4 and 54 the norm is also 12 V), and the battery. If they are working properly, the problem is in the valve;

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.

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”.

Diagnosis of IAC mechanics

The mechanics may be broken. The main thing that is checked during diagnosis is the mobility (length) of the bolt cone. The 100% condition of the device can only be determined with a special stand or a special tester, but an eye check can also reveal the cause of the problem.

Checking the sensor for mechanical service involves removing it. Procedure:

1. We put the vehicle in handbrake.
2. Remove the “–” terminal from the battery.
3. Disconnect the block from the valve.
4. We clean, wipe the place where the product was located, the fastenings.
5. Unscrew the fasteners and remove the part.

Instructions on how to check the idle speed sensor on a VAZ 2110 (injector, 8 or 16 valves) after removing it:

1. We connect the sensor to the block.
2. We connect the battery.
3. We activate the ignition - the cone shutter should move forward. If this is not observed, there may be a malfunction of the rod (possibly coking) or the motor. The norm for the protrusion of the needle (cone) from the body of the product is 23 mm. When operational, if power is supplied, the rod changes position.

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).

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.

Cleaning DXX

You cannot ignore such a basic procedure as cleaning - this can give results, since sometimes parts of the product, contacts, become coked, covered with dirt and oil.

What you need for cleaning:

• cleaner (lubricant) WD-40 or similar cleaning products for equipment;
• cotton wool, clean rags, tampons.

Cleaning:

1. The sensor is completely dismantled, with the block disconnected.
2. The swab is moistened with the cleaning mixture. You can also spray the product with an aerosol.
3. Carefully wipe the contacts, needle, and installation sites, especially if oil is found there.

Before installation, the regulator is dried, the protrusion of the needle from the body is measured (the norm is 23 mm).

If the sensor has a malfunction of the electrical part - the winding, the electric motor - then repair is impractical or impossible. They buy a new product, especially since it is not too expensive (on average 500–700 rubles, but can be found for 250–300 rubles).

If the problem is in the block with wires (you can buy a new one), loose contacts or contamination, then repair is advisable. Repair also makes sense if there are serviceable parts of an identical product - you can disassemble it and try to replace these parts. But we must take into account that usually such a repaired device breaks down more often and the inconvenience caused by this will be very unpleasant, so it is usually more profitable to immediately buy a new product.

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.

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Source

Replacing and calibrating a new IAC

Replacing the idle speed valve sensor on a VAZ 2110: the part is inserted, the screws are tightened, the leads are connected according to the diagram (available in the instructions for the IAC or on the network). The idle speed control of the VAZ 2112 has 16 valves and on other vehicles with a power system of a similar design, it is located in the same standard way.

It is highly advisable to calibrate the IAC after replacement:

1. Ignition for 7–10 seconds, without starting during this time.
2. Start the internal combustion engine. Jumps and increased speed may be observed.
3. Turn off the engine - the rod will move to another extreme position.
4. Repeat the described steps 2-3 times.
5. Run the engine for approximately 5–7 minutes.

It must be remembered that the calibration is reset after disconnecting the IAC or after removing the negative terminal from the battery. This procedure will help the speed “stand up” more correctly for better functioning of the system.

The principle of operation of the XX (IAC) regulator on the VAZ-2110

Let's consider the principle of operation of the XX regulator. This element is part of the design of the throttle assembly, which dispenses the air entering the cylinders.

When the gas pedal is released, the throttle valve closes the main air intake channel. To ensure the engine operates in this position of the damper, an additional channel of small cross-section is made in the throttle body, through which air is supplied to the cylinders, bypassing the damper. The idle speed control is designed to change the cross-section of the additional channel, which allows the ECU to maintain speed regardless of conditions.

It all works like this: when the throttle valve is closed, the XX regulator slightly opens the bypass channel. Using the mass air flow sensor, the amount of air entering through the additional channel is determined. Based on this information, the ECU regulates the amount of fuel injected. Using data from other sensors, the control unit determines the crankshaft speed and, if they do not correspond to the norm, sends an impulse to the IAC in order to stabilize the engine operation by changing the channel cross-section.