Replacing the idle speed sensor on a VAZ 2113, VAZ 2114, VAZ 2115

Idle air control on VAZ 2114: signs of IAC malfunction

If instability occurs in the idle speed, the first thing car owners are advised to do is check the condition of the idle speed sensor. Instability of the operation of the DXX or the XX regulator is manifested in the following:

1. When driving, the car stalls when changing gears;
2. The revolutions then drop sharply, then begin to increase again.

If you find one of these problems, the IAC will most likely have to be replaced. But first, let’s figure out what kind of device this is.

Appearance and location

DXX is responsible for adjusting the idle speed. Hence the other name - idle air control. Externally, the device is a miniature electric motor, at the end of which there is a small cone-shaped needle.

Where is he located? The IAC is attached to the throttle body using two screws or regular varnish. Next to the DHW there is a throttle position sensor. Therefore, there should be no problems finding the sensor.

Cleaning the idle speed sensor

1. Disconnect connectors and terminals;
2. Using a brush and carburetor cleaner, wash the cone needle and contacts;
3. Pour the cleaner over the entire device, leave it for a while, then use a small brush (you can use a toothbrush) to clean out all the dirt (not forgetting the needle, spring, throttle valve);
4. Install the dhx in place, after first cleaning the valve seat and air channel, also cleaning and lubricating the o-ring.

If there are scratches, abrasions or other deformations on the idle speed control, it must be replaced with a new one.

Malfunctions

The peculiarity of the idle speed sensor is that it is impossible to trace the occurrence of a malfunction due to the operation of the on-board computer. The system does not recognize a breakdown, so everything has to be done manually.

There are several characteristic signs that can tell you about problems with the XX sensor:

1. The car often stalls when idling;
2. A phenomenon called floating speed occurs;
3. There are no increased speeds when starting a cold engine;
4. If the gear is switched off, the engine may stall spontaneously.

There are also a few errors on the on-board computer, but you shouldn’t rely solely on them.

Many people confuse the signs of IAC failure with the throttle position sensor. The symptoms are indeed very similar. But the point is that the on-board computer signals a breakdown of the position sensor, but regarding the IAC it is silent.

First way

• Get a tester if you haven't had one before.
• Disconnect the DXX from the block with wires.
• If you have a 1.6-liter engine, then be sure to disconnect the throttle assembly fasteners and move it from the receiver about 1 centimeter.
• Use a voltmeter to check if voltage is being supplied to the regulator. The minus is connected to ground, and the plus goes to the block - use the AD pins.
• With the ignition on, the tester should show at least 12 W.
• If there is no voltage, then there is a problem in the power circuit or electrical unit of the car.
• If there is voltage, but it is significantly less than 12W, then this indicates a low charge level of your battery. Be sure to recharge the battery.
• After checking the circuit for efficient operation, proceed to study the DXR itself. At this stage the ignition is turned off.
• In turn, connect the terminals to the tester to pairs A-B and CD. The normal resistance should be approximately 53 ohms.
• Change the pairs to AC and BD. When measuring them, the resistance should turn out to be infinitely large.

If the check shows that the readings do not meet the standards, then several actions can be taken:

1. Clean the contacts, throttle body, needle needle and other sensor components using carburetor cleaner. It is not difficult to find, and it is cheaper than specialized cleaners;
2. If possible, try to repair the IAC;
3. If it is impossible to carry out repairs, replace the old sensor with a new regulator.

Faulty sensor

Second way

For this testing option, you will need a simple tester that you can easily make yourself. We offer corresponding video instructions

Now we proceed as follows.

• Unscrew the fastening screws of the regulator and remove it from its seat.
• The location of the DXX is already well known to you.
• Disconnect the regulator from the main block, and apply the finger of your right hand.
• And the index finger. You don't need to put a lot of effort into creating a set.
• The nuance of placing a finger lies in the features of the regulator itself, at the end of which there is a cone-shaped needle.
• If the engine stops working, then if the IAC is working properly, the needle comes out completely.
• Your finger will allow you to feel a slight jolt when you turn on the ignition.
• If this push is absent, then the device has failed.

The maximum distance from the protruding rod head to the flange is 23 millimeters. When buying a new IAC, be sure to take this fact into account.

Regulator replacement and calibration

IAC for most models is inexpensive. Therefore, it is advisable to purchase original spare parts. Usually it is not difficult to buy such a part. For almost any car it can be found in physical or online auto supply stores.

The replacement is done like this:

• Check the distance from the seat to the needle on the new part. It is normally 23 mm;
• Remove the negative from the battery;
• Remove the old regulator and replace it with a new one;
• Connect the battery;
• Insert the key into the ignition and turn one turn. There is no need to start the car. In about 5 seconds the sensor should calibrate;
• Turn off the ignition;
• Start the power unit and test the functionality of the DHW. To do this, you need to monitor the speed at XX. If they are normal and all previous problems have disappeared, then the work was done correctly. If the procedure does not help, it is advisable to contact a service station for a professional check and restoration of the car.

You can drive with a broken sensor. This is not prohibited by traffic rules. But operating a machine with such a problem is not very comfortable. Therefore, it is recommended to eliminate it within a reasonable time.

A Question of Choice

When checking the sensor, we found out that the device was faulty and needed to be replaced. But what should we choose in its place?

Today, two types of devices from different manufacturers are in particular demand for the VAZ 2114 - OMEGA and KZTA.

In the case of OMEGA, pay attention to number 2112-114830. If you decide to choose KZTA, then the option that suits you has catalog number 2112-1148300-04.

The last two digits may be different, and this is a very important point. If your IAC number ends in 01, you should not change it to 03, otherwise you will simply waste your money. The device is replaced with a similar one or with a subsequent number - 01 is changed to 01 or 02, etc.

The cost of the IAC is around 300-400 rubles, depending on the region and the specific store. Be careful, as there are now an impressive number of fakes on the market.

Replacement

To work you will need:

1. New regulator suitable for your VAZ 2114;
2. Rags;
3. Crosshead screwdriver;
4. 13mm wrench;
5. Carburetor cleaner;

Having the necessary tools and materials available, you can get to work.

• Place the car on a level surface and turn on the handbrake.
• Raise the hood and secure it firmly to avoid unnecessary injury.
• Disconnect the negative terminal from the battery. IAC is an electrical device, therefore this event is mandatory.
• Remove the protective casing from the power unit.
• Loosen the clamp slightly to disconnect the rubber tube from the air filter connection. This is necessary so that the tube does not interfere.
• Remove the clamp that holds the air filter pipe. The corrugation is disconnected and moved slightly to the side.
• The fastening screw of the cable going from the gas pedal to the throttle valve needs to be loosened slightly.
• Use a rag to remove all dirt near and on the throttle assembly itself.
• Treat the throttle assembly mounting nut, as well as the IAC mounting screws, using the almighty WD40. This will make dismantling easier.
• Remove the throttle assembly completely. To do this, unscrew two nuts using a 13 mm wrench.
• Remove the sensor connector from the terminals.
• If there is dirt at the contact points between the DHH and the throttle assembly, be sure to remove it with a rag.
• Using a screwdriver, unscrew the two fasteners that connect the throttle assembly and our desired sensor.
• Remove the regulator from the mounting socket.
• Clean the entire throttle body with carburetor cleaner.
• Install the new regulator in the same position as the newly dismantled DXH was in.
• Use engine oil to treat the new rubber gasket, which should come with the IAC.
• Replace the two screws and make sure the adjuster is firmly seated in the throttle body.
• Return the remote control to its place and check how securely the nuts are secured.
• Connect the connector to the device terminals.
• Reinstall the cable, pipes and tubes. Tighten all clamps properly.
• Reinstall the engine protective cover.

Replacement procedure

After assembly, a very important stage remains - calibration of the new IAC. To do this, you need to connect the battery and turn on the ignition. 10 seconds is enough. During this time, the electronic control unit will perform calibration on its own.

That's it, the new regulator is ready for use. To avoid problems with replacement, watch the training video.

Tips for extending the service life of IACs

To increase the service life of the sensor, you need to follow simple rules:

1. The air filter device must be replaced on time.
2. You cannot park your vehicle for long periods of time in winter. At low negative temperatures, the car owner must periodically start the power unit, warm it up and perform gas changes. This will allow the valve to be designed to prevent it from sticking.
3. Do not allow foreign liquids to enter the throttle mechanism area. Sprays for quick starting of the engine usually do not pose a danger to the sensor, but it is better not to overdo it.

Repair

It is not always possible or even the desire to spend money on buying a new device. Regardless of the reasons, it is quite possible to try to solve the problem of a failed or poorly functioning idle speed sensor using a repair method.

• Try cleaning the old sensor.
• To do this, you should dismantle it and thoroughly clean all contacts using a cotton swab soaked in carburetor cleaner.
• Next, the rod, needle and spring are generously treated with cleaner.
• A toothbrush can easily clean areas smeared with carburetor cleaner.
• Rinse the device again and then return it to its place.
• Not infrequently, such events made it possible to achieve excellent results; idle speed began to work again as before.

But this is the simplest repair option, which is not always worth counting on. There is a more complex, but at the same time more effective option for self-repairing a failed idle air control:

1. Remove the sensor, clean its external elements, as indicated in the previous repair method;
2. Remove the three pins securing the sensor housing;
3. Remove the regulator housing as carefully as possible. Really slow and careful not to damage the contacts;
4. After disassembly, you may notice the presence of broken solder. In this situation, the wire is soldered in place, and the soldering area is treated with a special anti-corrosion varnish;
5. If there are gaps in the body of the gap adjuster, they are eliminated using sealant. This will prevent air from being sucked in through the valve.

If, when disassembling the device, problems are discovered on the winding or the needle is worn out, repair will not help. You will have to change the IAC completely.

The issue of malfunctioning idle air control is quite common in the case of the VAZ 2114. This element cannot be called the weak point of the car, but no one wants to face such a breakdown. As, indeed, with any other malfunction. But where can you get away from them?!

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Cold speed sensor or IAC on VAZ 2114 and 2115: looking for and changing

To adjust the idle speed on the VAZ 2114 and VAZ 2115, an idle speed sensor (IAC) is installed. Like any device, the IAC is subject to wear and tear, which means it may become unusable over time. This will negatively affect the operation of a car with an injector. The article discusses the principle of its operation, signs of malfunction, and provides detailed instructions for replacement. Photo and video materials are attached to the article.

Description of IAC

The idle speed sensor refers to measuring instruments that are used to measure and convert data. It would be more correct to call it a regulator.

Appearance of DXX

Principle of operation

The purpose of this device is to regulate the volume of air that enters the fuel system when the throttle valve is closed. Thus, the number of revolutions of the power unit at idle is automatically adjusted. The XX regulator is used in winter to warm up the engine to the required temperature.

When the ignition is turned on, the IAC rod extends to its full length and rests against the calibration hole of the throttle pipe. The sensor then counts the steps and the valve moves to its previous position. On a warm engine, the XX device during adjustment is located at around 30-40 steps.

When you change the number of steps, the volume of air that passes through the calibration hole changes. Thus, the required volume of air enters the fuel system, which ensures normal engine operation at idle. When the rod is extended, the number of steps increases. The stroke of the rod is 250 steps.

Location

In order to check or replace the XX regulator, you need to know where it is located. On VAZ 2114 and 2115 cars with an injector, it is located on the throttle body. The sensor is attached using threaded mounting screws.

DXX location

Basic faults

The IAC is not equipped with a self-diagnosis system, so the on-board computer cannot check it and send an error code to the dashboard.

But there are a number of signs by which we can conclude that the device is faulty:

• uncontrolled change in engine speed (random increase or decrease);
• the engine suddenly stalls when idling;
• it is impossible to increase the number of revolutions when starting a cold engine;
• when using devices such as headlights, a stove, etc., the number of revolutions of the power unit at idle simultaneously decreases;
• the engine stalls when changing gears;
• happens from the development of a cone of overestimation XX.

These symptoms may also occur if other sensors are faulty, but the computer can check them and display the corresponding error code on the instrument panel.

New IAC for replacement

Cleaning methods

If it turns out that the problems in the system are due to a faulty IAC, you should not rush to buy a new device. It's better to clean and check the old sensor first.

To do this, you need to purchase a carburetor cleaner. To clean the XX device, you need to remove it. First you need to disconnect the wire block, and then tighten the mounting screws and remove the device.

Removing the DXX from the throttle assembly

The regulator should be thoroughly cleaned of dirt and debris. The conical needle and spring require special attention. In addition, you need to clean the location of the IAC on the throttle assembly. After cleaning, the device must be checked for serviceability and returned to its original place.

Replacement and installation instructions

If there is a need to replace the regulator on a VAZ 2114, then you need to perform the following steps:

1. First, turn off the vehicle's power supply by removing the negative terminal from the battery.
2. Next, you should disconnect the wire block from the sensor.

Wiring Harness Disconnection Process

• Then unscrew the two screws and remove the regulator.
• Taking a new device, we install it in place of the dismantled one. Before installation, lubricate the O-ring with engine oil.
• We fasten the IAC with two screws.
• Then we connect power to the new device.
• We connect the negative terminal to the battery (video author Roman Lozovoy).

If you cannot remove the regulator, you should dismantle the throttle assembly, and then unscrew the screws in a convenient way and replace the sensor.

Thus, you can clean or replace the XX regulator yourself if, due to its malfunction, the operation of the VAZ 2114 engine is disrupted. Similar measures should be applied in the case of the VAZ 2115. Replacing the regulator yourself makes it possible to save on car service.

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Video “Replacing IAC”

In this video, Vasily Kalugin demonstrates how to remove and replace the idle speed sensor on a VAZ 2115.