The idle speed sensor is working. How is the idle speed sensor replaced on a vaz independently

19.08.2023

"Floating" speed on injection VAZ 2110 is a very common problem that is usually dealt with by replacing the idle speed controller. However, not everyone knows where this regulator is located, how it can be changed and how much this venture will cost.

What is the idle speed sensor VAZ 2110 responsible for?

How to choose the right IAC and what is the price of acquiring a fake

It is known that two types of regulators were supplied to the conveyor for the VAZ 2110: 2112-1148300-02 - manufactured by KZTA (Kaluga) and 2112-1148300-01 - manufactured by Pegas (Kostroma). Also on the shelves of auto products you can find analogues of the above models, but already equipped with a hat: 2112-1148300-04 and 2112-1148300-03, respectively. There is also an IAC under the Omega brand (Moscow) - 2112-1148300. The most popular models on the post-warranty service market are Omega (yellow box) and KZTA (blue box).

But when choosing a new sensor, you must beware of fakes. You should pay attention to the quality of the font on the package (crooked words are a sign of handicraft production), the presence of stickers with a hologram on the body of the product. In the case of the Kaluga sensor, a special sticker on the end of the box becomes a distinctive moment - “for authentication”. As for the quality of the product itself, real products do not provide for backlash of the locking needle, while a fake often sins with this and in fact fails very quickly. In any case, the needle should not rotate. The gaps in the regulator housing are also unacceptable - air leakage may occur.

How much is the idle speed sensor VAZ 2110

The average cost of a high-quality idle speed controller on a VAZ 2110 is 500-600 rubles. At the same time, you can find many models on the market that boast more than half the price tag. But do not rejoice prematurely. As practice shows, the service life of such specimens does not exceed 6-10 months of daily driving.

Which IAC to take for a particular motor: 8 valves or a 16-valve injector

They say that all regulators that have the beginning of the article in the form of 2112-1148300 are interchangeable.

2112-1148300-01 - for a similar one or with the number 2112-1148300-03;
2112-1148300-02 - for a similar one or with the number 2112-1148300-04.

How to check if the sensor is working

The following symptoms may indicate a possible failure of the IAC:

"floating" idle speed;
stalling when shifting to neutral gear;
no increase in speed during cold start;
noticeable when consumers are turned on (stove, headlights, etc.);
spontaneous increase / decrease in speed.

It should be noted that the error "" does not light up in such cases.

You can check the IAC using a multitester. Measuring circuit resistance readings is done as follows:

first, conclusions A and B are checked, then C and D - a working sensor will give out 50-80 Ohms;
the second step is the measurement of ohms in pairs B and C, A and D - here the infinity of the value should be observed, which is the norm.

It may also be relevant to check the voltage going to the regulator:

the negative probe of the voltmeter is installed on the "mass", the positive one - on the terminals of the pads A and D;
when the ignition is turned on, the voltage on both terminals should show at least 12 volts: if less, then the battery is discharged, if there is no voltage, an open circuit.

How can I clean the sensor

Often, the work of the IAC can improve just as a result of cleaning it. For this procedure, you will need WD-40 or a carburetor cleaner. The composition must be applied to a regular hygienic stick with a cotton swab at the end. After disconnecting the wiring harness from the sensor, try to carefully wipe all the contacts of the pad and harness with a stick. To be sure that the assembly is clean, you will have to remove the regulator from the seat and clean the needle liberally with a jet of WD-40 or carburetor cleaner. After that, do not forget to dry the sensor. Then everything is installed in place and checked for operability.

Do-it-yourself IAC repair

But if you make sure that the device does not function, and cleaning does not work, You can try to fix it yourself:

first you need to remove the three studs that fix the body - the so-called rivets;
then the connector housing is carefully removed (at this stage, you can inadvertently damage the wires);
if the cause of the malfunction turned out to be a wire torn off from the place of solder, then eliminate the breakdown by soldering the contact and opening this place with varnish - against corrosion;
the drive of the guide needle has worn out, the guide itself - you can safely go for a new IAC.

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19.10.2012

The idle speed sensor (dxx), or rather, the “idle speed controller” (rxx) on the VAZ 2114 and on other families of Samara is designed to stabilize and automatically adjust the idle speed. The idle speed sensor is an electric motor with a conical needle.

Where is the Idle Air Control (IAC) located?

The idle speed sensor is located on the throttle body. The idle speed sensor is located next to the throttle position sensor. The DHX is attached with two screws. It is also found that the sensor is planted on varnish.

Photo of the idle speed sensor (pxx)

The idle speed sensor is located at number 3. Next to number 4

The principle of operation of the idle speed sensor (pxx)

At the moment when we turn on the ignition, the stem on the idle speed controller fully extends and rests against a special calibration hole in the throttle pipe. After, the sensor counts the steps and returns the valve to its original position. The position of the original valve depends on the firmware: for example, January 5.1 - 120 steps on a warm engine, Bosch - about 50 steps on a warm engine.

On a warm engine, at the time of adjustment, the sensor is at around 30-50 steps. As the steps increase or decrease, the volume of air passing through the calibration hole constantly changes. Moreover, if the stem is pulled out, then the steps increase and vice versa. The stroke of the rod is 250 steps.

At the time of purchase of the idle speed sensor for a VAZ, the distance from the stem head to the flange should be no more than 23mm. Carefully measure the length of the protruding head.

The engine receives a certain amount of air necessary for the normal operation of the engine, thereby regulating idling.

The incoming air is analyzed by the mass air flow sensor () and, in accordance with its amount, supplies the required amount of gasoline to the engine through the fuel injectors. According to the crankshaft position sensor (), the controller monitors the number of engine revolutions and controls the idle speed controller. This is how the process of supplying the required volume of air occurs.

On a cold engine, the controller increases the speed due to the idle speed sensor (pxx) and increases the engine speed when warming up. This mode allows you to immediately start moving without warming up.

It is recommended to install an idle speed sensor from the omega group with the number 2112-114830. Also good IAC 2112-1148300-04 "KZTA". It is worth noting that when buying, you need to pay attention to the end mark 04. Sensors are produced with marks 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 with label 04 instead of 01, the sensor will not work. Such a replacement is allowed: 01 to 03, 02 to 04 and vice versa.

Signs of a malfunction of the idle speed sensor (pxx)

Unfortunately, the idle speed controller is not equipped with a self-diagnosis system, so neither the on-board computer () nor the illuminated check range will tell us about this. But if you encounter the following problems, then the sensor needs to be checked (), cleaned () repaired () or replaced () in case of a malfunction.

It stalls at idle.
Idle speed fluctuates.
When starting a cold engine, there is no increased speed.
It stalls when the transmission is removed from the box.

In principle, all the symptoms of IAC death are similar to the symptoms. But the difference is that when the TPS dies, the on-board computer will show an error or the check-range will light up.

How much is the idle speed sensor?

You can buy an idle speed sensor for a VAZ at any auto parts store in your city. The cost of the sensor is about 350 rubles. Beware of fakes.

If there are problems in the operation of the idle speed sensor, it may be difficult to control your VAZ 2109. To determine the breakdown and learn how to correctly change the sensor, we will acquaint you with the basic provisions.

Principle of operation

It is not entirely correct to call the idle speed sensor a sensor. After all, they are measuring instruments that process and convert information, display it on mechanical or electronic indicators on the dashboard.

It is correct to call the idle speed sensor a regulator, or simply IAC. IAC plays an important role in the operation of the engine, as it ensures the smooth and correct behavior of the power unit.

Alas, the self-diagnosis systems on the VAZ 2109 are not perfect, therefore, if the idle speed controller fails, the car does not notify you of this even by turning on the Check Engine signal light. Therefore, you have to navigate by signs of breakdown.

The IAC works as follows. When the ignition switch is turned on, the rod on the sensor extends to the stop, while resting against a special hole in the throttle pipe. The IAC starts to read the steps and the valve returns to its original position. When the motor is running, increasing or decreasing the number of steps changes the volume of air entering through the opening. Therefore, the necessary amount of air enters the engine, which ensures stable operation of the engine at idle.

Functions

IAC regulates the amount of air entering the engine when the throttle is closed. This suggests that the IAC performs the functions of automatically adjusting the set engine speeds at idle.

Also, the regulator takes part in the process of warming up the engine to optimal operating temperatures in winter. The operating temperature range of the IAC is quite wide - from -40 to +130 degrees Celsius.

IAC, with such important functions, is small in size and consists of three main elements:

Stepper motor;
Spring;
Rod with a cone-shaped needle at the end.

The idle speed controller is mounted on the throttle body with a pair of screws.

Symptoms

In no case should you ignore the signs of failure of the idle speed sensor on your injection or carburetor VAZ 2109. At first, this will cause discomfort while driving, but soon it can cause a serious accident.

There are several main symptoms that may indicate problems with IAC:

Turnovers spontaneously begin to increase, then decrease;
When you turn on a cold power unit, the speed does not increase;
When using additional electrically dependent devices, such as headlights or a heater, idling speed immediately begins to drop;
When disengaging or idling, the engine may stall.

This is not a complete list of possible symptoms, but they are all indirect. Therefore, to make sure that the problem lies precisely in the IAC, and not in other engine components, it is necessary to check the current state of the sensor.

Status check

To check the current status of your IAC on a VAZ 2109 car, follow several sequential steps.

Check step	Your actions
Step one	Engage the handbrake on the car, install wheel chocks. Safety should always come first when repairing a car with your own hands.
step two	It is necessary to get to the desired sensor, disconnect it from the power block with wires, and then use a voltmeter to check for voltage. The minus is placed on the engine, and the plus is installed on the terminals of the wire block A and D
Step Three	Turn on the ignition, check the voltage readings. Normally, they are about 12 volts. If the voltmeter shows lower values, there may be a problem with the battery charge level. If there is no voltage at all, you will have to check the entire computer and the electrical circuit. Breaks are excluded.
Step Four	Carry out one more check at the included ignition. Check terminals AB and CD in turn. In the normal state, the resistance on them should be approximately 53 ohms. If the IAC is working properly, the meter will show infinite resistance
Step five	With the idle speed controller removed and the ignition on, connect the power connector to it. If at the same time the conical needle has moved out, everything is fine with the device. If the cone-shaped needle does not extend, then the IAC is out of order and needs to be replaced.

Having determined that the old idle speed sensor has already worked its way out on the VAZ 2109, it needs to be replaced. The procedure is quite feasible without outside help.

Replacement or cleaning

Practice shows that in a fairly large number of cases, a simple cleaning of the idle speed controller allows you to restore its performance. Therefore, we advise you to try this method first. And if he does not give a result, then it will not be difficult to replace the device.

Buy a container of carburetor cleaner. In this case, your engine may well be injection. It's just that this composition is great for cleaning the IAC and not only.
Disconnect the block with wires from the sensor, unscrew the two fasteners and directly remove the affected regulator itself.
Clean the regulator from accumulated debris, dirt, be sure to clean the needle itself and the spring. You need to do this with a carburetor cleaner. Use improvised means in order to tidy up a fairly compact device.
Be sure to clean the idle speed controller seat on the throttle assembly. This is where the cone-shaped needle of the XX sensor enters.
After completing the cleaning of the device, return it to its place and check it in operation.
If the cleaning did not bring the desired result, the engine continues to behave inappropriately, you will have to purchase a new regulator and install it in place of the old sensor.
Before replacing, be sure to turn off the car by disconnecting the negative terminal from the battery, then disconnect the block with the supply wires, unscrew the mounting screws and remove the device.
Reassemble in reverse order.

IAC (idle speed controller) is a very important thing. The engine will be able to run without the IAC, and you will even be able to drive a car with a failed IAC, albeit with difficulty. However, such a trip will only be to the nearest repair site, because. you will have to constantly "gas up" - the speed will instantly drop every time you release the gas pedal, and the engine will strive to stall, which is extremely inconvenient.

What does RHK do? It regulates the passage of air through the bypass channel of the throttle assembly. Thus, the main air flow is controlled by the position of the throttle, but even if the throttle is closed (the gas pedal is released), the IAC opens the bypass channel, thereby maintaining the idle speed. It also determines the speed when starting and warming up the engine.

The IAC working tool is a rod with a tip that covers the opening of the bypass channel. The rod moves thanks to a stepper motor located inside the IAC, which in turn is controlled by the ECU. If the stem is extended, the bypass channel is closed, otherwise it is open. Along the way, one point should be noted: the IAC is not diagnosed, and if it malfunctions, it is useless to watch engine errors.

The photo below shows the bypass channel of the throttle assembly with the IAC removed, marked: 1 - inlet of the absorber purge hose (not relevant to the topic), 2 - inlet of the bypass channel (air intake from the air filter), 3 - outlet of the bypass channel (air supply into cylinders). It is in hole 2 that the IAC tip rests.

What IAC is suitable for VAZ-2108, LADA Priora, LADA Kalina?

The question of interchangeability is very burning. In stores, they hang you from three boxes. For example, they may indicate that this one is for Kalina, and this one is with a certain "thin needle". Naturally, the prices will differ, but it is not so much the price that hurts, but the ignorance of the sellers. So, for VAZ, there are two types of IAC - for "front-wheel drive" and for Chevrolet Niva (or maybe for a simple "Niva"). They are designed for different engine volumes and, as a result, passing air.
Below are absolutely interchangeable IACs (do not pay attention to the extended stem): 2112-1148300-02 - stood on the injector "eight", 2112-1148300-04 - the one that was presented as "Kalinovsky", and which was successfully delivered to the VAZ- 2108 (engine VAZ-2111). If you look in the passport 2112-1148300-04, it will not say about any "Kalina", and the part index does not say anything about it either.

How to replace IAC with VAZ

The replacement, it would seem, is elementary, but it can fray the nerves. You don't need to take anything extra. The IAC is held on by two screws, it stands tightly in the throttle assembly, thanks to the rubber ring. This is the ring that loves to get on your nerves. The manual says that you need to put the ring on the IAC, lubricate it with oil and insert the regulator, but it didn’t happen - it doesn’t get up! We need to do it differently: we insert the ring into the seat in the throttle assembly, and after that we put the IAC, then it, using its conical shape, gets up without problems.

IAC - idle speed controller VAZ 2114, which is also often called a sensor, performs the functions of regulating in automatic mode and idling stabilization.

General information about the regulator

The described idle sensor is one of the key components, which, together with other devices, ensures the uninterrupted and coordinated functioning of the entire "organism" of the vehicle.

The IAC is located on the throttle assembly, or rather, on its body.

It is not difficult to find the element of interest to us, it is located near the sensor that controls the throttle. As a rule, the regulator is connected to the throttle mechanism with small screws. In rare cases, there is also the option of attaching the sensor with varnish.

Idle speed regulator VAZ 2114 - principle of operation

The rod located on the IAC, when the driver turns on the ignition of the car, extends to its entire length, and then abuts against a special calibration hole, which is located in the throttle pipe. After the regulator has marked a certain number of steps, it resets the valve.

If the engine of the machine is warm, the sensor at the beginning of the adjustment is located at around 40 steps. The volume of air with a decrease or increase in the number of steps is constantly changing:

they decrease if the stem is retracted;
they increase when the stem is pulled.

The stroke rate on the VAZ 2114 is 250 steps.

A given volume of air enters the internal combustion engine, which makes it possible to qualitatively control the XX. Air entering the engine is studied by the DMRV (flow sensor). And then, based on this analysis, the DMRV controller directs the required amount of fuel through the fuel injectors. Another sensor, whose task is to adjust the position of the crankshaft, monitors the engine speed and controls the functioning of the IAC.

If the engine is cold, due to the regulator XX described by us, the controller has the ability to increase the engine speed. Thanks to this mode, the vehicle can start moving without preheating.

Symptoms of a malfunctioning IAC

The car's on-board computer cannot signal to the driver that the VAZ 2114 idle speed controller is out of order, since it is not equipped with a self-diagnosis device. Therefore, experienced motorists pay attention to the behavior of their car, which tells them about troubles with the IAC.

The following symptoms are signs of a regulator malfunction: