Replacing the idle speed regulator VAZ 21214

The regulator, idle speed sensor Niva-21214 injector is responsible for the cold start of the engine and its operation at low speeds when the gear is off. Previously, on carburetors, these functions were performed by 2 units: an air damper with a cold start membrane and an electric valve with an idle jet.

To some extent, diagnosing malfunctions was easier than after the advent of the electronic fuel control system. Nevertheless, if you wish, you can also understand it in order to detect problems with the regulator and fix them yourself.

Purpose and design

Idle speed sensor

(VAZ “injector” 1.6) is a device that keeps the idle speed of the engine under control.
Replacing the idle speed regulator for Niva VAZ 21213, 21214. With its help, the internal combustion engine can maintain rational modes during operation, thereby increasing the service life of all its components. In addition, idling speeds can warm up the engine to operating temperature during cool periods. Thus, the idle speed sensor (including VAZ 2110) plays an important role in the operation of the car’s internal combustion engine. By the way, it consists of only 3 components:

Spring.
Stepper motor.
A rod with a conical needle at the end.

A more detailed design of this element is shown in the picture below:

Additional function of the regulator

An additional function of the device in question is to block the air flow in forced idle mode. This mode is activated when 3 conditions are met:

Under such conditions, it is impractical to supply the air-fuel mixture to the cylinders, since the car moves by inertia. So fuel will be wasted. Therefore, based on the damper and speed sensors, the controller stops the supply of fuel and air, giving the corresponding commands to the injectors and the idle speed controller. When the speed drops below 1800 rpm or the driver presses the gas pedal, the supply of the combustible mixture is resumed. If the driver switches the gearbox to the neutral position, the regulator opens the channel, and only idle speed is activated.

Signs of trouble

The following signs may indicate a malfunction of the idle speed sensor:

“Floating” engine speed at idle.
Poor starting of the internal combustion engine even when the gas pedal is pressed. This is often the reason why the sensor needle is blocking the channel.
When the car warms up, the engine speed does not increase.
Sudden engine stop in neutral gear.
A noticeable drop in speed after turning on energy consumers such as the stove, air conditioner, headlights and radio.

When listing the signs of a malfunction of the idle speed sensor, it should be noted that such “symptoms” can also be caused by other devices (for example, a fuel filter or spark plugs) that are connected to the fuel supply system. How to remove the idle speed control of a VAZ 2121 Niva 2131. Therefore, before changing the idle speed sensor, the VAZ 2110 must be diagnosed to ensure the proper operation of a number of other important parts. Only after making sure that the DX is faulty can you begin to replace it. Otherwise, all the work will not bring the desired result.

Additional function of the regulator

An additional function of the device in question is to block the air flow in forced idle mode. This mode is activated when 3 conditions are met:

the car is coasting;
any gear is engaged;
engine speed above 1800 rpm.

All VAZ Sensors Location. All VAZ NIVA drivers need to know this. DPS, DMRV, DPKV, DPRV, IAC

In my videos: All sensors and their effect on the engine. What is the idle speed sensor for VAZ, replacement of the speed sensor for VAZ 2110, 21214,. sensor malfunction

and consequences. Company.

Next, we draw the sensor circuit and see if the voltage is suitable for it. For this, a regular voltmeter is used. To determine the voltage, first connect the negative terminal to ground and connect it to the terminal block “A” and “D” (they are often marked on the block). Now turn on the ignition and look at the voltmeter readings: if the voltage on the scale is less than 12 volts, your battery is probably low. If there are no signs of current supply at all, the entire circuit or the electronic control unit is faulty.

If the voltmeter shows a voltage of 12 volts or more, continue the experiment. Turn off the ignition and begin checking the VAZ 2110 idle speed sensor itself. The tester terminals are connected to terminals A, B, C and D. In this case, the total resistance should fluctuate around 50-55 Ohms. Idle speed regulator for the VAZ-21214 engine, its meshes and fuels. Sensor replacement. The idle speed sensor of the VAZ 2114 can be easily changed when... After this, it is necessary to measure the resistance in pairs - its values should be infinitely large. If the idle speed sensor (VAZ 21214, for example) gives different readings, it means it is faulty and needs to be replaced. If the values correspond to the norm, most likely the problem lies in the spark plugs or other elements of the car. In this case, you need to go to a service station for diagnostics.

Where is the Chevrolet Niva located?

As follows from the description of the principle of operation, the regulator is located on the body of the throttle unit of the power system, at the bottom left in the direction of travel . It is located rather inconveniently, which can create problems when replacing it without a certain skill.

The IAC is placed in the housing socket and secured with two screws . Between the regulator and the body there is a sealing rubber ring that prevents air from leaking around the valve.

A clearly visible sector placed on the throttle axis will help you visually locate the regulator . A cable from the accelerator pedal connects to it, which is clearly visible when looking at the engine from above. There are two sensors located on the side of the throttle assembly opposite the cable. The upper one is on the same axis with the cable sector - this is the throttle position sensor (TPS). And the required IAC stands immediately below it, on the same side.

How to check the DXX for serviceability? Method number 2

You can use an alternative method. To do this, completely remove the idle speed sensor and connect the block to it. Next, by lightly pressing the tip of the DXX needle with your finger, we check how far it has extended. Ideally, a working sensor will fully extend this element when the ignition is turned off. This way your finger should feel a slight jolt. If this does not happen, then the device is faulty and must be replaced. But DXX can be restored, but more on that a little later.

We are looking for the reason why the idle speed on the VAZ 21214 floats

The first thing I recommend paying attention to is the mass air flow sensor (MAF or flow meter). Read this article on how to check the mass air flow sensor.
The second “suspect” usually becomes the idle air regulator (IAC), if after checking the flow meter you do not find anything, check the IAC.
After this, inspect the wiring of the speed sensor (DS). Read how to check and replace the DS here.
The next sensor that can cause floating idle speed is the crankshaft position sensor (CPS). The sensor itself is unlikely to have failed; most likely the reason is in the wiring or chip. If you don’t find anything strange in the wiring, check the DPKV.
The throttle assembly can also often affect the idle speed, so it would be a good idea to check the TPS (throttle position sensor), as well as the throttle valve itself, it may need cleaning. How to clean the throttle valve I wrote here.
Plugs, high-voltage wires and the ignition module can cause problems with idle, so first check the high-voltage wires, and then the spark plugs.
Engine idle speed fluctuates often due to a faulty idle speed solenoid valve. To test this valve, remove power from it, then turn on the ignition and connect the power wire to the contact on the valve. In this case, you should hear a distinct click; if this does not happen, connect the wire to the contact that is connected to the “positive” terminal of the battery. Even if you do not hear a click, you can conclude that the valve is faulty. If there is a click, but the engine speed fluctuates as before, check its jet.

How to restore the idle speed sensor?

In some cases, in order to restore this part, it is enough to simply clean it thoroughly. Cleaning the sensor itself is a very easy process, and for repairs it is enough to have only WD-40.

So, how to restore the idle speed sensor on a VAZ 2112? At the first stage, the two nuts securing the throttle assembly are unscrewed. The latter, as in the case of replacement, is moved 10 millimeters to the side. Next, the wire block is disconnected from the sensor. WD-40 is applied to a cotton swab, and all channels are thoroughly cleaned with it. Next, use a Phillips screwdriver to unscrew the two bolts that secure the VAZ 2110 idle speed sensor. If there are no fasteners here, then you will have to remove the entire throttle assembly. Next, the mechanism itself is pulled out. If it is covered in oil and black dirt, then in addition to cleaning the throttle body, you will need to clean the entire throttle body.

Next, WD-40 is applied to a conical needle with a spring. Thus, after a few minutes the sensor mechanisms will be cleaned of dirt. Then the device is dried, and it can be safely installed in place. Before installation, check the distance from the needle to the body of the device (one should be 23 millimeters). Idle speed sensor VAZ 2110, 21214, the essence of the idle speed sensor and replacement. At this stage, the idle speed sensor of the VAZ 2115 can be considered successfully repaired. The machine can operate normally again.

So, we found out how the idle speed sensor of the VAZ 2114 (and other models) works. Idle speed sensor VAZ 2114, otherwise the sensor will need to be completely replaced. And how it can be replaced/restored.

Replacing an element

Signs of failure of the idle speed element are very similar to the failure of the throttle position sensor, only in this case the “Check engine” display does not flash on the instrument panel. The car does not start well when cold, is unstable at idle and may stall when coasting. The regulator cannot be repaired; it only needs to be replaced.

The element is replaced in the following order:

Disconnect all pipes from the throttle body, unscrew and remove this unit. Without this, dismantling the regulator is impossible.
The element in the form of a barrel with a flange is screwed to the body with 2 screws. Unscrew them and pull out the regulator without losing the gasket.
Measure the length of the rod on the new element, starting from the flange of the part; it should not exceed 23 mm. If the rod is longer, then you need to retract it, briefly applying a voltage of 12 V to the contacts marked “D” and “C”.
Wipe the seat with a rag to remove dirt, lubricate the gasket with motor lubricant and install the new regulator in place.

Replacement.

To remove the DS, you need to place the car on a level surface. After this, it is best to disconnect the battery terminals to avoid errors in the BC.

Also interesting: Engine tuning: Niva 4x4 - increasing power using common methods

Disconnect the wire terminals; to do this, press the plastic lock on the block. After this, use a wrench to unscrew the sensor from its seat. If you cannot unscrew it immediately, it is not recommended to use excessive force. You need to treat the threaded connection with WD-40, wait a few minutes and continue dismantling.

Installation of a new DS is carried out in the reverse order. When purchasing a new part, you need to pay attention to the external condition: the contacts must be treated with a sufficient amount of varnish, as this protects them from moisture. After completing the work, it is necessary to reset the on-board computer errors in order to remove the CHECK ENGINE error.

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Replacing an element

The element is replaced in the following order:

Disconnect all pipes from the throttle body, unscrew and remove this unit. Without this, dismantling the regulator is impossible.
The element in the form of a barrel with a flange is screwed to the body with 2 screws. Unscrew them and pull out the regulator without losing the gasket.
Measure the length of the rod on the new element, starting from the flange of the part; it should not exceed 23 mm. If the rod is longer, then you need to retract it, briefly applying a voltage of 12 V to the contacts marked “D” and “C”.
Wipe the seat with a rag to remove dirt, lubricate the gasket with motor lubricant and install the new regulator in place.

After replacement, you need to install the throttle valve assembly back, connect the pipes and start the engine to check.