How to check the idle speed regulator. Signs of breakdown and typical malfunctions

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The idle speed controller is one of the main mechanisms in the control system of any injection engine. The stability of the engine at idle depends on how correctly it works. Also, fuel consumption and sudden stops of the internal combustion engine depend on the IAC. Let's see how this regulator sensor works and how to check the idle speed regulator if it is faulty. Breakdowns happen quite often. And its resource is small due to the fact that it is constantly in operation.

Where is the IAC, its functions

This device is necessary to solve the four main functions. The primary task is to maintain a certain number of idle speeds. Also, the regulator provides engine start in cold weather. The device is able to increase the speed for accelerated warm-up. As the antifreeze in the engine heats up, the warm-up speedare gradually falling. If this does not happen, then this indicates a breakdown of the sensor. You need to understand how to check the idle speed control.

The IAC also maintains the minimum idle speed when the gas pedal is released. IAC is responsible for creating a mixture of fuel with air with the correct stoichiometry. This ensures optimal fuel consumption and stable engine operation. You can find the idle speed controller on the throttle assembly. On most gasoline engines, it is located near the throttle position sensor.

Design and principle of operation

Before you check the idle speed regulator, you need to at least approximately know how this device works and on what principle it works.

There are two schemes according to which this device works. The first scheme is direct throttle adjustment. The second is throttle idle bypass capacity control.

On most engines, stepper motors are used as an IAC actuator. They have many advantages over other types of drives. This is increased accuracy, low current consumption, the ability to control operation in a pulsed mode.

When the throttle is fully closed, the engine can maintain idle speed by partially supplying fuel through the XX bypass. The IAC is equipped with a locking needle that moves according to commands from the ECU. Moving, needleadjusts the width of the channel for air intake, the amount of which determines the idling.

For each type of internal combustion engine, the manufacturer sets the optimal speed at the twentieth. The range is from 600 to 1000 rpm.

IACs, which directly control the throttle, leave a small gap for a minimum amount of air to enter the engine intake manifold. This ensures that idle speed is maintained. When you press the gas pedal, the IAC turns off and remains in the position in which it was before pressing the pedal. This reduces the load on the mechanism drive.

Signs of malfunction

The first symptom is an unstable idling of the engine. This can be easily heard. Changes in speed will be clearly audible. In addition, the engine will definitely vibrate during such operation.

When the driver shifts into neutral, the engine immediately stalls. This can often be seen in front of traffic lights. Also, a malfunction of the IAC can be judged by unstable revolutions.

How else is the idle speed regulator 2110 checked? It also happens that immediately after starting the engine, it does not work at high speeds. When you press the accelerator pedal, there is no reaction from the engine. You can also think about replacing the regulator when the engine speed drops when you turn on electrical appliances.

Such malfunctions can be singly or in combination. But when they appear all at once, it speaks ofrunning situation. The owner of the car should know how to check the idle speed controller, because the device can fail at any time.

Causes of malfunctions of IAC

Regardless of what caused the sensor to fail, it is not worth delaying the time for diagnosis and replacement. Failure of the IAC greatly affects the operation of the motor. Among the reasons are the wear of the needle guides, as well as a break inside the sensor.

Typical breakdowns

To know how to check the VAZ idle speed controller, you need to navigate the typical malfunctions for this device.

Among the common problems are wiring problems - for example, power failure often occurs. The electrical contacts in the sensor connectors may oxidize. The problem is exacerbated by the fact that it is difficult to diagnose due to unreliable connections. The malfunction may occur only occasionally.

Another typical failure for this device is a stepper motor. The reason for the malfunction is its pollution. Basically, the stem suffers, sometimes the sealing ring is destroyed. Sometimes during the diagnosis, wear of the rod itself is detected. Contamination is visible visually - just remove and inspect the device.

How to quickly identify a breakdown?

The operation of the IAC is not directly related to the electronic control unit in the car. The engine ECU sets only the IAC rod extension. A certain current is supplied to the stepper motor. But the electronics can't tell what position it's in.stock - values are not fixed. If there is a problem with the IAC, the "Check Engine" light will come on.

How to check the idle speed controller VAZ-2114 using a diagnostic scanner? By connecting it, you need to count the errors. Typical ones include:

• P0505 - Malfunction in the control circuit.
• P0506 - sensor blocking.
• P1509 - circuit overload.
• P1513 - Short circuit in control circuit.
• P1514 - break.

Checking IAC with a multimeter

Unlike a scanner, a multimeter is much more efficient in this case. This method involves measuring the current at the sensor connector. If there is no power when the ignition is on, then a break can be stated. Also check the voltage on the stator winding. Let's see how to check the idle speed regulator with a multimeter, since a stepper motor has two windings and is easy to make a mistake.

First of all, check if the voltage is on the sensor. The probes touch the contacts "A" and "B", and then "C" and "D" in resistance mode - the tester should show approximately 53 ohms. Further, the same is done with the pairs "B" and "D" and "A" and "C". Here the resistance should move towards infinity. Otherwise, the sensor is defective and needs to be replaced.