Checking the idle speed controller VAZ 2114 can be performed either using an electronic multimeter, or using a homemade tester. Moreover, such a check is carried out both with its dismantling, and directly on the engine, without removing it. A multimeter is required for diagnostics.
To check the idle speed control of the VAZ, it is not necessary to remove it, but if an engine with a volume of 1.6 liters is installed on the car, then you must first unscrew the two mounting bolts that attach the throttle to the receiver and slightly move the throttle away from the receiver (by 1 … 1.5 cm). Then disconnect the chip with wires from the electrical contacts on the sensor.
Use a multimeter to check if power is supplied to the IAC. There are four terminals in the block - A, B, C and D (the terminals are marked on the block). It is necessary to check the terminals A and D for the presence of a voltage of 12 volts between them and the "ground". If there is 12 volts - check the windings, if not or the voltage is less - look for a problem with the electrician. There should be no voltage on pins B and C.
We "call" the windings using a multimeter connected to the ohmmeter mode. Resistance should be measured in pairs. Between terminals A and B, as well as C and D, the resistance value should be about 50 … 60 ohms. Next, you need to "ring" the conclusions A and C, as well as B and D. If the windings are in order, then they should not ring, that is, the resistance should tend to infinity or be a value of several megohms.
To check the operation of the needle, which is located at the end of the idle speed regulator, you first need to access it. To do this, you can dismantle the IAC or the entire throttle valve. At the same time, leave the block with wires connected to it to receive power from it.
With the ignition off, the needle (stem) is extended to the maximum of the body. Accordingly, when the ignition is turned on, it is in the extreme retracted position. Therefore, with the ignition on, you need to put your finger on the end of the IAC and turn off the ignition. It is necessary to act carefully so as not to lose the needle as a result of the "shot".
If the push from the needle is felt tactilely, the regulator is working properly. If there was no push, then most likely not, and additional checks need to be performed. Instead of dismantling the IAC itself, you can remove the throttle and turn the ignition on and off. So you can observe the stroke of the regulator stem, how far it goes and whether it sticks when moving.