The idle speed controller maintains the set idle speed of the engine at wide throttle during start-up, warm-up and when the load changes when auxiliary equipment is turned on
The regulator changes the amount of additional air supplied to the intake system in addition to the throttle, and is an electromechanical valve attached with two bolts to the flange of the throttle body,
The regulator valve seat and channels made in the flange of the throttle assembly form an additional air supply system, bypassing the throttle valve.
The engine control unit, having processed the signals from the sensors, determines the need to open the valve (Fig. 1) of the regulator and transmits impulses to the plug output of the regulator stator winding.
With each control pulse, the rotor rotates through a certain angle, moving the valve relative to the seat with the lead screw.
Additional air enters the intake pipe through channels in the throttle assembly.
Determining the vacuum in the engine intake pipe, the control unit seeks to maintain it at a given level by periodically opening and closing the idle air control valve.
This makes it possible to supply a constant amount of additional air to maintain a constant idle speed.
By changing the opening and closing of the regulator valve, the control unit compensates for a significant increase or decrease in the amount of air supplied, caused by its suction through a leaky intake system or, conversely, by a clogged air filter.
The inclusion of additional units causes an increase in engine load, accompanied by a decrease in the idling speed and a change in the vacuum in the intake pipe, which is also compensated by the control unit using the regulator.
Replacing the idle speed control
The idle speed control is located at the bottom of the throttle assembly. It consists of a two-pole stepper motor and a cone valve connected to it.
At the signal of the ECU, the electric motor moves the valve, thereby changing the flow area of the air channel.
You will need a TORX T20 key.
Remove the air filter (see Removing and installing the air filter).
Disconnect the wiring harness connector from the regulator (ignition off).
Remove the two screws securing the idle speed controller to the throttle assembly (shown on the removed throttle assembly for clarity)
Remove the regulator and its O-ring.
Replace a damaged or loose ring with a new one.
Install the regulator in the reverse order of removal.