Tridon Idle Air Control Valve TAC049

The idle air control valve, sometimes known as an IAC, is an electrical actuating device designed to electromechanically control engine idle speed. It is an essential part of the vehicle engine management system, integrated into a bypass housing or located on or near the throttle body assembly. The idle air control valve allows a measured amount of air to bypass the throttle plate/butterfly when it is closed, enabling the ECU to accurately control the idle speed of the vehicle’s engine.

The IAC position is adjusted quickly to compensate for engine load and is commonly required for or during engine start-up, cold start/engine warm up, additional electrical loads, deceleration, air conditioning and automatic transmission use. It is controlled by an input signal from the ECU as required by the engine management system; the duration and frequency of the ECU input signal determines how long and how far the IAC valve opens, hence the amount of air that is allowed to bypass the throttle plate.

The idle air control valve must be compatible with the vehicle engine management system.