9000 L4-2290cc 2.3L DOHC Turbo EFI (1992)
In the LH 2. .4.2 system the idle air control valve has two windings and a reversible motor. The windings partially counteract each other so that a
voltage drop, such as caused by engagement of AC, does not affect control. The two windings also make for faster control.
In the event of a fault, a spring sets the valve in the Limp Home position. This position results in an engine speed of about 550 rpm when the valve is
not under load.
Adaptive idle air control system, LH 2.4, 2.4.1 and 2.4.2
In the adaptive (smart) idle air control system, adjustment / setting of idle speed takes place continuously and automatically compensates for all
normal changes.
The microprocessor in the control module "remembers" the opening the IAC valve had the last time the engine was running at idle speed. This system
reduces the need for service and the setting is maintained unchanged at a high level.
