900 Turbo Convertible L4-1985cc 2.0L DOHC Turbo EFI (1994)
Idle Air Control Valve: Description and Operation
Idling speed is controlled via a single-coil Idle Air Control (IAC) valve on the basis of a PWM voltage from the engine control module.
Automatic idle speed control is adaptive, i.e. it adapts continuously to changes that take place during the life of the engine. These may be wear in the
engine, dirt or leaks in the intake manifold or throttle body.
The control module is programmed to maintain a constant idling speed of 900 ± 50 rpm when the engine is warmed up at the same time as the throttle
position sensor indicates idling position.
Engine speed is compensated when AC is switched on and when a gear position other than P or N is selected on cars with automatic transmission.
The idling speed for the engine must be 90O ± 5O rpm.
