Idle speed control
Idling speed is controlled via a
singl~oil idle
air con-
trol
(IAC)
valve on the basis of a PWM voltage from
the electronic 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 changes may be wear in the
engine, dirt or leaks in the intake manifold or throttle
body.
The engine control module is programmed to main-
tain idling speed constant at 850
±
50 rpm when the
engine is warmed up at the same time as the throttle
position sensor indicates idle speed.
Engine speed compensation takes place when A/C
is switched on and when a gear position other than
P or N is selected on cars with automatic transmis-
.
sion.
Saab9000
Technical Description 23
I
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