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Idle speed control

Idle speed control


Idling speed is controlled via a single-coil idle air control (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 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 B204L engine must be 900±50 rpm.