Removal/refitting

The control of the r.p.m. at idle speed is carried out by an actuator which regulates the quantity of air taken in by the engine when the throttle valve is at the stop limit. This makes it possible to compensate the request for power by the various functions (air conditioning compressor, power steering, alternator etc.) so that the engine r.p.m. does not change.

A double electromagnetic circuit ensures that the commands for opening and closing are separate, an advantage with regard to the speed of regulation.

The actuator is also "self adapting" which enables it to follow and recognize the changes which are occurring in the engine (different degrees of internal attrition coupled to different temperatures, settling of the engine over a period of time etc.) so that the engine r.p.m. is kept constant under all running conditions.

In the event of a fault, a spring opens the actuator to an intermediate position so that the vehicle is able to reach a service station.

1. Rotating box
2. Connector
3. Counter spring
4. Armature
5. Permanent magnet

REMOVAL/REFITTING

• Disconnect the negative cable from the battery.

1. Disconnect the oil vapour recovery hose from the separator.
2. Withdraw the spark plug cables from the wiring clamps.

1. Disconnect the connections from the constant idle speed actuator.
2. Disconnect the constant idle speed actuator from the air intake pipe leading to the corrugated sleeve.
3. Unscrew the two retaining screws and remove the constant idle speed actuator.