Throttle Position Switch: Description and Operation

Throttle position switch





The throttle body is bolted to the inlet manifold and accommodates the throttle butterfly, the idling air passage with idling adjustment screw, connections for the auxiliary air valve hoses and an outlet for the vacuum control unit on the distributor.

The throttle position switch is screwed to the throttle body and consists of a casing incorporating a terminal for the connection of the built-in contacts which send signals on the position of the throttle butterfly to the control module.

Inside the casing is a cam plate that is linked to the throttle butterfly spindle and acts on the contacts.

On idling, the throttle butterfly is in the position for idling and the idling contacts are closed by the actuator.

At full throttle, the butterfly is in the full throttle p0sition and the cam plate closes the full throttle contacts and the engine receives extra full-load fuel enrichment.