Circuit Description

The aim of the MTIA (Main Throttle Idle Actuator) is to control the idle speed with the throttle body itself. The throttle is motorized for low opening angle (0,18°). The characteristics of the air flow are not the same for low and high opening angles. As a matter of fact, the gradient of the Mass Air Flow function of TP sensor is lower for small angles that permits to be more precise during the idle speed control. Out of idle speed the throttle is actuated mechanically by a classical bowdencable.

This switch indicates throttle plate in idle position when contact closed. This switch is fixed at the DC-motor drive and the throttle plate closes the contact in dependence to the actual motor drive position.