Automatic Idling Control (AIC)

Because the mass of air that the AIC valve admitted through the throttle housing to compensate idling speed for A/C cut-in etc. varies depending on pressure and temperature, the compensation it provides also tends to vary to some extent with ambient conditions.
However, because the AIC function in the ETS is adaptive, continuous compensation related to pressure and temperature takes place, which means that the opening duration and throttle angle will always be exactly right to admit the precise mass of air required for correct idling speed compensation. This means that ETS compensates for cut-in of power consumers not just on idling but throughout the engine speed range (except at full throttle).