The main drawbacks of this system are loss of energy as well as restricted options for adapting to changing driving conditions. Magneti Marelli Introduces New ECU for MultiAir System By Alessandro Palazzi and Roberto Valacca, Magneti Marelli S.p.A., and Arnold Mayr, ETASĮTAS supports ECU software development process Engine cylinders are traditionally charged through the intake valves, with work cycles controlled by the rotating camshaft.