An electronic control system supervises and governs all engine parameters to optimise performance and fuel consumption by means of a real-time response to different service conditions.The Diesel engine is equipped with the latest version Common Rail Unijet type injection system which has new solutions for further improving general behaviour.This features the use of an electronically controlled high injection pressure. The supply of fuel, known as the pilot injection, is optimized by the electronic control unit by means of the injector rather than managed by the pump.The common rail injection system on this version uses Multijet technology: i.e. during each engine stroke, it carries out more than the two injections normally used: it performs two pre-injections (before the piston is at top dead centre), one main and two post-injections.This solution improves fuel consumption, noise levels and performance because it allows better control of temperature in the combustion chamber by lowering the maximum value and extending the optimum combustion area.The combustion chamber has been improved to increase thermodynamic efficiency reducing the compression ratio to 18:1. The supercharging is carried out by a fixed geometry turbocharger equipped with a Waste Gate valve.The adoption of an electrically activated EGR valve, managed directly by the engine management system, the use of a cooling system for the recirculated exhaust gases and the close coupled type catalytic converter make it possible to ensure that the emissions are within the new EURO 4 limits.The intake manifold with variable swirl involves the adoption of a throttle on one of the two intake duct for each cylinder. This makes it possible to ensure the optimum vortex movement of the mass of air inside the combustion chamber depending on the engine operating conditinos allowing the possibility of recirculating a greater amount of EGR without penalizing particle emissions.Depending on the signals received from numerous sensors, the control unit controls the injectors connected to it managing the following systems:- fuel supply;- air supply;- heater plugs;- accelerator pedal;- engine cooling;- fuel pre-heating;- combustion control;- particle filter (DPF).The electronic management system described above ensures that this engine meets the very latest EOBD (European On Board Diagnogis) system emission control and monitoring requirements. This system allows continous diagnosis of emission-related car components and notifies the driver if any of the components should deteriorate by turning on a warning light in the instrument panel.The aim of the system is to:- monitor system efficiency;- indicate an increase in emissions due to vehicle malfunction;- indicate the need to replace damaged components.The system is also controlled by dedicated relays in the engine bay control unit. Lines supplying the control unit and various system components (sensors and actuators) are protected by dedicated fuses that are also located inside the engine bay.