ENGINE 1.3L QUADRAJET (90PS) 98 3A.1.8 ENGINE MANAGEMENT SYSTEM 3A.1.8.1 SYSTEMOVERVIEW An electronic control system supervises and governs al l engine parameters to opt imise performance and fuel consumption by means of a real-time response to different service conditions. Diesel engines are equipped with a COMMON RAIL type injection system. 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. In this 4 valve per cylinder version, the common rail injection system uses Multijet technology: i.e. during each engine stroke, it carries out more than the two injections normally used: it performs two preinjections (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. Depending on the signals received from numerous sensors, the control unit controls the injectors connected to it managing the following systems : Q fuel supply; Q air supply; Q heater plugs; Q accelerator pedal; Q engine cooling; Q fuel pre-heating; Q Emission control (lambda sensor). 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. 3A.1.8.2 FUNCTIONAL DESCRIPTION This section contains the circuit layout functions of the various components involved in engine management system. This information gives an idea on the working of this system.
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