ENGINE 1.3 QUADRAJET (75PS) 101 S. AIR CONDITIONING SYSTEM START OF OPERATION CHECK THE CONTROL UNIT OPERATES THE CLIMATE CONTROL COMPRESSOR : Q switching it on/off when the switch is pressed; Q switching it off momentarily (for a few seconds) in the case of strong acceleration or a request for maximum power. T. AUXILIARY FUEL PUMP CHECK Irrespective of the rpm, the control unit : Q supplies the auxiliary fuel pump with the ignition ON; Q cuts off the auxiliary pump supply if the engine is not started within a few seconds. U. CYLINDER POSITION CHECK During each revolution of the engine the control unit recognizes which cylinder is in the explosion stroke and controls the injection sequence at the appropriate cylinder. V. PILOT INJECTION AND MAIN INJECTION ADVANCE CHECK According to the signals coming from the various sensors, including the absolute pressure sensor integrated in the control unit it self, the latter determines the optimum injection point, according to an internal map, based on driving comfort and EURO 4 emission limits. W. INJECTION PRESSURE CLOSED CYCLE CHECK Depending on the engine load, determined by processing the signals coming from the various sensors, the control unit operates the regulator on the rail and the regulator on the pressure pump (for the 90 CV version only) to produce an optimum line pressure. X. ELECTRICAL BALANCE CHECK According to the battery voltage, the control unit alters the idle speed : Q increases the injector injection times; Q modulates the line pressure. Y. FAN CONTROL Depending on the temperature of the coolant and the pressure of the refrigerant fluid in the air conditioning system, the control unit controls : Q fan activation at first or second or third speed Z. CRUISE CONTROL SYSTEM CHECK (WHERE FITTED) Depending on the position of the control lever , the control unit directly controls the quantity of fuel injected to control and maint ain the vehicle speed memorized. A warning light on the dashboard activated by the control unit indicates system operation or deactivation status. The cruise control is temporarily disabled : Q by operating the brake; Q by operating the clutch; Q the resume button returns the stored speed. The cruise control is not disabled when the accelerator is pressed (e.g. to overt ake) and automatically restores the vehicle to the set speed as soon as the accelerator is released. The ASR function (antispin) takes precedence over cruise control for safety reasons
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