194001595 - E50010 STARTING AND RECHARGING - DESCRIPTION

The ignition and recharging circuit comprises the battery, starter motor and alternator.The starter motor consists of a d.c. motor supplied by the battery and an excitation electromagnet.The ignition system fitted to this car differs from traditional solutions adopted previously in the adoption of an ignition device (TEG Reader) combined with the steering lock control unit (NBS).According to the position of the key (TEG) in the ignition, the steering lock control unit determines: +15 power enablement request to thel Body Computer (ON position), vehicle ignition +50 (START position) and, if ignition is successful, power distribution to the vehicle and loads (INT, INT/A, 15/54).During start-up, the key must be turned to START position as the clutch pedal (or the brake pedal in recovery mode) is pressed simultaneously on versions with a manual gearbox, or the brake pedal for versions with an automatic transmission.On versions with an automatic transmission, the additional condition of having the gearlever in P (PARK) position must be respected.When the steering lock control unit is supplying a +50 power supply to the starter motor, the motor coils are supplied to generate electromagnetic forces that turn the motor pinion. This simultaneously activates the electromagnet that operates the mechanism that causes the pinion to mesh with the flywheel ring gear and thus turn the crankshaft.The alternator recharges the battery during normal engine rotation. The alternator shaft (rotor) is turned by the crankshaft via a belt. When supplied by an excitation current, the rotor generates a magnetic field that sets up an alternating current in the fixed winding (stator). A diode rectifier bridge at the back of the alternator allows the alternating current to be converted into a direct current that is sent to recharge the battery.A voltage governor, also built into the alternator, maintains the power supply at a constant voltage (14 V) throughout the load variation and engine speed ranges.For further details,    See descriptions 5520 ENGINE STARTINGThe efficiency of the recharging system is controlled by the Body Computer which measures the D+ signal coming from the alternator with the engine moving (revs above 700 rpm).If a fault is detected, the warning light in the instrument panel is lit up.The Body Computer also acquires a battery voltage reading in the range 6 - 18 V, according to a control logic known as “SBMT”.The information, sent to the door nodes via the CAN, cuts out certain services after a timed period of 15 minutes. For example,    See E2520 GLOVE COMPARTMENT LIGHT - LUGGAGE COMPARTMENT LIGHT - SUN VISOR LIGHT