Fiat 500 1.2 8v – STARTING AND RECHARING – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - STARTING AND RECHARING - Fiat 500 1.2 8v

IGNITION AND RECHARGING - WIRING DIAGRAM Fiat 500 1.2 8v

Components - STARTING AND RECHARING - Fiat 500 1.2 8v

Component code	Description	Reference to the operation
A001	BATTERY
A010	ALTERNATOR
A020	STARTER MOTOR
B001	JUNCTION UNIT
C002	BATTERY EARTH ON ENGINE	-
C003	BATTERY EARTH ON BODYSHELL	-
C015	DASHBOARD EARTH, DRIVER'S SIDE	-
D004	FRONT/ENGINE COUPLING	-
E050	INSTRUMENT PANEL
H001	IGNITION SWITCH
M001	BODY COMPUTER
M010	ENGINE MANAGEMENT ECU

COMPONENT LOCATION - STARTING AND RECHARING - Fiat 500 1.2 8v

IGNITION AND RECHARGING - COMPONENT LOCATION Fiat 500 1.2 8v

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Component code	Description	Reference to the operation
A001	BATTERY
A010	ALTERNATOR
A020	STARTER MOTOR
B001	JUNCTION UNIT
C002	BATTERY EARTH ON ENGINE	-
C003	BATTERY EARTH ON BODYSHELL	-
C015	DASHBOARD EARTH, DRIVER'S SIDE	-
D004	FRONT/ENGINE COUPLING	-
E050	INSTRUMENT PANEL
H001	IGNITION SWITCH
M001	BODY COMPUTER
M010	ENGINE MANAGEMENT ECU

DESCRIPTION - STARTING AND RECHARING - Fiat 500 1.2 8v

The ignition and recharging circuit comprises the battery, starter motor and alternator.The battery (12V) is low-maintenance.The starter motor consists of a d.c. motor supplied by the battery and an excitation electromagnet.When the ignition key is turned as far as it will go (AVV), the motor windings are supplied to generate the electromagnetic forces that are used to turn the starter motor pinion. This simultaneously activates the electromagnet that operates the mechanism, which 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, located on the back of the alternator, transforms the alternating current into direct current: this recharges the battery.A voltage regulator built into the alternator maintains the power supply at a constant voltage (around 14 V) throughout all load variation and engine speed ranges.The engine control unit and Body Computer monitor the efficiency of the recharging system:the engine management control unit receives the voltage signal from the alternator D+ terminal when the engine is moving;the Body Computer checks the efficiency of the alternator recharging system by detecting two parameters: the D+ signal and the rpm signal are both received via the CAN from the engine management control unit.The Body Computer also acquires the battery voltage value in the range 6 - 18 V.If insufficient voltage or a current generation system fault is detected, the associated warning light on the instrument panel is switched on.

FUNCTIONAL DESCRIPTION - STARTING AND RECHARING - Fiat 500 1.2 8v

On turning the key in the H001 ignition switch to the end position (AVV), the starter motor A020 (connector A) electromagnets winding (50) receive a power supply from pin 3 of connector A.The power direct from the battery arrives at ignition switch H001 (pin 2 of connector A) via the line protected by fuse F03 from the engine compartment junction unit B001 (pin 22 of connector B).The +30 pin (connector B) of starter motor A020 receives power via a terminal (connector D) positioned directly on the positive pole of battery A001.However, during the recharging phase, the direct current generated from alternator A010 is sent via the connector between connector B of the same alternator (B+) and connector C of starter motor A020, to battery A001 (connector D).Alternator A010, via pin 1 of connector A, supplies the insufficient recharging signal (D+) to pin 19 of connector A of the engine management control unit, allowing diagnosis of the alternator operation (in case of insufficient recharging level).This signal arrives via the C-CAN from control unit M010 (pins 50 and 49 of connector A) to Body Computer M001 (pins 44 and 45 of connector B) and is available to the network.Once a fault has been discovered, Body Computer M001, through the CAN, will light up the battery recharging/alternator fault warning light on instrument panel E050.Body Computer M001 receives power direct from the battery (pin 1 of connector A) protected by fuse F01 of engine compartment junction unit B001 (pin 18 of connector B); however, this is powered twice when the ignition is on (INT and INT/A), to pins 11 and 1 of connector E.Body Computer M001 is connected to driver-side dashboard earth C015 via pins 9 and 10 of connector E.