WIRING DIAGRAM - STARTING AND RECHARING - 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
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:
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.