16A-2V1 MR-372-J84-16A000$010.mif
16A
Scénic II ph 2
•Battery
The principal purpose of the battery is to provide the powerful current briefly required by the starter motor to start the
engine. For optimum starting, the current supplied by the battery must be sent to the starter motor with minimum
loss. To achieve this, the electrical connections (wires, terminals, connectors, etc.) must be in good condition.
When the engine is not running, the battery must feed the accessories that operate constantly, even with the ignition
switched off, such as the alarm, radio codes, computers, etc.
•Starter
This turns the engine over to make it start, and requires a very powerful electric current, which the battery must be
able to supply.
•Alternator
The alternator only operates when the engine is running. Its function is to recharge the battery, and at the same time
to supply the electrical power required to operate all the electrical accessories on the vehicle.
The alternator on Mégane II phase 2 is a controlled alternator. The UPC* controls the regulation via a serial
connection.
•Engine Compartment Connection Unit or Protection and Switching Unit
The UPC* is connected to the alternator by a serial connection. The UPC* intelligently manages the alternator
regulation voltage according to the engine phase, the battery charge, and the temperature.
•The UCH
The UCH* interprets the starting request and analyses if the starting conditions are satisfied, in order to transmit the
request to the UPC*.
*UPC: Engine Compartment Connection Unit or Protection and Switching Unit
*UCH: Passenger Compartment Central Unit
STARTING - CHARGING
Fault finding – Role of components
