SMART Series 451 Service Manual page 22

SN_Typ 451_us.book Seite 21 Freitag, 30. November 2007 1:56 13
Alternator
The alternator supplies the electrical consumers
while the engine is running and recharges the battery
so that a subsequent engine start is possible.
The alternator is equipped with an overvoltage
protection function that limits the on-board power
supply voltage in the event of a defect in the
governor. The alternator is monitored by the ME-SFI
[ME] control unit.
The alternator is pre-excited via a direct line. The
alternator load is reported back to the ME-SFI [ME]
control unit over a separate line and monitored.
G2 Alternator
On-board electrical system/power supply
Instrument cluster
The on-board power supply voltage is monitored by
the engine control. If the voltage is < 11.5 V for a
period of over 3 min, a signal is sent over CAN to the
instrument cluster and the alternator charge moni-
toring and warning lamp (A1e5) lights up.
P54.10-2891-00
A1
A1e5
Introduction of the smart fortwo, Model Series 451
Instrument cluster
Alternator charge monitoring and warning lamp
P54.32-5684-00
21