Engine start-up via starter motor
A20
is controlled by start-up enablement relay
J5
.
The relay is supplied from the battery via
terminal unit
A5
and start-up enablement MAXIFUSE
B9
.
Ignition switch
H1
receives battery
power via the line of maxifuse ACC of
B5
.
When the ignition key for the switch
H1
is turned to the extreme position (AVV) [START], if all the safety
conditions are followed, the relay
J5
is energized via the
diode
M11
which supplies the solenoid winding (pin 50) of
the starter motor
A20
.
The safety conditions are managed by the
engine management control unit
M10
which interfaces with
the gearbox sensor unit
D79
and control unit
M55
(see E7050 AUTOMATIC TRANSMISSION). When the safety conditions are
satisfied, the control unit
M10
sends the earth signal to
the coil for connector
J5
via pin 5 of connector A.
Pin 30 of
A20
, the actual starter
motor, is supplied with voltage directly from the battery via terminal
unit
A5
.
A start-up signal - pin 50 of
H1
is also directed to instrument panel
E50
- pin 13 of connector
A - whose internal software uses the information to set the system
to 'engine running' status. (see E4010 INSTRUMENT PANEL)
The start-up signal also reaches relay
R1
,
which supplies numerous ignition-operated lines (INT/A).(see also
E1010 FUEL SYSTEM).
The direct current generated by the alternator
A10
(pin B+) is sent to the battery
A1
through motor
A20
. When the alternator is not turning, i.e. not charging
the battery, an earth signal is sent from pin D+ to instrument
panel
E50
- pin 7 of connector A.
Instrument panel
E50
ingition-operated
power supply (INT/A) passes through fuse
F1
of junction
unit
B1
to pin 15 of connector A.
With the engine switched off but the panel
on (INT/A), the recharging warning light in the panel
E50
is on because there is an earth signal at pin D+ of the alternator
A10
.
When the engine has been started up and
the alternator is carrying out its recharging function, the warning
light goes out because pin D+ has a +12V signal.