3239452 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - Functional description
Functional description
The engine control unit
M10
monitors
and controls the entire electronic ignition and injection system.
The direct supply for the system arrives
from the battery from the line for the EFI maxifuse of
B5
.
An ignition-operated power supply (15/54)
is received on a line protected by shunt fuse
B25
.
The control unit
M10
is supplied
directly by the battery at pin 18, via the line protected by fuse
B35
.
The supply controlled by the ignition, on
the other hand, arrives at pin 27, via the line protected by fuse
B25
.
The main relay J10 controls the entire
system: it is energized by an (earth) signal coming from pin 36
of control unit M10 and, as a result, sends a supply:
- to pin 37 of the control unit, via the line protected
by fuse B41 ;
- to the petrol pump relay J15 ;
- to injectors N70 ;
- to coils A30 ;
- to air flow meter K41 , via a line protected by
fuse B40 ;
- to the variable valve timing system J16 , via the
line protected by fuse B40 ;
- to fuel vapour recovery solenoid L10 , via a line
protected by fuse B40 ;
- to the idle actuator N74 , via the line protected
by fuse B40 ;
The fuel pump relay
J15
, supplied
by the main relay
J10
, is energized by an (earth) signal
coming from pin 3 of control unit
M10
.
This supplies power to the fuel pump
N40
,
which is earthed through the inertia switch
I50
, which cuts
off the circuit in the case of impact to prevent the danger of fuel
flowing out.
The relay
J15
also provides a supply
for the Lambda sensor heater
K40
via the line protected by
fuse
B36
.
Pins 2, 14, 19 and 24 of control unit
M10
are
earthed and act as a reference for the ignition, the injectors,
the electronic screening and the final power stages, respectively.
The engine control unit
M10
receives
signals from the various sensors in order to monitor all engine
operating parameters.
The rpm sensor
K46
provides information,
through a frequency signal sent to pins 48 and 49 of control unit
M10
,
concerning the engine speed: these two signals have an extremely
low intensity and are therefore suitable screened.
The timing sensor
K47
receives a
5 V supply from pin 12 of the control unit and sends a signal where
the frequency corresponds to the timing at pin 8 of the control
unit.: the low intensity of the signals requires them to be screened.
The butterfly position sensor
K56
is
supplied at 5 V from pin 12 and receives a reference earth from
pin 30; it sends, through a potentiometer, a signal proportional
to the degree of opening of the butterfly to pin 53 of
M10
.
The engine temperature sensor
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