3315706 - 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 control unit
M10
is supplied
directly by the battery at pin 18 of connector A, via the line protected
by maxifuse CENTR of
B5
protected by fuse
F20
of
junction unit
B1
.
An ignition-operated power supply (INT/A)
reaches pin 8 of connector A, via the line protected by fuse
F16
of junction unit
B1.The main fuel injection relay J10
controls the entire system: it is supplied directly from the battery
via the line of maxifuse B80; it is energized by a control signal
(earth) coming from pin 9 of connector A of control unit M10, and
thus sends a supply:
- to pins 7 and 17 of control unit connector A and injectors N70 via a line protected by fuse B41 ;
- the air flow meter K41 , fuel vapour recovery solenoid L10 , variable geometry control solenoid L15 , variable
valve timing actuator N76 and Lambda probe K40 ;
(all these lines are protected by fuse B40 ).
Fuel pump relay
J15
is supplied
directly from the battery via a line protected by maxifuse
B80
.
This is excited by a control signal (earth) from pin 3 of connector
A of control unit
M10
and supplies power to fuel pump
N40
via fuse
F3
of junction unit
B1
. The pump is earthed
via inertia switch
I50
. In case of impact, this cuts off
the circuit to prevent the danger of fuel delivery.
Fuel pump relay
J15
also supplies
power to ignition coils
A30
.
The engine control unit
M10
receives
signals from the various sensors in order to monitor all engine
service conditions.
Rpm sensor
K46
provides information
on engine speed via a frequency signal sent to pins 22 and 32 of
connector B of control unit
M10
. These two signals are very
low intensity and are therefore shielded.
Timing sensor
K47
is supplied from
pin 29 of connector B of control unit
M10
and sends a signal
of corresponding frequency to pin 23 of control unit connector B.
Engine temperature sender unit
K36
receives a reference earth from pin 1 of connector B of control
unit
M10
and supplies a signal proportional to the coolant
temperature to pin 5 of control unit connector B. The same sender
unit also supplies information to the temperature gauge and warning
light (
See E4010 INSTRUMENT PANEL
).
Hot Lambda probe
K40
provides control
unit
M10
with information on the correct composition of
the air-fuel mixture. The signal is sent to pin 30 of connector
B of
M10
, while pin 21 provides a reference earth signal.
Probe
K40
is heated by a resistor in order to ensure it
works efficiently even when cold. The resistor is supplied by the
relay
J10
and receives an earth signal from pin 8 of connector
B of control unit
M10
.
Knock sensor
K50
provides information
on knock status via a frequency signal sent to pin 2 of connector
B of control unit
M10
. It receives a reference earth from
pin 11 of connector B. The signals are very low intensity and are
therefore shielded.
The air flow meter
K41
(supplied
by the relay
J10
) receives a reference voltage from pin 1
of connector A of the control unit, and sends to pin 20 of connector
A a signal proportional to the air flow.
K41 also contains an
air temperature sensor: the sensor reference earth is supplied by
pin 29 of connector A of M10, while an air temperature signal is received
by pin 30 of connector A.
Control unit
M10
controls the opening
of individual injectors
N70
via duty cycle signals produced
by pins 6 (cyl. 1), 17 (cyl. 2), 16 (cyl. 3) and 7 (cyl. 4) of connector
B of
M10
.
The injectors
N70
receive a power
supply to enable opening from main relay
J10
.
Control unit
M10
also controls coils
A30
via control signals (earth) for the coil primary windings,
while the secondary winding sends a pulse to the spark plugs: from
pins 38 and 10 of connector B for the cylinder pair 1-4 and from
pins 9 and 37 of connector B of
M10
for cylinders 2-3.
The coil
A30
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