3315707 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - Functional description (Right hand drive, Automatic transmission)
Functional description
The engine control unit
M10
monitors
and controls the entire electronic ignition and injection system.
The control unit is supplied directly by
the battery via a line protected by maxifuse CENTR of
B5
at pin 4 of connector B of
M10
via fuse
F20
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 an ignition-operated
signal (INT/A) from the line protected by the fuse F16 of the junction
unit B1; the main relay J10 consequently sends a supply:
- to pin 2 of connector A of control unit M10 ;
- to injectors N70 ;
- to the coils A30 ;
- to timing sensor K47 , via a line protected by
fuse B40.
- to air flow meter K41 , via a line protected by
fuse B40 ;
- to the vapour recovery solenoid valve L10 , via
the line protected by fuse B40 ;
- to the Lambda sensor heater K40 , via the line
protected by fuse B40 ;
The ignition-operated power supply (INT/A)
also supplies fuel pump relay
J15
, which is excited by a
control signal (earth) from pin 29 of connector C of control unit
M10
.
This supplies power - via fuse
F3
of junction unit
B1
to fuel pump
N40
, which is earthed through
inertia switch
I50
, which cuts off the circuit in the case
of impact to prevent the danger of fuel flowing out.
Pins 3, 7 and 8 of connector A of control
unit
M10
are earthed and used as references: the first two
for the ignition and the third for the injectors.
Pin 8 of connector
F
is also earthed.
The engine control unit
M10
receives
signals from the various sensors in order to monitor all engine
service conditions.
Rpm sensor
K46
supplies information
on engine speed via a frequency signal sent to pins 37 and 38 of
connector E of control unit
M10
.
Timing sensor
K47
receives a reference
earth from pin 39 of connector
E
of control unit
M10
and sends back a frequency signal corresponding to the timing to
pin 40 of the same connector.
Engine temperature sender unit
K36
receives a reference earth from connector
E
of control unit
M10
and supplies a signal proportional to the coolant temperature to
pin 29 of control unit connector
E
. 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 32 of control unit
connector
C
, while pin 31 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 the heating signal from pin 5 of
connector A of
M10
.
Knock sensors
K50
and
K51
provide information on knock status via frequency signals sent to
pins 42 and 44 respectively of control unit connector
E
.
An earth signal is sent from pins 41 and 43 of connector
E
of
M10
respectively.
Air flow meter
K41
(supplied by
relay
J10
) receives a reference voltage from pin 46 of connector
E
and sends to pin 47 of the same connector a signal proportional
to air flow.
K41 also contains an air temperature sensor:
the sensor reference earth is supplied by pin 48 of connector
E
of
M10
, while pin 45 of connector
E
receives an
air temperature signal.
Accelerator pedal
K55 is fitted with
two built-in potentiometers (a main one and a safety back-up).
The first receives power and earth from pins 22 and 23 respectively
of connector C of
M10
and sends a corresponding signal to
pin 24 of the same connector. The second receives power and earth
from pins 27 and 26 respectively of connector C of
M10
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