2429914 - 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 4 of connector A, via a line protected
by fuse F18 of the unit
B1
.
The supply controlled by the ignition (15/54)
reaches pin 17 of connector A of
M10 from the line protected
by fuse F16 of the engine compartment unit B1.The main injection relay T9 of B1
controls the entire system: this is excited by a control signal
(earth) received from pin 6 of connector A of control unit M10 and
then sends power:
- to the injectors N70 and the coils A30 ,
via the line protected by fuse F17 of B1 .
- to the fuel vapour recovery solenoid L10 and the
Lambda sensors K15 and K17 via a line protected by
fuse F11 of B1
- to the fuel pump N40 via the line protected by fuse
F22 of 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.
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 35 and 25 of connector
B of control unit M10: these two signals are very low intensity
and are therefore shielded, pin 34 of connector B of M10.
Timing sensor
K47 is supplied from pin
32 of connector B of control unit M10;
It receives a reference
earth from pin 20 of connector B and sends a frequency signal corresponding to
the timing to pin 24 of
M10.
The integrated air temperature sensor
K43
receives a reference earth from pin 29 of connector B;
it sends
a signal corresponding to the intake air temperature to pin 14 of
the control unit. A reference supply is sent from pin 22 of connector
B of
M10 to the sensor K43 which restores a signal, to pin 13,
proportional to the pressure of the intake air.
The throttle position sensor
K56 is supplied
from pin 32 of connector B of M10;
it receives a reference earth
from pin 20 fo connector B and sends a signal proportional to the
opening of the throttle to pin 3 of connector B of
M10.
The engine temperature sensor
K36
receives
a reference earth from pin 29 of connector B of the control unit
M10
and
supplies a signal proportional to the temperature of the engine coolant
to pin 5 of the control unit.
The detonation sensor
K50 provides information
concerning the onset of detonation in the combustion chamber through
frequency signals: it sends two signals to pins 6 and 15 of connector
B of M10;
these signals are also suitably shielded, pin 8 of
connector B of
M10.
The Lambda sensor at the pre-catalyzer
K15
and
the one at the catalyzer
K17
provide the control unit
M10
with
information concerning the correct composition of the air/fuel mixture:
The sensor
K15
sends a signal to
pin 22 of connector B of the control unit, whilst pin 32 provides
the reference earth: the intensity of these two signals is extremely
low and therefore they are appropriately shielded. Sensor
K15
is
heated by a resistor in order to ensure it works efficiently even
when cold; the resistance is supplied by the main relay
T9
;
pin 11 of connector B of
M10 provides the reference earth.
The sensor
K17 sends a signal to pin
31 of connector B of the control unit, whilst pin 21 provides the
reference earth: the intensity of these two signals is extremely
low and therefore they are appropriately shielded.
Probe
K17
is
heated by a resistor in order to ensure it works efficiently even
when cold; the resistance is supplied by the main relay
T9
;
pin 1 of connector B of
M10 provides the reference earth.
The control unit
M10
controls the
opening of the injectors
N70
via special signals sent from
pins 51, 18, 2 and 34 of connector B of
M10
. The injectors
N70
receive
a power supply to enable the opening from the main relay
T9
of
B1
.
The control unit
M10
also controls
the coil
A30
through the signals for the coil primary winding,
whilst the secondary winding sends a pulse to the spark plugs: from
pins 32, 16, 31, 15 of connector B of
M10
. The coil
A30
primary
windings receive a signal to enable opening from the main relay
T9
of
B1
.
The idle actuator
N74 regulates the throttle
by-pass line.
It is controlled by the control unit
M10
through
the signals from pins 17-19 and 9-18 of connector B of
M10
.
Fuel vapour recovery solenoid
L10
allows
fuel vapours to pass through to the engine intake where they join
the mixture entering the combustion chamber. Valve
L10
is supplied
by the main relay
T9
of
B1
; it is opened by the control
unit when the engine is loaded by a signal from pin 26 of connector
B of
M10.
The control unit
M10 receives the signal
for the minimum engine oil pressure sensor K30 at pin 23 of connector
B.The control unit M10 is connected
via the CAN network - pins 20 and 29 - to the Body Computer M1
and the other nodes on the network: through this connection, it
sends information concerning:
- system self-test, which can be used by connecting to connector
C of M1 .
- engine water temperature, which is sent to the instrument
panel E50 which manages the relevant gauge and warning light;
- rpm, which is sent to the rev counter of the instrument
panel E50 ;
- engine oil minimum pressure, which is sent to instrument
panel E50 which manages the relevant warning light;
It receives, via CAN, the speedometer signal
generated by the ABS control unit
M50
The self-test system of the control unit
M10
also generates a signal - which comes from pin 13 of connector A
- which is connected directly to the 'EOBD' warning light located in
the instrument panel E50.
The check function inside the instrument
panel
E50
also controls the intervention of the inertia switch,
any faults in the engine temperature sensor and the oil pressure
sensor: if faults are detected, the 'fault' warning light is switched
on.
The self-test data can be read by connecting
to connector C of the Body Computer
M1 - pin 7: it receives the
signals from pin 13 of connector A from the control unit M10 via
the specific tester line.