2401163 - 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 fuse F18 of engine bay control unit
B1
.
The supply controlled by the ignition (15/54)
reaches pin 51 of connector A of
M10
from the line protected
by fuse F16 of the engine compartment unit
B1
.
Connector C of
M10 is earthed. The main injection relay T9 of B1
controls the entire system: this is excited by a control signal
(earth) received from pin 19 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 F22 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 pins 17, 33 and 49 of control unit M10, via the
line protected by fuse F17 of B1;
The fuel pump relay
T10 of B1 is supplied
from the line of fuse F21 of B1.
It is energized by a control signal (earth)
from pin 62 of connector A of control unit
M10
and supplies
power to fuel pump
N40
, which is earthed through the inertia
switch
I50
, which cuts off the circuit in the case of a
crash and so prevents the dangerous spilling of fuel.
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 10 and 42 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
7 of connector B of control unit M10.
It receives a reference
earth from pin 9 of connector B and sends a frequency signal corresponding to
the timing to pin 36 of
M10
.
The integrated air temperature sensor
K43
receives a reference earth from pin 26 of connector B; it sends
a signal corresponding to the intake air temperature to pin 55 of
the control unit. From pin 7 of
M10
a reference supply is
sent to the sensor
K43
which restores a signal, to pin 6,
proportional to the pressure of the intake air.
Engine temperature sender unit
K36
receives
a reference earth from pin 9 of connector B of control unit
M10
and supplies a signal proportional to coolant temperature to pin
38 of the same connector.
The detonation sensor
K50
provides
information concerning the onset of detonation in the combustion
chamber through frequency signals: it sends two signals to pins
21 and 37 of connector B of
M10
; these signals are also
suitably shielded.
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 8 of connector B of the control unit, whilst pin 25 provides
a 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 49 of connector B of
M10
provides the reference earth.
The sensor
K17
sends a signal to
pin 57 of connector B of the control unit, whlst pin 41 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 17 of connector B of
M10
provides the reference earth.
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 21 and 22 respectively of connector
A of
M10
and sends a corresponding signal to pin 54 of
the same connector. The second receives power and earth from pins
5 and 4 respectively of connector A of
M10
and sends a corresponding
signal to pin 37 of connector A.
Pin 25 of connector A of
M10 receives
an N.A. positive signal coming from the brake lights switch I30,
with the supply controlled by the ignition (INT) from fuse F37 of
the junction unit B2.
Pin 57 of connector A of
M10 receives
an N.C. positive signal coming from the brake lights switch I30,
with the supply controlled by the ignition (INT) from fuse F35 of
the junction unit B2.
Pin 7 of connector A of
M10 receives
a negative signal coming from the clutch switch I31.
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
.
Throttle body actuator
N75
is fitted
with two built-in potentiometers connected in parallel: they control
throttle opening via a stepper motor.
The motor receives power from pins 11-43
and 28-60 of connector B of
M10
. Pin 56 of connector B sends
a power supply to both potentiometers, pin 58 supplies an earth
signal to the potentiometers, while pins 39 and 23 of the same connector
receive signals from the throttle body actuator
N75
.
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
33 of connector B of
M10
.
The control unit
M10 receives - at pin
42 of connector A - a negative signal for the minimum engine oil
pressure sensor K30.
The engine coolant temperature control unit
M10
which is sent to the instrument panel E50 which manages the gauge
and the engine rpm warning light, which is sent to the rev counter
from the instrument panel E50; miinimum engine oil pressure, which
is sent to the instrument panel E50 which manages the 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 negative signal - which comes from pin 31 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 and, at the same time, the information is shown on the display.
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 2 of connector A from the control unit M10 via
the specific tester line.