3026215 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - Functional description (103 CV)
Functional description
The engine control unit
M10
monitors
and controls the entire electronic ignition and injection system.
The system is supplied directly by the battery
via a line protected by the maxifuse CVM located on the battery,
connector
B99
.
The supply controlled by the ignition (15/54)
reaches pin 47 of connector A of
M10
from the line protected
by the fuse F16 of the engine compartment unit
B1.
The control unit
M10
is supplied
directly by the battery at pin 15 of connector A, via a line protected
by fuse F18 of the unit
B1
.
The main injection relay T9 of B1
controls the entire system: this is excited by a control signal
(earth) received from pin 31 of connector A of control unit M10
and then sends power:
- to pins 16, 32 and 48 of connector A of the unit, via
the line protected by fuse F17 of B1 ;
- to the air flow meter K41 , to the fuel vapour
recovery solenoid L10 and the Lambda sensors K15 and K17 ; (all these lines are protected by fuse F11 of B1 ;
- to the injectors N70 and the coils A30 ,
via the line protected by fuse F22 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 30 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
operating conditions.
Rpm sensor
K46
provides information
on engine speed via a frequency signal sent to pins 10 and 59 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 51 of connector B of control unit
M10
, receives a reference
earth from pin 26 of connector B and sends a signal of frequency
corresponding to the timing to pin 42 of control unit connector
B.
Engine temperature sender unit
K36
riceives a reference earth from pin 26 of connector B of control
unit
M10
and supplies a signal proportional to the coolant
temperature to pin 25 of control unit connector B.
The two Lambda sensors
K15
and
K17
provide the control unit
M10
information on the correct
composition of the air-fuel mixture in three different positions
of the exhaust: one upstream and the other downstream of the catalyzer.
The sensor
K15
upstream of the catalyzer
sends the signal to pin 23 of connector B of
M10
, while
pin 55 supplies the reference earth. Probe
K15
is heated
by a resistor in order to ensure it works efficiently even when
cold. The resistor is supplied by the main relay and receives an
earth signal from pin 34 of connector B of control unit
M10
.
The sensor
K17
downstream of the
catalyzer sends the signal to pin 28 of connector B of
M10
,
while pin 60 supplies the reference earth. The probe
K17
is heated with a resistor, supplied by the main relay, and receives
an earth signal from pin 50 of connector B of control unit
M10
.
Knock sensor
K50
provides information
on knock status via a frequency signal sent to pin 22 of connector
B of control unit
M10
. It receives a reference earth from
pin 54 of connector B. The signals are very low intensity and are
therefore shielded.
Air flow meter
K41
(supplied by
the relay
J10
) receives a reference voltage from pin 63 of
connector A of the control unit, and sends to pin 57 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 25 of connector A of
M10
, while an air temperature
signal is received by pin 54 of connector A.
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 56 and 24 respectively
of connector A of
M10
and sends a corresponding signal to
pin 8 of the same connector. The second receives power and earth
from pins 7 and 25 respectively of connector A of
M10
and
sends a corresponding signal to pin 40 of connector A.
Pin 274 of connector A of
M10
receives
the 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 50 of connector A of
M10
receives
the signal coming from the clutch switch
I31
.
Control unit
M10
controls the opening
of individual injectors
N70,
via duty cycle signals produced
by pins 19 (cyl. 1), 52 (cyl. 2), 35 (cyl. 3) and 3 (cyl. 4) of
connector B of
M10
.
The injectors
N70
receive a power
supply to enable the opening from the main relay
R9
.
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 16 and 14 of connector B for cylinder pair 1-4 and from pins
30 and 31 of connector B of
M10
for cylinders 2-3.
The coil
A30
primary windings receive
a signal to enable opening from the main relay.
Throttle body actuator
N75
is fitted
with two built-in potentiometers connected in parallel: they control
throttle opening via a stepper motor.
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