2429916 - E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT - Functional description
Functional description
The engine control unit
M10
monitors
and controls the entire electronic injection system.
The supply controlled by the ignition (15/54)
reaches pin 23 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; the supply line is protected by fuse
F18 of B1; it is energized by a control signal (earth) coming from
pin 80 of the control unit M10, and thus sends a supply:
- to pin 5 of connector A of the actual control unit, via
the line from fuse F17 of B1;
- to pins 4 and 6 of connector A of the unit, via the line
protected by fuse F22 of B1;
- to the air flow meter K41, to the solenoid valves L30
and to the control unit M15 via the line from fuse F11 of B1
The fuel pump relay T10 of
B1
is
supplied by the line of the fuse F21 of
B1
.
It is energized by a control signal (earth)
from pin 75 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.
Pins 1, 2 and 3 of connector A of
M10
are earthed.
The diesel pre-heating relay T19 of
B1
is
supplied by the line for fuse F20 of
B1
.
It is energized by a control signal (earth)
coming from pin 76 of connector A of the control unit
M10 and
supplies power to the diesel heating resistance located in K100.
Control unit
M15, responsible for controlling
preheating of heater plugs A40, is supplied directly by the battery
via a line protected by shunt fuse B37.
It is supplied, connector
C, by the line for fuse
F11 of B1 and exchanges command and control
signals with pins 24 and 70 of connector A of M10 which controls
the timing.
Connector B is connected to the heater plugs
A40.
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 43 and 59 of connector
B of control unit M10.
Timing sensor
K47 is supplied from pin
21 of connector B of control unit M10.
It receives a reference
earth from pin 56 of connector B of control unit
M10 and sends
it a signal of frequency corresponding to the timing of pin 25 of
the same connector.
The engine temperature sensor
K36
,
receives a reference earth from pin 29 of the control unit
M10
and
supplies a signal proportional to the temperature of the engine
coolant to pin 54 of connector B.
The air flow meter
K41
receives a
general supply from the line for fuse
F11
of
B1
and
a reference earth from pin 27 of connector B of
M10
. It
is supplied by the control unit from pin 14 of connector B of
M10,
and sends pin 40 of connector B a signal proportional to the air
flow.
There is also an air temperature sensor inside
K41
which sends an air temperature signal to pin 10 of connector B of
M10.
Accelerator pedal K55 is fitted with two
built-in potentiometers (a main one and a safety back-up). The former
receives power and earth from pins 35 and 83 respectively of connector
A of
M10 and sends a corresponding signal to pin 65.
The
latter receives a supply and earth from pins 15 and 32 of connector
A of
M10, respectively and sends the signal to pin 41.
The fuel temperature sensor
K100 measures
the temperature of the diesel entering.
It receives a reference
earth from pin 13 of connector A of
M10 and sends the fuel temperature
signal to pin 611.
The supercharging sensor
K82 measures
the pressure and temperature in the intake chamber, downstream of
the turbocharger.
It is supplied from pin 24 of connector B
of
M10 and receives a reference earth from pin 23 of connector
B.
The signal corresponding to the pressure value is sent to
pin 41 of connector B of the control unit.
The fuel pressure sensor
K83
is responsible
for providing the injection control unit with a feedback signal
for governing pressure and injection duration. It receives power
and a reference earth from pins 38 and 6 respectively of connector
B of
M10;
it then sends the pressure signal to pin 8.
The control unit
M10 receives the signal
for the minimum engine oil pressure sensor K30 at pin 9 of connector
B.
Pin 92 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 68 of
M10 receives the 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 93 of
M10 receives the signal coming
from the clutch switch I31 (or, on versions with a robotized gearbox,
from the starting enablement switch on the brake pedal I34).
The water in diesel filter sensor
K31
;
is supplied by the line controlled by the ignition (INT) for fuse
F35 of
B2
and sends the corresponding signal to pin 90 of
connector A of
M10
.
The fuel pressure regulator
N77
has
the task of keeping the value of the fuel pressure in the accumulator
constant. The two control signals come from pins 4 and 34 of connector B
of the control unit
M10.
The EGR solenoid
L30
controls exhaust
gas recirculation. it is supplied by the line for fuse F11 of
B1
and is controlled by a signal for pin 15 of connector B of M10.
The injectors
N70 are connected to the
engine management control unit from pins 47-16, 49-17, 48-31, 46-1
for cylinders 1, 2, 3 and 4, respectively.The control unit M10 is connected
via the CAN network 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;
- heater plugs pre-heating, which is sent to the instrument
panel E50 which manages the appropriate warning light;
- water in diesel filter, which is sent to the instrument
panel E50 which manages the display;
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 78 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
and any faults in the engine temperature sensor, oil pressure sensor
and diesel filter 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 88 of connector A from the control unit M10 via
the specific tester line.