C78 ENT M50
DIAGNOSTICS
3
FEBRUARY 2003 EDITION
Recovery
Associated to the detection of significant or severe faults,
the ECU adopts strategies that, to allow safe use of the
engine, limit some injection parameters within pre-set
thresholds according to the severity of the situation.
As a result of these strategies, the engine’s maximum power
output is reduced. In case of intermittent faults, i.e. faults
that are detected by the ECU and subsequently are no
longer present, performance reduction will be active until
the engine is shut down.
Normal operation will be restored only at the subsequent
start-up, while the fault data will be “saved” in the fault
memory.
Fault Indicator Light
The ECU continuously monitors its own operating condi-
tions as well as those of the components connected to it
and of the engine itself, with complex self-diagnostics rou-
tines. If faults are detected, the fault indicator light on the
indications and control panel is lit in ways that provide an
initial indication of the severity of the problem.
Light off:
no fault detected or minor fault that does
not compromise operating safety.
Light on:
significant fault, allowing to proceed to a diag-
nostics center.
Blinking light:
severe fault, requiring immediate servicing.
If circumstances allow shutting the engine
down.
Blink code
The emission of the fault codes detected by the self-diag-
nostics routines and stored in the ECU starts after the
push-button located on the relay and fuse board is pressed
and released. The LED to the side of the push-button and
the EDC indicator light on the indications and control panel
will simultaneously signal the codes by blinking two series of
emissions at different frequency, reproducing the digits indi-
cating the fault with decimal numbering.
Slow blinking
indicates the area of the fault (engine, injec-
tors, …),
fast blinking
indicates a specific fault.
Every time the push-button is pressed and released, only
one of the stored codes is emitted; therefore, the proce-
dure needs to be repeated until the system emits the same
error data as the first one: this will mean that the entire fault
memory has been analyzed.
If no anomalies are stored, the light comes on when the
push-button is pressed and comes off about 1 second after
it is released, without blinking.
Note:The blink code diagnostic procedure provides indica-
tions about faults that are currently present but also about
other faults, which arose in the past and are no longer pre-
sent at the time of the diagnostic procedure.Therefore, it is
absolutely necessary, at the end of each servicing operation,
to reset the error memory to prevent the system from sig-
naling faults, in the future, whose cause has already been
removed.
Fault memory reset
In current applications, the reset operation is carried out
keeping the blink code push-button pressed down with the
key switch in the OFF position and keeping it pressed for 5
more seconds are setting the switch to ON. Confirmation
of the reset will be obtained by turning the key switch from
OFF to ON and requesting blink codes again: at that point,
no codes should be produced.
ECU BEHAVIOR
Summary of Contents for C78 ENT M50
Page 1: ...C78 ENT M50 MARINE ENGINE INSTALLATION INSTRUCTION ...
Page 4: ...C78 ENT M50 IV FEBRUARY 2003 EDITION ...
Page 6: ...C78 ENT M50 OVERVIEW 2 FEBRUARY 2003 EDITION ...
Page 34: ...C78 ENT M50 DIAGNOSTICS 2 FEBRUARY 2003 EDITION ...
Page 37: ...C78 ENT M50 5 FEBRUARY 2003 EDITION NOTES ...
Page 38: ...C78 ENT M50 6 FEBRUARY 2003 EDITION NOTES ...
