installation directiVe
44
MAY 2006
N40 ENT M25
N60 ENT M37-M40
20. EDC ANOMALIES INDICATION
Anomalies indicator light
The ECU continuously monitors, with complex self-testing
routines, its own operating conditions as well as those of the
components connected to it and of the engine.
When anomalies are detected, the alarm indicator light on
the indicator and control panel is lighted in manners that
provide a first indication on the severity of the problem.
light off:
no anomaly detected or slight anomaly
that does not compromise operating
safety
light on:
significant anomaly, allowing to proceed to
a service center
blinking light:
severe anomaly requiring immediate
repairs. If possible, shut the engine down.
Blink code
The emission of the anomaly codes detected during self-test-
ing and stored in the ECU starts after pressing and releasing
the “CHECK” push-button on the relay box panel, when
the “BRIDGE - ENGINE ROOM” switch is in the “ENGINE
ROOM” position
The LED located at the side of the push-button and the
EDC indicator light on the indicator and control panel will
simultaneously signal, with two series of emissions at different
frequencies, the blink codes that indicate the anomaly with
decimal numbering.
slow blinks
identify the area of the anomaly (engine, injec-
tors, ...),
fast blinks
identify a specific anomaly.
Every time the push-button is pressed and released, only
one of the stored codes is emitted; therefore, the procedure
must be repeated until an error indication identical to the
first one is obtained, which means the entire error 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
its release, without any subsequent blinking.
Recovery
The recognition of significant or severe anomalies causes
the adoption of strategies that allow to use the engine with
complete safety, guaranteed by limiting performance within
pre-set thresholds according to the severity of the case.
These strategies cause the reduction of the maximum values
of torque and power delivered by the engine.
In the case of intermittent anomalies, i.e. recognized by the
ECU and subsequently no longer present, performance
reduction will continue until the engine is shut down.
Normal operation will be restored only the next time the
engine is started, while the anomaly data will be “saved” in
the failure memory.
Error deletion procedure
A. Shut the engine down and keep the key switch in the
“OFF” position for 15 seconds (after run).
B. Approach the relay box. Keeping the “CHECK” diag-
nostic push-button (3), move the adjacent “BRIDGE
- ENGINE ROOM” switch (1) to the “ENGINE ROOM”,
wait for the luminous indicator (4) to switch off position,
while keeping the diagnostic push-button pressed for 8
more seconds.
C. Release the push-button and move the “ENGINE
ROOM” switch to the “BRIDGE” position
CAUTION
the mistake deleting procedure is intended to eliminate
the information relating to the mistakes from the ecu
memory, which happened during previous working periods.
the mistakes will not be deleted unless the relating cause
has been removed. please remember that some anomalies
can be detected by the ecu self-diagnosis only during a
complete engine working cycle.
At the end of this procedure, the codes of any anomalies
detected during the engine installation and first start-up
operations will be deleted in the ECU. To make sure that no
anomaly data remain stored in it, or that there are no other
errors in the system, set the “BRIDGE - ENGINE ROOM”
switch to the “ENGINE ROOM” position and verify that,
when the diagnostic push-button is pressed, the blink code
light (4) does not emit any code.
At the end of these operations, return the switch to the
“BRIDGE” position
If the ECU signals the presence of errors or operating anoma-
lies, the installation will have to be reviewed to remove the
cause of the error or anomaly.
Indications for decoding the codes are provided in Chapter 21.
note:
The blink code diagnostic procedure provides indi-
cations about current anomalies as well as past anomalies
that are no longer present when the diagnosis is carried out;
therefore, it is absolutely mandatory, at the end of every
repair operation, to erase the error memory to prevent
anomalies whose cause has already been removed from
being signaled in the future.
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1
4
04_074_N
Figure 44
Содержание NEF N40-ENT-M25
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