Engine Diagnostics
i06542464
Self-Diagnostics
Perkins
electronic
engines
can
perform
a
self-
diagnostics
test.
When
the
system
detects
an
active
problem,
a
diagnostic
lamp
is
activated.
Diagnostic
codes
will
be
stored
in
permanent
memory
in
the
Electronic
Control
Module
(ECM).
The
diagnostic
codes
can
be
retrieved
by
using
the
electronic
service
tool.
Refer
to
Troubleshooting,
“Electronic
Service
Tools”
for
further
information.
Some
installations
have
electronic
displays
that
provide
direct
readouts
of
the
engine
diagnostic
codes.
Refer
to
the
manual
that
is
provided
by
the
OEM
for
more
information
on
retrieving
engine
diagnostic
codes.
Alternatively
refer
to
Troubleshooting,
“Indicator
Lamps”
for
further
information.
Active
codes
represent
problems
that
currently
exist.
These
problems
should
be
investigated
first.
Logged
codes
represent
the
following
items:
• Intermittent problems
• Recorded events
• Performance history
A maximum of 6 codes can be stored at one time.
If 6 codes are already present, then the engine will
still react to another fault, but the fault will not be
logged by the ECM.
The problems may have been repaired since the
logging of the code. These codes do not indicate that
a repair is needed. The codes are guides or signals
when a situation exists. Codes may be helpful to
troubleshoot problems.
When the problems have been corrected, the
corresponding logged fault codes should be cleared.
i04053182
Diagnostic
Lamp
A
diagnostic
lamp
is
used
to
indicate
the
existence
of
an
active
fault.
Refer
to
Troubleshooting
,
“Indicator
Lamps”
for
more
information.
A
fault
diagnostic
code
will
remain
active
until
the
problem
is
repaired.
The
diagnostic
code
may
be
retrieved
by
using
the
electronic
service
tool.
Refer
to
Troubleshooting
,
“Electronic
Service
Tools”
for
more
information.
i05142509
Fault
Logging
The
system
provides
the
capability
of
Fault
Logging.
When
the
Electronic
Control
Module
(ECM)
generates
an
active
diagnostic
code,
the
code
will
be
logged
in
the
memory
of
the
ECM.
The
codes
that
have
been
logged
by
the
ECM
can
be
identified
by
the
electronic
service
tool.
The
active
codes
that
have
been
logged
will
be
cleared
when
the
fault
has
been
rectified
or
the
fault
is
no
longer
active.
i06748909
Engine
Operation
with
Active
Diagnostic
Codes
If
a
diagnostic
lamp
illuminates
during
normal
engine
operation,
the
system
has
identified
a
situation
that
is
not
within
the
specification.
Use
electronic
service
tools
to
check
the
active
diagnostic
codes.
Note:
The
power
may
be
limited
until
the
problem
is
corrected.
If
the
oil
pressure
is
within
the
normal
range,
the
engine
may
be
operated
at
the
rated
speed
and
load.
However,
maintenance
should
be
performed
as
soon
as
possible.
The
active
diagnostic
code
should
be
investigated.
The
cause
of
the
problem
should
be
corrected
as
soon
as
possible.
If
the
cause
of
the
active
diagnostic
code
is
repaired
and
there
is
only
one
active
diagnostic
code,
the
diagnostic
lamp
will
turn
off.
Operation
of
the
engine
and
performance
of
the
engine
can
be
limited
as
a
result
of
the
active
diagnostic
code
that
is
generated.
Acceleration
rates
may
be
significantly
slower.
Refer
to
the
Troubleshooting
for
more
information
on
the
relationship
between
these
active
diagnostic
codes
and
engine
performance.
i04053849
Engine
Operation
with
Intermittent
Diagnostic
Codes
If
a
diagnostic
lamp
illuminates
during
normal
engine
operation
and
the
diagnostic
lamp
shuts
off,
an
intermittent
fault
may
have
occurred.
If
a
fault
has
occurred,
the
fault
will
be
logged
into
the
memory
of
the
Electronic
Control
Module
(ECM).
44
SEBU9075-03
