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5. Engine Alarms and Instrumentation
Digital Alarms
If, for any reason, one or more of these sensors or
associated wiring malfunctions, the ECM’s built in
self-diagnostic system sets a trouble code and turns on
the Malfunction Indicator Light (MIL) or sounds a buzzer
to alert the operator of a malfunction.
The MIL, buzzer and gauges can signal that something
is wrong before it becomes serious enough to cause an
expensive repair. Paying attention to the MIL, buzzer and
gauges could also save you or others from injury. The
MIL may be replaced by verbiage such as “Service
Required” on boats equipped with electronic instrumen-
tation.
The MIL or “Service Required” notice comes on when
there is a problem with an engine function. Gauges can
also indicate when there is a problem with an engine
functions. Often gauges and the MIL (Service Required)
work together to let you know that there is a problem
with your engine.
In most cases, when the “MIL” is on, the engine(s) may lose
some performance and/or efficiency, but remain running
adequately. Also, the light may go out or become
intermittent, but a trouble code will be logged for future
diagnosis. In any case, the operator must obtain service
by an authorized dealer to determine and repair the
exact cause of the malfunction.
The engine ECM is programmed to control the engine
alarm system. This system is configured to turn on an
instrument panel mounted indicator (“MIL” or “Check
Engine”) light, and, optionally, an audible (“buzzer”)
alarm to warn the operator of engine problems.
If the “MIL” lights and/or the “buzzer” sounds during
operation, the operator should scan the instrument
panel readings for possible sources of trouble.
Conditions that may cause alarm activation include:
• Low Oil Pressure
• Engine Overheat (High Temperature)
• Electronic Throttle Malfunction
• Engine Misfire
See Section 11: Engine Diagnostics and Codes for more
information.
If the boat is equipped with CAN-Buss Messaging
(Electronic Instrumentation), the main screen will likely
display a “Service Required” message when the ECM
records an active trouble code.
IMPORTANT: A failure with the Electronic Throttle
will result in idle only operation of the engine. In some
cases, the throttle may be reset by turning the key off
and then restarting the engine. The operator should
contact his servicing dealer to determine the exact
cause of the failure.
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