Mercury 150 Manual page 31

FEATURES AND CONTROLS
The warning horn will emit either a continuous beep or intermittent short beeps. This will alert the operator
and help identify the following listed situations. For visual display of the specific engine functions and for
additional engine data, refer to SmartCraft Product information, following.
Function
Start Up
Low Oil Reserve
Water in Fuel
Cooling System Problem Continuous
Oil Level is Critically Low Continuous
Oil Pump Failure
Engine Overspeed
Sensor out of Range
ENGINE GUARDIAN SYSTEM
The Engine Guardian System monitors the critical sensors on the engine for any early indications of
problems. The system will respond to a problem by emitting a continuous beep and/or reducing engine
power in order to provide engine protection.
If Guardian System has been activated, reduce throttle speed. The horn will turn off when throttle speed
is within the allowable limit. Consult your dealer for assistance.
Warning Horn
Sound
One Beep
Four Beeps every 2 Minutes Oil lever is low in the engine mounted oil
Four Beeps every 2 Minutes Water in the water separating fuel filter
Continuous
Continuous
Continuous
Intermittent Beep
25
Description
Normal System Test
reservoir. Refill the engine mounted oil
reservoir along with the remote oil tank. Refer
to Fuel & Oil.
reaches the full level. Water can be removed
from the filter. Refer to Maintenance - Fuel
System for filter removal.
Engine Guardian System is activated. Power
limit will vary with level of overheat. Shift
outboard into neutral and check for a steady
stream of water coming out of the water pump
indicator hole. If no water is coming out of the
water pump indicator hole or flow is
intermittent, stop engine and check water
intake holes for obstruction. The Guardian
System must be RESET before engine will
operate at higher speeds. Moving throttle
lever back to idle resets the system.
Engine Guardian System is activated. Power
will be limited. The oil level is critically low in
the engine mounted oil reservoir. Refill the
engine mounted oil reservoir along with the
remote oil tank.
Engine Guardian System is activated. Power
will be limited. The warning horn is activated
if the oil pump should ever stop functioning
electrically. No lubricating oil is being
supplied to the engine.
The warning horn is activated any time
engine speed exceeds the maximum
allowable RPM. The system will limit the
engine speed to within the allowable range.
Engine overspeed indicates a condition that
should be corrected. Overspeed could be
caused by incorrect propeller pitch, engine
height, trim angle, etc.
Engine Guardian System is activated. Power
will be limited.