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Ignition
Warning System
Warning Horn
Remote control models will have the warning horn located inside the remote control or connected to the ignition key switch.
Tiller handle models will have the warning horn located in the engine cowl.
Warning Light
The warning light will turn on or flash to alert the operator to the warning system situations listed the the following chart.
Warning System Operation
The warning horn will emit either a continuous beep or intermittent short beeps and engine speed will be limited. This will alert
the operator and help identify the following listed situations.
Function
Start up
Engine over temperature
Low oil pressure
Engine overspeed
Water temp or MAP sensor
out of range
Engine Overheat
If the engine overheats, immediately reduce throttle speed to idle. 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 cooling water intake
holes for obstruction. If no obstruction is found, this may indicate a blockage in the cooling system or a water pump problem.
Have the outboard checked by your dealer. Operating the engine while overheated will cause engine damage.
If a steady flow of water is coming out of the water pump indicator hole and the engine continues to overheat, consult your
dealer. Operating an overheated engine will cause engine damage.
NOTE: Should overheating occur and you are stranded, stop the engine and allow it to cool down. This will usually allow some
additional low speed (idle) running time before the engine starts to overheat again.
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Warning System
Sound
Warning Light
One beep
On for 5 seconds Normal system test
Continuous
Continuous
Continuous
Intermittent short
beep
© 2016 Mercury Marine
15732
Description
On
Engine overheat
On
Low oil pressure
Engine speed exceeds maximum
On
allowable RPM
Engine speed will be limited.
Flashes
Consult your dealer for
assistance.
9647
Engine Speed
Limited to 2800
RPM
90-8M0105568 eng MARCH 2016
X
X
X
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Troubleshooting
