MerCruiser 8.1 H.O., User Manual

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Section 2 - Getting to Know Your Power Package
Page 34 90-899883273 MARCH 2008
• Seawater pressure too low
The audio warning system will sound with an intermittent beeping if the following occurs:
• Transmission fluid temperature too hot
• Transmission pressure too low
NOTICE
A continuous horn indicates a critical fault. Operating the engine during a critical fault can
damage components. If the warning horn emits a continuous beep, do not operate the
engine unless avoiding a hazardous situation.
If the alarm sounds, stop the engine immediately. Investigate cause and correct it, if
possible. If the cause cannot be determined, contact your authorized Mercury MerCruiser
dealer.
Testing The Audio Warning System
1. Turn the ignition switch to the "ON" position without cranking the engine.
2. Listen for the audio alarm. The alarm will sound if the system is functioning correctly.
Audio Warning System
IMPORTANT: The audio warning system alerts the operator that a problem has occurred.
It does not protect the engine from damage.
Your Mercury MerCruiser power package may be equipped with an audio warning system.
Most faults cause the warning horn circuit to activate. How the warning horn activates
depends on the severity of the problem.
There are three warning horn states:
• Caution
• Severe
• Onboard Diagnostic Marine (OBDM) fault
Caution
If a caution is detected, the audio warning system will sound for six one‑second intervals.
ON ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1
1
1
1
1
1
1
1
1
1
1
OFF
33402
a
b
a - Horn (on or off)
b - Time (in seconds)
Below are some examples of a caution fault:
• Transmission fluid temperature is too hot
• Drive oil is low
• Sensor failure
Severe
IMPORTANT: If you experience a severe fault, contact your authorized Mercury
MerCruiser dealer.