Section 2 - Getting to Know Your Power Package
Page 28 90-899883295 JUNE 2008
SEVERE
IMPORTANT: If you experience a severe fault, contact your authorized Mercury
MerCruiser dealer.
If a severe fault is detected, the audio warning system will sound for six seconds, turn off
for six seconds, then sound for six more seconds.
a - Horn (on or off)
b - Time (in seconds)
Below are some examples of a severe fault:
• Engine oil pressure is too low
• Engine temperature is too hot
• Seawater pressure is too low
• Transmission pressure is low (select models)
OBDM
If an OBDM fault is detected, the audio warning system sound with one five‑second horn,
then one short, 1/2‑second horn every 60 seconds for certain faults related to the emissions
or fuel system. See your authorized Mercury MerCruiser dealer for assistance.
OFF
ON
5 60 60 60
½ ½ ½
ON ON ON
OFF OFF
a - Horn (on or off)
b - Time (in seconds)
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.
Engine Guardian Strategy
IMPORTANT: Boat speed could be reduced to idle and may not respond to the throttle.
Engine Guardian Strategy is designed to help reduce the potential for engine damage by
reducing engine power when a potential problem is sensed by the ECM. Engine Guardian
monitors:
• Oil pressure
• Coolant temperature
• Seawater pressure
• Engine overspeed
• Exhaust Manifold Temperature [8.1 liter (496 cid) engines only]
Also the Engine Guardian Strategy will reduce engine power to 90 percent of maximum if
any sensor on the power package fails.
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