MerCruiser Vazer 100, Owner'S Manual

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Section 2 - Getting to Know Your Power Package
90-899883182 NOVEMBER 2007 Page 31
• Engine temperature is too hot
• Seawater pressure is too low
The audio warning system will sound with an intermittent beeping if the following occurs:
• Sterndrive oil level is 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 you cannot determine the cause, 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.
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
• Engine overspeed
• Exhaust Manifold Temperature
Also the Engine Guardian Strategy will reduce engine power to 90 percent of maximum if
any sensor on the power package fails.
For example, if the water inlet becomes partially blocked, Engine Guardian Strategy will
reduce the available power level of the engine to help prevent damage from decreased
cooling water flow to the engine. If the debris passes through and full water flow is restored,
engine power levels are restored to normal.
To avoid a possible recurrence of the problem you should contact an authorized Mercury
MerCruiser dealer. The ECM stores the fault and with this information the technician will
be able to more rapidly diagnose problems.
Warning Horn Signals
Most faults will cause the warning horn circuit to activate. How the warning horn activates
depends on how serious the problem is. There are four warning horn states:
• Caution ‑ horn signal varies with product line and calibration. Minimal guardian.
• Warning ‑ horn signal varies with product line and calibration.
• Severe ‑ horn is beeping constantly.
• Critical ‑ horn is beeping constantly and guardian will be at forced idle.
In addition, depending on the gauge package, there will be warning icons and fault
messages on the dash mounted gauges.