Section 2 - Getting to Know Your Power Package
Page 34 90-8M0074347 eng OCTOBER 2012
The 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 two warning horn states:
• Caution
• Severe
Caution
If a caution state is detected, the audio warning system will sound for six one‑second intervals.
a - Horn (on or off)
b - Time (in seconds)
Below are some examples of a caution state:
• Drive oil is low (sterndrive models only)
• Sensor failure
Severe
IMPORTANT: Operators are advised to contact an authorized Mercury MerCruiser dealer if a severe fault is activated.
If a severe state is detected, the audio warning system sounds for six seconds, turns off for six seconds, and sounds for six
more seconds. Then the audio warning system sounds for two half‑second intervals every sixty seconds.
a - Horn (on or off)
b - Time (in seconds)
Below are some examples of a severe state:
• Transmission fluid temperature is too hot (inboard models only)
• Engine oil pressure is too low
• Engine temperature is too hot
• Seawater pressure is too low
• Transmission pressure is low (inboard models only)
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.
Service Engine Light and OBD‑M MIL Kit
Boats powered by emissions control technology (ECT) catalyzed engines must be equipped with a SmartCraft‑enabled gauge
capable of displaying the service engine icon, or a dash‑mounted service engine light. Malfunction indicator lamp (MIL) kits
containing a dash‑mounted service engine light and a special harness that connects to the engine harness may be purchased
separately.
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6 6 6
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60
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