Visual And Audio Warning Systems-350/377 Mag Ect And Seacore 350/377 Mag Ect; Service Engine Light And Obd-M Mil Kit; Testing The Obd-M Malfunction Indicator Lamp (Mil); Audio Warning System - Mercury 350 MAG Manual

Section 2 - Getting to Know Your Power Package
7. The Quicksilver MerCathode System has a 20 amp in‑line fuse in the wire which connects to the positive (+) terminal on
controller. If the fuse is blown, the system will not operate resulting in a loss of corrosion protection.
Visual and Audio Warning Systems—350/377 MAG ECT and SeaCore 350/377
MAG ECT
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.
The service engine icon or MIL will provide a visual indication of a malfunction with the engine's emission control system and will
remain illuminated while the OBD‑M fault is active.

Testing the OBD-M Malfunction Indicator Lamp (MIL)

1. Turn the ignition switch to the on position without cranking the engine.
2. The service engine icon and MIL light will remain illuminated for 4 seconds if the visual indication 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.
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
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SC 1000 gauge and service engine light
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90-8M0050539 MAY 2011
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