Mercury Racing 500R - Page 74

If Engine Guardian has been activated, reduce the engine speed. The problem
will need to be identified and corrected. The system must be reset before the
engine will operate at higher speeds. Moving the throttle lever back to the idle
position will reset the Engine Guardian system. If the Engine Guardian system
has determined the reset has not corrected the problem, Engine Guardian
will remain activated, limiting the throttle. The problem must be identified and
corrected before Engine Guardian will allow the engine to reach a normal
operating RPM.
OVERSPEED REV LIMIT
The overspeed rev limit is set at an RPM greater than the operating range.
In the event that the engine is operated at an RPM greater than or equal to
the overspeed limit, the PCM does not allow the engine to maintain the power
requested by the operator. Refer to Specifications—500R to determine this
engine’s RPM limit.
Upon reaching the beginning of the overspeed rev limit, Engine Guardian will
cut spark incrementally from multiple cylinders until speed control is reached.
There is no audible warning while Engine Guardian overspeed limit is active.
SMARTCRAFT PRODUCT
A Mercury SmartCraft System instrument package can be purchased for this
outboard. A few of the functions the instrument package will display are engine
RPM, coolant temperature, oil pressure, water pressure, battery voltage, fuel
consumption, and engine operating hours.
The SmartCraft instrument package will also aid in Engine Guardian
diagnostics. The SmartCraft instrument package will display critical engine
alarm data and potential problems.
EXHAUST GAS OVER TEMPERATURE
When the Engine Guardian system detects the exhaust gas temperature is
high (fault code 2124‑20), the warning horn will beep and the engine RPM will
be limited. SmartCraft gauges which have the ability display text, will alert the
operator with a short text, long text, and the action which the operator should
follow. This Guardian warning and engine power reduction can possibly be
corrected by inspecting the gear housing water inlet for blockage.
SmartCraft Displayed Text
Short text Critical ‑ Overtemp
Long text Engine exhaust manifold is overheating
Action
Stop the engine and check for gear housing water inlet blockage.
If condition persists, return to port immediately. Service the engine
before next use.
1. Stop the engine.
2. Check the gear housing water inlet for blockage.
FEATURES AND CONTROLS
 64 eng