Alarm Messages - Mercury 225 EFI Service Manual

3.0 litre work, electronic fuel injection

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Alarm Messages

These messages will appear and the horn will sound if there is a problem detected in one

of the outboard systems.

NOTE: The warning system will alert the operator to the potential problems listed in the

chart. Refer to explanations following.

ENGINE DATA BUS

FAULT – HORN

FAULT – IGNITION

FAULT – INJECTOR

FAULT – OIL PUMP

FAULT – SENSOR

FAULT – SPEEDO

FAULT – WATER TEMP

UNIT MISMATCH

(MULTI ENGINE)

WATER IN FUEL

* Throttle and manifold pressure sensors only

The overheat alarm message appears and the warning horn begins sounding continuous-

ly. The Engine Guardian System will start limiting engine power.

If the engine overheats, immediately reduce throttle speed to idle. Shift outboard into neu-

tral and check for a steady stream of water coming out of the water pump indicator hole.

NOTE: The throttle will have to be returned to idle to reset the system.

If no water is coming out of the water pump indicator hole or flow is intermittent, stop en-

gine and check cooling water intake holes for obstruction. If no obstruction is found, this

may indicate a blockage in the cooling system or a water pump problem. Operating the

engine while overheated will cause engine damage.

If a steady stream of water is coming out of the water pump indicator hole and the warning

horn continues to sound, there still may be insufficient cooling water or an engine problem.

Stop engine. Operating the engine while overheated will cause engine damage.

90-884294 OCTOBER 2001

Water Pump Indicator Hole

WIRING DIAGRAMS

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