Alarm Messages - Mercury 150 EFI Service Manual

Alarms Warnings – When a problem is detected, the warning horn sounds and the
name of the offending alarm appears on the display.
If problem can cause immediate engine damage – the horn will sound continuously and
the Engine Guardian System (b) will respond to the problem by limiting engine power.
Immediately reduce throttle speed to idle and refer to the warning messages on the fol-
lowing pages that tell what to do.
If problem will not cause immediate engine damage – The horn will sound but not con-
tinuously. Refer to the warning messages on the following pages that tell what to do.
The alarm message will stay displayed until the mode button is pressed. If there are
multiple alarms, these will cycle on the display at five-second intervals.
If the mode button is pressed to a different screen, the flashing alarm signal "AL" (c)
will appear in the upper right corner to indicate there still is a problem.
Engine Guardian System – Monitors the critical sensors on the engine for any early
indications of problems. The system will respond to a problem by reducing engine pow-
er in order to maintain a safe operating condition. The display screen will show the per-
cent of power available.

Alarm Messages

These messages will appear and the horn will sound if there is a problem detected in one
of the engine systems.
NOTE: The warning system will alert the operator to the potential problems listed in the
chart. Refer to the page listed for explanation of the problem and the correct action to take.
PROBLEM
BATTERY *
ENGINE DATA BUS
FAULT – HORN
FAULT – IGNITION
FAULT – INJECTOR
FAULT – OIL PUMP
FAULT – SENSOR
FAULT – WATER TEMP
LOW FUEL
LOW OIL
OIL TEMP
OIL PSI
OVERHEAT
OVER SPEED
PRESSURE
RESERVE OIL
WATER IN FUEL
FLASH CHECK SUM
MAP
MAT
TPS
* Throttle and manifold pressure sensors only
90-883728 JULY 2001
TACHOMETER
DISPLAY
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
SPEEDOMETER
DISPLAY
F
F
WIRING DIAGRAMS
ENGINE HORN
GUARDIAN ONLY
SYSTEM
ACTIVATED
F
F
F*
F
F
F
F
F
F
F
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