Re: 1995 mercury225 warnign horn and lights
Hi,
welcome to the board.
Do you have a manual for this motor ? Need to know the how it 's beeping.
Is it all the time or every 2 min? but right now things you'll need to do.
1 Check all wire connections (tight and clean)
Under normal conditions, ECM controls and provides:
Spark timing by monitoring engine RPM, throttle
shutter opening and coolant temperature.
Cold engine starting by advancing spark timing and
opening fuel enrichment valve.
Over-speed protection in the event engine RPM exceeds
6000 for carb models and 6100 for EFI models.
This is accomplished in two stages. Initially timing
is gradually retarded to reduce RPM to 5900 for
carbmodels and 6000 for EFImodels. If RPM continues
to increase above 6400 for carb models and
6500 for EFI models -- i.e.-- propeller breaks water
surface -- timing will rapidly retard to 2?ATDC to prevent
any further RPM increase.When an over-speed
condition occurs, the low-oil and overheat lamps will
illuminate alternately and thewarning hornwill be activated.
Warning control of LOW-OIL, WATER SEPARATOR
and OVER-HEAT conditions. Warning is provided
through activation of a horn and indicator lamps. A
LOW-OIL condition exists when switch in engine mounted
oil tank is shorted to ground (CLOSED). A
WATER SEPARATOR condition exists when excessive
water accumulates in the bottom of the separator
to short out the sensor. In either case, 30 seconds
after switch is closed, the warning lamp will illuminate
and the warning horn will be activated. The horn will
beep 4 times in 1 second intervals followed by a 2
minute off-period. It will then repeat its beep sequence.
Continuous lamp illumination and horn beep
sequence will occur until the key switch is turned off.
If there is no LOW-OIL condition then the WATER
SEPARATOR must be checked. An OVER-HEAT
condition occurs when the coolant temperature rises
above 200?F (93.3?C). The warning lamp will illuminate
and the over-heat horn will sound continuously.
The ECM will retard the ignition timing until a maximum
RPM of approximately 3000 is obtained. The
ECM will maintain this RPM until engine temperature
drops to 190?F (87.8?C).
Throttle position and engine temperature sensor failure
warning to boat operator. Sensor failure is indicated
by alternately illuminating the low-oil and overheat
lamps as well as activating the warning horn.
This warning will occur 15 seconds after a sensor failure
has been detected by the ECM. The warning will
continue until the key switch is turned off or sensor
problem is corrected.
Controls Power-Up Sequence -- 1/2 second after ignition
key is turned to ?ON?, and power is applied to
ECM, warning lamps will illuminate for 1/2 second
and horn will beep for 1/2 second.
-- Air temperature and/or MAP sensor failure will
sound an intermittant warning horn and alternately
flash the low oil and overheat lights on the dash.
-- Fuel ECM wire harness plug disconnect will sound
an intermittent warning horn and alternately flash the
low oil and overheat lights on the dash. Engine will
not run.
This is a good start for you. Post back what you find.
