Question about 2002 Mercury Mariner

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Alarm warning system on '02 Mercury Mariner 150HP E.F.I.-

Today my engine warning system began making 4 loud, piercing beeps when the outboard engine was running...the owners manual tells me to refer to the engine operation maintenance manual for a description of the alarm/problem being indicated...however there is no such manual included with my papers. Please help as I am supposed to take my boat out for the rest of the weekend out of town and must know what this means!!

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If the alarm has been triggered the horn will sound four (4) times when you disarm the alarm. beep beep beep beep The LED will be blinking very fast.

To identify what caused the alarm to be triggered:
Open the door and press the Emergency Override button. Do not turn the ignition on.
Count the number of times the horn sounds
beep codes:
1 honk = impact sensor
2 honks = ignition was turned on
3 honks = N/A
4 honks = door or trunk opened

Posted on Jul 05, 2008

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How long was if running before beeps ? if it was stored most of the season did you check to see if the water pump was squirting out lots of water when started ? usually there will be an alarm onthe low water pressure sensor or on the overheat warning sensor make shure water is spraying out of exaust just above water line check that first . if there is very little water coming from water pump then you should inspect water pump impeller before running to much its an easy repair and with some simple tools you can repair right at the marina on the trailer part is about 60.00 good luck and let me know how it goes bye for now

Posted on Jul 05, 2008

  • Terry Curtis Mar 14, 2015

    Ok I have a 1994 force that the alarm starts sounding after and only after running full throttle have put in new impeller and head gasket it's got a good steady stream so I know the impeller is pumping good it don't do it running half throttle all day could I have a bad heat sensor


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Engine tank should be plumb full tight. The engine supplies about 2 lbs pressure through one of the 2 lines going to the boat tank. The other line takes the oil to the engine tank. If that line gets kinked or pinched, the engine tank won't get oil, a check valve lets a little air into it, and the oil pump keeps getting oil. When it goes down just a little, the alarm goes off telling you something is wrong.

Sludge in the boat tank could plug up the pickup screen. I've also seen them plugged up by a foil oil bottle seal carelessly dropped into the tank.

Once you find out why the oil couldn't get there, start the engine with the cowl off and loosen the cap on the engine oil tank until it leaks, then tighten it down and clean up the mess. That tank is normally plumb full tight.

If when the engine is running, you crack the cap on the boat tank, you should hear pressure let off. If the cap leaks, it won't build up pressure. If there is pressure, the oil line is plugged or kinked.

If pressure isn't supplied, the problem would be the crankcase check valve on the engine, lower forward starboard side, with the hose going to it.

hope it helps

Posted on Jul 05, 2008

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