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**JimMc** · 08-04-2012, 05:34 AM

I have no idea but found this searching.

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This table is a guick guide, showing what warning output will accompany a fault for the Mercruiser Sterndrive engines. (MCM)

Warning system Faults, SC1000 Yes/No, Audio Alarm, Available Power %, Description.

(1) Cam Sensor Yes 2 Bp/min 90% Open or short, engine must be cranking to set this fault code.

(2) ECT CKT HI Yes 2 Bp/min 90% Open

(3) ECT CKT LO Yes 2 Bp/min 90% Short

(4) ECT Coolant Overheat Yes Constant 6-100 % Engine guardian overheat condition

(5) EST 1-8 Open Yes 2 Bp/min NA Coil harness wire open

(6) EST 1-8 Short Yes 2 Bp/min NA Coil harness wire short

(7) Fuel Injector 1-8 Open Yes 2 Bp/min NA Fuel injector wire open.

(8) Fuel Injector 1-8 Short Yes 2 Bp/min NA Fuel injector wire short

(9) IAC Output Yes 2 Bp/min 90% Only with rpm

(10) Knock Sensor 1 Yes 2 Bp/min 90% Alarm sounds for 20 seconds in NEUTRAL and indefinitely in gear.

(11) Knock Sensor 2 Yes 2 Bp/min 90% Alarm sounds for 20 seconds in NEUTRAL and indefinitely in gear.

(12) Low Drive Lube Strategy Yes Steady Bp 0-100% Low oil in sterndrive.

(13) Low Oil Pressure Strategy Yes Constant 0-100% Low oil pressure strategy.

(14) MAP Sensor 1 Input High No 2 Bp/min 90% Short, no visual on SC1000.

(15) MAP Sensor 1 Input Low No 2 Bp/min 90% Open, no visual on SC1000.

(16) MAT Sensor Yes 2 Bp/min 90% Open or short in MAT circuit.

(17) Oil PSI CKT Hi Yes 2 Bp/min 90% Short, defaults to 51.7 psi.

(18) Oil PSI CKT Lo Yes 2 Bp/min 90% Open, zero oil pressure.

(19) Overspeed Yes Constant RPM Limit Engine over rpm limit

(20) Port EMCT CKT Hi Yes 2 Bp/min 90% Open, defaults to 32 degrees F.

(21) Port EMCT CKT Lo Yes 2 Bp/min 90% Short, defaults to 32 degrees F.

(22) Port EMCT CKT Overheat Yes Constant 6-100% Overheat condition, 212

degreesF(100 degrees C) limit.

(23) Sea Pump PSI Lo Yes Constant 6-100% Low water pressure strategy, defaults to 43.4 psi.

(24) Sea Pump CKT Hi Yes 2 Bp/min 90% Open.

(25)Sea Pump CKT Lo Yes 2 Bp/min 90% Short.

(26) STB EMCT CKT Hi Yes 2 Bp/min 90% Open, defaults to 32 degrees F.

(27) STB EMCT CKT Lo Yes 2 Bp/min 90% Short, defaults to 32 degrees F.

(28) STB EMCT CKT Overheat Yes Constant 6-100% Overheat condition, 212 degrees (100 degrees C) limit.

(29) Steer CKT Hi Yes No No Open and short.

(30) TPS1 CKT Hi Yes 2 Bp/min 90% Short, signal to 5v+, engine will not start. Refer to data monitor screen.

(31) TPS1 CKT Lo Yes 2 Bp/min 90% Open.

(32) TPS 1 Range Hi Yes 2 Bp/min 90% Above 4.8v, 994 counts.

(33) TPS 1 Range Lo Yes 2 Bp/min 90% Below 0.5v, 35 counts.

(34) Trim CKT Hi Yes No No Short, high range, visual warning on SC1000 only.

(35) Trim CKT Lo Yes No No Open, low range, visual warning on SC1000 only.

(36) 5 VDC PWR Low Yes 2 Bp/min varies Short any 5v+ to ground.

Here's some other information that what will sound the alarm on a mercruiser Engine.

Constant tone alarms are for:

1.) engine coolant temp overheat,

2.) low engine oil pressure,

3.) engine overspeed,

4.) exhaust manifold cooling temp overheat

5.) sea pump PSI low.

Note #5 is known to be a common problem, It's been said that this fault might not show up in the fault history section of the scan tool.

If that is the case then the only other way to know if this is your problem, is to watch this sensor live as it happens out on the water with the scan tool hooked up to the engine.

Also make sure all the Battery cables are clean & tight plus a fully charged Battery is very important.

Check the water pressure sensor threads for any paint, Also check the sensor to see if it has come loose or Has a blockage of some kind.

If any sensor loses it's ground it could sound the alarm. As an additional test, try adding a ground wire to the sensor threads to stop the horn.

Or there is a chance you could have picked up or created some air bubble for a short time, until the boat slowed down, possibly due to the brass water pump impeller Housing could be failing do to deep grooves inside housing creating a disturbance with the water flow.

Constant beep alarms are for:

1.) low outdrive lube level.

Two Alarm beeps every 60 seconds are for:

1.) Faulty cam,

2.) IAC,

3.) MAP,

4.) MAT,

5.) knock sensors.

6.) open/short in the engine cooling temp circuit

7.) open/short in fuel injector wiring circuit,

8.) open/short in oil PSI circuit,

9.) open/short in exhaust manifold cooling temp circuit,

10.) open/short in sea pump circuit,

11.) open/short in throttle position circuit

& here are a couple shortcuts to other discussions of the same thing

http://www.clubsearay.com/forum/showthread.php?t=19465

http://forums.iboats.com/showthread.php?t=245688

**MidnightSun** · 08-04-2012, 05:41 AM

Thanks for the input, I also have been searching and found out dual beeps translates to something calle a "soft alarm" which can be almost anything as you listed. Right now I am really thinking total failure of the IAC.

**Guest** · 08-04-2012, 08:25 AM

MidnightSun wrote:
Long Story short, My boating friend is on his way up to meet us in the Thousand islands. He called me to say he having mechanical problems and one engine will not start. Right now he is stuck at the Eisenhower locks and scratching his head. Any advice on this will be greatly appreciated.

2005 Chapparral 330

Twin 5.7 mercruiser mpi horizons with closed cooling coupled to BIII drives

He said he got a dual beep alarm 15 mins before he reached the locks which continued until he got there. Did not see anything amiss on any of the gauges. as not able to fire up one engine when he was called into the locks. He also said he checked both drive fluid bottles and both were full.

Anybody know what twin beeps means? He said engines felt normal heat wise although he did find a slightly kinked coolant hose which he corrected. What can possibly be preventing engine startup? [SIZE]5 wrote:
HELP[/SIZE]

PS. This boat has no lanyards.

Have him check the high pressure fuel rail. There is a valve cap just like a tire valve. Using a rag to stop fuel spray push on the valve. There should be fuel spraying out of there.

Also when he turns the key on he should hear the fuel pump run for 10 seconds then stop. If it doesn't then check the fuel pump relay. They have a habit of getting burned terminals. If they are burned clean them as best as possible then put a slight twist in the male terminal so it fits tighter.

I am assuming he has checked for spark and the starter turns the engine.

**MidnightSun** · 08-14-2012, 06:47 AM

UPDATE.

It was the IAC valve which was causing the no start. Unfortunately my friend was stuck in a marina for 5 days before he was able to get the part and continue his vacation. As luck would have it, he broke down enroute on a Friday afternoon and it was a long weekend. This alone cost him 3 of the 5 days. Lesson learned and I ordered a spare IAC to keep on board as this part is really problematic. So much so I wonder why Merc has not been called for a class action law suit. In a bind he should have taken it off and tried cleaning it with carb cleaner or wd40 or whatever he has to render it usable as this MAY have got him up and running again. Another lesson learned!

**Guest** · 08-14-2012, 08:02 AM

See my post on the IAC valve. Mine went out last week at the dock and caused a little boat rash. If just needed for idle you can disconnect the hoses from it. Replace at any auto parts store.

Rock

**MidnightSun** · 08-14-2012, 09:43 AM

Thanks, I already saw it and did take note of the automotive alternative at 1/2 the price. Unfortunately I had already ordered the Merc part for $115 delivered. Another lesson learned. Geeze, so much learning in such a short time you would think it is my first day on the water. :right

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