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livid 05-01-2013 10:38 PM

Flashing "ECU" trouble? 05 245
I purchased a 2005 Maristar 245 with 51 hours about 2 months ago. I test drove the boat the day I purchased it and once a few weeks before and it ran great. When I got it home, it had to sit for 3 weeks due to the weather being cold.

So the first warm day, I took it to the water. When I tried to start it, it would not start and the display started flashing "ECU". I went home, did some research and saw it might be a ground connection, so I cleaned and tightened every wire i could find as well as check every visible fuse. Replaced the safety switch, switched the batteries. I've spent roughly 4 days after work in the boat cleaning connections and double checking things. And right now the dealer says they are 2 months out on taking a look at it.

When I turn the key to on, the gauges make the winding sound, but none display any data. After about 30 seconds the display screen starts flashing "ECU". When I try to start it, it sounds just like the safety lanyard is off (Like no fire). I don't think I hear the fuel pump wind up (hard to tell) but I press the plug on the fuel rails and gas comes out so it seems to be pressurized with fuel. 8.1L Crusader w/ 51 hours. No perfect pass.

I'm starting to really think it may be the MMDC or ECU??? Is their anything that I may have missed?

CantRepeat 05-02-2013 09:38 AM

Have you check for trouble codes?

livid 05-02-2013 10:18 AM

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Actually I stumbled across a thread you posted on in 2011 last night.... About jumping the A and B terminals on the DLC and using an LED light. I plan on trying this today after work.

CantRepeat 05-02-2013 10:23 AM

You may be able to read the codes by putting the ECM into diagnostic mode and reading the ECU flashes. Using an LED takes a bit more work as that thread explains. It's not just an LED with a couple of wires attached to it.

But, since you found that thread you are on your way. Let us know if you have questions.

rgardjr1 05-02-2013 11:04 AM

Make sure your battery is fully charged. I will get a "BAD ECU" in the display and no gauges when I've run down my battery. My Perfect Pass gauge will still work though. My boat starts just fine when this happens.

michael79 08-19-2013 04:59 PM

Any insights you can share on your problem?

Topp dawg 09-14-2013 09:13 AM

How cani tell if i can use that procedure on my engine? I have a 2003 x10.

CantRepeat 09-14-2013 09:42 AM


Originally Posted by Topp dawg (Post 977924)
How cani tell if i can use that procedure on my engine? I have a 2003 x10.

You boat does have an ECM but I'm not sure which one. You should be able to use that other thread to pull codes. Look for your DLC back near the engine.

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