ECM PROBLEM 340FV

downunder · October 2022

have an ecm problem on one engine. engine will not rev over 3400 when under load. have swapped ecm's on the engines and problem follows.

Its like a rev limiter action where the engine just momentarily stops and you can see the tacho bouncing. once you drop the revs to 3400 all good etc

So i need to replace the ecm, now looks like no longer available from mercruiser!!!

the details on the ecm and engines as follows

Original delphi part # is 16236999 [see pic attached] am also told mercruiser part # 861926T3. This supersedes to 892798A01 kit and when i google it

This product is no longer available!!!!!!!!!!!

My existing engines are the 350 merc with efi [throttle body] rated at 260 hp

Engine details 2001 mercruiser 5.7 tbi 260 hp Eng serial # OMO15253 & OMO15252

would anyone have a used one they want to sell or know where i could get a new one or a used one?

really appreciate your help on this as its starting to bug me,

I am coming over next week for a trade show in Las Vegas so i will be on your side of the world,

regards john

aero3113 · October 2022

There’s one on eBay but it says it was repaired by a shop. Maybe there’s a shop near you that can repair it. Would probably be much cheaper than buying one.

https://www.ebay.com/itm/185613516618?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=7HErPoNoQMy&sssrc=2349624&ssuid=jb9VSTJCQVS&var=&widget_ver=artemis&media=COPY

davidbrooks · October 2022

Have you read the codes on the ECM to see if there is something else going on and it just isn't in guardian mode. Other faults will limit the engine to 85% power.

Dutch320 · October 2022

This business says that they have one, hopefully it’s brand new for what they want for it but they do seem pretty hard to find. Good luck https://obd2allinone.com/mefiecms.asp
updated the link, they cleared the shopping cart link I posted earlier.

Cableguy Greg · October 2022

Dutch320 said:

This business says that they have one, hopefully it’s brand new for what they want for it but they do seem pretty hard to find. Good luck https://obd2allinone.com/sc/cart.asp

Good find. I would be interested in their code reader for $295.

Dutch320 · October 2022

Me too @Cableguy Greg now that you pointed it out, much better price than the alternatives

Ian · October 2022

Looks very interesting.

downunder · October 2022

many thanks to you all for your replies. Think i will bring the ecm with me and have it checked out at OBD. That replacement cost of nearly 2.5K is crazy but options are limited. No way would i get another boat and start all over again. An engine upgrade would be good but big job and big dollars.

Thanks again regards John

Ian · November 2022

Ian said:

Looks very interesting.

Anyone made the plunge to get one of these?

https://obd2allinone.com/555scan.asp

LaRea · November 2022

@Ian that looks like a nice system. Interesting feature: it shows not only fault codes, but also freeze frame data.

I didn't know this: When the ECM throws a fault code, it saves a "freeze frame" of engine data at that moment (RPM, voltage, and everything else the ECM can see). That would be really useful in troubleshooting.

earl1z19 · November 2022

The price makes that really attractive. $295 would cover probably 3 times of having a mechanic come and reset any fault codes.

davidbrooks · November 2022

The Rinda Techmate does all of this as well. It is a little more expensive but doesn't require a laptop. I keep mine onboard as it is small and use it all the time.

TonyG13 · November 2022

davidbrooks said:

The Rinda Techmate does all of this as well. It is a little more expensive but doesn't require a laptop. I keep mine onboard as it is small and use it all the time.

Only problem is Rinda has been "out of stock" on all three versions for months. I'll probably get around to emailing them this winter if they're ever going to get them back in.

davidbrooks · November 2022

Didn't know that.

Ian · November 2022

LaRea said:

@Ian that looks like a nice system. Interesting feature: it shows not only fault codes, but also freeze frame data.

I didn't know this: When the ECM throws a fault code, it saves a "freeze frame" of engine data at that moment (RPM, voltage, and everything else the ECM can see). That would be really useful in troubleshooting.

I think also the freeze frame data needs to be cleared to really get rid of the fault once diagnosed. I like the idea of getting hours per RPM range too. Yes you need a PC but then maybe it is easier to do data captures to save.

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