V85TT ECU bricked help?

[gomesnz]

Hello folks I am new to Wildguzzi.

What brings me here,is by V85TT. 2019, 67K kms and loving it.

Its the early model with the Marelli 7SM ECU. I have remove the cat and done a few other things that has resulted in me spending some time adjusting the maps in the ECU. Quite some learning experience, non the less some fun. I have run about 50 different maps in her over the last 2 years, and my last challenge has been removing the pre-detonation when under load between 3000 and 4000rpm.

I do all my mapping as per the book, dedicated win7 laptop, battery charger, Guzzi Diag writer program. And its worked a charm, until now. So I tweaked a few things in the map this morning and set it up to download in the Guzzi, while I kept the wife happy and did the dishes. Uhm, the result wasn't good as the power cable from the GPO was unplugged and I didn't notice. The result was that the laptop shutdown, I am guessing mid upload. I know it did the erase part. So its bricked at the moment and I can't communicate with the ECU.

I will disconnect the negative cable for a few hours and reconnect it, to see if that type of resets restores comm's. Likely it won't so I am posting here.

I see in the threads that there are some references from Beetle about recovering the ECU. But no instructions anywhere on the net as to how to do this. Any suggestions help appreciated. Note I work in IT so the computer stuff isn't a problem

tks Darrin.

[mondtster]

Unfortunately, I can't help with a specific solution to your problem. Hopefully you post with a fix at some point so we all have a good reference.

But, painting with broad brush strokes, one thing I have learned over the years of flashing various ECUs is that if a flash fails I would not interrupt the power going to the ECU. There is a chance that starting over without powering down the ECU will result in a successful flash or at least a successful enough one that the ECU isn't bricked, needing extra attention. It sounds like you're past that point but it may be something that helps someone else. It should also be noted that I am not certain if this would or would not work on a Marelli ECU.

When I have flashed my V85 I have always felt that the process was a bit finicky compared to other ECUs I've dealt with so I've always been very cautious.

[GuzziOrDeath]

For recovery, you must first ensure the port settings have latency set to 1mS. There are no specific instructions for recovery, other than the port latency. The Writer will automagically enter recovery mode if comms can't be initialised.

It can take more than 20 attempts before the ECU will go into recovery mode. Don't worry if it doesn't happen immediately.

[Moparnut72]

I don't know much about this kind of stuff. I had issues with my V7lll when I had to mess with front ABS sensor due to a fork oil leak. The bike would barely start and wouldn't take any throttle. I tied the neg and positive battery cables together for a bit, then  let it idle for 13 minutes as someone here suggested. The idle changed markedly at 13 minutes and all was good. The last part probably doesn't apply but tying the cables together might. I saw a guy do that with a Chevy S10 that wouldn't start, fired right up afterward. Worth a try,won't hurt anything if it doesn't.
kk

[Shiny Hat]

Wow, a quick read of that and I thought you were trying to weld or watch a fuse burn.

[Vagrant]

Wow, a quick read of that and I thought you were trying to weld or watch a fuse burn.

FWIW I was told to turn the key on and hit the brake life to drain the last of the juice from the computer. From the Toyota forum.

[Shiny Hat]

FWIW I was told to turn the key on and hit the brake life to drain the last of the juice from the computer. From the Toyota forum.

Yeah, I get it, resistor between the disconnected battery terminals to bleed of any capacitors or whatever the suggested methods can be.

It was the way it read to tie the positive and negative together and idle for 13 minutes. I know what was meant it was just a wait… what moment.

[gomesnz]

For recovery, you must first ensure the port settings have latency set to 1mS. There are no specific instructions for recovery, other than the port latency. The Writer will automagically enter recovery mode if comms can't be initialised.

It can take more than 20 attempts before the ECU will go into recovery mode. Don't worry if it doesn't happen immediately.

Thanks for this tip. I will give it a few thousand attempts. I work IT and this makes complete sense as I have seen this with various network appliances and PC'.

As for the disconnecting the battery, no change. I did find on the internet a picture of the internals of the ECU showing a reset button, but I am not at the point/deperate enough to open her up. Easy option is to buy another.....and another........and another.......

20 years ago this would have ruined my week if not the whole month.I think I was pissed off about it for about 10 mins, just another thing to through some money at to fix it.

Thanks for the replies guys.

[Moparnut72]

Yeah, I get it, resistor between the disconnected battery terminals to bleed of any capacitors or whatever the suggested methods can be.

It was the way it read to tie the positive and negative together and idle for 13 minutes. I know what was meant it was just a wait… what moment.

I didn't think I had to go step by step. Members here don't need that. MG has been turning riders into mechanics for over a hundred years, I think we all have it together by now.    Sorry I don't proof read everything I write now, haven't been graded on my work for a long time.
kk

[GuzziOrDeath]

No amount of connecting the battery cables together, leaving the key on, holding the brake lever, throat singing, chicken sacrifice, swearing, maniacal laughter, or any other suggestion here will fix a bricked 7SM ECU.

If the software recovery doesn't wake it up, reach for your wallet...

[Shiny Hat]

I didn't think I had to go step by step. Members here don't need that. MG has been turning riders into mechanics for over a hundred years, I think we all have it together by now.    Sorry I don't proof read everything I write now, haven't been graded on my work for a long time.
kk

You don’t have to apologize, I don’t expect much.
I was not criticizing your post it was more on me when I said a quick read was a wait… what moment for ME.
But since you brought it up, not everyone is familiar with procedures so maybe some won’t realize there was a piece missing.
I don’t just want to know what, but also want to know why. That is something that is not explained very well here.
Common responses to electrical issues show that. Check battery voltage, why, what will that tell you? Check the charging system, it should be 14.2 volts, why. Is 13.5 not good, if not, why?
I don’t believe those questions to be trolling or argumentative. I see the responses a lot and want to know if they are just repeated advice or an actual reason behind them.

On a non serious note, that’s a great marketing slogan for MG. “We’ve been turning riders into mechanics for over 100 years” That is gold and I will steal it and have it on a tee shirt.

[Moparnut72]

I do doubt that the + and - cables being connected is going to work in this case but it will reset some things that went somewhat haywire. The making mechanics isn't mine, it is a commonly used expression within the Guzzzi clan. 
kk

[Zenermaniac]

When my V9 ECU got bricked, no amount of hocus pocus would revive it. Different model but still Marelli. I worked in electronics for 45+ years and most systems have a recovery mode or some way of “going back to zero” and restarting. Apparently Marelli ECUs lack that sophistication. Either that or GD doesn’t have communication error correction algorithms. One wrong bit in the stream and the show is over. My only solution was a new ECU. Sucks.

[Bulldog9]

Haven't read the thread, but have you reached out to Mark at GRiSO.org?

[Chuck in Indiana]

Here's the story:
Many years ago, when WG hadn't splintered into various forums, Ed Milich proposed getting Mark Ethridge a tatoo for his birthday. I said, "How about the Guzzi oval with the eagle, and around the top Making mechanics out of riders.. and on the bottom, Since 1921."
People either loved it or hated it, but it has withstood the test of time. 
Later on, Kiwi Roy said, "Moto Guzzi.. Making electricians out of riders since 1921."
Both have been made into T shirts for years..

[averb]

Haven't read the thread, but have you reached out to Mark at GRiSO.org?

Mark has already posted a reply above

[Ed / AF1 Racing]

one trick I know of on the Aprilia 7SM and using GD is to go into the GD writer,

go in and start to write a new map to the bricked ECU...pick any map, doesnt matter

The trick is to ignore the key on, off instructions.  Have the key off, until after you start the writing process (after clicking all the oks to start it).   Then turn on the key, and that seems to connect to the ECU in boot mode right when it gets power, and starts a fresh delete and re-loading of the map.  A fresh full reload is all it needs to be fixed.

[GuzziOrDeath]

I can confirm what Ed says. Just need to get your timing right.

[gomesnz]

Thanks Ed and Guzzi of death.

I will give the key off and then on, when writing starts ago. This sounds like it might take more than a few goes.

For the record, priced up a ECU from my MG dealer, 6-10 weeks to ship to NZ. Price was $1200 NZD. Thats about $760 USD. So that is going to be plan B, and it was much cheaper than I expected. Wonder what map it comes with?

I am guessing there will be some hooks that I have to take it to the dealer for the first map to be loaded.......wouldn't surprise me.

Moto Guzzi, making mechanics, auto electricians and ECU tuners every day!!

Still love em.

[Zenermaniac]

I am guessing there will be some hooks that I have to take it to the dealer for the first map to be loaded.......wouldn't surprise me.

When I replaced my V9 ECU the box was sealed and a map was already programmed so I assume they come from the factory pre-loaded.

[gomesnz]

Well the new ECU arrived the other day, after about 6 weeks travelling all the way from the other side of the world. I have the old one to play with.

Installed the new ECU, and immediately the dash alarms with MGCT disabled. Download the map and its the standard EU map, which was disappointing. Starts up but still has that error. So I blew in my new map all good. Started up and went for a ride to set the MGCT calibration. However the engine is in some sort of limp mode, engine is idling at 2000rpm, no throttle, speedo is uncalibrated and reads crazy numbers a ton of flashing lights on the dash.

So does anyone have experience about how to calibrate and initialise the new ECU?

Thinking its a trip to the dealer. Sigh.

[pauldaytona]

I just see this thread. when the writer tries to write and can't make a connection  to the ecu it goes to recovery mode. You follow the on screen prompts. You do use the latest writer?
You did pay to much for an ecu. You could have used any 7sm with hw 320. Like from the newer RSV4/ TuonoV4 (2017-2020) euro 4 they come up for sale for little money.

You did the handle and throttle learning and cleared all faults? No faults anymore?

[GuzziOrDeath]

Just for the record, five 7SM's were bricked. Three were recovered as per Paul's post. The fourth wasn't as the owner went in a different direction. I personally recovered three of them.

Recovery can take a few attempts. Sometimes more than 10.

One was bricked by using a "steam powered computer"* (owners words), and the others by using virtual Windows machines on Linux and Mac machines, which is an absolute no-no as per my instructions.

All failures were due to operator error or ignorance, not because of GuzziDiag. Anyone who says otherwise is wrong.




* Windows XP with all the wrong settings.

[pauldaytona]

I have written 60 times at least my own 7SM ecu. And I know that hundreds(maybe more than 1000) of Aprilia RSV4 / Tuono V4  with same ecu have done too. There were a few failures like children closing the laptop lid, cables that went loose, that all got recovered.