Mechanism

When I bought it 8 years ago, the bike looked like it had been under water. So I'm not surprised to say the least. What is surprising, is that the corrosion forms an edge exactly on a quarter if the print. As if it was physically dipped in water. I started her up yesterday evening and she runs like a sewing machine again. Very happy!

You mean the second one from top left? It's the one I had my doubts about.. But the print burnt off so I have no idea what It's supposed to be.

To clean the PCB I used Isopropyl alcohol, a very soft toothbrush and before everything dries a modest rinse with demineralized water (to move all that oxidation residue off). Then make sure the board is completely dry before testing.

After a good clean, we can see the components have not actually been burnt, but they've been hot. I connected the board to the bike very carefully and finally, the fuelpump primes again and there is power to the coils as well. Now to stick everything back together and hope it will keep working!

But after turning it over, I noticed a bunch of oxidation connecting the traces on the board. The components close to the corner have been visibly hot because of this.

I hope this serves someone in the future, as the forum has served me for years. After removal of the ECU lid we see a nice clean print:

Sooo guess what.. I put the ECU in the oven for an hour at 100 degrees C. Took it apart, cleaned the entire (heavily oxidated) print with Isopropyl alcohol and dried it. Connected the bare print to the loom, ignition on... > priming procedure > power to coils! Yesyesyesyes! Now to reassemble everything and hope it's not a case of 'intermittent ECU'. Will post some 2x4 pixel pictures of this endeavour as soon as possible 😁

I have been a naughty boy and took the ECU apart. I'll start with a much needed cleaning and then hope we have some PCB experts here that know what components have been fried due to oxidation between the traces. Once again: I greatly appreciate all the help!

It was running great at the first startup after winter. One week later I'm getting ready for my first actual ride of the year, no fuel and spark. Bike has not moved an inch in between. I may have to start a seperate topic alltogether. As far as I know, all IAW 15M ECU's are interchangeable, as long as you put the V11 software / mapping on it (which I can't, because I hate programming stuff). But if that's true I can get a Ducati 15M ECU for small change, in stead of the exact right V11 one for a sh*tload of money.. And then find someone that can flash a V11 map on it.

I ran out of time. Hope to test the rest of the ECU plug shortly. Might as well start looking for a fresh ECU. They are few and expensive out here. And then there is the issue that nearly no setting was original on the current ECU. Expecting a long road to the V11 getting it's roar back.

Pin 19 to ground makes the relay switch and turns on the fuelpump. Starting to dread a failed ECU.. 😐 My compliments for your stellar support so far. This is incredibly helpfull, kudos mate.

The fuse feeds #4 with a white/green wire. The second prong is two brown/white wires, one leading to relay #5, the other into the loom. When I turn the ignition on, relay #4 switches and sends power to prong #2, the brown/white wire on relay #5 is energized, but #5 does not switch. I switched the (new) relays around and the issue stays the same.

This took some time because relays and fuses are not in the same order as in a standard V11: Yes, when I connect the top prong (blue wire) with the second prong (red), the fuelpump runs.

I have 2: One is a combined trickle charger and PSU 12 or 24V, 4 amps (for component testing and stuff) the other 12V 300 amps peak. If you overload they just cut out, no risk of BBQ. They are made by the French company GYS by the way.

As a vintage vehicle enthousiast, it was my first thought. So any testing is done without battery. I connect a PSU directly to the terminals when troubleshooting. Stable, regulated. I actually love this Forum, but I never really needed it for a specific question😉