2003 M620 will only start when jumping solenoid...why? - Ducati Monster Forums: Ducati Monster Motorcycle Forum
 
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post #1 of 6 (permalink) Old 08-16-2019, 03:33 PM Thread Starter
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2003 M620 will only start when jumping solenoid...why?

Hi all, I'm new to this forum and potentially will be a Ducati owner soon!

I'm looking at buying a 2003 Monster 620 used that's a bit rough. It's been dropped, with tank dented but I'm thinking of getting it for a project. The owner says at some point, he thinks he 'fried' the ECU and now the bike only starts with key in ignition and "ON" when he jumps the starter solenoid with a wire. I've witnessed this. He does not have the red key anymore and cannot reprogram the ECU.

My question is, is this going to be a big headache for me moving forward if I get the bike? I've read many threads about reprogramming the ECU to disable the immobilizer but I would like to keep it if possible and also not have to pay a ton to reprogram the ECU. If the ECU is in fact fried, I'm not sure if it can be reprogrammed. It the ECU was fried, would the bike still run normally? I was only able to test ride the bike in a an alleyway, getting into second so I could not really tell if there was a fuel mapping issue or anything like that. I've also read that there's a way to wire the bike permanently the bypass the immobilizer? Is that possible?

Finally, is it possible that it's not an immobilizer issue and the ECU isn't fried? Ie., Could it just require replacing the starter solenoid? I'm not exactly sure how the solenoid works with the immobilizer...

Any help would be appreciated. I'm trying to figure out how much I should budget for fixing this issue and whether it's worth it. Thanks in advance!

P.S. Should I post this to the Monster thread instead?
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post #2 of 6 (permalink) Old 08-16-2019, 05:35 PM
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I've started cars this way when the alarm went haywire....if it runs at all the ECU is probably fine...but the immobilizer is definitely being triggered...I'm only here to point you in a direction...I have no solution

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post #3 of 6 (permalink) Old 08-17-2019, 04:35 PM
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I believe if you jumper across the 2 connectors on the solenoid and it cranks and starts, that means the solenoid is bad.
Check that theory before you spend money though.
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post #4 of 6 (permalink) Old 08-20-2019, 12:53 PM
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Sooo... My 02 M620 had a similar issue. I went through everything, solenoid, starter motor, connections... Turns out it WAS the output on the ECU. Its apparently a somewhat recognized issue where the ECU output was only intended for resistive loads, NOT inductive loads [like a solenoid], and will eventually fry the output. Fortunately it doesn't seem to do any other internal damage. My workaround after a year of bump starting was to wire the start button directly to the starter solenoid. That preserved the immobilizer, BUT that also means that it will crank [but not start] if immobilizer is triggered, AND/OR when the stand is down.

YMMV. If you do decide you need a working starter motor though, I now have one I'd be happy to sell

Daniel

'02 M620 Darkenstein
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post #5 of 6 (permalink) Old 09-05-2019, 01:01 PM Thread Starter
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Thanks for all the input! I feel like I'm a bit more "reassured" now that it appears to be a problem that other people have experienced. I'll still have to do some diagnosing to figure it out but at least there sounds to be some potential solutions.
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post #6 of 6 (permalink) Old 09-06-2019, 07:24 PM
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Still fiddling with it? If you try what I suggested in post 3, be ready for sparks.
You can do it, git 'er done. Go ride.
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