[Ducati] Starting problems - update

[Bob Marren]

John Sheerin wrote:

>Hi guys,
>Thanks for all the tips.  I thought it would be the fuel pump, since I could
>hear relays clicking, had voltage at the pump connector, but the pump would
>only turn on 1/3 of the time.  But last night I connected 12V straight to
>the pump connector, and the pump ran every time.  So then I looked at the
>two engine management relays, the big 30A Bosch ones that sit under the
>tail, right in front of the ECU.  Pulled them, they looked fine, tested them
>with 12V on the control coil, they clicked and made contact on the switched
>connections every time.  So I put them back in, hooked up the fuel pump
>wiring, and tried the key.  The first time, nothing.  Every time after that,
>the pump ran fine.  I didn't try starting, as it was really late.  I'll try
>that tonight and see how it goes.  Seems like an electrical gremlin at this
>point - something is maybe marginally bad, like a wire or something.
>
>Btw, you guys were mentioning injector relays.  What are injector relays?  I
>don't see any of those on the wiring diagram I have.
>
>Thanks,
>John
>http://ldsg.snippets.org/HORNS/
>
>
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>
I am not real sure about the Ducati ECU but on american autos the fuel 
pump it turned on for several
seconds when the key is first turned on then when the engine starts the 
oil pressure sensor needs to
have an output to the ECU or the engine shuts down. We do have an oil 
pressure switch and I dont
have my schematic with me but some of the replies where the owners 
report that the bike shuts down
leaving a gas station an such could be oil pressure related or a faulty 
switch. Just a thought.
 Bob M