Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 999 / 749 > 999S won't start - error 37.3?

[chrisw]

Whenever there are electrical gremlins with my 999 the first thing I change is the injector/coil/pump relay. It's found on the back of the battery box, behind the heat shield and below the starter relay. You need a 12v 4 pin micro relay.

[DRR007]

Well after an eventful 2 days in the garage trying to trace the fault it appears I have a dead cell in my battery. The battery reads a good 13.05 volts but as soon as it's off the trickle charger the volts drop one by one. The bike started without the atenna ring attached which leads me to believe the immobiliser has been bypasses somehow and the 37.3 code is telling me the immobiliser is off in effect.

Got my new antenna on this morning but sadly the bike didn't start

Anyway after a conversation with Ducati John, a new battery and a couple of 12v 4 pin new relays (as my DUCATI was using MG ROVER 5 pin relays!) and she's fired up without hesitation.

Just to confirm the battery was changed first and the bike worked. The relays were swapped out after, not that they are faulty however... Well they say MG ROVER on them so it's only a matter of time before they melt!

Thanks for all the help guys!

[chrisw]

Glad it's sorted. I'll add dead cells to my list of fault causes.

[antonye]

Wow, red herring with the immobiliser code!
Always good to change the relays. The 4 pin and 5 pin are the same unit internally but the extra pin allows you to have both ON and OFF wired rather than just ON.