Mon Jul 02, 2018 6:23 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 6:23 am linkquote
Hello,

I have a mp3 500 sport from 2012, 12000 miles

On my way to work last week i was cruising at 60mph then sudently engine stopped in heavy traffic.

So i manage to park on the side of the road, then i search for service manual on my phone, then i started looking for fuse boxes. I found fuse number 10 7,5A was burned. Fuse box on my left foot.

So i took out fuse number 9 7,5A (so i lost my horn) to replace fuse number 10 and engine starts up at first try.

Then i had no problem for one week long, with 100 miles / day. i thought fuse was probably faulty, because i saw a little corrosion in the footwell fuse box.

Then yesterday morning, same thing happened again after 10 miles on highway at normal speed. Fuse number 10 burned.

fuse 10:Protected circuits:Live injection ECU, immobilizer aer-
ial, electric fan remote control, injection load remote control


So i changed it again, BUT now it burns instantly when i turn the key on. i change it a second time. It burns when i turn the key.

So i think i have a shortcut somewhere, but not all the time because i drove one week with no problem. My MP3 is a bit old (2012) but not many miles. It's 100% stock with no mods.

Could anyone tell me if this is known issue or if i could check something easy before removing ALL plastic covers to look for faulty wire.

Thank you
Mon Jul 02, 2018 6:26 am

Ossessionato
2016 MP3/500 Sport ABS, 2009 MP3/250, 2012 GTS Super 300ie
Joined: 08 Jul 2011
Posts: 4295
Location: Marietta, GA
 
Ossessionato
2016 MP3/500 Sport ABS, 2009 MP3/250, 2012 GTS Super 300ie
Joined: 08 Jul 2011
Posts: 4295
Location: Marietta, GA
Mon Jul 02, 2018 6:26 am linkquote
Have you done any Recent Modifications to your Bike that may have introduced the Electrical Problem ?

If so, revisit what you did for any possible shorts.

Keith,
Marietta, GA
Mon Jul 02, 2018 6:47 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 6:47 am linkquote
No modification at all. 100% stock.
Mon Jul 02, 2018 6:57 am

Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
 
Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
Mon Jul 02, 2018 6:57 am linkquote
If no modifications, then you most definitely have a short circuit somewhere. Unfortunately finding it will likely require removal of the plastics.

Here's what I would do-

First, download a wiring diagram. That way you'll know the colors of the wires that could have a problem.

Then, find a multimeter that can measure ohms with a beep for short circuit. Then, remove the battery cables, and stick one end of the multimeter probe into the fuse socket and the other end to ground. There should be a steady beep.

Then I would wiggle any wire harnesses I can easily get to, and see if the beep stops. If it stops, then the short is somewhere near where I wiggled the wires.

If the beep continues, I'd just remove one plastic panel at a time, wiggling any wires, and checking near where you were wiggling when the beep stops, removing the connectors to any of the fused components- (like the fan relay and the ECU) to see if that stops the beep. Any component that stops the beep could be bad as well.

Good luck!
Mon Jul 02, 2018 8:04 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 8:04 am linkquote
Thanks so i disconnected the battery and checked for continuity.

I was happy to find some continuity between one side of fuse number 10 socket and front fork.
But then i test some other sockets and found some ohms too in fuse 12 and 9.

These fuses are ok so i suppose continuity is normal for some sockets OR all my wire is messed up?
Mon Jul 02, 2018 8:14 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 8:14 am linkquote
is it possible for relay for example the injection remote relay to be the cause of short circuit?
Is it behind dashbord? i think i saw a picture somewhere
Mon Jul 02, 2018 8:38 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 8:38 am linkquote
I don't know if it's related, but recently i found kill switch is becoming hard to push.

I always use the kill switch to stop the engine, then i turn key in off position.
Don't know if it 's a good or bad habit.

A bad kill switch can cause short circuit in fuse number 10?
Mon Jul 02, 2018 9:09 am

Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
 
Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
Mon Jul 02, 2018 9:09 am linkquote
Some continuity is normal. To blow a 7.5 amp fuse you need less than 2 ohms at 12 volts. A short circuit will probably measure less than an ohm. But I would remove the suspect fuse and measure from the "cold" side (not the battery side) to ground. If it's blowing the fuse immediately, that should be less than 2 ohms.

The other fuses will measure considerably higher. Maybe 100 ohms?

I doubt it's the problem, but to check if the kill switch is bad, just unplug the handlebar connector and see if the resistance goes up.
Mon Jul 02, 2018 3:13 pm

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 3:13 pm linkquote
Ok i found the problem
Wire was rubbing against engine

I have to put some more tape around wires



Mon Jul 02, 2018 3:16 pm

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 3:16 pm linkquote
Closer



Mon Jul 02, 2018 3:18 pm

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 3:18 pm linkquote
Before



Mon Jul 02, 2018 3:21 pm

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 3:21 pm linkquote
Then when you start up again ,if it happens to you be careful. Cylinder was full of gasoline. Spilling from exhaust
I had to remove sparkplug to drain the swamp



Mon Jul 02, 2018 3:23 pm

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 3:23 pm linkquote
Anyway, now it s running like a clock. I will do oil and filter change because oil smells gasoline
Thanks for your help
Mon Jul 02, 2018 3:40 pm

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Mon Jul 02, 2018 3:40 pm linkquote
Check yours



Tue Jul 03, 2018 5:43 am

Ossessionato
2016 MP3/500 Sport ABS, 2009 MP3/250, 2012 GTS Super 300ie
Joined: 08 Jul 2011
Posts: 4295
Location: Marietta, GA
 
Ossessionato
2016 MP3/500 Sport ABS, 2009 MP3/250, 2012 GTS Super 300ie
Joined: 08 Jul 2011
Posts: 4295
Location: Marietta, GA
Tue Jul 03, 2018 5:43 am linkquote
Ouch...
I need to check that !

I have two friends who had there Vespa GTS catch on fire under the Seat.
Piaggio/Vespa does not do a very good job of insulating the wire harness.
I didn't think the MP3 had an issue until I seen these pictures.

I wonder if this is a victim from a Mod that was done vs stock?
Just curious.

Keith,
Marietta, GA
Tue Jul 03, 2018 6:53 am

Enthusiast
MP3
Joined: 15 Jun 2018
Posts: 87
Location: Atlanta Ga
 
Enthusiast
MP3
Joined: 15 Jun 2018
Posts: 87
Location: Atlanta Ga
Tue Jul 03, 2018 6:53 am linkquote
Glad you found the problem. The first thing I do is crawl under the machine and look everywhere for problems. My new 18 500 looked good except one hose by the roll lock came out of its harness and was rubbing on the plate.

Mike
Tue Jul 03, 2018 7:08 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Tue Jul 03, 2018 7:08 am linkquote
Yes no mods at all.
Red and white wire was half cut.
i think that shortcut locked the ECU and injector in full throtle because cylinder and half exhaust was full of gasoline.
Thu Jul 05, 2018 6:49 am

Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
 
Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
Thu Jul 05, 2018 6:49 am linkquote
Great job:
1) finding the problem
2) not bending your connecting rod with a cylinder full of gas.

I notice that the clip that should be screwed to the top of the throttle body is undone, and it looks like the screw is missing and has been for a long time. That clip would have prevented the wire from chafing. Did you have somebody work on it a few years ago or did it come from the factory that way? Anyway, great job finding it and I would screw down that clip to hold the wiring harness away from the throttle body after insulating it.
Fri Jul 06, 2018 9:34 am

Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
 
Member
MP3 500 2012
Joined: 02 Jul 2018
Posts: 14
Location: Paris
Fri Jul 06, 2018 9:34 am linkquote
Yes was very happy to find the problem just by shaking wire harnesses and ohm meter.

No the screw was there before. I removed it before the picture.
The scooter is totaly stock i bought it with 5000 miles and never see dealer since that. Its now 20000km ithink about 12000 miles. Not a lot
Fri Jul 06, 2018 10:35 am

Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
 
Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 303
Location: Austin, TX
Fri Jul 06, 2018 10:35 am linkquote
Wow, if it was screwed down and clamped, then I better check my scooter for the same problem! Thanks!
Fri Jul 06, 2018 1:01 pm

Enthusiast
MP3
Joined: 15 Jun 2018
Posts: 87
Location: Atlanta Ga
 
Enthusiast
MP3
Joined: 15 Jun 2018
Posts: 87
Location: Atlanta Ga
Fri Jul 06, 2018 1:01 pm linkquote
Nice find Callahan congrats good thing it was open and visible.

Mike
Sat May 08, 2021 2:22 pm

Member
Piggio MP3 300 LT
Joined: 12 Feb 2021
Posts: 12
Location: Slovenia, Ljubljana
 
Member
Piggio MP3 300 LT
Joined: 12 Feb 2021
Posts: 12
Location: Slovenia, Ljubljana
Sat May 08, 2021 2:22 pm linkquote
Hi

I know it is old topic but anyway. Today I went for a ride 420km. 15km before I got home the bike started acting strange. The light on dashborad started fading, then I pressed turn light it got crazyer needle on the counter for rmps started jumping up and down all sort of lights come up. So I slow down and then gave a full throttle everything was ok, after minut it was same. Does anybody have any ideas, where to look for a solution to this problem.
Bike is Piaggio Mp3 300Lt.

Thank you.

Alen

Problem was, on cable on battery (-) got loose. Thank you.
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