MP3 250 fan running
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Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Mon Jan 04, 2021 12:36 pm quote
Hi all and a happy new year

New year and a new issue with my MP3. Seem that my fan will not shut off. Even when I switch the bike off the fan still runs. I have to pull the fuse or unhook the battery. The temp have been good here mainly in the 60Fís. I checked and added coolant but no joy. It happened about 8 months again also but stopped after not riding it and leaving the fuse out for a few days.

Temp on the screen is at most 3 bars maybe 4. Sensor issues electrical wire touching the frame? Any ideas
Thanks
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39239
Location: Pleasant Hill, CA
Mon Jan 04, 2021 12:51 pm quote
There are two temp sensors in the same package. One feeds the ecu, which then controls the 'grounding' of the fan relay. The other just feeds the gauge.

The first step is to swap out the relay, which might have welded contacts. I think this is unusual, but at least it's free and easy to do! If that isn't it, check the resistance to ground of the sensor wires at the ecu connector, and at the dashboard. The wiring diagram has the details:
https://manuals.wotmeworry.org.uk/Piaggio/Piaggio%20MP3/MP3%20250/
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21695
Location: Harriman, Tennessee, Tn
Tue Jan 05, 2021 4:11 pm quote
you might have an air bubble in the system not allowing coolant to properly flow.
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Wed Jan 06, 2021 8:27 am quote
I hope that is the issue. I am flushing the coolant now and will see if that will cause the issue to cease!

In case thats not gonna resolve (and I think it wont) Where is the location of the Electric Fan relay? Looked on the wiring diagram and cant located it on the bike!

I also can see where a wire would be touching the frame, checked the usual places.

HELP
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Wed Jan 06, 2021 8:29 am quote
I am assuming its the quad relays under the windshield?
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39239
Location: Pleasant Hill, CA
Wed Jan 06, 2021 8:59 am quote
old as dirt wrote:
you might have an air bubble in the system not allowing coolant to properly flow.
In which case the gauge would be spiking as well. So unlikely.
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Wed Jan 06, 2021 9:41 am quote
So I pulled the relays and obviously the fan went off.

I have put them back in and now nothing, Fan does not come on but the scoot wont start now, not even a try, i pushed the starting button and get nothing not even a sound
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1178
Location: Toronto
Wed Jan 06, 2021 1:19 pm quote
This sounds like an electrical fault. Maybe you blew a fuse now and that's why it won't start anymore?

Maybe I misunderstood, but your first post reads as though the fan is always on. So as soon as you turn on the bike it come on immediately, even though the bike is cold, Is that right?

If so, I'd say that reinforces an electrical problem because an actual coolant problem would still need a few minutes to heat up enough to trigger the fan.
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Wed Jan 06, 2021 1:30 pm quote
Hey Berto.

Yeah itís certainly an electrical issue.

The issue is/was that the fan is constantly running without the bike being turned on or started. Itís would only switch of when pulling the fuse or unhooking the battery.

Fast forward to where i am at now. I pulled the relays and as I said the fan went off. Inspection of the relays is that they are corroded. When I put them back in the lights and horn all seem fine and the fan does not come on. The problem now is that when I attempt to start the bike absolutely nothing happens. Does not even try. Seems like itís dead. The dash all lights up and the brake lights work I have disconnected the kill switch too. Still nothing. I have ordered new relays. As this to me seems to be where the not starting issue began. I am picking one up from autozone shortly but will look to replace them all.
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Wed Jan 06, 2021 4:05 pm quote
Okay so I managed to pick up 2 new relays. Put them in and still nothing. Iíll wait for the rest to arrive and have them all replaced.

How this has gone from the fan issue to not starting has me stumped. Like I said does not even attempt to start.

At a loss.
Member
MP3
Joined: 12 Dec 2020
Posts: 12
Location: Sydney Australia
Wed Jan 06, 2021 10:03 pm quote
Must be something else. I am thinking also.
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1178
Location: Toronto
Thu Jan 07, 2021 6:49 am quote
A quick look at the wiring diagram jimc posted shows the starting circuit passing through a couple of fuses, and the brake lights. Did you confirm (by multimeter test) that your fuses are good? Did you confirm that brake lights come on when holding lever and trying to start bike?
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Fri Jan 08, 2021 10:36 am quote
I got my new relays and put them in but no joy on it starting. Multimeter shows all the fuses are fine, but I replaced them anyway. Brake light come on using both breaks.

Checked the relay connections and the all read low on the multimeter. But one of the relay ports is reading a lot higher than the rest.

To be honest this is not something I am understanding but seems not right. Itís the brown connector that the relay plugs into if thatís important
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1178
Location: Toronto
Fri Jan 08, 2021 6:54 pm quote
What's the immobilizer light doing through all this? Does it light up when you turn the key, and then go out and stay off?

Could it be something simple and unrelated like a kill switch in wrong position or a sidestand down?
rwelford wrote:
I got my new relays and put them in but no joy on it starting. Multimeter shows all the fuses are fine, but I replaced them anyway. Brake light come on using both breaks.
Sounds good (well, not the part that the relay didn't solve the start problem).
rwelford wrote:
Checked the relay connections and the all read low on the multimeter. But one of the relay ports is reading a lot higher than the rest.
When you say the relay connections "read low", can you elaborate how / what you are testing? And what do you mean about one port reading much higher? Are you measuring resistance to ground? Continuity?
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Sat Jan 09, 2021 9:01 am quote
The light is flashing, when I turn the key to on the light continues to flash.

What I don't hear is the fuel pump whurring up.

I had a new fuel pump about a year ago, but this was not the initial issue. The bike was starting no problem but the issue was the fan being on all the time regardless of the bike running.

All I have done is pull the 4 relays loads and since then the bike will turn on but nothing when I try to start, does not even attempt to start. On a positive the fan is no longer running.
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39239
Location: Pleasant Hill, CA
Sat Jan 09, 2021 11:01 am quote
rwelford wrote:
The light is flashing, when I turn the key to on the light continues to flash.
That then, is your elementary problem right there! No further diagnosis necessary! Either your ignition switch has failed or the connection to it has been disturbed - and as you've been in there to get to the relays I suspect the latter.

Check that before anything else.
Quote:
What I don't hear is the fuel pump whurring up.

I had a new fuel pump about a year ago, but this was not the initial issue. The bike was starting no problem but the issue was the fan being on all the time regardless of the bike running.

All I have done is pull the 4 relays loads and since then the bike will turn on but nothing when I try to start, does not even attempt to start. On a positive the fan is no longer running.
That obviously is NOT all that you have done. It may have been all you meant to do of course.
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Sat Jan 09, 2021 4:44 pm quote
Latest news is it up and running.

I took a chances and bought an new relay harness, this was that the last thing I was prepared to do. Removed one off the relay harness that was giving a irregular read out and plugged new relays in. Turned the key heard the fuel pump whurring and hit the start button. Bless the old girl she fired up first time.

Put all the panels back on (easier to come off thatís for sure) started it up again and runs fine. Will test ride tomorrow for a few miles to make sure everything checks out.

Thanks for everyoneís help. Itís much appreciated.
Member
MP3
Joined: 12 Dec 2020
Posts: 12
Location: Sydney Australia
Sat Jan 09, 2021 5:58 pm quote
Congratulations
Amazing

What was the part number or a photo of the relay harness , as I am sure it will happen to me 1 day

HaHaHaHa = 🎲 💨 💥 🎈🏁 ✅
Enthusiast
MP3 250
Joined: 11 Feb 2019
Posts: 87
Location: Palm Harbor, FL
Sun Jan 10, 2021 3:16 am quote
Nothing fancy. I got these just used one of them.

F0D4EF28-5714-451A-972A-592F0DDB3183.png

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 324
Location: Belgium
Sun Jan 10, 2021 3:54 am quote
Dollars to donuts the problem lies/lied in the relays vs. the harness.
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1178
Location: Toronto
Sun Jan 10, 2021 10:35 am quote
So now it starts up *and* the constant running fan problem is gone too? The immobilizer light also goes out and stays off as normal?

I'm glad you got it sorted!

But must admit I am confused how the relay would have prevented the immobilizer from recognizing key and turning off the indicator light.
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