Incorrect ambient temperature on dash of MP3 400
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Piaggio MP3 400ie
Joined: 02 Sep 2012
Posts: 1
Location: Detroit, MI
Sun Sep 02, 2012 9:57 am quote
I have a 2009 MP3 400. The ambient temperature gauge on the dash is incorrect, usually about 8 - 10 degrees higher than the actual outside temperature.

Is there anything I can do besides replacing parts of the dash, which I am reluctant to do? Is this a common problem? Everything else seems to work.

I have noticed that after riding a bit, there is a lot of heat around the running lights. Could this be a contributing factor?
Molto Verboso
2007 Piaggio MP3 250 (sold) and 2009 MP3 400
Joined: 30 Jun 2010
Posts: 1842
Location: Floyds Knobs IN
Sun Sep 02, 2012 10:08 am quote
Everyone's does that due to the location of the temp sensor and the radiator. I haven't heard of a fix.
Molto Verboso
Piaggio mp3 500
Joined: 10 Oct 2010
Posts: 1295
Location: Longview,Texas 75604
Sun Sep 02, 2012 12:41 pm quote
the way I fixed it was to buy a small digital battery operated thermometer like you would use with the sensor on a long cord. roll up the cord and use some adhesive to mount it on the dashboard. It works very well!!
Molto Verboso
MP3 500 08
Joined: 08 Aug 2009
Posts: 1560
Location: Toms River area, New Jersey
Sun Sep 02, 2012 12:55 pm quote
Have a 500 mp3, but did relocate the sensor. Do not have a clue for the 400 to move.
Molto Verboso
2012 BV 350, 2013 BMW C650 GT, 2015 Indian Chieftain
Joined: 20 Feb 2009
Posts: 1874
Location: Brentwood, TN
Sun Sep 02, 2012 4:43 pm quote
Easy fix. Cheap too.
I read the dash and subtract about 8 - works every time, but I'm good with math.
Ossessionato
Scarabeo 500GT(hers), `07 250 MP3, `09 400 MP3
Joined: 13 Oct 2008
Posts: 2592
Location: Kingman, Az.
Sun Sep 02, 2012 5:23 pm quote
When you're riding down the road the MP3 is also registering heat off the pavement you're on. I find it accurate for the situation. Of course when you're MP3 is sitting out in the sun, it's going to read hotter until you get moving because the accurate ambient temp. is read in the shade if you're not moving.

Last edited by norCal Randy on Fri Sep 07, 2012 9:10 pm; edited 1 time in total
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21248
Location: Harriman, Tennessee, Tn
Sun Sep 02, 2012 5:57 pm quote
Re: Easy fix. Cheap too.
TN_Sooner wrote:
I read the dash and subtract about 8 - works every time, but I'm good with math.
this is the fastest and easist fix for sure. also I do the same for the speedo error as well.
Molto Verboso
2009 MP3 400ie, Silver- "Lorelei Lee Long"
Joined: 21 Nov 2011
Posts: 1066
Location: Louisville, KY
Sun Sep 02, 2012 8:36 pm quote
If you ever have the plastic off to where you can reach it, reloacing the sensor helps, though it will still be slightly off to to radiant heat from the road. I moved mine down and out a fair bit so it is much more out of line from the radiator.
Member
Blue MP3 400 - 2012
Joined: 13 May 2013
Posts: 8
Location: Idaho
Tue May 14, 2013 8:42 am quote
I've actually fixed this on my MP3-400 and find that the temperature is now right on - every time. It is an easy fix. I simply relocated the ambient temperature probe from where is sticks out of the firewall immediatly behind the rider's front right wheel to the knee plate on the left in a protected, shady corner. I now get very accurate readings that are not affected by pavement heat or radiator heat. I'm very pleased.
Member
Blue MP3 400 - 2012
Joined: 13 May 2013
Posts: 8
Location: Idaho
Tue May 14, 2013 8:50 am quote
If anyone is interested, I can post photos of the relocation site.
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 21445
Location: Palatka, Florida
Tue May 14, 2013 11:28 am quote
Most definitely interested to see pics.
Member
Blue MP3 400 - 2012
Joined: 13 May 2013
Posts: 8
Location: Idaho
Tue May 14, 2013 1:52 pm quote
The location is in the left corner of the knee-wall. It is placed where your feet or knees will not bump it. I have found it to be spot-on accurate.

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3.jpg

Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 21445
Location: Palatka, Florida
Wed May 15, 2013 6:05 am quote
Don't really dig the screw coming through the leg shield but good to know that location gives more accurate readings.
Member
Blue MP3 400 - 2012
Joined: 13 May 2013
Posts: 8
Location: Idaho
Wed May 15, 2013 7:00 am quote
The reality is that you don't see it. (It wasn't until I really zoomed in on it that you could see it in the photos.) What's funny is that I take my kids on rides all the time and not one of them has seen it yet. (I haven't said anything to them to see how long it takes them to notice.) I agonized for months over whether or not to relocated the probe because I shared your concerns. But now that I've done it, I'm really, really glad.

Now, if only there was a speedomter probe that I could move...
Hooked
Black MP3 250, 2007
Joined: 03 Jun 2011
Posts: 190
Location: Idaho
Wed May 15, 2013 7:17 am quote
IdahoScooterDad wrote:
The reality is that you don't see it. (It wasn't until I really zoomed in on it that you could see it in the photos.) What's funny is that I take my kids on rides all the time and not one of them has seen it yet. (I haven't said anything to them to see how long it takes them to notice.) I agonized for months over whether or not to relocated the probe because I shared your concerns. But now that I've done it, I'm really, really glad.

Now, if only there was a speedomter probe that I could move...
For the speedometer question, maybe we just need to switch the speed sensor cables from the left to the right (each wheel has a speed sensor, one for the speedometer and one for the tilt lock up). Who knows, maybe the other sensor puts out pulses differently? Though I doubt it
Molto Verboso
MP3 500
Joined: 20 Apr 2008
Posts: 1291
Location: Utah
Wed May 15, 2013 8:32 am quote
IdahoScooterDad wrote:
(It wasn't until I really zoomed in on it that you could see it in the photos.)
Will this do?

Up close.jpg

Ossessionato
2009 MP3 400
Joined: 27 Jul 2008
Posts: 2004
Location: Saratoga, N.Y.
Wed May 15, 2013 9:43 am quote
IdahoScooterDad, do you have a photo of the sensor in its stock location? How was it held in place? Was the wire long enough to relocate it, or did you splice in an extension? Where it is now, does it just poke through from behind? If so, how is it secured?
Member
Blue MP3 400 - 2012
Joined: 13 May 2013
Posts: 8
Location: Idaho
Wed May 15, 2013 10:19 am quote
I do not have a photo of the original location, although a fellow forum member (LikeARaptor) who owns a 250 will take a picture of his and post it, as they are in the same position as the 400. It is easy to spot, though. Stoop down and look under the front of the bike at the firewall immediately behind the front/right wheel assembly and you'll see it protruding from the firewall.

Basically what you are looking at in the photo is the probe itself sheathed in ribbed plastic. I drilled a hole smaller than the outer ribbing and then firmly pushed the probe through the hole. The ribbing holds it firmly in place with no need to secure it from behind. It was an extremely simple operation. (I know that from the photos it looks like a screw, but it is simply the black plastic ribbing around the probe that you are seeing.) I didn't have to splice or lengthen the wires at all. In fact I actually have a little bit of slack on the wire in its relocated position.

In the spirit of full disclosure, you need to be aware that to be able to access the probe and wires between the knee plate (the large plastic sheild piece surrounding your parking brake lever) and the plastic shield (that I referred to as the firewall) immediately behind the front wheels, you will have to remove the firewall shield. In order to do that there are a couple of screws that are hard to reach right at the top of the shield. They only have 1.5 inches of clearance and it isn't possible to get a screwdriver or standard sized rachet and bit up in there to get them out. You will need a micro-rachet and phillips bit that is no more than an inch in depth in order to get those screws out enough that you can then turn them the rest of the way out with needle-nosed pliers. In addition, you will need to remove the knee plate as well so that you can drill a hole through it. (Once the front firewall shield is off, then the knee plate piece is easy to remove.)

If you have any questions about this dissembly process, I'd be happy to respond.
Hooked
Black MP3 250, 2007
Joined: 03 Jun 2011
Posts: 190
Location: Idaho
Wed May 15, 2013 10:23 am quote
ramblerdan wrote:
IdahoScooterDad, do you have a photo of the sensor in its stock location? How was it held in place? Was the wire long enough to relocate it, or did you splice in an extension? Where it is now, does it just poke through from behind? If so, how is it secured?
Here is where it is on the stock 250, I assume it is the same for the 400. This is on the right hand side when sitting on the scooter, or the left hand side when looking at it from the front.

Sensor.jpg

Ossessionato
2009 MP3 500 - The Iridescent Chameleon, 2007 Yamaha Vino 125, 2016 Indian Scout Sixty
Joined: 18 Jun 2010
Posts: 2651
Location: Geneseo, IL (Quad City area)
Wed May 15, 2013 1:40 pm quote
stickyfrog wrote:
Don't really dig the screw coming through the leg shield but good to know that location gives more accurate readings.
That's not a screw. That's the covering for the sensor. It's a ribbed plastic plug. It's the same on the 500, as well.
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 21445
Location: Palatka, Florida
Wed May 15, 2013 4:01 pm quote
CubsKing99 wrote:
stickyfrog wrote:
Don't really dig the screw coming through the leg shield but good to know that location gives more accurate readings.
That's not a screw. That's the covering for the sensor. It's a ribbed plastic plug. It's the same on the 500, as well.
Yeah I didn't realize that at first. Still looks like a screw sticking out of the leg shield though.
Member
2013 MP3 300ie, 2010 Kymco Agility
Joined: 24 Nov 2017
Posts: 40
Location: Netherlands
Thu Feb 14, 2019 12:55 pm quote
(Old thread, I know...)

Today I moved the temperature sensor on my MP3 the lazy way (AKA The Right Way in my book )

I discovered the back of the sensor, including the wiring, can be reached through the small inspection hatch by your right foot.

It will pop out of the panel by pressing it from the wheel well with the back of a screwdriver.

I drilled a hole (6.5mm) near the edge of the inspection hatch and pushed the sensor through from the inside.

For now I only pushed it part of the way because it looks better like that, but if it appears to measure the temperature behind the tupperware more than the outside temperature, I can still push it all the way through.

5 minute job.

Not sure if the readings will be completely correct now, but the sensor is not in the airflow behind the radiator anymore, so I expect at least some improvement - especially in winter, when heat from the radiator would prevent reliable detection of freezing conditions (my biggest frustration with the original setup)..

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Ossessionato
2016 MP3/500 Sport ABS, 2009 MP3/250, 2012 GTS Super 300ie
Joined: 08 Jul 2011
Posts: 4193
Location: Marietta, GA
Mon Feb 18, 2019 11:35 am quote
Re: Incorrect ambient temperature on dash of MP3 400
Bruce Ewen wrote:
I have a 2009 MP3 400. The ambient temperature gauge on the dash is incorrect, usually about 8 - 10 degrees higher than the actual outside temperature.

Is there anything I can do besides replacing parts of the dash, which I am reluctant to do? Is this a common problem? Everything else seems to work.

I have noticed that after riding a bit, there is a lot of heat around the running lights. Could this be a contributing factor?
Your sensor is in the front fender well.
On the Newer MP3/500's, they moved it to the Steering column which makes it way more accurate. On my MP3/250, I have seen it in the summer go over 100+, so your right. I don't make much attention to it on that bike.

One thing I do like to be aware of is the Oil Temperature. Especially on the 500... UhUm... Scooterpartsco.com has nice dip stick replacements for 250/300 and 400/500 models.

Keith,
Marietta, GA
Land of 10,000 Scoots Rally   vespa scooterwest scooter west Motorsport Scooters   Yelcome Leather Top Cases and Roll Bags for Piaggio Vespa PX LX LXV GTS GTV
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