Fri Jan 23, 2015 1:23 pm

Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
 
Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
Fri Jan 23, 2015 1:23 pm linkquote
On the way to work this morning my fan and check engine light turned on.

The temp was normal according to my gauge.

I let it cool down completely, started it, fan was on immediately for a minute with no CEL, stops and then after 10 minutes fan and CEL return.

It doesnt seem to be overheating, gauge only got to 2 bars.

Any insight on what may be happening here? I need to get home but not sure if its safe to ride...
Fri Jan 23, 2015 2:06 pm

Ossessionato
2013 Vespa 300 Super, 2022 Kymco AK 550
Joined: 30 Mar 2014
Posts: 2712
Location: Minneapolis USA
 
Ossessionato
2013 Vespa 300 Super, 2022 Kymco AK 550
Joined: 30 Mar 2014
Posts: 2712
Location: Minneapolis USA
Fri Jan 23, 2015 2:06 pm linkquote
Fan and Check Engine Lite
The Fan would indicate the engine is heating up.
I would be concerned about riding and causing
damage to what might be a cheap easy fix.

Coolant level could be low in the water pump
causing the Fan to run all the time. You should
be heating up. Fan with engine lite should make
you be cautious. Unless this is some crazy electrical
issue, you should be heating up. I would tow it
to the dealer.

Bob
Fri Jan 23, 2015 3:04 pm

Veni, Vidi, Posti
1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Posts: 6064
Location: Northants UK
 
Veni, Vidi, Posti
1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Posts: 6064
Location: Northants UK
Fri Jan 23, 2015 3:04 pm linkquote
Do a visual check of the cooling hoses, and check the small 'weep hole' at the bottom of the water pump for any drops of coolant. Check the coolant tank in the top right leg shield is full, and check the cap to see if there's anything unusual - it has a vent in it that needs to be ok.

If you've had major coolant loss, the coolant tank is dry etc, don't ride it - the engine can overheat and head gasket damage is likely.

You can remove the thermostat and check it's working in a hot pan of water - search here on MV or google it to find a 'how to'.

Let us know how you get on.
Fri Jan 23, 2015 3:49 pm

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41403
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41403
Location: Pleasant Hill, CA
Fri Jan 23, 2015 3:49 pm linkquote
A connection has probably fallen off one of the temperature sensors. There are two, in one unit. One feeds the ECU (and switches on the fan if hot) the other just feeds the temperature gauge. Easy test - swap the two connections. If your temp gauge shows very hot, but the fan and CEL behave, then you have a bad sensor rather than a duff connection - but a duff connection is by far the more likely fault.

It *isn't* a thermostat fault, or a show-stopper problem.
Fri Jan 23, 2015 4:12 pm

Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
 
Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
Fri Jan 23, 2015 4:12 pm linkquote
Thanks all - I think its the stat, thew it in a cup of boiling water and no open. Leaving the scoot at work, will investigate further and update later.

And thats some good troubleshooting info Jimc...
Fri Jan 23, 2015 6:12 pm

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41403
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41403
Location: Pleasant Hill, CA
Fri Jan 23, 2015 6:12 pm linkquote
If it was the stat, the temp gauge would have shown HOT. As the gauge is working, and showing normal temp, it's to be believed.
Fri Jan 23, 2015 6:26 pm

Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
 
Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
Fri Jan 23, 2015 6:26 pm linkquote
Im with you plus it did actually open at the specified 85c. under a more controlled test..

So the temp sensors..Any hint as to where they are located?
Sat Jan 24, 2015 7:00 am

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41403
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41403
Location: Pleasant Hill, CA
Sat Jan 24, 2015 7:00 am linkquote
All in the manuals - in this diagram, no.3, thermistor:



Wed Jan 28, 2015 10:47 am

Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
 
Addicted
GTS250
Joined: 03 Jun 2008
Posts: 610
Location: So. Cal.
Wed Jan 28, 2015 10:47 am linkquote
Update: After letting the scooter sit for the weekend I put the thermostat back in, topped of the coolant and pulled the positive battery cable for 20 minutes.

Fired it up and used on and off since Monday (~200 miles) with no further issue.

I will chock this up to my less than stellar wiring/electronics as I have had some pretty weird electrical issues over the years.
⬆️    About 8 years elapsed between posts    ⬇️
Sat Sep 10, 2022 7:04 am

Lurker
2010 Vespa 300 GTS
Joined: 31 Aug 2020
Posts: 4
Location: Kelseyville, California
 
Lurker
2010 Vespa 300 GTS
Joined: 31 Aug 2020
Posts: 4
Location: Kelseyville, California
Sat Sep 10, 2022 7:04 am linkquote
Posting for future reference in case someone has the same problem....if the thermistor gets moisture in the connection it can throw off the sensor and lead to inaccurate readings...as such it should be lpart of the trouble shooting for this problem...
  DoubleGood Vespa Design  

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