[V6-12v] Temp. gage reading low, trouble code 2312

[Clive Young]

Scott

Sounds bang on . we were theorising about wether the computer wants to see
the car warm up. yep ... ! and you have the proof ... I guess those AUDI
engineers aren't so bad after all ..

too bad too.. I just threw out my t-stat that I changed when I did my pump
...



Clive
----- Original Message ----- 
From: "Scott Thompson" <n3xgc at yahoo.com>
To: "Clive Young" <cyoung1661 at rogers.com>
Cc: "Tom Christiansen" <tomchr at ee.washington.edu>
Sent: Wednesday, January 14, 2004 8:46 PM
Subject: Re: [V6-12v] Temp. gage reading low, trouble code 2312


> FYI,
>
> Both situations where I saw this it did throw the code.  Also, after
> resetting the code with VAG-COM, you could clock 18 minutes and watch the
> check engine light come on, as Tom describes.  Also, the engine temp
> description was very similar.  Just my experience... YMMV.
>
> -Scott
>
>
> ----- Original Message ----- 
> From: "Clive Young" <cyoung1661 at rogers.com>
> To: "Scott Thompson" <n3xgc at yahoo.com>
> Cc: "Tom Christiansen" <tomchr at ee.washington.edu>
> Sent: Wednesday, January 14, 2004 4:03 PM
> Subject: Re: [V6-12v] Temp. gage reading low, trouble code 2312
>
>
> > Scott
> >
> > In your situation was there a trouble code set ? After reading Tom's
email
> > my initial reaction was the same as yours but now after reading more
info
> I
> > am not 100% certain. It is still the most likely but none of the info
for
> > this code indicates an actaul problem with the cooling system. It is
> almost
> > like the sensor is failing a basline test somewhere. If you DID get the
> code
> > , fair enough, but if you didn't , more thought may be required before
> > wrestling with that tstat housing under the timing belt
> >
> > Clive
> >
> > ----- Original Message ----- 
> > From: "Scott Thompson" <n3xgc at yahoo.com>
> > To: "Tom Christiansen" <tomchr at ee.washington.edu>; "V6-12v List"
> > <v6-12v at audifans.com>
> > Sent: Wednesday, January 14, 2004 3:34 PM
> > Subject: Re: [V6-12v] Temp. gage reading low, trouble code 2312
> >
> >
> > > Tom,
> > >
> > > I'd say it's very likely that it's the thermostat. This exact
situation
> > > happened on both my wifes and my Dad's 96 A4s.
> > > The thermostat is not easy to get to.  You need to remove or at the
> least
> > > wrestle with the timing belt (check the archive over the last month,
> there
> > > were some posts on this).  I was able to buy a thermostat from a local
> > parts
> > > store, but once finding that I needed to fiddle with the timing belt,
I
> > just
> > > had the TB and waterpump done too (It was due in 8k miles anyway), and
> > > returned the thermostat.
> > >
> > > -Scott
> > >
> > >
> > >
> > > ----- Original Message ----- 
> > > From: "Tom Christiansen" <tomchr at ee.washington.edu>
> > > To: "V6-12v List" <v6-12v at audifans.com>
> > > Sent: Wednesday, January 14, 2004 3:20 PM
> > > Subject: [V6-12v] Temp. gage reading low, trouble code 2312
> > >
> > >
> > > > Folks,
> > > >
> > > > The temp gage in my 1994 90S reads very low. On short drives (<15
min)
> > > > in the current 45-50 degree (F) weather the needle on the gage
barely
> > > > makes it up to the minimum mark. Even after riding in stop-and-go
> > > > traffic for maybe 10-15 minutes followed by a short ride on the
> freeway
> > > > it usually doesn't make it higher than slightly below the second fat
> > > > mark at about 11 o'clock on the gage. On longer drives (one hour or
> so)
> > > > on the freeway the gage typically sits around or slightly above the
> > > > second small dot from the bottom. I have also been getting the 2312
> > > > trouble code indicating trouble with the Engine Coolant Temperature
> > > > sensor G62. I'm not 100% certain of the code number, but I am 110%
> sure
> > > > it was the ECT error code. The heat comes on before the needle
reaches
> > > > the lower dot below the minimum mark on the gage.
> > > >
> > > > I changed the ECT sensor. The sensor which was in the car (suspected
> > > > faulty) had an amber or brownish-orange 2-pin connector. The
> replacement
> > > > had a white connector. Don't know if there is a difference between
the
> > > > two. I've thrown the old ECT away... While changing the thing, I
> cleaned
> > > > the connector.
> > > >
> > > > I have paged through Bentley for procedures on how to test the ECT
> > > > sensor and the gage. I remember testing the new ECT sensor before I
> > > > installed it and it performed roughly like it should (the manual
> > > > mentions approximate values of resistance vs temperature, but I
didn't
> > > > have a thermometer available to verify the ambient temp. I just
> > > > guessed...).
> > > >
> > > > For testing the gage, Bentley recommends messing around with ECT
> thermal
> > > > switch F76, which should be a 4-pin device located in the coolant
line
> > > > behind the passenger's side cylinder head. I remember looking for
this
> > > > without finding it at different time. Is Bentley on crack (wouldn't
be
> > > > the first time!!) or have I just not looked hard enough? The only
> other
> > > > coolant temp. device I recall seeing is the huge thing in the bottom
> of
> > > > the radiator controlling the fan.
> > > >
> > > > Any suggestions on how to drive this gremlin away? Is this an
obvious
> > > > case of stuck open thermostat? Or is it more likely to be an
> electrical
> > > > issue?
> > > >
> > > > If it turns out to be a thermostat issue, I suppose I'll need a new
> > > > thermostat and an o-ring (+ coolant). Are these dealer-only items or
> > > > should I shop around a bit? Any advantage/disadvantage of a non-OEM
> > > > thermostat?
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > Tom
> > > >
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