[s-cars] Multifuntion sensor Q's.&In-Reply-To=

[Mike Claire]

Sorry for the hijack.  But which sensor controls the coolant temp gauge?  I
thought it was the MFTS, but now I'm not sure.  If it matters, mine's a '93.

If the coolant gauge reads zero, but the car is at operating temp, at which
sender do I check for voltage - the MFTS, or the G62 coolant temperature
sender?  Any details on which pin, and what I might expect for voltage would
be a great help.

My coolant temp gauge is intermittent and I figured it was probably a cold
solder joint in the cluster PC board, so I was willing to let it slide.  But
if it's a sensor, and if that means the ECU gets the same reading as the
gauge (zero) about 1/2 the time, it wouldn't be cool if the ECU is telling
the car to run extra rich during normal driving.

I do see a little soot on the back bumper (pearl) if I don't wash the car
for a couple weeks.  I figured that was just my Pastore 1+ chip (MTM) doing
its thing (rich mixture on boost).

The gauge is either awake, showing the right temp, or asleep, reading the
same as it would with the ignition off.  It goes back and forth, every 15
minutes or so.  My mileage is same as always - 20-22 mpg in a good mix of
highway/around town driving, making good use of the turbo.




Mike



On 3/25/07, Dave Forgie <forgied at ae.ca> wrote:
>
> Paul: Calvin's answer is spot on.  If you need more info, follow the
> link below to my UrS4/S6 FAQ page on AudiWorld.  The link leads to info
> about the MFTS and its role in the 3B and the AAN and the role of the
> G62 coolant temp sensor that is likely your problem:
>
> http://forums.audiworld.com/s4s6/msgs/150040.phtml
>
> The climate control codes (to compare the coolant temp from the MFTS to
> that from the G62) is Channel 51 at:
>
> http://www.12v.org/maintenance/index.php?section=tr&ss=hvac&ch=ccodes
>
> HTH
>
> Dave F.
>
>   the G62
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