[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: GM CTS sensors & MAT sensors




Like I said, I've actually done some testing and the resistances are the
same.
THE DIFFERENCE is in the response times.
That is of course, ignoring mountings, and wheather the sesning element is
open or not
Bruce



> > I copied these tables because they actually showed slightly different
> > values.  In almost all cases that I can remember, the charts for CTS
> > and IAC have been identical.
> This is quite interesting. After Bruce pointed out there was an IAT
> table at:
>   http://syty.org/d&e-code23.html from  http://syty.org/diagnostics.html
> I realised my JE Camira factory service manual had the same information,
> so I looked, and there's the exact same table for IAT and a quite similar
> one for CTS,
> However, on the CTS diagnostic page there's a warning ...
> !       NOTE: This resistance value table
> !                 IS NOT THE SAME
> !              AS FOR THE MAT SENSOR.
> !       They have different resistance-to-temperature values.
> And similarly there's a warning on the MAT sensor diag page too!
> So, I can only think that GM wants to create the illusion that IAT and CTS
> sensors are different so that people don't try and interchange them.
Perhaps
> because they have quite different thermal properties, (but almost
identical
> temperature properties). This also gets back to the discussion about
> placement of the IAT and how quickly it really responds to ambient
conditions.
> Perhaps the smaller thermal lag of the CTS is the major difference between
the
> two sensor types?
> regards, Peter.

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org