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Re: GM CTS sensors & MAT sensors
Peter Gargano wrote:
> 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.
That is possible. I have tried several times to interchange them,
and they report the same temp. The 747 uses a 1k pullup on the CTS,
just like most all GM IAT sensors. The transfer function (volts to
temp)
looks the same as IAT.
Scot Sealander
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