GM CTS sensors & MAT sensors

[Scot Sealander]

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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