definitely check it 1st thing before you start it up. Otherwise other factors are probably raising iat.

 

That read 80*. Def not right its 37-40* here in nny

 

Can you measure voltage on your IAT pin? IAT scaling is lookup table for voltage and it returns temperature in celcius degrees. Lets see what yours return.

 

As in multi meter correct ? Could I poke the wires right at the sensor ?

 

Will do that later today

 

2.31 vdc with the car off.(ignition on)

45*f

 

I have test bench IX ecu and also GM IAT sensor. I tested this with rom I sent you and for me it works, I get 20 C degrees from GM sensor (MUT 11) at room temperature 21.5C (room temp measured with Fluke + thermocouple sensor). I measured voltage too and it was 2.65V which matches exactly iat scaling table as expected. I was using normal maf air temp pin as sensor input as probably you too as you have harness for that. In your case at 45F=7C voltage we expect should be around 3.2V. So I have no idea what going on as scaling itself should work right, we have used this in couple of sd cars and it is exactly the same as in prepatched sd2.0 roms.

 

where are you measuring 211? Could it be a bad wire/ground?

Though, Im guessing that it would measure low, instead of high, if it was a bad connection somewhere.

Just throwing this out there....Dont know what your situation is as far as needing to get the car running (or whether its running as is, or whether you also still have the maf installed). But if you needed to, you could just use the fuel temp sensor temporarily. Alot of ppl use it instead of using a real IAT.

 

Measured at the sensor

 

Wonder if I have a bad sensor..

 

How to change scaling from celsius > *f in the Rom ?

 

This is what I'm using:

<scaling name="TempScale" units="Celsius" toexpr="x" frexpr="x" format="%.0f" min="-40" max="140" inc="1" storagetype="int8" endian="big"/>
<scaling name="TempScale_F" units="Fahrenheit" toexpr="(9/5)*x+32" frexpr="(5/9)*(x-32)" format="%.0f" min="-30" max="900" inc="1" storagetype="int8" endian="big"/>
<scaling name="Volts16" units="Volts" toexpr="x*5/255" frexpr="x*255/5" format="%.2f" min="0" max="5" inc="0.05" storagetype="uint16" endian="big"/>

Then just decide which scaling to use in table (change TempScale to match your unit):

<table name="SD MAT Scaling for IAT Scaling Table" category="Speed Density Programming" address="b070" type="2D" level="1" scaling="TempScale">
<table name="MAT Sensor ADC volts" address="b106" type="Y Axis" elements="139" scaling="Volts16"/>
</table>

 

I Ordred a new sensor .. from NAPA .. since the values never changed much I'm going to try that

 

New sensor fixed problem!!!!!

 

Which scaling do you use now?