MAT Temp Way off!! WTF!?

[92GNZ28]

scanning my car with WinALDL showing that when engine warmed up, my MAT temp is almost 250 F!!! With a thermometer stuck in the hole that the MAT goes it's only getting up to like 110-120. Replaced sensor twice, still no change. Can put the sensor in cold watewr and only goes down to 100F. WTF!?!?

 

[THE CROW]

Check Voltage

Check voltage at the connector (tan wire). You should have about 2.45 KOEO and about 2.1 KOER. Also check the black, ground wire.

 

[92GNZ28]

I have 5 volts at the tan wire KOEO with connector unplugged. I have 1.8volts on the tan wire while back-probed w/ KOEO. Back-probed black wire with KOEO and ground is good.

 

[jshilli1]

I think MAT on WinAldl does not represent the ATS. I believe MAT is a calculated value from the ATS (table lookup?). Does anyone here know the formula / table lookup or is it chip - specific?

My ATS reading on ScanMaster runs between 32F and 150F.

With WinALDL, my MAT was 172 today when I shut my car off- ATS on ScanMaster was showing 99 deg F.

 

[jshilli1]

It looks like subtracting 73 gets the approximate ATS- the temperature in my garage was about 55 this morning... I have a FMIC and the air filter is down between the air dams so pretty cool ATS / MAT.