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Rev MS3 Basic 99-00, GM IAT reading 70 Farenheit

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Old 07-20-2019, 07:23 PM
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Default Rev MS3 Basic 99-00, GM IAT reading 70 Farenheit
Stock BP4W, have a GM IAT, spliced in on the two factory wires as per instructions. Reading in TunerStudio is a steady 70 degrees Fahrenheit. I'm assuming this means the board is not getting a reading from the sensor?
Checked for continuity and getting about 1v across the pins on the car side, and getting about ~264kohm on the sensor side (sensor is good, sensor has power from car).
Any suggestions?
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Old 07-20-2019, 08:26 PM
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Update: If I unplug the sensor the reading it TunerStudio shoots up to 300f and then bounces off the top and slowly comes back down. Tried this with 2 different IAT sensors (both GM), same effect.
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Old 07-20-2019, 08:30 PM
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Did you calibrate the sensor in tunerstudio? I think 70 degrees is the default for either a not detected sensor or an uncalibrated one
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Old 07-20-2019, 08:32 PM
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Seems as if continuity of any kinda results in 70f reading in tunerstudio.
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Old 07-20-2019, 08:33 PM
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Yup Calibrate Thermistor Tables -> 3 point -> GM

Originally Posted by HowPrayGame
Did you calibrate the sensor in tunerstudio? I think 70 degrees is the default for either a not detected sensor or an uncalibrated one
Last edited by Justin Pezzack; 07-20-2019 at 08:34 PM. Reason: Quote
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Old 07-25-2019, 06:48 PM
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Uploaded a quick video illustrating the problem. @Reverant could this be a bias resistor issue? I am using the default GM IAT calibration in TS.
Last edited by Justin Pezzack; 07-25-2019 at 08:12 PM.
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