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GM Coolant temp Sensor Recalibration
Posted: Mon Dec 05, 2011 6:33 pm
by yellowlt1ta
I have MSII v3.57 runing on TunerStudios. I recalibrate the coolant temp sensor and turn on the car and when its hot i recalibrate it again and it shows me a very diffent temp than it did before. Is there something wrong with the sensor or am i not recomended to recalibrate it when the car is hot?
Thanks, Dave
Re: GM Coolant temp Sensor Recalibration
Posted: Tue Dec 06, 2011 6:45 am
by Matt Cramer
What data did you use for the sensor?
Re: GM Coolant temp Sensor Recalibration
Posted: Wed Dec 07, 2011 9:42 am
by yellowlt1ta
Matt Cramer wrote:What data did you use for the sensor?
I used the pre set data from tunerstudios. I make sure it says coolant temp sensor then i set the presets on the one that says GM and i set it to fahrenheit.
Re: GM Coolant temp Sensor Recalibration
Posted: Mon Dec 12, 2011 5:24 am
by Matt Cramer
Test it with the sensor in a cup of boiling water and see if you get a correct reading.
Re: GM Coolant temp Sensor Recalibration
Posted: Mon Dec 12, 2011 2:57 pm
by yellowlt1ta
I will do so and get back to you with the results.
Re: GM Coolant temp Sensor Recalibration
Posted: Mon Jan 09, 2012 10:34 am
by Monzsta
GM uses a funky dual bias resistance strategy in the ECU on the coolant temp sensor. If you are piggybacking the stock ECU and vampiring the signal the odd shift in scale is what you will see.
You must either supply the megasquirt with it's own coolant temp sensor or cut loose the factory one from the stock ECU and give the stock ECU a resistor to play with to read normal temps.