Ambient temp PID discepancy

D153, D175, C125, C127, C185 and C187 forum

Ambient temp PID discepancy

Postby FoxSTI on Mon Nov 14, 2016 5:20 pm

Guys any idea why the returned value from the ambient temp sensor in my car is 20-30 degrees off from what an actual thermometers is measuring?

Settings below.
Thermo read 79F-82F
Car reports 105 F

Do you guys see anything wrong?

Image
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Re: Ambient temp PID discepancy

Postby the_bluester on Mon Nov 14, 2016 9:02 pm

Is this taken from a sensor which displays on the stock dash? If so what does your dash report?
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Re: Ambient temp PID discepancy

Postby FoxSTI on Tue Nov 15, 2016 2:46 pm

So the dash was reporting 80'
This PID apparently read the Oem sensor typically found on the front bumper of cars (typical ambient temperature sesnsor).

This morning oddly enough all 3 values matched. Maybe the car needed to be power cycled? I'll check again when I'm home in a few days. But it was weird. I had something similar happen with a PID reading for the MAF sensor. Wasn't scaling properly.
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