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Outside Ambient Air Temperature; Ultra gauge question
Topic Started: May 4 2012, 07:05 PM (586 Views)
dayle1960
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Fastest Hampster EVER

Outside ambient air temperature......Now I'm just a plain old shade tree mechanic and am not a techno wizard like Woddie, mwebb, starscream, or Bad Bent, but I dreamed of staying in a Holiday Inn last night.

That being said, I wonder why in the world the builders of the ultragauge would have a parameter on their gauge that shows "outside ambient air temperature." There is no way that I have an exterior thermometer on my '96 metro. I doubt it came as an accessory. So my question is, "How in the world can the ultragauge know how hot or cold the outside temperature is around my metro?

Anybody wanna chime in on said conumdrum?
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mwebb
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FOG

it is a generic PID
Parameter ID
on the later version of Generic OBD2

the Geo Metro predates that version

so
you can use coolant temp and air temp together before you start the engine after the engine has been
sitting
cold
for some time

those values will both be ambient air temperature

coolant temp must be equal to air temp as in
MUST
otherwise at least 1 of the temp sensors is out of range (broken) which may be a circuit problem or sensor problem
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