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P0112 Intake Air Temperature Circuit Low Input 850 1997

posted by  vesparally on  Sun Jun 14 22:30 CST 2020
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last visit: Tue Oct 21 18:11 CST 2014
[RELATED]

'97 850 GLT 200K +

So the p0112 code tells me to check the ambient temp sensor.
My OBD2 reader registered -40F on a 75F day.
Might explain the rough idle after start-up & poor gas mileage.

Is there a way to bench test the air sensor like I do with a liquid sensor such as measuring resistance vs air temp ??

Thanks
Peter








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P0112 Intake Air Temperature Circuit Low Input 850 1997

posted by  KlausC on  Mon Jun 15 10:52 CST 2020
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last visit: Fri Oct 24 10:15 CST 2014
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The higher the resistance, the lower the temperature. Before replacing, clean both sides of the plug, clear the code and see if it comes back again.
--
Keeping it running is better than buying new








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P0112 Intake Air Temperature Circuit Low Input 850 1997

posted by  vesparally on  Wed Jun 17 12:52 CST 2020
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last visit: Tue Oct 21 18:11 CST 2014
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Welp, the one AAT sensor I found was on the drivers side and is apparently only for the instrument cluster temp read-out, when its disconnected the gauge says "lo" and the OBD reader stills says "-41 F".

Wiring diagram mentions 2 sensors, any idea where the other one might be located.

Thanks
Peter








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P0112 Intake Air Temperature Circuit Low Input 850 1997

posted by  KlausC on  Wed Jun 17 13:12 CST 2020
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last visit: Fri Oct 24 10:15 CST 2014
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My 1998 had 2 sensors behind either side of the front bumper. The 1997 had them both together. Look down this thread, there is a picture of the 1997:

https://www.matthewsvolvosite.com/forums/viewtopic.php?t=78051

--
Keeping it running is better than buying new








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P0112 Intake Air Temperature Circuit Low Input 850 1997

posted by  vesparally on  Mon Jun 15 11:28 CST 2020
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last visit: Tue Oct 21 18:11 CST 2014
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Thanks, will check & clean connectors.
Just wondering what the baseline resistance is so I can tell if the sensor is in the ballpark or not.








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P0112 Intake Air Temperature Circuit Low Input 850 1997

posted by  KlausC on  Mon Jun 15 12:40 CST 2020
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

0F is usually around 2500 or so. Above 80 should be close to 300 ohms.
--
Keeping it running is better than buying new







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