Strange IAT problem
I'm seeing a strange issue with my IAT reported in MT. It used to be almost perfectly in sync with the CLT when I turned the car on and now it says it's like 50 degrees warmer than it should be. How can I tell if the sensor is broken? Can I ohm it out? Is there a chart somewhere of the resistance at given temperatures? It's the standard GM open element sensor.
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Go to google and type GM AIT sensor and do an image search. It's out there. Yes, you can ohm test it. If you're MS1, I bet this is a easy-therm problem. But I have 0 experience with MS1.
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I'd be very surprised if it was software. I've had it running fine for awhile and have not changed the firmware image at all. I was looking at my longs and one day it just stopped reading properly. I will see if I can find the chart.
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I wondering when you put the values in easytherm, you didn't just make a 3 row ohm chart ;)
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Yeah, but those values are through the whole system including the bias resistor and whatever else is in the circuit. I need the datasheet values so I can unplug the sensor and ohm it out to rule out/confirm the sensor is bad. If it's good, then that means either something went on the board or somehow data got overwritten in the firmware where it wasn't supposed to.
I think I found it: http://www.autozone.com/images/cds/j...3d800f03dd.jpg Guess Autozone is good for something at least. |
You know. I've been noticing the same problem recently. Sometimes, not always, the IAT will be exactly 10 degrees higher than the CLT after the car has been sitting all night.
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Originally Posted by johndoe
(Post 335689)
You know. I've been noticing the same problem recently. Sometimes, not always, the IAT will be exactly 10 degrees higher than the CLT after the car has been sitting all night.
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These are the before and after...
Before: http://img253.imageshack.us/img253/4...lem2kr6.th.jpg After: http://img510.imageshack.us/img510/7...blemwl6.th.jpg |
Originally Posted by johndoe
(Post 335689)
You know. I've been noticing the same problem recently. Sometimes, not always, the IAT will be exactly 10 degrees higher than the CLT after the car has been sitting all night.
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