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Old 05-17-2007, 09:44 PM   #1
RS2001
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Default P0483 Cooling Fan Rationality Check Malfunction

What the hell is this? I have a 2001 RS (as made obvious by my name) with 95000 miles on it and it just threw this code. My cooling fan seems to be working fine, so I can't really imagine what the problem is? As luck would have it, I need to get my car smogged too, so I need this fixed a.s.a.p. Is anyone familiar with this?

-Dan
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Old 05-17-2007, 10:40 PM   #2
nast
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Someone correct me if I'm wrong... but I think it is when the coolant fan circuit is on for a certain amount of time but the water temperature doesn't decrease a reasonable amount. Possibly because of insufficient coolant or coolant flow, busted radiator fan, poor air flow....

I may be thinking of a different code...

If you aren't having any overheating issues maybe the code is just a fluke occurrence. Check your coolant level and clear the code... maybe it won't come back.
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Old 05-17-2007, 11:11 PM   #3
Jon [in CT]
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I think this code is set when the Engine Coolant Temperature (ECT) sensor signal fails to rise above 15 mV (~1°F) after 2.5 minutes of operation.

You probably need a new ECT sensor.
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Old 05-22-2007, 03:23 PM   #4
RS2001
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I'll check the coolant level this afternoon.
New ECT sensor? Great, how much is the dealer gonna rape me for that?

-Dan
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Old 07-14-2007, 02:48 AM   #5
ejicon
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I'm pretty sure I'm going to need one myself:
http://www.auto-parts-wholesale.com/...EmbWRpZD0xMTMx

I just don't know where the hell this part is located.. Can anyone help?
-Ellz
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Old 09-10-2009, 06:25 PM   #6
sick1.8t
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i know this is an old thread but just for anyone else looking, the coolant sensor (ect) is on the coolant crosspipe under the intake manifold. have fun getting at it. its got a one wire connector i believe.

i've also read this could be because of a clogged or poor flowing radiator or a bad thermostat not allowing the coolant to move around and cool enough.
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Old 09-10-2009, 09:29 PM   #7
ejicon
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good to know
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