Fan runs too fast after SMC update

About a week ago I updated the SMC of my Macbook 7.1 (mid 2010).
I even leaved it sometime (days or weeks) on the list of software updates without installing, as it said I should not touch until it was done and it was to fix some compatibility with hardware that I don't have. So I did it at a time I would not do anything.
Since then, the fan began to work at full speed almost permanently, sometimes it slows down to normal operation (really normal, increase rotation when the device heats up, slow down to 2k rpm when it is cold).
I have formated the HD twice, because I tought that had done something wrong, but the problem persisted, so I used the hardware diagnostics and found two error numbers, one for the fast run:
4SNS/1/40000001:TN1D - - 110.00
And another for the extensive test:
4SNS/1/40000001:TN1D - - 1.000
I searched these numbers but the results are not good nor precise, peaple said it's related to thermal detector or the logic board permanently damaged.
My current SMC version (after the update) is 1.60f6
I don't know the old version of SMC.
I installed iStat PRO widget, from where I can see that all thermometers are operating normally (these must be the source of the control of the fan) and the fan running at 6,200 rpm.
I even tried to install Fan Control system pref component, but it can only increase the commanded speed of the fan at any time, never decrease.
I also tried to reset SMC as said in http://support.apple.com/kb/HT3964 , sugested in https://discussions.apple.com/thread/1306035
Is there a way to roll back to the old SMC version?
Or to install some program to overwrite the wrong control?
Thank you.

you need to bring it to an Apple store or AASP to have it properly diagnosed. Only Apple certified technicians have access to what those diagnostic codes mean.

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Your post confirms what I suspect is true about C2D temps compared to CD temps, which is that the C2D is fundamentally no cooler (possibly hotter) than the CD, but Apple have doubled the fan speed in the C2D to make the C2D run cooler.
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