correct idle behavior?
 

hello,
on all my previous cars when i start the car when cold the idle goes up to like 1500 and gradually drops as the car gets warm. currently when i start the car it just goes to normal idle speed (like 800 rpm) and stays there even if it's freezing cold. a side note, i just replaced the ECU temperature sensor. i found in a search of the forum about an AACV, does it sounds like this is my problem? what is the correct idle behavior for the SVX?

thanks.