Almera n16 1.5 high idle

Hi i've got a 1.5 2005 n16 almera which is idling between 1100-1400 rpm. I recently had a problem with lack of power which turned out to be a blocked cat. While figuring out the lack of power I had the throttle body off the car its a fly by wire type and now the car is idling high. I removed it again and gave it a good clean but it still idles high and fuel consumption is poor. I've read a post on the internet about the throttle postion sensors having to relearn by a series of ignition on and of procedures but it was for a 1.8 tino and also the same procedure for a 2.5 altima (usa). I have tried the procedure but it dosent work does anyone know if there is a different procedure if any for the 1.5?

Thanks for that, i tried disconnecting the battery to reset the ecu and the next morning everything was fine, idle back to normal, hopefully it stays that way. I havent done many miles yet so i will see if the fuel economy gets better i expect it will