Nissan Repair: 2 code issues. 2003 Nissan pathfinder, chilton books, air control valve

Question
I did an engine swap about 4 months ago.  My 03 pathfinder now has an 04 pathfinder engine with about 45,000 miles on it.  After the engine swap I've been getting engine codes P0113, and P1490.  The scanner also prints out the same codes saying that they are "pending".  I'm very confused as I can't seem to find anyway to fix these codes.  They seem to be high circuit outputs and stuff like that.  A mechanic thought it was the idle air control valve. It is idleing poorly! I bought one for around $200.00 and according to my haynes and chilton books,  03 and later pathfinders do not have these.  please help.  thanks.

                                                          Jay

Answer
Hi Jay -

The 2003/2004 motors are not compatible in that way. The computer is looking for sensor inputs that are not there and causing driveability problems.
You probably need to replace the ECM as well. Is it still available from the other vehicle?

Hope this helps -
aloha
calvin