AE81 On Chassy Means It Have A series Motor Before.....!
Later Maybe Swapped With Diesel And The 4EFE.....!
Book Might Be Build NEW While Replacing Engine To 2C...
Match The VIN Plate And Chassy No.....If YES...Then Its A Confirm A Series Car.....2A 3A As Stock...!
about IACV So Its Connected TO ECU For Idling Purpose....I Nothing But A Dual Side Motor Controlled Gate For Perfect Idle And Handling RPM On Engine LOAD Like PS/ Headlights/AC Etc
I Seriously Doubt If IACV Is Not Connected How Come Other Sensors Are Wired....
You Should Retrieve Error Codes From ECU In Order To Know....And Get Wiring Inspected Once And For ALL