PIC time could legally be logged while on IOE whenever you are manipulating the controls and that would be legal. As far as logging time as "PIC" for command of the aircraft you are not in command of the aircraft as long as there is a check airman in the right seat. Also, even if it were legal to start logging PIC from the start of IOE, most airlines would want to see logged PIC time only when you were PIC and not under any sort of check airman supervision. Hope that helps.