to quote the SRD:
"To create an intelligent item the, creator’s caster level must be at least 15th. Time and creation cost are based on the normal item creation rules, with the market price values on Table: Item Intelligence, Wisdom, Charisma, and Capabilities treated as additions to both time, gold piece cost, and XP cost. Determine the item’s Intelligence, Wisdom, and Charisma randomly. The item’s alignment is the same as its creator’s. Determine other features randomly, following the guidelines in the relevant sections of this chapter."
so i don't think you roll for it...