What was found
PHX - ABORTED TAKEOFF - FLT 231 -C- ON TAKEOFF ROLL AT 90 KTS FLIGHT CREW OBSERVED ECAM MESSAGE ALT LAW AND NO AIRSPEED INDICATION ON PFD NR 2 AND THE TAKEOFF WAS REJECTED. MAINTENANCE TROUBLESHOT AND REPLACED THE NR 2 ADIRU. AFTER ALIGNING THE ADIRU BITE CHECKS WERE GOOD. MAINTENANCE ALSO RAN THE NR 2 PITOT SYSTEM TO 150 KTS WITH TEST SET AND NR 2 AIRSPEED INDICATIONS WERE NORMAL. AIRCRAFT WAS RETURNED TO SERVICE. TEAR-DOWN REPORT INDICATES A THERMAL CALIBRATION PERFORMED AND TESTED. NO OTHER DEFECTS NOTED ON THIS UNIT.