What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO DFW DUE A FUEL AUTO TRANSFER FAULT ECAM ALERTED THE FLIGHT CREW OF A FUEL INDICATION ERROR. LEFT SIDE INDICATION WAS READING APPROXIMATLEY. 4000 LBS LESS THAN THE RIGHT-SIDE DURING CRUISE PHASE. FUEL QUANTITY INDICATIONS RETURNED TO NORMAL LATER IN THE FLIGHT. AT WORSE POINT LEFT SIDE 1560/8500 RIGHT SIDE INDICATION 12500/1560. THE AIRCRAFT LANDED SAFELY AT DFW AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE ACCOMPLISHED FUEL QUANTITY BITE CHECKED ON BOTH CHANNELS PER AMM 28-42-00 WITH NO FAULT NOTED. ALSO PERFORMED INTERCELL FUEL TRANSFERS BETWEEN OUTER TO INNER TANKS WITH NO FAULT NOTED PER AMM 28-15-00.