What was found
ENG 1 OIL LO PR ECAM WARNING IMMEDIATELY AFTER LIFT OFF. DETERMINED IT WAS AN ERRONEOUS MESSAGE BASED ON ECAM AND ANALOGUE OIL PRESSURE GAUGES. DIVERT TO CAE WITH BOTH ENGINES OPERATING NORMALLY. OPS CHECKED LOW OIL PRESSURE SWITCH REF AMM 71-00-00, REPLACED RELAY 19ES REF AIRBUS ESPM 20-46-50-1. OPERATED ENGINE AT TAKEOFF POWER, NO LOW OIL PRESSURE LIGHT, PRESSURE FLUCTUATIONS OR ECAM MESSAGES OCCURED. ACFT OK THIS SYSTEM, DIVERSION