2005 Toyota Corolla Owners Manual - Page 299
2005 Toyota Corolla Manual
Page 299 highlights
'05 Corolla_U (L/O 0409) Leak detection pump This pump performs fuel evaporation leakage check. This check is done approximately five hours after the engine is turned off. So you may hear sound coming from underneath the trunk for several minutes. It does not indicate a malfunction. ix 2005 COROLLA from Sep. '04 Prod. (OM12891U)