Toyota 2004 HIGHLANDER User Manual page 413

'04 HIGHLANDER_U (L/O 0308)
Leak detection pump
(2AZ- FE engine)
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 under-
neath the luggage compartment for several minutes. It
does not indicate a malfunction.
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2004 HIGHLANDER from Aug. '03 Prod. (OM48478U)