WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DTC P0442: EVAP System - Small Leak Detected (Steps 1-4)
Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0442: EVAP System - Small Leak Detected (Steps 5-7)