Vacuum Sensor For Hydrocarbon Adsorber Catalyst System (Prius)
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
Vacuum sensor provides input signal to Engine Control Module (ECM). ECM uses input signal for controlling the Hydrocarbon Adsorber Catalyst (HCAC) system. For additional information on HCAC system, see HYDROCARBON ADSORBER CATALYST SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS. Vacuum sensor is located at passenger's side front corner of the engine. See Fig 1.