Vapor Pressure Sensor (RX300)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) monitors fuel tank pressure to determine if a leak or an abnormality exists in EVAP system. Vapor pressure sensor is located on top of fuel tank. A vapor pressure sensor Vacuum Switching Valve (VSV) is located in vapor line at EVAP canister. ECM will operate VSV, allowing vapor pressure sensor to monitor fuel tank pressure and EVAP system. EVAP delivers an input signal to ECM to indicate fuel tank pressure.