Vapor Pressure Sensor (Prius)
Vapor pressure sensor, purge flow switching valve Vacuum Switching Valve (VSV) and canister closed valve Vacuum Switching Valve (VSV) are used to determine if a leak or an abnormality exists in the EVAP system. See Fig 1. EVAP system may also be referred to as fuel evaporative system. Engine Control Module (ECM) determines if a leak or an abnormality exists in EVAP system by using input signal from vapor pressure sensor. If a leak or abnormality exists, a Diagnostic Trouble Code (DTC) will be stored in the ECM. Vapor pressure sensor may also be referred to as EVAP vapor pressure sensor. Canister closed valve VSV may also be referred to as EVAP Canister Closed Valve Vacuum Switching Valve (EVAP-CCVVSV) or Canister Closed Valve Vacuum Switching Valve (CCV VSV). Purge flow switching valve VSV may also be referred to as EVAP Purge Flow Switching Valve Vacuum Switching Valve (EVAP-PFSVVSV). EVAP canister may also be referred to as charcoal canister.