Circuit Description

Vapor pressure sensor, canister closed valve Vacuum Switching Valve (VSV) and pressure switching valve Vacuum Switching Valve (VSV) are used to detect abnormalities in the EVAP system. DTC is set if a leak is detected in EVAP system or vapor pressure sensor malfunctions. Canister closed valve VSV may also be referred to as CCV VSV. Possible causes are:

• Damaged, disconnected or restricted vacuum hose(s) or tubes.
• Fuel tank cap is loose or improperly installed.
• Defective fuel tank cap.
• Damaged fuel inlet pipe or fuel tank.
• Defective charcoal canister.
• Vapor pressure sensor circuit is open or shorted.
• Defective vapor pressure sensor.
• Defective overfill check valve on fuel tank.
• Defective ECM.