Circuit Description

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

• Damaged, disconnected or blocked vacuum hose(s).
• Fuel tank cap is installed incorrectly.
• Defective fuel tank cap.
• Damaged fuel tank.
• Defective charcoal canister.
• Vapor pressure sensor circuit is open or shorted.
• Defective vapor pressure sensor.
• Defective fuel tank overfill valve.
• Defective ECM.