Circuit Description

Vapor pressure sensor and canister closed valve Vacuum Switching Valve (VSV) are used to detect abnormalities in the EVAP system. DTC is set if EVAP system leak is detected or vapor pressure sensor malfunctions. 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.