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 if there is a malfunction in EVAP VSV, canister closed valve VSV or in vapor pressure sensor. Possible causes are:

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