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 when malfunction exists with the canister closed valve VSV, EVAP VSV, pressure switching valve VSV or vapor pressure sensor. Canister closed valve VSV may also be referred to as CCV VSV. 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.
• Pressure switching valve VSV circuit is open or shorted.
• Defective pressure switching valve VSV.
• Canister closed valve VSV circuit is open or shorted.
• Defective canister closed valve VSV.
• 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.
• Defective overfill check valve.
• Defective ECM.