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 P0441 or DTC P0446 is set if EVAP system leak is detected, or if malfunction in EVAP VSV, pressure switching valve VSV or vapor pressure sensor occurs. Possible causes are:

• Disconnected, damaged or blocked vacuum hose.
• Fuel tank cap incorrectly installed.
• Fuel tank cap cracked or damaged.
• Open or short in vapor pressure sensor circuit.
• Faulty vapor pressure sensor.
• Open or short in EVAP VSV circuit.
• Faulty EVAP VSV.
• Open or short in canister closed valve VSV circuit.
• Faulty canister closed valve VSV.
• Faulty VSV for vapor pressure sensor.
• Open or short in pressure switching valve VSV circuit.
• Faulty pressure switching valve VSV.
• Cracked or damaged fuel tank.
• Charcoal canister damaged.
• Fuel tank overfill check valve cracked or damaged.
• Faulty ECM.