Circuit Description

Vapor pressure sensor and vapor pressure sensor 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 vapor pressure sensor malfunctions. Possible causes are:

• Damaged, disconnected or restricted vacuum hose(s) or tubes.
• Fuel tank cap is loose or improperly installed.
• Defective fuel tank cap.
• Damaged fuel tank.
• Defective charcoal canister.
• Vapor pressure sensor circuit is open or shorted.
• Defective vapor pressure sensor.
• Defective ECM.