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Possible Causes

Malfunction is detected when EVAP control system has a very large leak, or EVAP control system does not operate properly. Possible causes are:

Incorrect fuel tank vacuum relief valve.
Incorrect fuel filler cap.
Fuel filler cap remains open or fails to close.
Foreign matter caught in fuel filler cap.
Leak in line between intake manifold and EVAP-CPVCSV.
Foreign matter caught in EVAP Canister Vent Control Valve (EVAP-CVCV).
EVAP canister or fuel tank leaks.
Leak or blockage in EVAP purge line.
Blockage in EVAP Control System Pressure Sensor (EVAP-CSPS) hose.
Defective EVAP-CVCV or circuit.
Defective EVAP-CPVCSV or circuit.
Defective Fuel Tank Temperature (FTT) sensor.
EVAP-CVCV "O" ring missing or damaged.
Defective EVAP-CSPS.
Defective refueling control valve.
Leak in On-Board Refueling Vapor Recovery (ORVR) system.