Possible Causes

WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.

Malfunction is detected when EVAP-CVCV remains closed under certain driving conditions. Possible causes are:

Defective EVAP-CVCV.
Faulty EVAP Control System Pressure Sensor (EVAP-CSPS) or circuit.
Blockage in hose to EVAP-CVCV.
Defective water separator.
EVAP canister saturated with water.