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 an excessively low voltage is sent to ECM from EVAP-CSPS. Possible causes are:

EVAP-CSPS circuit open or shorted.
EVAP-CSPS hose clogged, kinked, leaking, disconnected or improperly connected.
Defective EVAP-CSPS.
Defective EVAP Canister Vent Control Valve (EVAP-CVCV).
Defective EVAP Canister Purge Volume Control Solenoid Valve (EVAP-CPVCSV).
Defective EVAP canister.
Defective hose between EVAP-CVCV and water separator.

NOTE: Before proceeding, ensure ambient temperature is more than 41°F (5°C).