DTC Confirmation Test

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

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

Fuel filler cap open or leaking.
Incorrect fuel tank vacuum relief valve.
Incorrect fuel filler cap.
Foreign matter in fuel filler cap.
Leak in hose between intake manifold and EVAP Canister Purge Volume Control Valve (EVAP-CPVCV).
Foreign matter in EVAP Canister Vent Control Valve (EVAP-CVCV).
Leak in EVAP canister or fuel tank.
Leak or blockage in EVAP purge line.
Leak or blockage in hose to EVAP Control System Pressure Sensor (EVAP-CSPS).
Defective EVAP-CVCV or circuit.
Defective EVAP-CPVCV or circuit.
Defective EVAP-CSPS.
Defective Absolute Pressure (AP) sensor.
Defective fuel tank temperature sensor.
Leak between EVAP canister and EVAP-CVCV.

To set DTC, drive vehicle according to specified driving pattern to set System Readiness Test (SRT) codes. See SYSTEM READINESS TEST under SELF-DIAGNOSTIC SYSTEM. Stop vehicle and go to next step.
Using scan tool, check SRT status of EVAP system. If EVAP system SRT is complete, system is okay at this time. If EVAP system SRT is incomplete, turn ignition off, wait at least 10 seconds and go to next step.
NOTE: It is not necessary to allow engine to cool before driving vehicle.
Perform driving pattern again. Stop vehicle. Using scan tool, retrieve DTCs. If DTC P0440, DTC P0455, DTC P1440 or DTC P1447 is set, perform appropriate diagnostic procedure. If DTC P0440, DTC P0455, DTC P1440 or DTC P1447 is not set, go back to step 2.