DTC P0452 Or DTC P0453: Description
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
The EVAP Control System Pressure Sensor (EVAP-CSPS) detects pressure in the purge line. The sensor output voltage to ECM increases as pressure increases. The EVAP-CSPS is not used for engine control. It is only used for on-board diagnosis.