Nissan 14950-CD00A Emission Canister Assembly

The Evaporative Emissions Control (EVAP) system uses its components to prevent vapor release while sending fuel tank vapors through a routing system to the EVAP canister where storage occurs until the engine consumes them. The EVAP canister exists in the right rear corner of the vehicle and it has activated charcoal which should need no maintenance. Throughout the EVAP control system the pressure sensor detects evaporative gas pressure after which it sends signals to the Powertrain Control Module (PCM). This module operates the canister purge solenoid which ventilates fuel vapors into the intake manifold system. When the PCM energizes the canister vent control valve it becomes closed because this control valve maintains a normally open state for diagnostic procedures. A malfunction in the EVAP system usually causes a strong fuel smell that can originate from defects in the fuel cap and the EVAP hoses and the canister itself. The replacement process of EVAP parts including purge solenoid, assembly and valve and pressure sensor follows a method of disconnecting wiring harnesses and hoses before securing bolts and applying O-rings to new components during installation.