The Evaporative Emissions Control System (EVAP) is used to allow vapors coming from the fuel tank to be purged and subsequently burned in the engine. This method does not release harmful emissions into the atmosphere.
The EVAP system includes the pressure sensor (FTP), which verifies the correct performance of the system through periodic pressure tests to check for leaks.
If the PCM (Powertrain Control Module) determines that the EVAP system pressure sensor signal is intermittent, the fault code P0454 OBDII will be set.