The EVAP system (The evaporative emission control system) is the one that allows the vapors from the fuel tank to be purged and burned by the engine, so they are not expelled into the atmosphere as emissions that can damage the environment. This system consists of a pressure sensor, the FTP (Fuel Tank Pressure), this sensor checks the proper functioning of the EVAP system.
The Evaporation System (EVAP) periodically performs a pressure test, which checks that there are no leaks in the system. When the PCM (Powertrain Control Module) detects higher values than normal pressure, i.e. above 4.5 volts in the EVAP system, it activates through the FTP (Fuel Tank Pressure) sensor the DTC code P0453.