Evaporative System Monitoring

Evaporative Emission Control Monitoring System consists of fuel vapor generation, evacuation, and leakage check step. The OBD-II system checks vapor generation by monitoring fuel pressure in small amounts and then it evacuates the evaporative system by means of PCSV actuation in order to maintain a certain vacuum level. The final step is to check if there is any leakage in the system by checking for a vacuum loss.