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Evaporative Emission System (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly. This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum.
The actual amount of purge flow is typically monitored by the EVAP pressure sensor, as well as a number of other sensors. If the actual amount of the purge flow is different from what is expected, the engine computer determines a fault and stores the code P0441 Evaporative Emission Control System Incorrect Purge Flow.irst, let's quickly review what the Evaporative control system is. The Evaporative control system (EVAP) prevents gasoline vapors from the fuel tank from escaping into the atmosphere. The Evaporative control system catches and stores gasoline vapors in a small box installed near the fuel tank called charcoal canister.