Evaporative Emission Control System (EVAP) Deactivation

The Evaporative Emission Control System, or EVAP, was designed to prevent gasoline vapors from escaping into the atmosphere from a vehicle's fuel system. When the vehicle is stationary, the fuel vapors are collected in a container specifically designed for this purpose. After the engine starts up, a signal from the Engine Control Unit (ECU) directs the gasoline vapors from the serving container to the engine cylinder for the combustion process through a special purge valve. The most common problem associated with the EVAP canister is a faulty purge control, which can cause serious problems and trigger the check engine light. As a result, sometimes the situation requires us to disable the EVAP in the engine control unit to determine the exact cause of the vehicle malfunction and eliminate other potential options.