98 EVAP Canister Purge Valve - Shirt To B+/Short To Ground: Function

The fuel vapors from the fuel tank must not escape into the open air. For this reason, the ventilation line of the fuel tank is routed to an evaporative emission filter (or EVAP canister) that retains the fuel vapors. When driving, air is drawn in through the EVAP canister and picks up the accumulated fuel vapors and feeds them to the combustion process.

The EVAP canister purge valve is installed in the line between the EVAP canister and the intake system. The direction of flow through the valve is indicated by an arrow on the plastic housing. The output stage that controls the EVAP canister purge valve is monitored.