Canister Purge Solenoid: Description and Operation

WITH UPGRADED EMISSIONS

The EVAP SP valve is used to control purge. The ECM opens and closes the EVAP SP valve to control vapor flow.

The ECM operates a normally closed EVAP SP valve which controls the vacuum to purge the canister. Under cold engine or idle conditions, the EVAP SP valve is not energized by the ECM, which blocks vacuum to the canister.