Vibe FWD L4-1.8L VIN 8 (2004)
Canister Purge Control Valve: Description and Operation
EVAP CANISTER PURGE VALVE
The EVAP canister purge valve controls the flow of fuel vapors from the EVAP system, to the intake manifold. The PCM will change the duty ratio
cycle of the purge valve, controlling the purge flow volume. Purge flow volume is determined by manifold pressure, and the purge valves duty ratio
cycle. Atmospheric pressure is allowed into the canister to ensure that purge flow is consistently maintained when ever purge vacuum is applied to the
canister. The purge valve will also be opened during some portions of the EVAP system testing, allowing engine vacuum to enter the EVAP system.
