L-Series Wagon 4WD F4-1781cc 1.8L SOHC (Carb) (1987)
Canister Purge Control Valve: Description and Operation
Fig. 32 Charcoal canister
The purge check valve shuts off the purge line when the engine is not operating and when evaporative gas has bypassed the purge canister. It is
incorporated into the top of the canister. The purge check valve prevents evaporative gas from entering the intake manifold and accumulating there. This
prevents increased HC emission.