Charcoal Canister

On all models, check for clogged filter and/or stuck check valve by blowing low pressure compressed air into canister tank port. Check that air flows freely out of other canister ports.
On fuel injected models, blow air into canister purge port. Check that air does not flow out of any other port.
On carbureted models, blow air into the purge port. Check that air flows freely through other ports. On all models, replace canister if it does not operate as outlined.

Fig 1: Fuel Evaporation System (Tercel)