Toyota TERCEL 1985 Repair Manual page 117

EMISSION CONTROL SYSTEMS - Air Suction (AS) System EC-29
AIR SUCTION (AS) SYSTEM
(Canadá Wagón M/T & 3A Engine)
Air is drawn through the air filter and air suction valve into the exhaust manifold to bum the remaining HC and CO.
Pulsation in the
Fresh Air from Air Filter
AS Valve
Exhaust Manifold
Vacuum
OPEN
Drawn into the exhaust manifold
Pressure CLOSED Not drawn