Air Injection: Description and Operation

System Schematic:

Air Injection System Description
This system is designed to improve emissions performance by supplying fresh air from the air cleaner into the exhaust manifold through the air suction valve.

49ST And HI ALT System Operation:

California System Operation:

When the air suction solenoid valve is activated, manifold vacuum raises the diaphragm of the air suction valve and fresh air from the air cleaner is induced to the exhaust manifold through the reed valve of the air suction valve by the pulsation of the exhaust gas.