Air Injection Control Valve: Description and Operation

DESCRIPTION
The combination valve consists of two valves. The uppermost valve, a spring-loaded diaphragm, is opened by being drawn upward as a result of the throttle body induced vacuum, regulated by the air pump solenoid. The lowermost valve, a reed valve, is opened by deflection as a result of the air pressure from the air pump. The reed valve helps to prevent exhaust gases from circulating back toward the pump. Air from the pump flows through the diaphragm and through the reed valve, to the exhaust manifold.