Air Induction Valve Control System (AIV)

1986-88 300ZX, 1987-88 Pulsar & Sentra w/E16i Engine & Maxima

This system is designed to send secondary air to the exhaust manifold, using a vacuum caused by exhaust pulsation in the exhaust manifold.
Exhaust pressure in the manifold usually pulsates in response to opening and closing of the exhaust valve and it decreases below atmospheric pressure periodically. If a secondary air intake pipe is opened to atmosphere under vacuum conditions, secondary air can be drawn into exhaust manifold in proportion to vacuum.
The air induction valve is controlled by the ECCS/ECU corresponding to engine temperature. When engine is cold, the air induction valve control system operates to activate the 3-way catalytic converter quickly. This system also operates during deceleration to blow off water around the air induction valve.