Air Injection Valve (AIV) Control

The air injection system is designed to send secondary air to exhaust manifold to reduce exhaust emissions (HC and CO). The system consists of an air injection valve, AIV control valve and AIV solenoid valve. The air injection valve is designed for one-way use and consists of a one-way reed valve.

When the ECU senses a vacuum signal created by excessive exhaust pressure pulsations from the exhaust manifold, it sends a signal to the AIV solenoid valve to activate the AIV control valve. The control valve opens up and allows air to enter the exhaust system upstream of the 3-way catalytic converter. This system also operates during deceleration for the purpose of blowing water off around the air injection valve.