Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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