Air Injection Control Valve: Description and Operation

Injects air into the exhaust port and/or catalytic converter to heat the catalyst and oxygen sensor quickly during engine warm-up and reduce hydrocarbon (HC) and carbon monoxide (CO) exhaust emissions during normal engine operation.
- When the ECM energizes the air control valve, air is allowed to flow to the air switching valve where it is directed air to the exhaust port.
- During warm engine operation--closed loop--the ECM deenergizes the air control valve causing the air switching valve to direct air to the catalytic converter.
- If the air control valve detects a rapid increase in manifold vacuum--a deceleration condition--or the ECM detects a failure in the system--air is diverted to the air cleaner or dumped to the atmosphere.