Air Injection System: Description
Air injection is used on these models to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions. Fresh air is injected at the exhaust ports, allowing the gases to continue burning as they exit through the exhaust system. An air pump provides fresh air under pressure to be injected in the exhaust ports. A control system determines when the air should be injected.
The control system varies with each model. Major components include air switching valve (ASV), check valve, vacuum transmitting valve (VTV), bi-metal vacuum switching valve (BVSV), vacuum switching valve (VSV) and a catalytic converter temperature sensor.