Secondary Air Injection System

Auto Systems and Repair

The secondary air injection system pumps fresh air into the exhaust system to help reduce exhaust emissions. 

Depending on the model, the air can be injected at one or more locations. Early systems used a belt-driven pump with air being directed by vacuum-operated switching valves. Newer vehicles use an electric pump and if needed, computer-controlled switching valves.


Key Component - Power Train Control Module

The power train or engine control module is a powerful computer that manages the engine’s ignition, fuel injection, and emission systems. In some vehicles, it may also control the operation of the automatic transmission and the anti-lock brake system. More >>


Additional Key Parts

Air pump, Air injection check valve


 

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