Auto Systems and Repair: Secondary Air Injection System

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