Secondary Air Injection Check Valves

A remotely mounted bleed-off valve releases vacuum in the AIR system. The valve is similar in construction and operation to the evaporative purge control solenoid. As the mass flow of the exhaust gases pass the injection piping, a venturi vacuum effect occurs. The vacuum is strong enough to hold the internal shut-off valve closed when the Powertrain Control Module (PCM) commands the secondary air ON. An inline check valve prevents air from escaping through the bleed valve when the pump is commanded ON.