Air Injection Pump: Description and Operation

The AIR pump is an electric regenerative turbine type which is permanently lubricated and requires no periodic maintenance.

The engine should be at a normal operating temperature in Neutral at idle. Monitor the HO2S 1 on the scan tool. Use the scan tool to enable the AIR system. The HO2S voltage should remain less than 350 mV because air is being added to the exhaust. If the HO2S voltage remains low during the Output Test, the AIR pump, the AIR solenoid valve, and the AIR control valves are operating satisfactorily.

Refer to the appropriate DTCs for diagnosis of the Emission Control Systems.