DTC P0410: Secondary Air Injection System: Description
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Control module activates secondary Air Injection (AIR) system by grounding both pump relay and vacuum control solenoid control circuits simultaneously. This energizes AIR pump and vacuum control solenoid. Vacuum is then applied, opening valves. Pump then forces fresh air into exhaust stream in order to accelerate catalyst operation. Control module will run up to 3 diagnostic tests using pre-catalyst Heated Oxygen Sensor (HO2S) voltage and Short Term Fuel Trim (STFT) to diagnose system. System can be diagnosed during normal secondary air injection operation or control module can activate system specifically for diagnostic purposes. DTC sets when an airflow problem is detected. When inactive, system prevents airflow in either direction.