DTC P0410: Secondary Air Injection System: Description

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.