DTC P0410: Secondary Air Injection System: Description

Powertrain Control Module (PCM) activates the Secondary Air Injection (AIR) system by grounding both the AIR pump relay and the AIR vacuum control solenoid control circuits. This energizes AIR pump and AIR solenoid. Vacuum is then applied, opening the shutoff valves. AIR pump then forces filtered fresh air into the exhaust stream to accelerate catalyst operation. The PCM will run up to 3 diagnostic tests using the pre-catalyst HO2S voltage and short term fuel trim to diagnose the system. AIR system can be diagnosed during normal secondary air injection operation or the PCM can activate the system specifically for diagnostic purposes. If AIR system is operating properly, the Heated Oxygen Sensor (HO2S) voltage will decrease and the short term fuel trim will increase when system is activated.