DTC P0410: Secondary Air Injection System: Description

The control module activates the secondary Air Injection (AIR) system by grounding both the pump relay and the vacuum control solenoid control circuits. This energizes the pump and the vacuum control solenoid. Vacuum is then applied, opening the shut-off valves. The pump then forces filtered fresh air into the exhaust stream in order to accelerate catalyst operation. The control module will run up to three diagnostic tests using the pre-catalyst Heated Oxygen Sensor (HO2S) voltage and short term FT to diagnose the system. The control module can activate the system specifically for diagnostic purposes. If the system is operating properly, the HO2S voltage will decrease and the short term FT will increase when the system is activated. If a system air flow problem is detected, this Diagnostic Trouble Code (DTC) will set. When inactive, the system prevents air flow in either direction.