DTC P0410: Secondary Air Injection System: Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The secondary Air Injection (AIR) pump used on this vehicle in order to lower the tail pipe emissions during start-up. The AIR system consists of the following components:

The AIR pump.
The shut-off valves.
The vacuum control solenoid valve.
The system hoses and piping.
The AIR relay, the fuses, and the related wiring.

The Powertrain Control Module (PCM) uses the AIR relay in order to control the AIR pump. The PCM also controls the AIR vacuum control solenoid valve that supplies a vacuum to the AIR shut-off valves. When the AIR system is inactive, the AIR shut-off valves prevent air flow in either direction. When the AIR system is active, the PCM applies ground to the AIR relay, and to the vacuum control solenoid valve. Fresh air flows from the pump, through the system hoses, past the shut-off valves, and into the exhaust stream. The air helps the catalyst to quickly reach the normal working temperature, lowering the tailpipe emissions during a start-up. The PCM tests the AIR system for the following conditions:

The overall AIR system, including both banks, resulting in DTC P0410.
The AIR system bank 1, resulting in DTC P1415.
The AIR system bank 2, resulting in DTC P1416.
The AIR relay, resulting in DTC P0418.
The AIR vacuum control solenoid, resulting in DTC P0412

The PCM runs a passive test and an active test in order to diagnose the AIR system. Both tests involve a response from the fuel control Heated Oxygen Sensors (HO2S), HO2S bank 1 sensor 1 and HO2S bank 2 sensor 2. If both passive tests pass, the PCM takes no further action. If either part of the passive test fails or is inconclusive, the PCM initiates the active tests. If the PCM determines that the HO2S voltages did not respond as expected during the tests, DTC P0410 sets.