DTC P1415 & P1416: Air System - Bank 1 & 2: Description

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

The Secondary Air Injection (AIR) system is designed to lower exhaust emission levels after engine start up. The AIR pump is commanded on for a specific amount of time. The Powertrain Control Module (PCM) commands the AIR pump relay on, by supplying a ground to the AIR pump relay control circuit. This action energizes the AIR pump which forces fresh air into the exhaust stream. The PCM also commands the AIR vacuum control solenoid valve on by suppling a ground to the control circuit. With the AIR solenoid activated, engine vacuum is then applied to the AIR shut-off valves. Fresh air from the AIR pump then enters into the exhaust stream. The air that is introduced into the exhaust system accelerates catalyst operation reducing exhaust emission levels. When inactive, the shut-off valves prevent airflow in either direction.

After a warm start up the PCM can detect an AIR system airflow fault by monitoring the Heated Oxygen Sensors (HO2S) and short term Fuel Trim (FT) values. This is called a passive test. If the passive test indicates a pass, the PCM takes no further action. If the passive test fails or is inconclusive, the diagnostic will proceed with an intrusive or active tests. The PCM will command the AIR system on during Closed Loop operation. The active test will pass or fail based on the response from the HO2S sensors. The active test consist of 3 tests run at 3 second intervals. A lean HO2S response indicates that the secondary AIR system is functioning properly. An increasing Short Term FT value also indicates a normal functioning system. The secondary AIR diagnostic consists of the combination of the passive and the active tests. If the PCM detects that the HO2S and short term FT did respond as expected on either bank 1 or bank 2, DTC P1415 or P1416 sets.

The AIR system dual bank failure (DTC P0410 sets).
The AIR system bank 1 failure (DTC P1415 sets).
The AIR system bank 2 failure (DTC P1416 sets).

The AIR system consists of the following components:

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