Results of Incorrect Operation
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) monitors the Secondary air injection (AIR) System for faults during cold start-up operation. When the system's pressure or relay circuits operations vary too far from the predicted values, a DTC will set. Diagnostics detect the following conditions:
- A partially blocked or leaking AIR system
- A malfunctioning AIR pump
- A malfunctioning AIR control solenoid valve/pressure sensor assembly
- A malfunctioning AIR pressure sensor
- A restricted exhaust system, forward of the catalytic converter
- A malfunctioning AIR pump and AIR valve relay
The following DTCs set when an AIR system fault is detected:
- DTC P0411-An AIR system insufficient airflow fault condition has been detected.
- DTC P0412-An AIR valve relay coil circuit fault condition has been detected.
- DTC P0418-An AIR pump relay coil circuit fault condition has been detected.
- DTC P2430-An AIR pressure sensor stuck in range fault condition has been detected.
- DTC P2431-An AIR pressure sensor range/performance fault condition has been detected.
- DTC P2432-An AIR pressure sensor signal voltage below the minimum range of the sensor fault condition has been detected.
- DTC P2433-An AIR pressure sensor signal voltage is above the maximum range of the sensor fault condition has been detected.
- DTC P2440-An AIR system airflow leak fault condition has been detected.
- DTC P2444-An AIR pump stuck ON fault condition has been detected.