System Fault Detection

The ECM monitors the secondary air injection system for faults during cold start operation. When the system's pressure or relay circuits operations vary too far from the expected values, a DTC will set. Diagnostics detect the following conditions:

• A partially or fully blocked or leaking secondary air injection system
• A malfunctioning secondary air injection pump
• A malfunctioning secondary air injection shutoff and check valve assembly
• A malfunctioning secondary air injection pressure sensor
• A restricted exhaust system
• A malfunctioning secondary air injection pump and secondary air injection valve relay

The following DTCs set when a secondary air injection system fault is detected:

• DTC P0411-A secondary air injection system insufficient airflow fault condition has been detected.
• DTC P0412-A secondary air injection valve relay coil circuit fault condition has been detected.
• DTC P0418-A secondary air injection pump relay coil circuit fault condition has been detected.
• DTC P2430-A secondary air injection pressure sensor signal stuck in range fault condition has been detected.
• DTC P2431-A skewed air injection pressure sensor signal has been detected.
• DTC P2432-A secondary air injection pressure sensor signal voltage below the minimum range of the sensor fault condition has been detected.
• DTC P2433-A secondary air injection pressure sensor signal voltage is above the maximum range of the sensor fault condition has been detected.
• DTC P2440-The shutoff and check valve is stuck open or a system leak between the pump and the valve has been detected.
• DTC P2444-A secondary air injection pump stuck ON fault condition has been detected.