Low Idle Airflow Test: Notes

When the cold start emission reduction monitor is enabled, the idle air control system requests a higher RPM, elevating engine airflow. While this cold start emission reduction elevated airflow is requested, the low airflow test compares the measured idle airflow from the mass air flow (MAF) sensor to the commanded idle air control strategy. For the purpose of detecting low airflow failures, the low airflow test uses the measured airflow and the commanded airflow to create a low airflow index.