Which system uses engine airflow to determine fuel injection levels?

The system that uses engine airflow to determine fuel injection levels is typically referred to as the RSA, or Rate of Specific Airflow system. This system operates by measuring the quantity of air entering the engine and using that data to calculate the appropriate amount of fuel that should be injected for optimal combustion.

This method allows for precise control of the fuel-air mixture, which is crucial for maintaining engine efficiency, performance, and emissions control. The RSA adjusts fuel flow based on real-time airflow measurements, ensuring that the fuel injection is matched to the engine's needs during various operating conditions.

In contrast, the TCM, or Throttle Control Module, focuses more on managing throttle position and other engine performance parameters rather than directly measuring airflow for fuel injection purposes. While both systems play important roles in fuel management, the RSA is the specific system designed to rely on airflow data for determining fuel injection levels.