MAP-CONTROLLED IDLE SPEED _____________________________ (range not available) Indicates the pre-mapped working range of the idle speed control (ISC). It shows the idle stabilization characteristics the ECM should use fora given set of operating conditions. MASS AIR FLOW(g/s) _______________________________________ (range not available) Indicates mass airflow (MAF) in grams per second. Most port fuel injection engines have an airflow sensor to measure the mass or weight of air entering the engine. The airflow sensor delivers a signal that indicates the mass airflow in grams per second at any given instant. The ECM uses the signal from the airflow sensor and other sensors to determine the air/fuel ratio needed by the engine and the amount of fuel to be injected.