MASS AIR FLOW(V)_________________________________________ (range not available) Indicates the actual voltage being read by the Mass Air Flow (MAF) sensor. This voltage is used by the ECM to calculate the maximum amount of air being drawn into the engine. MASS AIR FLOW(ACTUAL)(g/s)_______________________________ (range not available) Indicates the actual amount of air flowing into the engine as grams per second. Used on L 5.9.2 systems for measurement of reverse airflow at MAF sensor using two temperature sensors. Normal valve overlap and intake manifold design may cause reversion of airflow which results in incorrect rich mixture. Two similarly heated temperature sensors are ECM monitored in the MAF to detect differential temperatures.