Sensor Questions?

[Edward Hernandez R]

"The solution to this is the MAF (mass air flow) sensor. Instead of measuring the percentage of maximum flow, it measures the actual amount of air that enters the engine. After some corrections for air temperature (simple) the ECM can then calculate the required amount of fuel."
   Mass Air measurement, at least with a hot wire, does not require temperature correction. That's the beauty of hot wire MAF systems: they measure mass flow rate of air, which is not dependent on temperature. If you measure volume flow rate of air(like Karmen vortex devices), you must measure the air's pressure and temperature before you can calulate it's density and therefore it's mass. That's why such devices have ACT(air charge temp) and BAP(barometric absolute pressure) built into them. Hot wire MAFs do not have these additional sensors.