Originally Posted by kylakerider
how does the MAF sensor know that more air is going by? I thought it measures only a small area and then is "calibrated" for the air intake total area. Just wondering.
The MAF sensor is an important sensor. Gernerally speaking it's what your ECU/PCM uses to see how much air the engine is taking in and it's able to calculate the load (Volumetric efficancy) and keep your AFR (air/fuel ratio) inline... with the aid of a few other sensors input.
The sensor has a wire that is exposed to the incoming air that it keeps at a specific temp. The more air that comes in, the more voltage it needs to keep it at that temp. It's operating range, like any other sensor in the engine bay is 0-5V. The ECU/PCM has a value file for the MAF called the MAF transfer function that's like a graph so it can calculate the proper AFR.
Last edited by swazo; 07-31-2006 at 08:57 PM.