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Is it possible to have same pressure at both sensors?like if airflow sensor is reporting 16 grams/s then map should also report almost the same amount of air or vacuum pressure.for example:16 grm/s convert to Psi,kpa or mpa.
The two sensors measure completely different things, MAP measures pressure inside the inlet manifold ,
On a MAP engine the MAP sensor supplies a voltage signal to the PCM which together with other inputs (Air Intake Temperaure , Throttle Angle and Barometric Pressure ) the PCM uses to calculate the weight of air entering the engine.
On MAP engines the MAP sensor usually also used to supply the PCM with barometric pressure for calibration at initial key on.
On a MAF engine the Mass Airflow Senors mesures the weight of air entering the engine and feeds it as a voltage or frequency to the PCM.
MAF engines also have a MAP sensor sometimes built into the MAF. On many MAF engines this MAP sensor is used as a back-up strategy if the MAF fails or drifts outside calibration limits, which is why on many engines you can test for a bad MAF by simply disconnecting it.
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Last edit: 8 years 11 months ago by Andy.MacFadyen.
