Mass air flow bench test

kraber1

can some one tell me how to bench test a mass air flow sensor

thecardoc3

Very doubtful that someone can. But that isn't necessary anyway. The software in the PCM crosschecks the mass air sensor signal against the engine speed and throttle position, while calculating the engine's theoretical load which it uses to calculate the base injector pulse width. Top technicians use the serial data from the computer that they can monitor (and record) with a scan tool and use the calculated load pid data and combine that information with any fuel trim correction as required and that shows them exactly what the mass air flow sensor is reporting as compared to the actual airflow.