I have used BOSCH air flow meter and when it was connected to power first it gave output voltage of 1.08 volts.When I've been blowing into sensor it changed its voltage up to 3 volts but camra only could capture 1.73 volts reading (bloody camera cant work that fast)
This sensor change resistance with air mass passing it and cooling down sensor wire, inside mass air flow meter is a resistor group called Winston bridge, which measures 2 points resistance output, compare them and take a decision what to do, that thing called ECU-electronic control unit(computer easy words).
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