Air Flow SensorsMass Air Flow sensors can produce a digital signal which has a frequency that proportional to the amount ofair entering the engine (Frequency Modulation). For example, a mass-air flow sensor may have a lowfrequency at an idle; however, the frequency will increase with increased air flow as engine speed increases.There are two types of digital mass air flow sensors:The sensor shown below uses the frequency of the digital signal to indicate the air flow rate. Thissensor requires an additional air temperature sensor in the intake ducting to monitor air
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