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The Mass Air Flow (MAF) Sensor (Figure 13) directly measures the mass of the air flowing into the engine. The sensor output is a DC (Analog) signal ranging from about 0.5 volts to 5.0 volts used by the processor to calculate the injector pulse width for stoichiometry. The sensing element is a thin platinum wire wound on a ceramic bobbin and coated with glass. This "hot wire" is maintained at 200°C (392°F) above ambient temperature as measured by a constant "cold wire".
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