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The airflow sensor measures the air that goes into the engine through
the intake manifold.
A small air stream is diverted past two small wire coils. The first
wire coil is the temperature measuring coil. This coil measures the
air temperature. The second coil is the heating coil. This coil is
heated to a fixed level above the normal temperature by the computer.
As the diverted air cools the second coil, its resistance decreases.
The computer detects the change and boosts the current to the heating
coil so that it is restored to the correct temperature and
resistance. The amount of current required by the computer to keep
the coil at the right temperature indicates the rate of air flow.
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