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Home >> Volvo >> 1998 >> S70 T-5, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Engine Speed (RPM) Sensor
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Engine Speed (RPM) Sensor

Edge of flywheel/carrier plate has a series of holes along its edge. As it passes RPM sensor, each hole induces a voltage in coil.