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Home >> Subaru >> 1991 >> XT Standard >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Input Devices (Fuel Injection) >> Vehicle Speed Sensor
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Vehicle Speed Sensor

ECU supplies voltage signal to one side of a tiny reed switch, located in speedometer assembly. Speedometer cable revolutions open and close reed switch, providing ECU with CONTINUITY/NO CONTINUITY input. ECU converts this signal to vehicle speed.