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Home >> GMC >> 1990 >> Forward Control 3.9 L >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Diesel) >> Vehicle Speed Sensor (VSS)

Vehicle Speed Sensor (VSS)

VSS sends a pulsing signal to ECM so can calculate vehicle speed. It is mounted on the transmission. This calculation is used to control TCC engagement.

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