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Home >> Audi >> 1982 >> 5000 S, 2.0L Eng VIN H, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Computerized Engine Control - Digital Timing Control >> Operation >> Data Sensors >> Reference Mark Sensor
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Reference Mark Sensor

The reference mark sensor, located on the left rear side of the engine block, is actuated by a flywheel pin (60° BTDC on No. 1 cylinder). It produces 1 impulse per crankshaft revolution. It works with the Hall sending unit to identify ignition TDC for the No. 1 cylinder.

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