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Home >> Porsche >> 1987 >> 911 Turbo, 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> DME Control System >> Operation >> Engine Sensors >> Reference Mark Sensor
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Reference Mark Sensor

The reference mark sensor is located on crankcase flange. This sensor detects crankshaft position in relation to TDC, and sends this signal to the CU. It is triggered by a bolt cemented into the flywheel.