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Home >> Porsche >> 1983 >> 944 Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> DME Digital Engine Control >> Diagnosis & Testing >> Reference Mark Sensor Check

Reference Mark Sensor Check

NOTE: This is an alternate test when an oscilloscope is not available.
  1. Using same LED tester as used for speed sensor, connect positive lead to control unit harness connector terminal 25 and negative lead to terminal 26.
  2. Do not start engine, but operate starter. If sensor is sending a signal, LED should flicker dimly.
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