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Home >> Porsche >> 1986 >> 944 Turbo >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH AFC >> Testing >> Reference Mark Sensor Check

Reference Mark Sensor Check

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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 CU harness connector terminal No. 25 and negative lead to terminal No. 26.
  2. Operate starter, but do not start engine. If sensor is sending a signal, LED should flicker dimly.
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