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Home >> Chevrolet >> 1990 >> Caprice V8-307 5.0L >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Control Module >> Description and Operation >> Distributor Reference Signal
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Distributor Reference Signal

Ignition Module:






The "B" terminal on the 7 pin ignition module provides reference pulses to the ECM indicating engine rpm and crankshaft position.