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Home >> Oldsmobile >> 1990 >> Custom Cruiser V8-307 5.0L >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - 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.
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