Operation CHARM
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Buick
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1982
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Regal V6-231 3.8L VIN A 2-bbl
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Repair and Diagnosis
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Relays and Modules
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Relays and Modules - Powertrain Management
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Relays and Modules - Ignition System
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Ignition Control Module
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Description and Operation
Ignition Control Module: Description and Operation
PURPOSE
The "R" terminal on the 7 pin ignition module provides reference pulses to the ECM indicating engine RPM and crankshaft position.