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Pontiac
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1983
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J2000/Sunbird L4-121 2.0L
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Repair and Diagnosis
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Powertrain Management
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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.