Operation CHARM
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GMC Truck
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1983
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S15/T15 2WD P/U L4-121 2.0L VIN Y 2-bbl
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Relays and Modules - Computers and Control Systems
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Engine Control Module
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Technical Service Bulletins
Engine Control Module: Technical Service Bulletins
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Engine - THIS BULLETIN HAS BEEN CANCELED
ECM - Knock Retard Data Stream Changes
A/T - Overheating Diagnosis
Engine Controls - ECM May Contain Wrong PROM
ECM - Revised Replacement Procedure