Operation CHARM
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GMC Truck
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1988
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G 3500 1 Ton Van V8-379 6.2L DSL
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Repair and Diagnosis
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Powertrain Management
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Relays and Modules - Powertrain Management
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Relays and Modules - Computers and Control Systems
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Engine Control Module
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Testing and Inspection
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ECM Check
ECM Check
Fig. 42 ECM check. 1988:
