Operation CHARM
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GMC Truck
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1983
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G 3500 1 Ton Van L6-250 4.1L VIN D 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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Testing and Inspection
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Scan Tool Testing and Procedures
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Test Positions
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Batt
Batt
On some systems this position is used to monitor battery voltage.