Operation CHARM
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GMC Truck
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1989
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C 1500 Truck 2WD V6-262 4.3L
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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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Description and Operation
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Operating Modes
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Acceleration Mode
Acceleration Mode
In the Acceleration Mode, the ECM senses rapid change in throttle position and manifold pressure and provides a corresponding amount of added fuel.