Operation CHARM
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Dodge or Ram Truck
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1993
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D 250 Pickup L6-359 5.9L DSL
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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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Functional Operation
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Inputs and Outputs
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SCI Transmit
SCI Transmit
Serial Communication Interface (SCI) circuits are used for communication. The PCM uses these circuits to communicate with the scan tool and vice versa.