Operation CHARM
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GMC Truck
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1988
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S15/T15 2WD P/U L4-151 2.5L
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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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Positions
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Desired RPM
Desired RPM
Indicates RPM to which ECM is trying to control
idle speed
.