Operation CHARM
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Buick
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1987
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Somerset V6-181 3.0L
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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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Function Selector Positions
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Wastegate Actuator
Wastegate Actuator
Indicates duty cycle of ECM command to
turbocharger
boost pressure control as percentage.