Operation CHARM
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GMC Truck
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1982
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W Sprint/Caballero V6-229 3.8L
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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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Tools and Equipment
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Positions
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Ign/Crank-Ignition Switch Status
Ign/Crank-Ignition Switch Status
The crank mode (on) position engages the starter. The SCAN displays the on/off status of the
ignition switch
as it is transmitted to the ECM.