Operation CHARM
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GMC Truck
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1987
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Jimmy Full Size V8-350 5.7L
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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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Ignition/Crank - Ignition Switch Status
Ignition/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.