Operation CHARM
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GMC Truck
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1999
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K 1500 Truck 4WD V8-5.7L VIN R
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Repair and Diagnosis
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Transmission and Drivetrain
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Transfer Case
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Description and Operation
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NVG 233/243-NP1 Two-Speed Selectable New Venture Gear
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Encoder Signal Check
Encoder Signal Check
The TCCM checks the encoder signal in order to verify that the
transfer case
is in either 2HI, 4HI, or 4LO.