Operation CHARM
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GMC Truck
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1983
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C 1500 1/2 Ton Pickup 2WD V8-305 5.0L VIN F 4-bbl
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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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A/C Request - A/C Clutch
A/C Request - A/C Clutch
The scan switch displays the on and off status of the ECM
A/C signal
line. On condition indicates ECM command to energize compressor clutch.