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GMC Truck
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2002
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K 1500 Truck 4WD V6-4.3L VIN W
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Repair and Diagnosis
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Relays and Modules
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Relays and Modules - Powertrain Management
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Relays and Modules - Computers and Control Systems
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Engine Control Module
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Description and Operation
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Powertrain Control Module (PCM) Description
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PCM Function
PCM Function
The PCM supplies a buffered voltage to various sensors and switches. The PCM controls most compartments with electronic switches which complete a ground circuit when turned ON.