Diesel Data
: Automotive Repair
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Chevy Truck
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2002
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Express 1 Ton Van V8-5.7L VIN R
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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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PCM Function
PCM Function
The PCM supplies a buffered voltage to various sensors and switches. The PCM controls most components with electronic switches which complete a ground circuit when turned ON.