Operation CHARM
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2002
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S10/T10 Blazer 2WD V6-4.3L VIN W
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Description and Operation
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Powertrain Control Module
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Powertrain Control Module (PCM) Description
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PCM Function
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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.