Blazer 4WD V6-4.3L VIN X (2005)
Engine Control Module: Description and Operation
Distributor Ignition (DI) System
POWERTRAIN CONTROL MODULE (PCM)
The PCM controls all ignition system functions, and constantly corrects the basic spark timing. The PCM monitors information from various sensor
inputs that include the following:
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The throttle position (TP) sensor
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The engine coolant temperature (ECT) sensor
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The mass airflow (MAF) sensor
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The intake air temperature (IAT) sensor
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The vehicle speed sensor (VSS)
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The transmission gear position or range information sensors
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The engine knock sensors (KS)