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Envoy 2WD V8-5.3L VIN P
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Relays and Modules - Powertrain Management
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Engine Control Module
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Description and Operation
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Throttle Actuator Control (Tac) System
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Throttle Actuator Control (Tac) System
POWERTRAIN CONTROL MODULE
The PCM determines the driver's intent and then calculates the appropriate throttle response. This information is sent to the TAC module through a dedicated serial data line.