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GMC Truck
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2004
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Sierra 3500 2WD V8-6.0L VIN U
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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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Throttle Actuator Control (Tac) System
Throttle Actuator Control (Tac) System
POWERTRAIN CONTROL MODULE
The PCM determines the driver's intent, then calculates the appropriate throttle response. This information is sent to the TAC module through a dedicated serial data line.