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Home >> GMC >> 2004 >> Envoy XL 5.3 P, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.8L, 5.3L, & 6.0L - Introduction >> Description and Operation >> Throttle Actuator Control (TAC) System Description >> Powertrain Control Module
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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.

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