Avalanche 2500 2WD V8-8.1L VIN G (2002)
Electronic Throttle Control Module: Description and Operation
THROTTLE ACTUATOR CONTROL (TAC) MODULE
Throttle Actuator Control (TAC) Module
The TAC module is the control center for the electronic throttle system. The TAC module and the PCM communicate via a dedicated redundant serial
data circuit. The TAC module and the PCM monitor the commanded throttle position and compare the commanded position to the actual throttle
position. This is accomplished by monitoring the APP and the throttle position (TP) sensor. These 2 values must be within a calibrated value of each
other. The TAC module also monitors each individual circuit of the TP sensor and the APP to verify proper operation.
