K 1500 Yukon Denali AWD V8-6.0L VIN U (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 powertrain control module (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 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.
