The Throttle Actuator Control (TAC) Module, also known as the Electronic Throttle Control (ETC) Module, is responsible for controlling engine speed based on information provided by the Powertrain Control Module (PCM). The principal component of the TAC/ETC is the throttle body that is found between the intake manifold and the air cleaner, which generally has one or two motors that move the throttle plate and one or more throttle position sensors that tell the PCM where the throttle plate is located.
The Throttle Actuator Control Module and the Powertrain Control Module establish constant communication through dedicated serial data circuits, which are separate from other serial data circuits. Both sending and receiving data must be accurate, and to achieve this requires circuit integrity as well as sufficient voltage. If these factors are not present and cause a communication failure between the two modules, the fault code U0107 OBDII will be set.