Electronic Throttle Control Module: Description and Operation

THROTTLE ACTUATOR CONTROL (TAC) MODULE

The throttle actuator control (TAC) module is the control center for the TAC motor. In order to control engine speed, the TAC module receives a target value for throttle valve position and attempts to position the throttle valve accordingly. The TAC module achieves the correct throttle position by commanding the throttle control motor to position the throttle valve at the target value. The TAC module then sends the throttle position (TP) sensor 1 signal to the powertrain control module (PCM). The PCM then compares the TP sensor value to the target value. If necessary, the PCM sends a revised target position to the TAC module and the throttle control motor is moved slightly in order to obtain the exact desired position. The TAC module, motor, or TP sensor are not serviced separately and must be replaced with the throttle body assembly.