General Information

The Throttle Actuator Control (TAC) system is used to improve emissions, fuel economy, and driveability. The TAC system replaces the mechanical link between the accelerator pedal and the throttle valve. The TAC system also eliminates the Idle Air Controller (IAC) valve, and the cruise control module. These systems are now controlled by the TAC module, integrated into the ECM. The TAC system contains the following components:
^ The Accelerator Pedal Position (APP) Sensors
^ The Throttle Position (TP) sensors
^ The throttle body assembly
^ Throttle actuator motor
^ The Engine Control Module (ECM)

Each of these components will be described briefly.