The PCM (Powertrain Control Module) is responsible for the operations of the Accelerator Actuator Control (TAC) system. To do this, the PCM observes the Throttle Position Sensor (TPS) to determine driver intention, and then it proceeds to calculate the required throttle response. This is accomplished by pressing a voltage signal that can go up to two engines.
The main component of the CT system is the throttle body. It is located between the intake manifold and the air filter. It has 2 motors that move the plate and one or two TPS sensors, which tell the PCM where the throttle plate is located all the time.
The diagnostic code P2101 OBDII is set when the PCM detects performance problems in the signal from the motors that move the throttle plate. These do not match the voltage signal sent by the TPS sensors.