Accelerator Pedal Position Sensor (APP) and Throttle Motor

The APP sensor monitors the position of the accelerator pedal and transmits this information to the ECM. The ECM processes the signal along with data transmitted from other systems (such as ABS and traction control) to calculate the control signal for the throttle motor. A closed-loop control circuit ensures precise adjustment of the throttle angle in a process based on signals transmitted to the ECM from a potentiometer within the TP sensor.

The ECM continuously monitors all components to ensure that the system is operating properly. Because the ECM and all sensors have backup units (redundancy), the system can compare the signal pairs to verify the monitoring process.