•  The APP sensor is a potentiometer type and works is the same way as the throttle position sensor.

•  The APP sensor contains two circuits for detecting accelerator position: main circuit and monitor circuit. The main circuit is used for the controls operated by the PCM (e.g. fuel injection amount control). The monitor circuit is used for detecting malfunctions in the APP sensor.

•  When voltage difference between the main and monitor circuits increases, the PCM determines that the APP sensor is malfunctioning and stores DTC. Thus, a detection condition item has been added to DTC.

•  The input voltage characteristic of the APP sensor is as shown.