Accelerator Pedal Position Sensor
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The accelerator pedal position (APP) sensor is installed on the upper end of the accelerator pedal assembly. The sensors detect the accelerator pedal position and send a signal to the ECM. The ECM uses the signal to determine the amount of fuel to be injected.
 Courtesy of NISSAN NORTH AMERICA, INC.
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