Accelerator Pedal Position Sensor

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 transmits 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.

NOTE:

When one of the accelerator pedal position sensors has a malfunction, ECM uses a signal from another accelerator pedal position sensor.

In this case, ECM controls as follows.

Limits throttle valve angle to approximately 60% or less
Delays the throttle valve opening speed
Fixes engine speed at an idling standard value when the brake pedal is depressed
Fixes idle speed