DTC Description: Notes

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.

NOTE: If DTC P2121-00 is displayed with any of the following DTCs, first perform the trouble diagnosis for other DTC:

P2122-00. Refer to DTC Description .
P2123-00. Refer to DTC Description .
P2127-00. Refer to DTC Description .
P2128-00. Refer to DTC Description .

The accelerator pedal position sensor is a potentiometer type sensor attached to the accelerator pedal assembly. The accelerator position sensor varies the signal voltage to the ECM as the accelerator pedal is depressed and released. Low signal voltage is received by the ECM when the accelerator pedal is at 0%. A high signal voltage is received by the ECM when the accelerator pedal is at 100%. The accelerator pedal position circuit contains an accelerator pedal position 5V supply, accelerator pedal return, and accelerator pedal position signal.

Courtesy of NISSAN NORTH AMERICA, INC.

The accelerator pedal position sensor contains two sensors. These sensors are used to measure the throttle position. Both position sensors receive a 5 volt supply from the ECM. A corresponding signal voltage based on the position of the accelerator pedal is then received from the ECM. The signal voltage for accelerator position 1 is twice as much as the signal voltage from the accelerator position 2.