Frontier 2WD V6-3.3L (VG33E) (2003)
Throttle Position Sensor: Description and Operation
NOTE: If DTC P0121 is displayed with DTC P0510, first perform trouble diagnosis for DTC P0510.
The throttle position sensor responds to the accelerator pedal movement. This sensor is a type of potentiometer which transforms the throttle position
into output voltage, and emits the voltage signal to the ECM. In addition, the sensor detects the opening and closing speed of the throttle valve and feeds
the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation
such as fuel cut. On the other hand, the "Wide open and closed throttle position switch", which is built into the throttle position sensor unit, is not used
for engine control.