To adjust a throttle position sensor, turn the ignition switch off and on, connect the multimeter to the vehicle and rotate the sensor until it reaches the appropriate voltage. Instructions vary based on the make and model of the vehicle, so refer to the owner's manual for exact instructions.
When adjusting the throttle position sensor in 3.3-liter Nissan Pathfinder, XTerra and Frontier vehicles, ensure that the sensor is attached to its connectors. Turn the ignition off and on again without starting the engine. Set the multimeter to volts DC mode, and attach the red lead to the wire coming from the middle pin of the sensor. Place the black lead on the negative terminal of the battery.
Examine the reading while rotating the sensor until it reaches its specified output voltage, which is often between 0.3 to 0.7 volts DC. After adjusting the sensor, tighten the assembly's mounting bolts. Check the throttle position sensor once more before disconnecting the multimeter. If the multimeter shows no reading during testing, try wiggling the leads, and keep in mind that even minimal throttle movement changes the readings. This adjustment process is best performed when the vehicle has a fully charged battery. If the vehicle needs a new throttle position sensor, purchase a compatible sensor at an auto parts store or online.