DTC P0462: Fuel Level Sensor Circuit Low Input Or DTC P0463: Fuel Level Sensor Circuit High Input: Description
WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the ECM. It consists of 2 parts, one is mechanical float and the other side is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.
ECM receives 2 signals from the fuel level sensor circuit. One is fuel level sensor power supply circuit, and the other is fuel level sensor ground circuit. This diagnosis indicates the former, to detect open or short circuit malfunction.