Description & On Board Diagnosis Logic
WARNING: This page is about a different car, the 2003 Infiniti M45. 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 a mechanical float and the other side is a variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.
Driving long distances naturally affects fuel gauge level. This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has been driven. For on board diagnosis logic, see Fig 1 .