Fuel Gage
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The IPC displays the fuel level as determined by the PCM. The IPC receives a discrete input from the PCM indicating the fuel level percent. The fuel gage defaults to empty if the PCM detects a malfunction in the fuel level sensor circuit.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.