Fuel Gauge

The instrument cluster monitors a discrete input from the fuel level sender in order to determine the fuel level. The raw fuel level data is filtered for gauge display purposes. The instrument cluster has the following 2 filter modes:
^ A slow (heavy) filter
^ A fast (light) filter

A slow (heavy) filter is used whenever the vehicle is not in PARK. The slow filter prevents fuel slosh from affecting the gauge.

A fast (light) filter is used whenever the vehicle is in PARK. The fast filter allows the gauge to respond quickly when the vehicle is being fueled.

The instrument cluster also sends raw fuel level data to the PCM through a class 2 serial data line.