Fuel Level Sensing

The PCM reads the fuel level sensor, filters the data, and then sends a fuel level Class 2 serial data message to the instrument cluster for display. The instrument cluster drives the fuel gauge pointer. The PCM is responsible for sending a fuel related Class 2 serial data message so that fuel level sensing is started when Ignition 0 is on, however the fuel level is not displayed until Ignition is on. This is done in order to reduce the latency of the fuel gauge display during key-on.

The BCM looks for the low fuel indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is on.