Fuel Gauge

The Powertrain Control Module (PCM) broadcasts the fuel level data via the class 2 serial data line. The instrument cluster compares the fuel data using a 16 point look-up table in order to determine the needle deflection. A smooth filter is used in order to secure a continuous response. The instrument cluster may determine if a low fuel condition is present. In the event of a low fuel condition, the following conditions may occur:
^ The instrument cluster shall activate the LOW FUEL indicator.
^ Send a chime message to the Body Control Module (BCM).

The instrument cluster may drive the fuel gauge to E (empty) under the following conditions:
^ The fuel level data is lost.
^ The PCM is in a state of health fault.