Fuel Gauge

The Powertrain Control Module (PCM) via the class II serial data line to the instrument cluster broadcasts the fuel level data. The instrument cluster compares the temperature 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.