Fuel Gauge: Description and Operation
FUEL GAGEThe IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message 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.
- The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates. Reviewing the fuel system description will further explain how the system functions. Refer to Fuel System Description in Computers and Control Systems 6.0L (LQ4).