Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello, My name is ***** ***** I'm here to assist you today. Please give me a moment while I pull up the documents.
The GM document requires a signal generator to test the gauge operation by varying resistance to the instrument cluster. I suspect your issue is going the be the sending unit, but let me pull a schematic. He's the resistance reading the sending unit should have at different tank levels.
3.4l or 3.8l in your monte carlo?
Here's the diagnostic we're working with.
The 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 gauge defaults to E (empty) if the PCM detects a malfunction in the fuel level sensor circuit.