Join Date: Jan 2014
Location: South Central PA
On a 2011, the y/w wire is the circuit to the gauge, it also runs to the speedo head. The speedo head looks for a specific resistance to ground, something greater than 170 ohms. So it then uses that to estimate that there is 1 gallon of fuel left and turns the lamp on.
I don't have a diagnostic manual on a 07, but I suspect it uses the same parameters, since they usually go with whatever Delphi suggests.
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