Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Diagnostic Trouble Code Description:
Fuel Level Output Circuit
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0656
Circuit / System Description
The engine control module (ECM) uses the fuel level input from the fuel level sensor to calculate expected vapor pressures within the fuel system. Vapor pressure will vary as the fuel level changes. Vapor pressure is critical in determining if the evaporative emission (EVAP) system is operating properly. Fuel level is also used to determine if the fuel level is too high or too low to be able to accurately detect EVAP system faults.
