Expedition 4WD V8-5.4L VIN 5 (2006)
Fuel Filler Cap Warning Indicator: Description and Operation
CHECK FUEL CAP INDICATOR
NOTE: The check fuel cap indicator on the Hanger is a dedicated output signal that is controlled by the PCM.
The check fuel cap indicator is a communications network message sent by the PCM. The PCM sends the message to illuminate the lamp when the
strategy determines that there is a failure in the vapor management system due to the fuel filler cap not being sealed correctly. This would be detected by
the inability to pull vacuum in the fuel tank, after a fueling event.
