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Home >> Ford >> 2003 >> Excursion 5.4 L, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Theory & Operation - CNG, Flex-Fuel & Gasoline >> Computerized Engine Controls >> Output Devices >> Fuel Cap Off Indicator Light
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Fuel Cap Off Indicator Light

NOTE: Escape, Expedition, LS, Mustang, Navigator, Thunderbird, Town Car and Windstar do not have a dedicated output wire from PCM to instrument cluster. PCM commands Fuel Cap Off Indicator Light (FCIL) on and off through Standard Corporate Protocol (SCP) BUS (+) and BUS (-) circuits.

FCIL is an output signal controlled by PCM and will illuminate when it is determined there is a failure in vapor management system due to fuel filler cap not being sealed properly. This would be detected by inability to pull vacuum in fuel tank, after a fueling event.

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