Check Fuel Cap Indicator
NOTE:
The check fuel cap indicator on the Ranger 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.