F 150 4WD V8-5.4L VIN V Flex Fuel (2007)
When a concern exists with the transmission, the PCM provides a command signal to the message center to display the transmission warning message.
Possible Causes
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Instrument cluster
Test E: The Check Fuel Cap Warning Is Inoperative
PINPOINT TEST E: THE CHECK FUEL CAP WARNING IS INOPERATIVE
E1-E2
Normal Operation
The powertrain control module (PCM) monitors the fuel tank evaporative emission system for significant leaks that occur following refueling of the
vehicle. Once the PCM detects a fuel vapor leak, the PCM sends the instrument cluster a message over the communication network to turn on the
check fuel cap warning message. DTC P0457 sets in the PCM following a successful cruise test, which is initiated when the vehicle is driven at a
steady speed above 64 km/h (40 mph) for a duration of approximately 4-5 minutes. If the PCM is unable to successfully run the cruise test, the
instrument cluster does not receive the check fuel cap message and the check fuel cap warning remains off. DTC P0457 sets in the PCM if a fuel tank
pressure change greater than -23.7 kPa (-7 in-Hg) of vacuum within 30 seconds after refueling occurs, or there is an excessive purge (fuel vapor) flow
of greater than 454 g (1.0 lb) per minute.
Possible Causes
-
Instrument cluster
Test F: The Message Center Switch Does Not Operate Correctly
PINPOINT TEST F: THE MESSAGE CENTER SWITCH DOES NOT OPERATE CORRECTLY
