Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hell Mr Pitbull2008. The gas engine on your vehicle has multiple emission system that it monitors constantly to verify that it will meet government requirments for tail pipe and evaporative emissions. When a particular test fails it will set a code in the computer to give a technician a diagnostic path to follow to find the cause, and subsequently turn on the lamp so that you know there is a fault. The following is a description of the evaporative emission system on your vehicle. Note that MIL means malfuntion indicator lamp.
Evaporative Emission (EVAP) Leak Check Monitor
The evaporative emission (EVAP) leak check monitor is an onboard strategy designed to detect a leak from a hole (opening) un the fuel tank and lines equal to or greater than 0.508 mm (0.020 in) in the enhanced EVAP system. The proper function of the individual components of the enhanced EVAP system as well as its ability to flow fuel vapor to the engine is also examined. The EVAP leak check monitor relies on the individual components of the enhanced EVAP system to apply vacuum to the fuel tank and then seal the entire enhanced EVAP system from the atmosphere. The fuel tank pressure is then monitored to determine the total vacuum lost (bleed-up) for a calibrated period of time. Inputs from the cylinder head temperature (CHT) sensor, intake air temperature (IAT) sensor, mass air flow (MAF) sensor, vehicle speed, fuel level input (FLI) and fuel tank pressure (FTP) sensor are required to enable the EVAP leak check monitor.
Note: During the EVAP leak check monitor repair verification drive cycle, clearing the diagnostic trouble codes (DTCs) bypasses the minimum soak time required to complete the monitor. The EVAP leak check monitor does not run if the key is turned off after clearing the DTCs. The EVAP leak check monitor does not run if a MAF sensor failure is indicated. The EVAP leak check monitor does not initiate until the heated oxygen sensor (HO2S) monitor has completed.
The EVAP leak check monitor is executed in 2 tests: the cruise test and the idle test. The cruise test executes when vehicle speed is above 64 km/h (40 mph). During this test the DTC P0455 is stored if a gross leak is detected, and the DTC P0422 is stored if a small leak is detected. When a very small leak is detected during this test the DTC will not be stored, however, the idle test is required to execute. The idle test starts only after a 6-hour key off soak and requires about 10 minutes to complete. The engine remains running, and the DTC P0446 is stored if the leak is present during this test. The engine returns to a normal operating mode after 10 minutes, regardless of the test result.
The EVAP leak check monitor is executed by the individual components of the enhanced EVAP system as follows:
Note: If the vapor generation is high on some vehicle enhanced EVAP systems, where the monitor does not pass, the result is treated as a no test. Thereby, the test is complete for the day.
You will have a diagnostic code stored in your powertrain control module, if you can get to an auto parts store like auto zone, most will do code scan for free, then I will most likely be able to tell you which system is causing the light and provide you with the tests that would be performed at the dealer level to fix the problem
give me a few minutes to check some things, I will return shortly
Ok, I have located a coulple pages from your owners manual which indicate that this is not a warning message that can be cleared by the owner and must be brought to the dealer for diagnosis. If you can retrieve the code, I can probably tell you why it comes and goes.
The acceleration controls consist of the accelerator pedal and bracket assembly.
The engine management system electronically operates the throttle of the engine in response to throttle pedal movements initiated by the driver. In the event of a system failure, the engine management system provides a "limp home" mode which allows the car to be driven with limited performance.