Thank the EPA, they made the standard for the EVAP system so ridiculously high that people are going nuts and dropping tons of cash trying to correct a non-existent problem.
OBDII is a federal standard that requires vehicles to use its engine control computer to self-test the vehicle for meeting all federal emissions standards.
You are failing the evap test, because the Chrysler Test System is reacting like it has a leak. NOTE, I said the system is reacting like it has a leak, NOT, that it actually has a leak.
Of course the manufacturer is going to try to develop the cheapest most reliable system to perform this test. Its NOT done in a laboratory, but they need a laboratory like test performed on a moving vehicle. So they come up with this tortured system of a cheap vacuum pump, that actually pumps up over pressure in the fuel system, using engine vacuum controlled through a electric solenoid valve, and a little read switch and the computer monitors how often and how fast the diaphragms in the vacuum pump go back and forth at full deflection, to tell if there is a leak or NOT.
The computer has no idea what the pressure is in the fuel system and evap system, NOR whether there is a leak or NOT. All it knows is that diaphragms in the vacuum pump go up and down fast enough and stops moving within a certain time. If it doesn't, then there must be a leak.
Thats why they replaced the solenoid valve, it controls the vacuum pump.
I've replaced half the Evap system on my Neon R/T before the Evap CEL stopped coming back. It still comes back every once in a while, I clear it and it seems to go away for a year or two.
Its been a real problem for all the manufacturers, a vehicle gets an evap DTC and they can't figure out what is causing it, and even its a leak or NOT, or if its something in the detect system causing it to erroneously detecting a leak.
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