Did you use factory OEM parts especially the gas cap ?
"Raddion" <raddion@[EMAIL PROTECTED]
> wrote in message
news:WUvRj.11310$2g1.8789@[EMAIL PROTECTED]
> Hi everyone
>
> I am a tech at a Dodge Dealer, been trying to fix an ongoing problem
with
> my
> daughter's 2000 Nissan Altima, 4 cylinder sedan. It keeps turning on the
> check engine light with fault code P0440 "Large Leak Detected" relating
to
> the evap system. At first, the code would be accompanied by P1448
> "cannister
> vent valve stuck open" code but, after I replaced the (expensive) valve,
> located at the vapor cannister, the only recurring code is "Large Leak".
I
> replaced the gas cap, and I used a smoke generator machine to test for
> actual leaks, but found none. I tested the "Purge Volume Control Valve"
in
> the engine compartment and found it to be operational. I verified that
the
> proper voltage is available at all the little doo-hickeys and solenoids
> under the vehicle that are involved in the evap system, leaving only the
> ECU
> to supply ground for the tests to run - but have no idea if it is
because
> I
> don't have a proper Nissan scan tool to force tests. I know the damn
thing
> *can* pass the Large Leak test because at one point it turned its own
> light
> off for a couple of days.
>
> Anyway, the car thinks it has a large evap leak, but as far as I can
tell
> it
> doesn't, any ideas or prior experience with a problem like this greatly
> appreciated, thanks.
>
>
>
> Raddion
>
>
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