Toyota Camry: DTC P0401

Make sure the egr valve is opening properly, if it is all carboned up it may
need to be replaced. Also make sure that the vsv is operating properly and
sending vacuum at the proper time. Btw it will only set egr codes when cruising
on the highway because thats the only time the egr operates.

Looks rather plain to me. The key word is "flow." The valve is not
operating physically or the flow thru the normally operating valve is
restricted (clogged delivery passage) severely.
--

* Philip

"I'm dreaming of a white Christmas,
Just like the ones I used to know"
-Bing Crosby


In news:w4GHb.251204$ops.worldnet.att.net,
IceMan <att.net> being of bellicose mind posted: 

"JonS999" <com> wrote in message
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up it may 
properly and 
when cruising 

VSV = Vacuum Solenoid Valve

For those of you who didn't know. ;-)

Thanks, I've already checked EGR valve and EGR Vacuum Modulator so my next
step is to check VSV and EGR pipe to the EGR valve and the exhaust system.

"JonS999" <com> wrote in message
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may 
cruising 

IceMan wrote:
 



Clean the EGR port at the throttle body, its plugged. Remove the valve
from the intake, dig out all the carbon. Remove the throttle body to
scoop out the chunks that break off inside. Its chocked full I bet. Seen
this a few times myself.

--





nasmuch as the Democrats are complaining on how long the war is taking,
consider this:

It took less time to take Iraq than it took Janet Reno to take the
Branch Davidian compound. That was a 51-day operation.

It took less time to find Saddam's sons in Iraq than it took Hillary
Clinton to find the Rose Law Firm billing records.

It took less time for the 3rd Infantry Division and the Marines to
destroy the Medina Republican Guard than it took Teddy Kennedy to call
the police after his Oldsmobile sunk at Chappaquiddick.

It took less time to take Iraq than it took to count the votes in
Florida! TWICE!!!!!

Damn our military is GREAT!!

The modulator valve is no longer working that cause PO401. I had mine just like that I changed the modulator cost me $76.00 (at dealer) after replacing it, you need to reset the computer by pulling the EFI fuse. Now working great no more Check Engine light.

Carbon deposits existed inside Air Intake Chamber (just after Throttle body)
where EGR port exists, also Throttle Body had varnish inside. Ports R & E
where clean.

Did procedure recommended by Philip to test EGR pipe to EGR valve and the
exhaust system, it was clean.

I hope this is all it was for P0401 otherwise I suspect it to be
intermittent, a VSV or EGR gas temp. sensor will be next.

Thanks,
IceMan.


"MDT Tech®" <com> wrote in message
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an 

Just curious, you mentioned carbon deposits. Where does the carbon deposits
come from? The Air Intake Chamber is before the combustion process which is
what creates the carbon.


"IceMan" <att.net> wrote in message
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body) 
on