Re: Camry EGR Valve, Code P0401
- From: Hachiroku ハチロク <Trueno@xxxxxxx>
- Date: Sat, 27 Mar 2010 16:45:46 -0400
On Sat, 27 Mar 2010 12:10:56 -0700, Jeff Strickland wrote:
"Hachiroku ????" <Trueno@xxxxxxx> wrote in message
news:holh7v$6jn$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Sat, 27 Mar 2010 09:21:42 -0700, Jeff Strickland wrote:I thought the EGR gets dirty and sticks. How do you clean it?
I have a friend with a Camry (an '01, give or take a year), that has
two codes stored that are both P0401. I'm not sure how the same code
can be
Common Problems that Trigger the P0401 code:
* Restriction in the EGR passages, usually caused by carbon buildup *
Lack of proper vacuum or electrical signal to the EGR valve * Lack of
proper EGR system feedback to the computer from the:
Manifold Absolute Pressure Sensor (MAP) Differential EGR
Pressure Feedback Sensor (DPFE) EGR Valve Position Sensor (EVP)
EGR Temperature Sensor
* The EGR Valve is defective
Then, start here:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=EC&P=12
A P401 can point to other things: bad vacuum flow; this happened on my
Tercel. Toyota tested the EGR (gratis) and said it was OK. I rectified
the issue by putting a switch on the ECM battery wire. Hit the switch,
clear the memory, drive the car two driving cycles and repeat.
Finally tracked the problem to a clogged vacuum line. At first we
thought it was the vacuum sensor (after the EGR) and then found the hose
to the sensor was clogged.
I'm discounting, for now, electrical or vacuum issues ONLY because if the
problem is a random occurance, this would seem to indicate a stich valve,
not missing signals or bad vac supply. Electrics or vac issues would be
less random and more constant. What I don't know at this moment is if the
problem IS random or not, and that would make a difference, I think. But I
want to start with cleaning the EGR, but I don't know what cleaner to use,
or if the valve can be cleaned in place or has to come off to be cleaned.
You've exhausted (no pun intended) the scope of my knowledge. I think you
just unbolt the thing and undo the vacuum lines. It can be tesetd by
blowing into it and doing the vacuum test.
The failure rate on these is pretty low, I would try other things first.
Of course, now that I have said that, it will be a bad EGR.
.
- References:
- Camry EGR Valve, Code P0401
- From: Jeff Strickland
- Re: Camry EGR Valve, Code P0401
- From: Hachiroku ハチロク
- Re: Camry EGR Valve, Code P0401
- From: Jeff Strickland
- Camry EGR Valve, Code P0401
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