EGR Problem p0401 p0402 both the codes

[paplu]

hi

i had these codes for about a month now.

here is what i have done.

cleaned egr valve.
engine dies when applied vaccum to egr @ idling speed

modulator cleaned .

well how to foolproof that its working?


vsv checked.

resistance is 39 ohms.
no air flow without voltage. looks like blocked.

applied 12V to terminals i did not hear any clicks.
well no air flow

i think its bad.

i am going to replace it today.

my question is how are he hose s connected to vsv and egr and modulator.
which one goes where?

there is a charcoal canister below the cruise control module.
and a hose runs to it too.

how is that connected.?

any help is really appreciated.

Thanks



UPDATE -: PROBLEM FIXED

[kmr16442]

Try this link

www.autoshop101.com/forms/h61.pdf

I just got the PO401 code on my Camry. I checked the EGR valve with a vacuum guage and it tested fine.

I used a Haynes manual procedure to check the modulator. They say to block the two ports that are together on the valve and blow air thru the single port with the engine off. You should get air flowing out the hole in the top of the modulator.

I then repeated the test with the engine at 2500 rpm and the book says the flow should be restricted. Mine wasn't at all. I also noticed when I pulled the modulator filter it had a black dot on the underside. Supposedly that could indicate the internal diaphram is blown. I think the test in the link above sounds more accurate.

I ordered the modulator and the VSV along with EGR valve gaskets. I didn't test the VSV but will replace it anyway while I take apart the EGR system for cleaning.

Good luck!

[paplu]

Originally Posted by kmr16442

Try this link

www.autoshop101.com/forms/h61.pdf

I just got the PO401 code on my Camry. I checked the EGR valve with a vacuum guage and it tested fine.

I used a Haynes manual procedure to check the modulator. They say to block the two ports that are together on the valve and blow air thru the single port with the engine off. You should get air flowing out the hole in the top of the modulator.

I then repeated the test with the engine at 2500 rpm and the book says the flow should be restricted. Mine wasn't at all. I also noticed when I pulled the modulator filter it had a black dot on the underside. Supposedly that could indicate the internal diaphram is blown. I think the test in the link above sounds more accurate.

I ordered the modulator and the VSV along with EGR valve gaskets. I didn't test the VSV but will replace it anyway while I take apart the EGR system for cleaning.

Good luck!

thanks

i will try it out after work.
hole on top of modulator??

do you mean that the opening that is at bottom of modulator where hose is used to connect to egr valve?
or
i have to open the modulator to do this test

[toyomoho]

What year and engine?

[paplu]

Originally Posted by toyomoho

What year and engine?

2001 2.2L

97-01 batch

how do i identifyy the engine model

[paplu]

Originally Posted by toyomoho

What year and engine?

5sfe

well i fixed the egr problem.

MIL is off

and all sensors are starting to run one by one .


thnaks