Code P0401 - Hyundai Forums : Hyundai Forum
 
LinkBack Thread Tools
#1 Old 08-23-2011, 12:05 PM
Junior Member
 
Join Date: Aug 2011
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Kestral
(Thread Starter)
On my 2001 2.4 Santa Fe, I have been seeing this code for a few weeks now, Insufficient EGR Flow. I have cleaned my EGR valve, reset the code, and 100 miles later, the code came back. I then took the EGR valve out to inspect it, and it looked plenty clean. I have a replacement EGR valve and gasket coming in tomorrow, hopefully it will fix the problem. But assuming it doesn't, what else could it be? Pep Boys also told me I may need to replace the EGR purge solenoid and the EGR canister. I hear it could also be that the DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced. These parts (solenoid, canister and DPFE) I have been unable to locate or identify, in the car or online. I will certainly follow up after I replace the EGR valve.
Kestral is offline  
Sponsored Links
Advertisement
 
#2 Old 08-23-2011, 01:02 PM
Senior Member
 
sbr711's Avatar
 
Join Date: Apr 2010
Location: hiding from those who might be looking for me
I dont own Hyundai car, I drive everybody else Hyundai during day
Posts: 8,912
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
sbr711 is an unknown quantity at this point
QUOTE (Kestral @ Aug 23 2011, 12:05 PM)
Quote:
On my 2001 2.4 Santa Fe, I have been seeing this code for a few weeks now, Insufficient EGR Flow.
Silly 2.4 & 3.5 with their EGR systems... 0401, easy code to deal with, just need to learn how system operates..

I have cleaned my EGR valve, reset the code, and 100 miles later, the code came back.
[b]Yep.. wrong repair attempt

I then took the EGR valve out to inspect it, and it looked plenty clean.
[b]Yep

I have a replacement EGR valve and gasket coming in tomorrow, hopefully it will fix the problem.
[b]Nope, but you already went and spent $$ for the special order parts, cost you to return them if they'll take them back..

But assuming it doesn't, what else could it be?
[b]That's TOO easy... What controls EGR valve action ??

PCM uses various bits of engine sensor info to determine if we want to use EGR.. so we will duty cycle the EGR SOLENOID to apply vacuum to EGR diaphram to open valve and inject recycled xhaust gas into intake/combustion chamber to cool the mix. We have a vacuum regulator that takes manifold vacuum down to 7 in, and it need to work proper at regulating vacuum for EGR operation.. The regulator has to freely support the 7 inch of vacuum,, not slowly draw it when you test the part.. the solenoid is simple electric/vacuum test of valve inside.

We have more or less got to point that we just sell the regulator and soleniod and be done with it, then drive with vacuum gauge tapped into tube at EGR valve and watch for vacuum apply on top of valve.


Pep Boys also told me I may need to replace the EGR purge solenoid and the EGR canister.
[b]EGR purge ?? Dont think so.. EGR canister ?? Me thinks Beavis and company need to attend some proper engine controls/drivabilty/advanced emissions training courses

I hear it could also be that the DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced.
[b]FORD--> YES,,, Hyundai -----> NO

These parts (solenoid, canister and DPFE) I have been unable to locate or identify, in the car or online. I will certainly follow up after I replace the EGR valve.
[b]Did I mention the EGR valve WILL NOT remedy the problem ??

Hyundai has a TSB in regard to EGR daignosis.. kinda drawn out in writing, but after you know what to look for as far as soleniod and regulator, you gots it remedied..

<--- please fill in the 'location' and 'what you drive' boxes on your personal profile page.
This information makes it much easier for other members to answer/comment on your posts.
sbr711 is offline  
#3 Old 08-23-2011, 09:16 PM
Senior Member
 
Join Date: Feb 2010
Location: Midwest USA
Drives 95 Geo Tracker Drives 02 Santa Fe
Posts: 131
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
revmup
Here is a sample of DIAGNOSIS. Pep Boys are not mechanics, they sell parts. Do not rely on the diagnosis of frankly idiots. If you can't get the info with your own scan tool, and manual, just go to the dealer, pay them to diagnose it, and buy the parts from them. How much were you willing to spend to go in a totally wrong direction? Sorry if I offended you, but when will we learn?
revmup is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hyundai Forums : Hyundai Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome