need help diagnosing p1404 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-29-2012, 12:28 PM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2012
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
berndog67 is on a distinguished road
Default need help diagnosing p1404

need help diagnosing my moms car to get it inspected, now it has the dreaded p1404 code, now im following the diagnostic test that ive seen on here from searching (links at the bottom of post), and everything checks out perfect and the original egr and a spare replacement one i have all spec out the same, installed on the car or on the bench, now the only thing that doesnt check out is the 10-12 volts the egr is supposed to get from test 2, but of course that is where i dead end, im unsure where to proceed, any tips or advice on where to continue to find out why its not getting the 10-12 volts?

now im hitting my auto parts store in a min to grab a hayes manual, cuz i want to be sure im testing the right wire for the test 2, cuz there is 3 light gray wires, 1 brown and 1 black, unlike all the pics and diagrams ive seen online, where there should be 1 pink, 1 black, 1 brown and 2 gray

i guess i should also state that there are no other codes or problems with the car, this p1404 code i was told is intermittent, so im pretty sure i can catch the window and get it passed, but i would rather find the problem and fix it, and also last year that i put in a new cat, egr, all intake manifold gaskets, upper intake manifold, coolant bypass tubes, etc...
berndog67 is offline   Reply With Quote
Old 08-29-2012, 12:37 PM   #2
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

What is the car?
Mike is offline   Reply With Quote
Old 08-29-2012, 12:38 PM   #3
Junior Member
Thread Starter
 
Join Date: Aug 2012
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
berndog67 is on a distinguished road
Default

my bad, 99 regal 3.8
berndog67 is offline   Reply With Quote
Old 08-29-2012, 12:40 PM   #4
Junior Member
Thread Starter
 
Join Date: Aug 2012
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
berndog67 is on a distinguished road
Default

berndog67 is offline   Reply With Quote
Old 08-29-2012, 12:42 PM   #5
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Mike is offline   Reply With Quote
Old 08-29-2012, 12:47 PM   #6
Junior Member
Thread Starter
 
Join Date: Aug 2012
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
berndog67 is on a distinguished road
Default

dont need to, the egr tested fine every way possible, even compared the specs with the new replacement one i bought in case i needed it, so the egr is fine, the ONLY thing wrong after performing every test on the diagnosing procedures is that the egr isnt getting the 10-12 volts from the pcm its supposed to get when the ignition is in the on position but not running, and to my knowledge there are no electrical problems with the car other than this
berndog67 is offline   Reply With Quote
Old 08-29-2012, 01:10 PM   #7
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Have you conducted that test WITH the engine running?
Mike is offline   Reply With Quote
Old 08-29-2012, 01:37 PM   #8
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

I didn't think the EGR operated with KOEO, or even at idle.
2kg4u is offline   Reply With Quote
Old 08-29-2012, 02:19 PM   #9
Junior Member
Thread Starter
 
Join Date: Aug 2012
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
berndog67 is on a distinguished road
Default

Quote:
Originally Posted by Mike1995 View Post
Have you conducted that test WITH the engine running?
im assuming your referring to the diagnostic test u recommended, and as i said, im not going to try that test, when i have already done a way more in depth testing procedure, nearly 2 hrs worth, and the only thing wrong in no voltage coming from the pcm, im asking if anyone has had similar problem, what they did to fix it, or what could it possibly be, any common pinch points in the engine bay harness to looks for a break in that one wire, common connections associated with the egr that could be bad or any relays, fuses, grounds to check, etc... because im not finding any reason for no power to egr from pcm so far
berndog67 is offline   Reply With Quote
Old 08-29-2012, 02:20 PM   #10
Junior Member
Thread Starter
 
Join Date: Aug 2012
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
berndog67 is on a distinguished road
Default

Quote:
Originally Posted by Mike1995 View Post
Have you conducted that test WITH the engine running?
im assuming your referring to the diagnostic test u recommended, and as i said, im not going to try that test, when i have already done a way more in depth testing procedure, nearly 2 hrs worth, and the only thing wrong is no voltage coming from the pcm, im asking if anyone has had similar problem, what they did to fix it, or what could it possibly be, any common pinch points in the engine bay harness to looks for a break in that one wire, common connections associated with the egr that could be bad or any relays, fuses, grounds to check, etc... because im not finding any reason for no power to egr from pcm so far
berndog67 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need some help diagnosing a Problem noise. 2000SilverBullet 1992-1999 8 11-22-2007 12:37 AM
Some problems I need help diagnosing <tS>Ace*Of*Spades General GM Chat 1 09-07-2007 11:13 PM
Need help diagnosing a code my car threw. (92 LeSabre) kalinodark 1992-1999 5 07-04-2004 01:30 PM
strange noise - need help diagnosing billha General GM Chat 7 04-21-2004 02:26 AM
Need Help Diagnosing Cruise Problem on 94 mikeblue94 Everything Electrical & Electronic 5 04-16-2004 02:00 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:45 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.