EDIT: weak injector driver? other DME problems? PROBLEM FOUND!!!
02-08-2008, 08:45 AM
#16
Three Wheelin'
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Any time. Please make sure you look for why the transistor overheated, they fail for a reason. I would peal back the outside insulation of the harness going to the idle controller and look for cracked insulation. Next, the idle controller. It can be checked with a 12VDC battery ( with a fuse) for proper operation. Three wires, one is 12VDC, the other is valve closed when grounded , and the other is valve open when grounded. It could have shorted years ago and started a crack that slowly worked its way to what you see today. Just have to check to be sure. Simple but time consuming. Have fun.
I assume I have not missed any part of the system - no problems in wiring, new ISV (idle concern has been around for much longer than new ISV), and I will have either a new dme or repair the transistors in mine (have yet to decide which route to go for many reasons). Is there anything else that could cause me to be back in the same situation? I have been tracking this problem for awhile and in doing so have found the shorts in my ISV wiring (as you have suggested, but they have been repaired professionally - by me, I am an Audi registered technical specialist) and a leaking ISV which is why they have both been repaired first, leading me to where I am today in finding the circuit damage in the dme.
Thanks again and just let me know if there is anything aside from the dme, wiring, and ISV I need to worry about. I have a difficult time finding information regarding the dme which is essentially what has made this such a difficult diagnosis.
02-08-2008, 03:47 PM
#17
Nordschleife Master
If you need more info on the DME, this guy on pelican has posted a few detailed DME related threads. I think he also repairs them...
http://forums.pelicanparts.com/showthread.php?t=318906
http://forums.pelicanparts.com/showthread.php?t=318906
02-10-2008, 02:09 AM
#18
Because you have gone out of your way to help me I have been patient in responding to your numerous statements about "making sure I figure out why it overheated." Well if you would have just read my post completely you would have read that I have a entire wiring harness with no wiring problems and that no problems are suspect right now.
Short the ISV 12VDC lead in the harness to any other of the two ISV leads and you will damage the DME. I am done here.
Last edited by Bri Bro; 02-10-2008 at 05:48 AM.
02-10-2008, 07:31 PM
#19
Three Wheelin'
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Originally Posted by Brian Broderick View Post
That is easy to repair. New part costs under one $. I did a post a bit ago with details. There are two drivers, replace them both. The question that needs to be answered is what caused that transistor to overheat. The wires under the intake tend to get hard and the insulation breaks, causing shorts. If you just replace the DME, it could look like your current one in just a couple of seconds.
http://forums.rennlist.com/rennforum...ght=transistor
Originally Posted by badass951
I had found a short in the wiring harness near the connector of the ISV almost two years ago but it is fixed. The DME is not the one that originally went with this harness either so and has been opened numerous times for testing on other cars, etc. I know that every wire in my wiring harness has 0.2 ohms or less with clean connectors. I do not suspect any current problems that would cause another failure.
Originally Posted by Brian Broderick View Post
Any time. Please make sure you look for why the transistor overheated, they fail for a reason. I would peal back the outside insulation of the harness going to the idle controller and look for cracked insulation. Next, the idle controller. It can be checked with a 12VDC battery ( with a fuse) for proper operation. Three wires, one is 12VDC, the other is valve closed when grounded , and the other is valve open when grounded. It could have shorted years ago and started a crack that slowly worked its way to what you see today. Just have to check to be sure. Simple but time consuming. Have fun.
What's the deal here? I was very appreciative of the fact that you posting your similar findings on this issue and even made note of the fact. Now you are deleting posts, cutting out details from my posts, and making the all conclusive statement "I am done here." Are you mad? I was only pointing out the fact that you clearly overlooked my response to your initial concern for my dme damage by stating "I know that every wire in my wiring harness has 0.2 ohms or less with clean connectors," as you once again told me to check my harness for problems with your following post. I can understand if you were confused by my statement about the dme - I meant that the transistor damage could have been from a different 951 years in the past and may not have even been caused by the damage I found as it has been used on many cars. The only reason I continued to ask you if there was anything I needed to check other than the dme, isv, and wiring was because you told me to make sure I knew why the transistor overheated despite the fact that I already told you I checked and fixed all problems.
That is easy to repair. New part costs under one $. I did a post a bit ago with details. There are two drivers, replace them both. The question that needs to be answered is what caused that transistor to overheat. The wires under the intake tend to get hard and the insulation breaks, causing shorts. If you just replace the DME, it could look like your current one in just a couple of seconds.
http://forums.rennlist.com/rennforum...ght=transistor
Originally Posted by badass951
I had found a short in the wiring harness near the connector of the ISV almost two years ago but it is fixed. The DME is not the one that originally went with this harness either so and has been opened numerous times for testing on other cars, etc. I know that every wire in my wiring harness has 0.2 ohms or less with clean connectors. I do not suspect any current problems that would cause another failure.
Originally Posted by Brian Broderick View Post
Any time. Please make sure you look for why the transistor overheated, they fail for a reason. I would peal back the outside insulation of the harness going to the idle controller and look for cracked insulation. Next, the idle controller. It can be checked with a 12VDC battery ( with a fuse) for proper operation. Three wires, one is 12VDC, the other is valve closed when grounded , and the other is valve open when grounded. It could have shorted years ago and started a crack that slowly worked its way to what you see today. Just have to check to be sure. Simple but time consuming. Have fun.
What's the deal here? I was very appreciative of the fact that you posting your similar findings on this issue and even made note of the fact. Now you are deleting posts, cutting out details from my posts, and making the all conclusive statement "I am done here." Are you mad? I was only pointing out the fact that you clearly overlooked my response to your initial concern for my dme damage by stating "I know that every wire in my wiring harness has 0.2 ohms or less with clean connectors," as you once again told me to check my harness for problems with your following post. I can understand if you were confused by my statement about the dme - I meant that the transistor damage could have been from a different 951 years in the past and may not have even been caused by the damage I found as it has been used on many cars. The only reason I continued to ask you if there was anything I needed to check other than the dme, isv, and wiring was because you told me to make sure I knew why the transistor overheated despite the fact that I already told you I checked and fixed all problems.
