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Title: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on June 18, 2012, 09:18:06 PM ive seen a few of these ecu's. the rear o2 wires short out due to bad downpipe placement, ect.
the end result is an ecu that does not work the throttle. i have tried replacing the 30348 ic on the board but that did not seem to fix the problem. i checked the board over for other obvious faults but coudlnt find any. does anyone know where the fault lies? :) Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on June 18, 2012, 10:00:09 PM is it a mosfet problem? would seem to make sense since looking at that diagram a mosfet controls the wb heater.
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: DonSupreme on June 22, 2012, 08:20:12 AM When the ecu is placed/running in the car does it throw any codes?
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: robin on June 29, 2012, 12:06:39 PM I've seen this happen a few times, usually the ECU will have a little scorch mark on the underside underneath the Eprom. Never bothered trying to fix, simply got another ECU and cloned it.
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: masterj on June 29, 2012, 12:25:08 PM Does ECU holds ~1000 rpm? Check group 60 and see if the throttle body adaptation will start. If not then say bye bye to your ecu and get a new one. I accidently touched wrong pin for boot mode and ecu responded with the dead accelerator pedal. Had to replace ecu since it was unrepairable (possibly damaged processor or other blocks). Just change ecu, it will be much cheapier and easier ;)
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on June 29, 2012, 12:27:10 PM but its not cheaper if i already have a few spare ecus i can ri parts off of. :)
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: masterj on June 29, 2012, 01:12:26 PM but its not cheaper if i already have a few spare ecus i can ri parts off of. :) Well, start with the processor chip then try to resolder one by one every chip on board with chips from spare ecus... Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on June 29, 2012, 01:13:23 PM that sounds like too much work. there are lots of diodes, caps, resistors, ect that would be blown as well.
ive looked over and over this ecu though and im thinking the best would be to change the cpu. Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: masterj on June 29, 2012, 01:20:17 PM that sounds like too much work. there are lots of diodes, caps, resistors, ect that would be blown as well. ive looked over and over this ecu though and im thinking the best would be to change the cpu. Told ya :) I was thinking same thing but then bought another ecu :d Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on June 29, 2012, 02:44:43 PM eh, id still rather fix it. :) i hate replacing. id rather fix.
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: parts_hoarder on July 05, 2012, 08:43:06 PM I had an ME7.1.1 from VW 24V with this exact problem and cause. I always figured the ECU was NFG, but a friend later cloned his ECU to that box and its been working ever since.
Try reflash before labotomy. Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on July 05, 2012, 08:50:41 PM i dont see how that could be it as i ripped an apr chip from an ecu with these symptoms and soldered it to a new board and it worked fine.
its most definitely hardware. Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: parts_hoarder on July 05, 2012, 11:00:19 PM your probably right, hardware issue is what I suspected right away too. It's just strange how different software brought it back to life in my case.
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: BDK on July 06, 2012, 03:02:29 PM I had one where I added grounds externally to verify the ecm was in fact the problem. By the wiring diagram it looks like pins 33 and 36 which are grounds for the accelerator pedal assembly. I remember being able to see the effect in mvb 62. I still have the ecm somewhere, if I can find it I'll take a look but I would try to trace back those ground pins in the ecm. For what it's worth the car ran and drove fine with the hack extra grounds, but if it was my car I would want to fix it right.
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on July 06, 2012, 03:32:29 PM so you ran a jumper from the throttle body > ground? is that what youre saying?
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: nautica on July 07, 2012, 12:51:59 PM I have solved the half of the problem. Shorted the pins shown on the photo and got the accelerator pedal to work. After that I got the boost pressure sensor issue, car runs well but with only 300mbar of boost. Finally I bought a new ECU, cloned and instaled. Everything works well till the second day when the new ECU also blow. Problem may be was in second O2 sensor, removed....but now I'm afraid to instal a new ECU not to break him. What you can suggest?
(http://i009.radikal.ru/1207/21/dfa796ff6054.jpg) (http://s004.radikal.ru/i208/1207/47/fc19fe567073.jpg) Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on July 07, 2012, 01:13:34 PM score. narrowing it down. :D
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: nautica on July 07, 2012, 01:22:55 PM score. narrowing it down. :D ??? ???Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: k0mpresd on July 07, 2012, 01:35:13 PM bueller?
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: BDK on July 08, 2012, 08:03:36 AM The ground is added by splicing in to pin 33 and/or 36 at the ecm, connect one or both of these to chassis ground. It is easiest to splice in a few inches back in the harness. Leave both sides of the existing wire intact and connected. These are the internal ecm grounds for the potentiometers for the accelerator pedal (g79 and g185) not the throttle body. On the car I had I could ground either pin or both and both potentiometers would work. I had a a4 jetta and used the ground in the plenum by the ecm. I'm not recommending this as a long term fix but it does seem to work. I don't know what side effects you may have but on a short test drive I didnt have any. You could alternatively add the ground anywhere in the circuit, or at the throttle pedal itself.
I found the ecm that I have that was damaged like this. I opened it and it is clearly burnt at the 30345 chip which I guess may be the wideband controller (according to one of your posts). The ecm is #06a906032LQ. Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: nautica on July 08, 2012, 03:46:40 PM The ground is added by splicing in to pin 33 and/or 36 at the ecm, connect one or both of these to chassis ground. It is easiest to splice in a few inches back in the harness. Leave both sides of the existing wire intact and connected. These are the internal ecm grounds for the potentiometers for the accelerator pedal (g79 and g185) not the throttle body. On the car I had I could ground either pin or both and both potentiometers would work. I had a a4 jetta and used the ground in the plenum by the ecm. I'm not recommending this as a long term fix but it does seem to work. I don't know what side effects you may have but on a short test drive I didnt have any. You could alternatively add the ground anywhere in the circuit, or at the throttle pedal itself. I found the ecm that I have that was damaged like this. I opened it and it is clearly burnt at the 30345 chip which I guess may be the wideband controller (according to one of your posts). The ecm is #06a906032LQ. It's the same thing that I showed on the photo, 32 pin it's a free ground pin. Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: vwaudiguy on July 09, 2012, 11:52:49 PM I once had an ecu that surely seemed to have hardware faults (pedal potentiometer or throttle body I dont remember)..I was able to "repair" this by in fact flashing the ecu over with the same software it already had. I was shocked to say the least..It is worth a try. I am not saying this will work in most cases obviously, but I think It's worth a try!
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: slklite on October 01, 2015, 04:58:14 AM Hello guys, sorry to bring back this old thread, but did someone actualy find a way to fix this without any side effects ? I have a ibiza cupra ecu to repair with this problem. It is a rare ecu and is a pain to find, and most of the time, it is very expensive ...
Thanks ;) Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: Placebo on July 29, 2016, 01:52:51 PM Playing with an ECU that can't do a throttle body adaptation.
How hard is it to remove the circuit board from the metal case to inspect/see the circuit board backside? Tried push n pulling to break the glue but seems stuck in the case pretty good and can't tell how the ECU pin-out connector is held in the case. Maybe need more brute force to break the glue? Let me know if you know. Thx Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: gman86 on July 29, 2016, 04:18:54 PM Playing with an ECU that can't do a throttle body adaptation. How hard is it to remove the circuit board from the metal case to inspect/see the circuit board backside? Tried push n pulling to break the glue but seems stuck in the case pretty good and can't tell how the ECU pin-out connector is held in the case. Maybe need more brute force to break the glue? Let me know if you know. Thx Plenty of heat round the sides (from the back) and pry with something flat but wide. a 2" wallpaper scraper is perfect for lifting boards off. Just make sure you get the scraper under the board or you'll ping up and shave a zillion surface mount devices off the board (don't ask me how I know). Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: Placebo on July 29, 2016, 04:26:21 PM Thanks for the how to. This is already broken but hopefully I can get it free w/o more damage.
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: pycmsp on August 05, 2016, 01:20:36 PM most of the time we replace the ecu when the 02 sensor wires get damaged, love to see how you guys repair them
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: 10101011 on August 10, 2016, 01:54:33 PM Great info ;)
Title: Re: me7 ecu's with no throttle response after o2 wires shorting, how to fix? Post by: aef on March 19, 2021, 12:50:55 AM hi,
the yellow errors are the 5 errors to expect when checking on the bench. all other errors are ontop of that. the wiring of the engine is bad and killed two ecus of the owner. problem not found by now. does someone know which IC is killed here to produce theses errors? speculation right now: must have samething todo with the 5v output because sensors are affected? Think i'm going to measure the 5v on the 30343 when ecu is powered up. related topics: http://nefariousmotorsports.com/forum/index.php?topic=9500.15 http://nefariousmotorsports.com/forum/index.php?topic=65.0 |