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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 02-18-2012, 09:27 AM   #1 (permalink)
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Arc weilding damaged ECU?

I have a 1995 318ti. I had mufler work done and as they welded a pipe, they grounded the Arc Welder to a oxgen senser. When the welding was done, the car would turn over but not start.
I belive the ECU may have been damaged. Does anyone have any advice or experince with this.
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Old 02-18-2012, 10:00 AM   #2 (permalink)
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Arc welding any vehicle without taking precautions to protect the electrical system is asking for trouble. Us E36's have an inbuilt diagnostic routine which you can access by following this procedure Pelican Technical Article: Reading BMW Fuel Injection Fault Codes other than that, you need to check all the fuses, then try and pull the diagnostic fault codes using sofware like INPA, DIS or even Carsoft. You will find more info on diagnostics here Diagnostic Software - Bimmerforums - The Ultimate BMW Forum .
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Old 02-18-2012, 10:17 AM   #3 (permalink)
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I have a OBD11 but ofcourse the 1995 car does not use this system. thanks for the links, i will do some research on those sites.
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Old 02-18-2012, 11:03 AM   #4 (permalink)
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I have tried to run a code check on my car and the Check engine light flashes but does not show any codes. Is it possible i am not activating the system properly or is the ECU fried and not allowing the codes to show up?
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Old 02-18-2012, 08:36 PM   #5 (permalink)
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If the DME is damaged it certainly will not return any diagnostic codes, but other things like blown fuses, damaged DME relay etc. will also prevent trouble codes from being generated.
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Old 02-18-2012, 09:34 PM   #6 (permalink)
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i will check all fuses in the morning and will post results.
Thanks for the tips David
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Old 02-18-2012, 09:39 PM   #7 (permalink)
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Whenever you are doing any weilding on a car you should disconnect the battery to isolate the electrical system. The shop doing the work should have known this, and their insurance should cover their lack of precaution. Connecting the wielders ground to an electrical component is just asking for trouble, they should have used part of the exhaust mounting or piping as a ground.
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Old 02-18-2012, 09:57 PM   #8 (permalink)
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yeah yeah i'm hip...i'm hip..they used the exhaust system right where the O2 sensor is. The shop was a friend of mine......no recourse. My mistake. Very simple weld which two shops didnt want to do and one quoted $1200 to replace all parts. the weld worked out great....but electical problems may cost more.
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Old 03-22-2012, 10:30 PM   #9 (permalink)
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Hi,I had just bought a auto diagnostic tool---BMW Multi Tool V2.3 for my car,It is can read and write code,key programmer ect,may be you can get one to read the fault code to see if it is ECU damage,and you can got ECU there either.Good Luck...The shop web is xcardiag.com.
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Old 03-22-2012, 11:20 PM   #10 (permalink)
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Originally Posted by smonz2d View Post
Hi,I had just bought a auto diagnostic tool---BMW Multi Tool V2.3 for my car,It is can read and write code,key programmer ect,may be you can get one to read the fault code to see if it is ECU damage,and you can got ECU there either.Good Luck...The shop web is xcardiag.com.
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