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BMW 3-Series (E90 E92) Forum
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DME failure :(
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11-19-2012, 08:23 PM | #23 |
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Well picked up my car in ATL Saturday and brought her back to Knoxville. I shipped the DME off to have it rebuilt by autoecu. 5yr warranty on it.
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11-19-2012, 08:39 PM | #24 | |
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It is typical to use a board pre-heater to help warm the board up before applying the heat directly to the part to melt the solder, specifically with large parts like high power surface mount MOSFETs Hot air guns are also common in surface mount soldering. These are not the same as the ones you buy at the hardware store to strip paint. The temperature is precisely regulated and the air flow volume is considerably less than paint stripping models. Considering the high price associated with replacing the DME, ensure you know what you are doing before you attempt to replace parts on the DME PCB. I'm not trying to pick a fight, but I have a good bit of experience in this area, and I know just how much of a pain it can be. Without the right equipment and experience, you can have a costly mistake on you hands. However, using care and the right tools, surface mount soldering high power packages by hand is doable. |
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11-20-2012, 08:17 AM | #25 | |
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Other option is to buy a new DME and have it recoded, pay hundreds to fix it.
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E90 LCI N54 6AT
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11-20-2012, 08:19 AM | #26 | |
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11-20-2012, 10:23 AM | #27 | |
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I just don't want someone without the proper experience, etc. to read this and think because they tackled the JB4 resistor mod, they can open up their DME and start changing FETs. |
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11-20-2012, 10:34 AM | #28 |
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The injector MOSFETs on this board are not very difficult to solder..I did it and replaced two on my board with no problems and it took me no longer than 30 min..it took me longer to determine which ones were bad. If you have ever soldered on an RC car or the like then you can handle it. Plus if your thinking about buying a new DME then you have nothing to lose by trying this first. I was lucky and fixed mine for free by bumming parts out of another members failed DME.
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11-23-2012, 08:53 PM | #29 | |
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Not a bad idea for someone who can't stomach a DIY repair.
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E90 LCI N54 6AT
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12-01-2012, 09:55 PM | #30 | |
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12-01-2012, 10:08 PM | #31 |
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Not worth it. They told me they didn't find anything wrong with it. I was hoping for a 5yr warranty, but I'm just gonna repair it myself now.
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12-02-2012, 06:47 PM | #32 |
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If you repair it yourself, make sure you get some extra parts thats needed because you can make a nice chump change repairing members on this forum...I would gladly pay you 200 bucks to get it repaired if mine was fried...
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12-03-2012, 10:47 PM | #33 |
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Tested the mosfets today. Injector #3 mosfet was bad on mine. I don't know how autoecu couldn't figure that out. Tomorrow install a new one and hope for the best.
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12-05-2012, 08:16 AM | #35 |
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Good luck R45.
I don't have good news for me. I'm not sure if I can blame autoecu or not. But a friend of mine came in and we took Injector #3 mosfet off and solder in a new one. Put my DME back in the car and it is not communicating to the car at all. I'm 99% positive what we did, is not causing the communication issue. If we did do anything wrong bank 1 would still be down, not a power/communication issue. I'm not sure what autoecu did they just told me they didn't find anything and put some grease around the edges of the board. But when I pulled the car onto the lift and pulled the DME out it was getting communication to the car. We tested everything and determined the DME relay was not waking up. Even when we forced it to the car was still not communicating to the DME. Luckily we had a 07 335i in the shop for service so I swapped DMEs to see if it would communicate and sure enough it did. So I called the dealer and ordered a reman DME last night. I get a call this morning and was told BMW does NOT REMAN 07 DMEs. New ones are only available.
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Last edited by 4DRSpeed; 12-05-2012 at 08:41 AM.. |
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12-05-2012, 06:05 PM | #36 |
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Replaced both of mine, the ecu error is gone, now I am getting 2e31 error (injection valve cylinder 1 input signal). I pulled all the connectors from injector 2 and blew them out, error still occurring. Not sure if that means its a bad injector as the connections seem fine.
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12-07-2012, 02:04 PM | #37 |
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Got my car back up and running, it was a bad connection on the harness that was causing the 2e31 error. My repair of the ECU was successful, both Ignition 1 and 2 MOSFETS had to be replaced.
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12-07-2012, 03:41 PM | #39 | |
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12-07-2012, 06:10 PM | #40 |
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Around $1,000 with labor.
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12-07-2012, 06:12 PM | #41 |
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Will you offer a service to repair the dme since you already have experience with it. I would gladly pay for your services if mine ever goes bad!
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12-07-2012, 07:19 PM | #42 |
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My only fear is if someone sends one in, I replace the MOSFETs and it does not resolve their issue. I would have to offer the service with no guarantee that it would resolve their issue, I can only guarantee that the faulty MOSFETS are replaced.
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12-07-2012, 07:41 PM | #43 | |
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