05-11-2020, 11:33 AM | #1 |
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BMW Leak Detection Module Line Break
Hey guys, I'm stumped on my F30. I had the stealership replace the DMTL pump because it is covered under emissions warranty and everything was OK for a week and then the check engine light came back on the other day. I then had bmw check it again...here is the video that the dealership sent me.
The technician indicates that there is a short circuit in the wire and that it would require 2-3 more hours of diagnosis. Anyone know what I can do from here with this bullshit emissions?maybe a bypass? I can't fathom taking apart my whole car to find a possible grounded wire. Thanks guys. Last edited by ivstealth; 05-11-2020 at 11:42 AM.. |
05-11-2020, 02:06 PM | #2 |
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I'd be surprised it if it's a grounded wire. Did the dealership perform a pressure test of the gas cap to make sure it is properly sealing? Was your in-tank fuel pump replaced recently? If so, did they replace the gasket? Any other work performed on the car where they may have potentially disconnected something related to the evap system?
Last edited by IraHayes; 05-11-2020 at 02:26 PM.. |
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05-11-2020, 02:08 PM | #3 |
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It has resistance on the wire that connect to the ECU. Somewhere between the back right of my car and front left where my ECU is, there is a bad connection. Lol. What a POS
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05-11-2020, 03:28 PM | #4 |
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Has he checked the fuses? If the fuse checks out, is it the correct amperage for the circuit? If it's a 10 amp circuit and someone wrongfully installed a 5 amp fuse I can see this potentially causing an issue. In theory the lighter duty fuse should blow, but if it isn't, I can see this causing issues. Also, maybe pull the fuse and look at the contacts inside the fuse box to make sure there isn't some kind of foreign metal object in there.
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05-11-2020, 03:48 PM | #5 | |
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05-11-2020, 06:01 PM | #6 |
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Ah, I see. Hopefully the issue is at or near one of the connectors then; easier repair that way. It will suck if you have to start taking a lot of stuff apart to find it.
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05-11-2020, 06:08 PM | #7 |
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The only plan I have right now is to locate a wiring diagram and splice from the start of the harness to the fuel tank. Lol
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05-12-2020, 01:09 AM | #8 |
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Maybe I'm off my rocker here but if you replace something and then a week later an issue appears and is traced back to the same general area, then wouldn't it make sense that you'd carefully inspect your work and the work area to make sure the prior job didn't cause the issue? Seems pretty obvious to me that the prior repair and current issue are related.
I would bet the short is in the first 1 foot of wire at the back of the car, not the DME side. Electrical wiring issues like this just don't suddenly appear after years unless someone or something damaged the wires or harness. Last edited by XutvJet; 05-12-2020 at 01:15 AM.. |
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05-12-2020, 09:17 AM | #9 | |
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07-14-2020, 01:20 AM | #10 |
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Throwing a bump out there. Wondering if I can use ignore this issue or it's something that I need to Tap I to the nest of wires by the ecu and run it all the way there.
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08-21-2020, 03:59 PM | #11 |
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The DMTL doesn't really do anything useful. It's not even used on cars outside of the US, Canada and South Korea. It should be possible to code it to not active, I've even come across a place in Eastern Europe that will do that, but I haven't been able to find out how to do it with Bimmercode or E-SYS. A fault in it doesn't even show up in the car self-diagnostics or most OBD diagnostic tools. Anything of a critical nature is going to fire up more than just the CEL, so I'd put a piece of electrical tape over the lamp on the dash and forget about it.
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08-21-2020, 04:03 PM | #12 | |
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I even checked the connecting wire as I was told by my buddy who works with bmws that they do go loose, but not in my case. |
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08-21-2020, 04:31 PM | #13 |
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There has to be an E-SYS cafd to enable or disable it, that's the only way BMW could have it functional in the US and Canada but not in Europe. I went through all the listed expert mode entries in Bimmercode, including those in the tank section, but DMTL doesn't show up anywhere. I don't have E-SYS any more, but if you've got nothing better to do one day you may find DMTL cafd in there.
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03-20-2022, 09:13 PM | #14 | |
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03-20-2022, 09:18 PM | #15 | |
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03-20-2022, 09:32 PM | #16 | |
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Thanks |
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03-20-2022, 09:42 PM | #17 |
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I know they look for o2 readiness but I don’t know if they can detect a coded out check engine light. I haven’t gotten an inspection at all.
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03-20-2022, 11:00 PM | #18 |
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Of course after making my comments mine tossed codes and lit the dash light. In my case it turned out that a mouse had chewed the wires. I wasn't easy to trace, I had to pull the right rear wheel well liner, where I discovered the broken wires and Mickey's nest. I still think there should be a way to code it out, since they don't use it in Europe, but have no idea how.
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04-26-2022, 01:53 PM | #20 | |
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04-26-2022, 02:53 PM | #21 | |
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Break was in area circled red and you could barely see it. The wire is very thin. Hope this helps. |
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04-29-2022, 02:12 PM | #22 | |
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Appreciate the quick feedback. |
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