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19th November 2018, 10:22 | #1 |
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Drowned ECU's
Any of you knowledge able types know why ECU's are not waterproof/proofed? Not my problem but my baby brothers- he is a MB owner and his German machine has just broken down on a journey in France and the MB agents have diagnosed a drowned ECU. Sorry if its a silly question but seems common sense?? Chris S.
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19th November 2018, 11:08 | #2 |
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exrover75 saloon owner gone to a good home Join Date: Aug 2011
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saves a few pennies on each car.. or when the car is new they don't let water in but as they get older gaps occur, pipes block and you get leaks.
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19th November 2018, 11:27 | #3 |
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The 1.8 and V6 models of our cars do have a sealed ECU, unfortunately the Diesel ECU'S have an atmospheric pressure sensor inside them so they're not sealed.
Due to the poor design of the location of the wiring that goes into the bottom of the plastic box the diesel ECU fits into it allows water to enter it and the ECU. This can also affect the Glow plug relay that's also contained in the same box. Not sure about the Mercedes ECU's and their location though as I don't really get to work on them, but it may be similar. Russ
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19th November 2018, 11:34 | #4 |
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exrover75 saloon owner gone to a good home Join Date: Aug 2011
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my sons merc had it under a cover in the passenger side footwell so electrical gremlins aplenty..
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19th November 2018, 12:03 | #5 | |
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Quote:
Didn't know before the rationale for not having a sealed ECU on the diesel. It is a garbage reason - You could still have it sealed and still sense atmospheric pressure - the case only needs a tiny bit of ability flex (well technically - change volume by an extremely small amount).
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19th November 2018, 12:57 | #6 | |
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Quote:
The thing is on other vehicle applications that use the same ECU they don't need to be sealed as they're in a location that doesn't get wet (unless the car gets totally submerged)
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19th November 2018, 13:00 | #7 |
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My old BMW 320D had a drowned ecu it was a 2007 model. It was goosed and even marinabrian condemned it!
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19th November 2018, 13:05 | #8 |
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Of course you know why they didn't go for that option, more expensive.
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19th November 2018, 15:51 | #9 | |
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Quote:
And so high up you would have abandoned ship long before the water started lapping against it. |
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19th November 2018, 16:35 | #10 |
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Hmm.....Yeah it is in a stupid place 😒 but is it not possible to reposition elsewhere on the car or is it far to much hassle?.
Ste |
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