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BMW ECU you unplugged and rain has got an on top of the plug holes
03-13-2020, 05:14 PM
Post: #1
Ford BMW ECU you unplugged and rain has got an on top of the plug holes
Hi there I've been working on a BMW and the person who worked on it before me left the ECU and plugged and rain has got all in the top of the plug holes for just wondering if it will be any good if I dry it out if anyone's ever done it before thank you very much

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03-14-2020, 12:07 AM
Post: #2
RE: BMW ECU you unplugged and rain has got an on top of the plug holes
By the chance, it's depending how much time did the rain was in top of your ECU and harness connectors.
Best way to approach this is that (as always water go inside any ECU) before any power running, open the ECU and:

1. Make first a visual inspection inside and to the connector pins. Take special attention to the encapsulated unsealed components (like reels). Make a visual inspection of the harness connector pins too.
2. If everything is ok then start to make measurements of pinouts. Each pin must have a good connection with the solder trace inside the ECU. For this installation step, is better to have a spare connector harness with a few cms of wires (from a junkyard). Do this verification 2 or 3 times by removing and reinserting the plug connectors between checking measurement steps.
3. If after the visual inspection, there is water inside and (worst) there is salt inside, then you must clean as much as you can. Do this first washing with distilled water. Then start rinse using a weak acid - like acetic (can use vinegar). After cleaning, rinse with distilled water again and finally rinse with propilic alcohol. The alcohol will help remove the water from all components and the drain process. Use a soft brush with long hair, trough all steps. After removing the water inside, put your ECU inside an oven and cook it for 2 hours at 110-120 degrees C. Better to use an electric oven with ventilation and don't go over 125 degrees.
4. Check the harness connector and go through the same steps. Because of course, you can't cook the harness, leave it to dry for few days (or hours ) or use a hairdryer.
4 bis. (you can skip this step if you don't know hot to or you can't do it) On the bench, put power on + on ECU pins (according to the pinouts info) and test the checkpoints for the correct tensions. If you dont have this service info you can check the tension on the ICs pins.
5. Make a backup of the ECU using JTag or BDM techniques and save the files for further usage. Don't forget to backup the EEprom.
6. Disconnect the car battery. Don't put the cover on ECU. Connect the ECU on the car and power it (connect the harnesses). Connect the battery. Before inserting the key, check ECU if some components are going to hot.
7. If everything is ok, try to start the car.

You are free to comply with these or to skip any step. It's up to you, but to maximize your chances is better to go through.

PS. If you believe in any God, don't forget to make a pray before work started.

Goodluck!
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 Thanks given by: Mark1495
03-14-2020, 04:30 AM
Post: #3
RE: BMW ECU you unplugged and rain has got an on top of the plug holes
(03-14-2020 12:07 AM)UnQ Wrote:  By the chance, it's depending how much time did the rain was in top of your ECU and harness connectors.
Best way to approach this is that (as always water go inside any ECU) before any power running, open the ECU and:

1. Make first a visual inspection inside and to the connector pins. Take special attention to the encapsulated unsealed components (like reels). Make a visual inspection of the harness connector pins too.
2. If everything is ok then start to make measurements of pinouts. Each pin must have a good connection with the solder trace inside the ECU. For this installation step, is better to have a spare connector harness with a few cms of wires (from a junkyard). Do this verification 2 or 3 times by removing and reinserting the plug connectors between checking measurement steps.
3. If after the visual inspection, there is water inside and (worst) there is salt inside, then you must clean as much as you can. Do this first washing with distilled water. Then start rinse using a weak acid - like acetic (can use vinegar). After cleaning, rinse with distilled water again and finally rinse with propilic alcohol. The alcohol will help remove the water from all components and the drain process. Use a soft brush with long hair, trough all steps. After removing the water inside, put your ECU inside an oven and cook it for 2 hours at 110-120 degrees C. Better to use an electric oven with ventilation and don't go over 125 degrees.
4. Check the harness connector and go through the same steps. Because of course, you can't cook the harness, leave it to dry for few days (or hours ) or use a hairdryer.
4 bis. (you can skip this step if you don't know hot to or you can't do it) On the bench, put power on + on ECU pins (according to the pinouts info) and test the checkpoints for the correct tensions. If you dont have this service info you can check the tension on the ICs pins.
5. Make a backup of the ECU using JTag or BDM techniques and save the files for further usage. Don't forget to backup the EEprom.
6. Disconnect the car battery. Don't put the cover on ECU. Connect the ECU on the car and power it (connect the harnesses). Connect the battery. Before inserting the key, check ECU if some components are going to hot.
7. If everything is ok, try to start the car.

You are free to comply with these or to skip any step. It's up to you, but to maximize your chances is better to go through.

PS. If you believe in any God, don't forget to make a pray before work started.

Goodluck!
Around about 4 months ago

Mark1495, proud to be a member of GarageForum since Mar 2020.
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03-14-2020, 05:53 AM
Post: #4
RE: BMW ECU you unplugged and rain has got an on top of the plug holes
Was this car with the "battery on" all this time? and didn't understood very well: was the ECU plugged or unplugged?

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03-17-2020, 02:42 PM
Post: #5
RE: BMW ECU you unplugged and rain has got an on top of the plug holes
Just finished it off today and it's running lovely the ECU was ok after all that thank you for replying

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03-17-2020, 03:01 PM
Post: #6
RE: BMW ECU you unplugged and rain has got an on top of the plug holes
After years of repairs and lot of different projects, I always love the feeling of having a hard project with a happy end.
I'm happy for your success.

Best regards,
UnQ

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04-13-2020, 02:17 PM
Post: #7
RE: BMW ECU you unplugged and rain has got an on top of the plug holes
Just a quick update run sweet as a nut soon as I plugged the ECU back in after cleaning with no problem thank you to all members who commented

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