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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #76  
Old 01-17-2015, 11:18 AM
lpcapital lpcapital is online now
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Quote:
Originally Posted by PIXLFIX View Post
Interesting that one if the outlets doesn't have any hose on. Just a lot of crystallized urea.
Attachment 487085
I'm just taking taking a guess here since I've not seen that unit in person, but the outlet may be #5 at page 144 of this paper: https://drive.google.com/file/d/0B1e...ew?usp=sharing

It's labeled "operating vent" and has to do with the urea heating system.
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  #77  
Old 01-17-2015, 01:02 PM
PIXLFIX PIXLFIX is online now
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Ok, disassembled the old tank.
Unfortunately the crystallization theory is wrong. Didn't find any crystallization inside the tank.
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And this is the culprit. Visually nothing wrong with it.
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  #78  
Old 01-17-2015, 01:23 PM
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However...... May be this is what's causing the issue. Barely visible residuals on the contacts.
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  #79  
Old 01-17-2015, 01:39 PM
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Probably not though.
There is a base contact (nr1) and 3 other contacts. On the good sensor there should be the resistance between nr 1 and other pins (2,3 or4) 10kOhm (when the tank is empty). And yes, my new tank have this resistance.
On my old tank there is no contact at all on this connector - infinite resistance.
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  #80  
Old 01-17-2015, 01:41 PM
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So is it the reference pin damaged?
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  #81  
Old 01-17-2015, 02:09 PM
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No, the pins are fine. Just no resistance.

In overall:

There are 4 metal contacts on the sensor. Connected to the corresponding contacts in the connector. There is a 0ohm connection between the metal contact on the sensor and contact in the connector. Which is good.
Per Rheingold there should be 10kOhm between the first contact and any of the other contacts. Old sensor doesn't have this resistance for some reason. May be there is some kind of circuit inside the sensor (not visible) which is not working properly.

Interesting, that this sensor is being advertized as non replaceable, but it's definitely is.
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  #82  
Old 01-17-2015, 04:06 PM
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Interesting! The 10kOhm is likely how the sensor is diagnosed.

If 10k Ohm is measured then the pin is not covered by Urea, if the circuit is open then the sensor is damaged. When the sensor is covered by Urea the resistance is very low.

If that's the case than the sensor may be fixed by adding a 10k Ohm resistor from Radio Shack between the base pin and all others.

If my theory is right, try submerge the sensor is urea, expose the different prongs and measure resistance. If you get a low value than the sensor itself works...
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  #83  
Old 01-17-2015, 05:40 PM
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Quote:
Originally Posted by lpcapital View Post
Interesting! The 10kOhm is likely how the sensor is diagnosed.

If 10k Ohm is measured then the pin is not covered by Urea, if the circuit is open then the sensor is damaged. When the sensor is covered by Urea the resistance is very low.

If that's the case than the sensor may be fixed by adding a 10k Ohm resistor from Radio Shack between the base pin and all others.

If my theory is right, try submerge the sensor is urea, expose the different prongs and measure resistance. If you get a low value than the sensor itself works...
Sure thing. Because all those metal contacts on the sensor are hardwired to the pins.

And of course if you measure the resistance between 2 and 3 or 2 and 4 or 3 and 4 you are getting around 19-20kOhms.

I'm just curious, what may happen to all those resistors inside the sensor. Were the fluid get inside and they've corroded or something?

This sensor on the pictures above is also the temperature sensor. So in overall there are 6 wires are coming out from it. 4 for the level sensor and 2 for the temperature sensor.
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Last edited by PIXLFIX; 01-17-2015 at 05:50 PM.
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  #84  
Old 01-18-2015, 11:38 AM
ninja_zx11 ninja_zx11 is offline
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So have you finished putting back the new part?did it resolve the check engine light issue?
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  #85  
Old 01-18-2015, 01:19 PM
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I believe I'll will go with the old part just adding the dummy circuit shown above. I'm pretty sure it will solve the problem. After the success confirmation I'll put the new tank for sale ))
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  #86  
Old 01-18-2015, 03:21 PM
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Work in progress
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  #87  
Old 01-18-2015, 04:05 PM
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Done ))
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  #88  
Old 01-18-2015, 06:30 PM
ard ard is offline
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I was going to say, the color code wasnt maintained...glad you shrink wrapped that!
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  #89  
Old 01-18-2015, 07:07 PM
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X5 35d CEL P205b

I wasn't concerned about color coding, because those white connectors are fail-safe and it is impossible to plug in this dummy-insert in any other position than correct one (vise versa or upside down).

Test driving right now. No any issues yet.

Last edited by PIXLFIX; 01-18-2015 at 07:08 PM.
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  #90  
Old 01-18-2015, 08:39 PM
ninja_zx11 ninja_zx11 is offline
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  #91  
Old 01-18-2015, 09:28 PM
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I'm still trying to figure out how come it helped last time to rinse the tank with the water? There wasn't absolutely no any crystallization inside the tank. The only idea coming is that I was using the warm/hot water which made a temperature shock to the sensor restoring the failing contact inside. Can't figure out anything else.
Now, I'll drive ~200-300 miles and if everything will be fine - I'll put the new tank for sale.
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  #92  
Old 01-18-2015, 10:54 PM
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Nice job!!!!
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  #93  
Old 01-18-2015, 11:28 PM
henrycyao henrycyao is offline
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I understand the sensor is not important. This looks more like by passing the sensor rather than fixing it? A true fix would require testing the near empty condition and see if you trip the sensor. Am I wrong?
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  #94  
Old 01-19-2015, 05:46 AM
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All sensing data is still working fine. It wasn't passing "self-check" only. Now it's does.

Last edited by PIXLFIX; 01-19-2015 at 08:11 AM.
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  #95  
Old 01-19-2015, 09:14 AM
smyles smyles is offline
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Is there any identification on the sensor itself, to search/source it?
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  #96  
Old 01-19-2015, 09:47 AM
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Quote:
Originally Posted by smyles View Post
Is there any identification on the sensor itself, to search/source it?
There is completely nothing. Just half distorted looking kinda QR code.
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  #97  
Old 01-19-2015, 12:55 PM
ard ard is offline
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A few comments:

the color code thing was a joke.

the actual sensor may be buried.

I have no idea what kind of sensor BMW uses...

http://www.meas-spec.com/downloads/S...ty_Sensors.pdf
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Alignment here: The Definitive Alignment Thread

OE is Original Equipment aka 'BMW Original Parts' aka 'What you buy at the BMW dealer with a BMW label'

OEM is Original Equipment Manufacturer... EITHER the company that made the OE part or.... A part this is identical to the OE part, but is sold by the OEM under their own label


OEM is not what BMW sells


http://www.bimmerzone.com/category/T...ricks_OEM.html

https://www.turnermotorsport.com/t-OEvsOEM
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  #98  
Old 01-19-2015, 01:13 PM
PIXLFIX PIXLFIX is online now
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The temperature sensor is buried (it's located inside the level sensor). Level sensor contacts are exposed as it is visible from the pictures. The only thing which is buried for the level sensor is self-check circuit.
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  #99  
Old 01-19-2015, 08:00 PM
lpcapital lpcapital is online now
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You did a terrific job with this project!!! Thanks very much.

I'll add this to our DIY section for future reference.
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  #100  
Old 01-19-2015, 08:23 PM
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Sounds good. I'll provide with the progress if there will be any other issues.
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