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-   -   Need an expert / wizard to help solve empty fuel gauge issue !!!!!!! (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/111644-need-expert-wizard-help-solve-empty-fuel-gauge-issue.html)

Clavurion 10-26-2020 01:55 PM

1 Attachment(s)
Fuel level sensors are just simple potentiometers. Instrument cluster provides supply voltage and then compares the signal according to sensor resistance.

andrewwynn 10-26-2020 02:10 PM

Check pin 12 and 7 if you have voltage on both the problem is internal IKE. If no voltage on just one it's external wiring.

Dinan4.6is 10-26-2020 04:34 PM

Ok thanks guy.
I’m pretty good with my hands and have done a lot of the mechanical servicing myself, but I have no clue how to test resistance.
Anyway,
Once I test the ohms for the right level sender what is my next option, assuming it is or isn’t sending signal?

andrewwynn 10-26-2020 04:51 PM

I would :

1) measure Ω at the sending unit. Both old and new. Confirm it reads not open circuit.
2) measure voltage on the pins at the sender unit connector (each pin to ground).
3) measure pin 7,12 at IKE (I'm not sure if that is actually the dash cluster or a separate module). You can also meausure Ω from 7, 12 to the two pins at the sender unit to confirm continuity.

Need the feedback from above to know the next step.

Dinan4.6is 10-26-2020 04:57 PM

Quote:

Originally Posted by andrewwynn (Post 1193807)
I would :

1) measure Ω at the sending unit. Both old and new. Confirm it reads not open circuit.
2) measure voltage on the pins at the sender unit connector (each pin to ground).
3) measure pin 7,12 at IKE (I'm not sure if that is actually the dash cluster or a separate module). You can also meausure Ω from 7, 12 to the two pins at the sender unit to confirm continuity.

Need the feedback from above to know the next step.

Thanks!
I’m having a hard time understanding how/where to set the multimeter and put the actual probes, etc. I have basically no knowledge of electronics.
I will pass your post onto a tech however ASAP.

andrewwynn 10-26-2020 04:59 PM

YouTube videos will teach the basics of DMM use. Avoid using amp connection and settings and you won't break anything testing. (eg if you accidentally try to measure Ω vs V, it wll just read wrong not break anything).

Dinan4.6is 10-26-2020 05:00 PM

Can anyone can help with the actual location of pin’s 7 & 12, and the actual IKE unit itself?

andrewwynn 10-26-2020 05:32 PM

Need an expert / wizard to help solve empty fuel gauge issue !!!!!!!
 
A Quick search returned IKE is the instrument panel. Now just need to figure out the connector and pinout.

You can use pins like sewing use to read a voltage using a "back feed" method, poke the needle in along with the wire going into the connector


X10114 is the connector it goes above 23 so it's probably the biggest connector on the instrument panel.

andrewwynn 10-26-2020 05:44 PM

https://uploads.tapatalk-cdn.com/202...65bbd76dde.jpg

Should be this blue connector. I can't see pin one mark but if you locate a "1" somewhere you start counting at that pin and count over. 12 will be the same row oppose side. 9 the 4th from that end.

Clavurion 10-26-2020 06:12 PM

Quote:

Originally Posted by andrewwynn (Post 1193815)
https://uploads.tapatalk-cdn.com/202...65bbd76dde.jpg

Should be this blue connector. I can't see pin one mark but if you locate a "1" somewhere you start counting at that pin and count over. 12 will be the same row oppose side. 9 the 4th from that end.

That should be the one.

https://www.pss-autosoft.net/diagram...3_EX10114A.htm

It's a 26 pin connector.

https://www.pss-autosoft.net/diagram...s/B260005C.png

Also wire colours should reveal.

Pin 7 black/red/white (sensor 1 supply)
Pin 12 brown/black/white (sensor 1 measuring side)

Pin 23 black/red/yellow (sensor 2 supply)
Pin 16 brown/black/yellow (sensor 2 measuring side)


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