Xoutpost.com - Need an expert / wizard to help solve empty fuel gauge issue !!!!!!!

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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)

andrewwynn

10-26-2020 06:14 PM

Oops off by one so pin 12 is 2nd in 9 5th in. Hope you can see a pin one mark because I'm not sure the orientation.

Dinan4.6is

11-23-2020 03:02 PM

So I realized it couldn’t be an issue with the IKE, as I swapped in other 4.6 clusters and they all had the same issue where everything worked except the fuel gauge.
However, thanks to the help I received in this thread, I was able to pinpoint the exact wires responsible for the fuel level sender 1 (12 &7 ). I removed the blue cap off the connector that plugs into the back of the cluster and IKE and removed both 12 & 7. I inspected them closely, cleaned everything, and put them back.
Walla, fuel gauge works.
What a trip.

andrewwynn

11-23-2020 03:08 PM

Dirty or misaigned connector.

Do the test 21 reset so the averaging won't throw off your reading and big congrats!

wpoll

11-23-2020 03:41 PM

Quote:

Originally Posted by Dinan4.6is (Post 1195192)

... I removed the blue cap off the connector that plugs into the back of the cluster and IKE and removed both 12 & 7. I inspected them closely, cleaned everything, and put them back.
Walla, fuel gauge works.
What a trip.

Voilà! indeed.... Great work tracking that down - well done. ;)

andrewwynn

11-23-2020 03:50 PM

Quote:

Originally Posted by andrewwynn (Post 1179365)

the thin wires from the right sender are the level sender. The left side only has two wires.

You need to measure the Ω from both of those they range from close to zero (empty) to about 450 Ω when full.

If those don't register than of course the car can't tell how much fuel you have.

If the sending units are sweeping though the range then you need to look for a broken or shorted wire between the dash and fuel senders

Pull the access panel and meausre the right side sending unit Ω. Then meausre the Ω of each of the connector side to a ground and to each other. I do not know what the normal readings are but as I have my wife's fuel pump in my basement at the moment it won't be difficult for me to go find out.

Post #3. "broken" (disconnected wire) at the plug going into the dash. Did you take a picture so others can check that first in the future ?

Dinan4.6is

11-23-2020 04:13 PM

Unfortunately I only thought of taking the photos after I had already put the cluster back in, and honestly I was too nervous to take it back out and unplug it again, etc.
However, I can say that the numbers designating each pin are clearly visible on the plastic connectors and their caps, making troubleshooting much easier if you know what you’re looking for.
I want to thank everyone for their continued support and help, @andrewwynn your knowledge is very impressive and much appreciated!

Unfortunately I’m still not 100% sure what the exact problem was, but it must’ve been some kind of loose connection with the actual individual 12 & 7 wires. No clue how that could have happened either, I’m just glad it’s sorted.

andrewwynn

11-23-2020 06:18 PM

Well you’re figuring it out will for sure help someone else in the future. The pin number is far More important than the photo

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