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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 02-16-2011, 02:44 PM   #21
CrunkBMW
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Logan 4549
I never got it figured out. Each time my fuel gauge reaches empty because reservoir one is depleted, reservoir two never engages my fuel gauge. could be an issue with the instrument cluster. I also notice that in order for my fuel gauge to read correctly even from reservoir one, i must reset my cluster after every fill up. even then, i only get readings from reservoir one. so i am still where i started.
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Old 02-16-2011, 05:19 PM   #22
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It's the same issue that I'm having. I took out both sending units today and checked them with the OHMS meter, and they both register correctly. I think I'm just going to take it into a shop to have them figure it out.
I'm lost for ideas. How many miles do you get per tank? I only get about 280mi
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Old 02-17-2011, 03:47 PM   #23
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if you do take it to the shop, please let me know what they discover, so that i can use that to help figure out what i might need to do. I get about 420 miles per tank currently. sometimes less, depending on how i drive.
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Old 02-18-2011, 08:34 AM   #24
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I think I need to replace my O2 sensors... The most I've ever gotten is 310 mi
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Old 02-18-2011, 02:10 PM   #25
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I have seen it mentioned on this forum on several electrical issues that if you disconnect your battery for 30 mins the problem goes away. Could be worthwhile to try before you replace a cluster.
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Old 02-18-2011, 11:16 PM   #26
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Originally Posted by TitanSilverE46 View Post
I have seen it mentioned on this forum on several electrical issues that if you disconnect your battery for 30 mins the problem goes away. Could be worthwhile to try before you replace a cluster.
I've done that before. If the cluster is the issue, would the needle move on the cluster test (test 2)? My needle works fine during the test. Also, my option 6 test now shows values, where before it just showed zeros??
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Old 02-18-2011, 11:26 PM   #27
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My values are 141000_ _6.0; _ _142_ _6.1; _ _145 2_6.2
What does that mean?
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Old 02-19-2011, 05:30 AM   #28
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141000 means your left tank is recording 14.1 litres while your right tank is showing zero litres.

Now the left normally keeps the right topped up until tank gets down to less than 30 litres. Usually the left drops while the right is still at 33.0 litres.

I bet your tank is 3/4 full and should be showing 141330 or a total of 47.1 litres. So it still looks like the fuel pump sender (located on the right side) is either not working or its signal is not getting to the cluster, or the cluster is not recognising the signal.
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Old 02-19-2011, 10:03 AM   #29
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Thank you
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Old 02-19-2011, 07:08 PM   #30
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I wondered whether it might have been possible to swap the leads to the left and right fuel level senders (leaving the pump leads alone of course). Just pulled out my rear seat and the leads do not have visible plugs without delving further in. Just thought if it was possible to swap the leads, the result might have been interesting. If you got 330000 then the fuel sensor is OK and the problem is in the wiring between the tank and cluster or in the cluster itself. If you got 000141 then the wiring and cluster are OK and the right side sender unit is faulty.

Just thoughts on isolating the problem.

I have just bought the set of BMW TIS DVDs and coming to grips with reading the wiring diagrams. I was hopeful of finding what colours the sender wiring might be. No luck so far.
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Old 02-21-2011, 12:39 AM   #31
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I wouldn't even be able to begin to understand how to reverse the leads...... :o
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Old 02-21-2011, 07:33 AM   #32
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Check the wiring to the left hand fuel level sensor - maybe a bad ground?

http://www.bmw-planet.com/diagrams/r.../e46/index.htm
Section - Body /Displays and Information / Pointer Instruments / Fuel Gauge

Fuel gauge

The tank content is measured with two lever sensors which are separately linked to the instrument cluster. Each lever sensor is connected with a separate ground (analog ground) and a sensor line (analog positive) to the instrument cluster. The different methods of determining the fuel level for each tank half is adapted by means of the coding data. The gauge shows a percentage of the total contents of both tank halves.
Fuel reserve warning lamp

There is no reserve contact in the level sending unit to activate the fuel reserve warning lamp. The fuel reserve warning lamp is switched on dependent on the tank contents in comparison with a reserve threshold value. The fuel tank content is made available in the form of a telegram on the CAN bus to serve as information for engine control. The fuel reserve warning lamp switches on as a function check when terminal 15 (pre-drive check) is switched on.

If the instrument cluster detects a fault in the power circuit of one or both lever-type sensors, control of the fuel gauge is continued with the aid of the consumption signal. After stopping the vehicle and then switching on the ignition again, the fuel gauge is set to empty and the fuel reserve warning lamp switched on if a fault is still detected in the power circuit of one or both lever-type sensors.


http://www.bmw-planet.com/diagrams/r...000007267.svgz
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Last edited by shanneba; 02-21-2011 at 07:38 AM.
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Old 02-21-2011, 08:52 AM   #33
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Thank you Shanneba
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Old 05-26-2011, 10:59 PM   #34
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I have the exact same issue.... Anyone ever solve it?
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Old 06-02-2011, 01:36 PM   #35
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Bump!
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Old 06-02-2011, 02:11 PM   #36
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I have the exact same issue.... Anyone ever solve it?
I have a similar issue as well. I replaced both my fuel sending unit/pump (right side) and the fuel level sensor (left side) with brand new oem parts. My fuel indicator in the cluster began gives false readings. After double checking my work and speaking with BMW master tech. We determined the instrument cluster itself needed to be reflashed and updated. I still haven't paid to have it done yet. But he did say it would fix it.
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Old 06-08-2011, 07:43 AM   #37
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Originally Posted by zuckuss00 View Post
I have a similar issue as well. I replaced both my fuel sending unit/pump (right side) and the fuel level sensor (left side) with brand new oem parts. My fuel indicator in the cluster began gives false readings. After double checking my work and speaking with BMW master tech. We determined the instrument cluster itself needed to be reflashed and updated. I still haven't paid to have it done yet. But he did say it would fix it.
Is reflashing the instrument cluster the same as resetting it under the hidden menu # 21.0? If so i've done that to no resolve.
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