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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-30-2015, 08:35 AM
KSUTJH KSUTJH is offline
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Location: Maize, Kansas
 
Join Date: Nov 2012
Posts: 121
Mein Auto: 2000 540
ABS Module and MPG guage

So, I have the trifecta of lights on now, they were intermittent up to this point, but now they are on all the time and the speedo quit as well. Also the mpg guage thing is pegged all the way to the left, is this another indication of a abs module failure? The previous owner put in a rebuilt one from BBA, they dont want to warranty it unless I get the codes read and sent to them. Of course the codes read both front sensors and the drivers rear. I have taken all the sensors out and cleaned them and put them back in, after I did that was when the speedo and mpg stopped working. Are the mpg guages not vacuum actuated any more?
On a related note, the cruise works, but you can feel it surging, not horribly noticeable, but enough that my wife says it makes her wanna get sick.

Last edited by KSUTJH; 04-30-2015 at 08:36 AM.
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  #2  
Old 04-30-2015, 11:15 AM
edjack edjack is offline
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 11,142
Mein Auto: '97 540i 6 speed
Are the mpg guages not vacuum actuated any more? Never were. The readout reflects a measure of injector duty cycle.
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  #3  
Old 04-30-2015, 02:26 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
I typed /mpg gauge in the bestlinks and this came up...
- Is the instrument cluster fuel economy mpg gauge vacuum or electric and how does it work (1)
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Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 04-30-2015, 02:28 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
I'd check the electronics first:
- One user's experience debugging a half-dead instrument cluster (1)

This is the DIY:
- How to test a BMW battery & alternator (1)

Then I'd look at the ABS system:
- Is it possible for diagnostic tools (such as INPA, PASoft, Carsoft, etc.) connected to the OBD/Pacman port to correctly diagnose the ABS BRAKE DSC/ASC trifecta (1) & the many explanations by 540iman as to why the fancy schmancy diagnostic tools almost always fail to properly diagnose the trifecta or bifecta (1) (2) (3) (4) (5) (6) (7) & once you know that information, how to run the canonical quick test of the ABS BRAKE DSC/ASC trifecta or bifecta (1)
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See also: E39 Bestlinks & How to easily find what you need
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