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E28 (1982 - 1988)

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  #51  
Old 11-03-2011, 06:26 PM
mikesalot34 mikesalot34 is offline
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Mein Auto: 535i
It's factory. Was told that this is a big bugger to trace out.

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  #52  
Old 11-03-2011, 07:05 PM
mikesalot34 mikesalot34 is offline
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Well do you have any ideas? I traced all wires for any scrapes. I think that power comes out of the computer through the alarm an does a check. Seems that there is a break in the system check and is shutting the fuel pump down.

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  #53  
Old 11-03-2011, 09:02 PM
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catso catso is offline
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Location: Chicago
 
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Mein Auto: 2000 323i, 1988 528e
Quote:
Originally Posted by mikesalot34 View Post
Well do you have any ideas? I traced all wires for any scrapes. I think that power comes out of the computer through the alarm an does a check. Seems that there is a break in the system check and is shutting the fuel pump down.

Sent from my PC36100 using Bimmer
Why don't you try pulling the fuse(s) for the alarm and see what that does. If there's more than one, try one at a time.
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  #54  
Old 11-27-2011, 06:15 AM
Ataglance Ataglance is offline
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Location: Michigan
 
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Mein Auto: 1988 528
I still don't have this fixed. I have battery voltage at the fuel pump relay at all prongs except 30, which goes to the fuel pump. Voltage is at the ECU pin that connects to the relay.

New ECU and new relays did not fix anything and the pumps can be jumped without the relay.

Does anyone know what it means to have voltage at the ECU pin but no power to the pumps?
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