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Old 03-06-2021, 12:10 PM
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Petrol Fuel Pump Controller Diagnosis

Had another thread where I was concerned I had a fuel filter issue, with the fuel pump being replaced 2.5 years ago, due to intermittent no start issues. Turns out, as I'm sure many of you already know, fuel pump issues are common issue with this model.

Fast forward, I just replaced the fuel pump on my wife's e70 maybe a month ago and she just experienced another no start issue. Tried 3 times to start but to no avail. The 4th attempt it finally started.

This happened with 1/4 tank. I thought maybe then it was the siphon jet in the fuel tank that maybe failed. I gathered fuel system data via the hidden OBC menu before fill up and after. All numbers look good:


Hidden menu 06.00
1/4 tank:

Tank L R S Stats = 2.6 20.6 23
Tank Ohm- L R = 893.6 391.6

Full tank:


Tank L R S Stats = 41.9 37.5 79
Tank Ohm- L R = 085.1 100.9


I had already replaced the fuel pump relay in the earlier thread.

I believe what I am left with is diagnosing the fuel pump ECU.

Has anyone gathered data/tested the fuel pump ECU using ISTA/D or INPA and can share your steps/experience?

I can't seem to locate any mention of diagnosing the petrol fuel pump ECU on xoutpost. Only discussion I can find is diesel models.

I searched and was able to locate this page that walks through testing but they aren't using ISTA/D or INPA. I checked every controller in ISTA/D last night and couldn't find any place to obtain info on the fuel pump controller.
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Last edited by absolutezero273c; 03-06-2021 at 12:36 PM.
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  #2  
Old 03-07-2021, 09:35 AM
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If you have a fuel pump relay you don't have a fuel pump controller (EKP).
There should be a wiring schematic on the relay.
1) Remove relay. With ignition on, confirm you have 12v at relay pin 30 in socket.
2) Remove relay and insert a fused jumper wire between relay socket pins 30 and 87. Fuel pump should run.
3) With jumper in place and fuel pump running, try to start engine.
4) If fuel pump doesn't run with fused jumper in place, you have a wiring, power or fuel pump problem.
5) If engine doesn't start with FP running check pressure at rail. If pressure is OK, you have something other than a fuel issue.

This may not be a fuel problem. If DME doesn't sense cranking RPM, it won't energize the fuel pump relay and FP won't run.

https://uploads.bmw2002faq.com/month...a59afa0757.jpg
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Old 03-07-2021, 12:48 PM
ard ard is offline
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Quote:
Originally Posted by pshovest View Post
This may not be a fuel problem. If DME doesn't sense cranking RPM, it won't energize the fuel pump relay and FP won't run.
Which is why a bad crank position sensor or misinstalled sensor prevents starting?
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Old 03-08-2021, 11:06 PM
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pshovest/ard, good points. Odd thing is no codes to point me anywhere.


I do have to say though, that when I go in to check codes there are certain random modules that appear to have issues(red) and I have to reset them(green) using ISTA/D.


Both alternator and battery have been replaced over the past 6 months. I mention that as I would attribute freak incidents like this to fluctuating or low voltage.


Would a similar K-CAN issue cause this type of thing? No codes, no dash lights either.
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