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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 05-01-2013, 02:10 PM   #1
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Join Date: May 2013
Location: Sacramento, Ca USA
Posts: 2
My Ride: 2000 323 Ci
E 46 DME Power Issue

First post, glad to be here!

I've got a 2000 323 Coupe that will not start, cranks fine.

Issue seems to be no/insufficient power to the DME.

Operation was fine until leaving the grocery store the other day, car started fine and ran 20 seconds or so before stalling. Restarted right away and continued to sputter and stall. Symptom appeared to be due to low/no fuel pressure, verified by testing fuel pressure at the fuel rail.

Tested through the fuel pump electrical system, relay is fine, fuse 54 is fine. No power at the fuel pump connector, no fuel pump power at the fuse block.

Symptoms leading to the DME malfunction appear to be:

The engine ran until fuel pressure diminished completely.

Peake Research diagnostic tool R5/FCX tool gives the 'Flashing E' error message, indicating that one of the diagnostic busses is inoperative and the tool cannot communicate with the DME.

Dashboard temp gauge defaults to full-hot when the key is turned to position 2, which I've read elsewhere indicates that a DME bus is offline, citing that the temp gauge gets it's signal from the DME, but defaults to full-hot when there is no signal.

Thinking this is a failed DME relay or failed DME.

One last pertinent bit of info at the time of the malfunction. I'd just started the car, and hit the switches for both front windows and power sunroof so all three were operating at the same time. Is it possible that the amount of power being drawn could have overloaded a relay/circuit/bus in an aging E 46 that would cause these specific electrical failures?

First step from here is to test the voltage across the DME relay, but any advice would be extremely helpful!
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Old 05-01-2013, 03:02 PM   #2
Registered User
Join Date: Aug 2012
Location: Clemson, SC
Posts: 1,448
My Ride: 2001 BMW 325i ZSP
fuel pump. change it.
scarede46er is offline   Reply With Quote

dme, dme power, dme relay, e 46

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