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Old 09-03-2023, 12:28 PM
Join Date: Apr 2022
Location: SF Bay Area CA
Posts: 6
fixingstill is on a distinguished road
2010 X5 E70 with N52 engine. Fuel Pump relay does not get ground signal to activate.

2010 X5 3.0si E70 with N52 engine. Production date 11/2009. Last 7 digits of VIN is L279494. No EKPS fuel pump module because it is not a direct fuel injection. DME controls fuel relay directly. Problem is crank no start. I found out there was no fuel pressure. When I jump the pin 8 and 2 (the thick wires) of the relay connector (relay removed), engine runs (and fuel pressure 70 psi). Also, when I give ground to pin 4 of the relay (not removed), engine runs so it is not the relay. There is no code at all for DME module either. Relay is supposed to get a ground signal from DME X60005 pin 12 (via connector X6011) to the white/blue wire at the relay connector K6301. It does not (and I understand it would do so for 2 sec when ignition is on, or door is open, then off until engine is cranking or crank position sensor valid signal is read.)

My case is very similar to "Cranks, but doesn't Start. Th FP Relay has 12V" in Bimmerfest and user dihoriul ended up replacing his DME.
The whit/blue wire is at 4.0V AT ALL TIMES (relay removed) which accordingly to post #45, it is normal:
"When a transistor floats, the voltage a multimeter sees can be quite variable, depends on the internal impedance of the meter. Seeing 4.4V isn't indicative of anything. Important thing is that is isn't 0.00 aka ground."

I also checked pin 12 (white blue wire) at connector X6011, it still gives 4.0V:

I could only imagine DME is just not sending a ground signal to its pin 12 at X60005 to activate the fuel relay. Why?
The car came to me with a water damaged DME. I bought one of the same PN (7602220 MSV80.0) on ebay and sent the DMEs, CAS, and key out to have it cloned. The cloned DME gave me this problem and I bought yet another DME and did the same and end result is still the same.

Is this a common problem? dihoriul, where did u end up trashing your defective DME or you sold it away? And I am at the receiving end? And, even a 2nd one is doing the same? Am I too cheap to always pick the cheapest one on ebay?

Or the cloning procedure was not done right? Something to do with CAS, ISN, Vehicle Order or something disabling the fuel? Or the water-damaged DME might not even be the right one to begin with? Maybe it was from a X5 with N54 direct-fuel-injection engine that uses EKPS and no fuel relay to control? But the VIN is matching. Someone updated the VIN without reprogramming (recoding / reflashing / whatever) the DME for this car?

Try a third one or get a new virgin one from BMW (Nope, it is $2k)? Or get a set of DME, CAS, Key and to program it to the car (so that ISN matches the tranny module and allow me to drive? I have autel maxisys pro but never tried programming a new DME.

I spent 2 months working on this. I am at my wit's end. Help please.
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Old 09-04-2023, 01:46 AM
ard ard is offline
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 6,744
ard is on a distinguished road
FWIW... isnt the anti-theft feature whereby the DME will not activate the fuel pump if it detects a bad EWS handshake? I think you allude to this above.

Interesting walk through...might be useful

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