HELP Fuel Pump Relay EKP/Engine Wiring Schematic

[gheorghe]

Hello all,
I am looking for some help.
Long story short, I just finished with my valve adjustment on my 06, put everything together and went for a quick drive in my neighborhood. Car started fine, idled very smooth and ran nice for about a block from my house when I started hearing a buzzing sound from under the hood around 2250-2500RPM. I came to a stop and took off again trying to listen for that sound when the car died. Opened the hood and smelled a burning smell, it was dark but I saw that I forgot to bolt down the ground on the passenger side of the head (Pic below of ground I missed). I think I fried the throttle actuator but I haven't dug into it yet.

My question is, does anyone have or know where I can find the engine wiring diagram for the S54?
Anyone have any suggestions/ideas what could have burned up by not having this ground attached?

Any help would be greatly appreciated.

PROBLEM FIXED: the EKP went bad by not connecting the ground I had missed

[sapote]

I think that ground cable is for the ignition coil: grounding end of the coil's secondary coil. With a loose connection, it is harder to discharge the spark at the plugs, and this might cause the spark to discharge within the coil packs. I hope this didn't cause damage to the DME coil driver FETs (high voltage high current transistors). Check if it still have sparks when cranked.

[sapote]

" I saw that I forgot to bolt down the ground on the passenger side of the head "
This loose end of the cable would act like a spark plug and it was discharging sparks to any metal nearby, or any sensitive electronics and zap them. Luckily there is nothing sensitive nearby except the exhaust cam sensor.

[sapote]

In the old days with conventional coil, this end of the secondary coil was connected to the coil 12v terminal internally, but modern car coil packs have this end connected to the head for a good reason, but not this case, sorry.

[gheorghe]

Thank you for the Info. It would make sense the end of the ground loop sparking against the nearby head/exhaust as it may have been the source of the buzzing I was hearing under the hood.
I will dig into it today and see what I can find. I also hope I did not damage the DME.

[gheorghe]

I had a few minutes to check today, I can see the throttle linkage is moving when the key is on and attempting to crank so that should be good.
I am also getting spark when I crank the engine but it will not start. I scanned it for codes with my generic scanner quickly and saw multiple misfires codes pending but none were current. I'll check to see if I'm getting fuel next.
Any other suggestions would be welcome.

[sapote]

I'll check to see if I'm getting fuel next.
.

How to find out?
Hear the fuel pump prime? Key turned on, one pin of the injector should be 12v, and the other pin should be switching between 12v and 0v alternately when cranking.

[gheorghe]

I've narrowed the issue down to fuel.
My fuel pump is not priming but it will turn on if I direct jump it. I can actually start the engine and run it with the fuel pump directly jumped. This tells me the injectors and ignition coils are ok.
I'm now on the search to see why the fuel pump is not turning on by itself.
- I checked fuse 54 - good
- checked the green fuel pump relay- good
- I don't know how to check the EKP Relay though, but I will back probe to see if it is getting power
- I also checked all the fuses in the black box under the DME cover and all 5 are good
I'm still wondering if the DME is sending a signal to turn these components on but I couldn't find the pinout chart to see which pins send power to the EKP.

[Lukem3]

https://drive.google.com/folderview?id=15y6e1W8jFe4cX5vFQJW45sf3pc43K4jN

Wiring diagram of dme along with fuel sender to the cluster. Goodluck friend

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[gheorghe]

https://drive.google.com/folderview?...W45sf3pc43K4jN
Wiring diagram of dme along with fuel sender to the cluster. Goodluck friend

Sent from my SM-G996U1 using Tapatalk

Thank you sir!!! Very much appreciated!

[sapote]

See this thread that we discussed about the US fuel pump relay to help you trouble shoot it:

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/92305-power-to-fuel-pump-but-no-prime-any-help-please/page2

[Pnick]

DME Connector X60002 PIN 11.

[Lukem3]

DME Connector X60002 PIN 11.

That would be for an earlier build car, 2006 is showing pin 10

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[gheorghe]

Thank you for the great info guys! I have it narrowed down to the EKP.

EKP Pinout results:
Pin 1: DME signal from X60002 PIN 11 - I have 0.5V with key ON
Pin 2: Signal to fuel pump I get nothing - should be ~12V
Pin 6: I get the correct 12V battery voltage
Pin 7: Ground
Pin 8: I have 12V with key on

I know the pump works if I jump it and since I am not getting anything out of Pin2 I am lead to believe the EKP is bad. I did take the black cover off the EKP thought and I didn't see anything burned or dark inside. The capacitor is also not bloated or showing signs of damage. I may have damaged one of the microchips inside running the car without the ground???

I'll see if my local BMW dealer has one in stock, fingers crossed.

[Lukem3]

Thank you for the great info guys! I have it narrowed down to the EKP.

EKP Pinout results:
Pin 1: DME signal from X60002 PIN 11 - I have 0.5V with key ON
Pin 2: Signal to fuel pump I get nothing - should be ~12V
Pin 6: I get the correct 12V battery voltage
Pin 7: Ground
Pin 8: I have 12V with key on

I know the pump works if I jump it and since I am not getting anything out of Pin2 I am lead to believe the EKP is bad. I did take the black cover off the EKP thought and I didn't see anything burned or dark inside. The capacitor is also not bloated or showing signs of damage. I may have damaged one of the microchips inside running the car without the ground???

I'll see if my local BMW dealer has one in stock, fingers crossed.

Dme signal voltage should be around 5v. If you're getting 0.5 volts you either have a burnt wire or a burnt dme, the relay won't actuate and send power to pin 2 without the confirmation from the dme with 5v

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