HELP Fuel Pump Relay EKP/Engine Wiring Schematic

[sapote]

As for the voltage being 0 with the relay disconnected, the DME was definitely not seeing a proper ground to send signal voltage

I don't think the DME needs to see any ground or signal from the EKP in order to send out pwm signal on its pin11. Here you can confirm this, measure at relay pin1 or DME pin11 whichever easy for you:
1) key turned on and during pump priming, I think the signal is 0V (active low signal would be 0v to run the pump)
2) after 20sec priming, DME turns off the pump by sending out the signal with 5v (or 12v whatever it is) to the EKP to turn off the pump. This inverted signal logic we called it Active Low logic.

Now, if what you will find out is opposite of what I just say, means active high logic, then the only way it works like this is the DME pin11 is an Open Collector with pull-up in the EKP circuit.

I thought all DMEs are the same for M or non-M but different firmware, so they should be not expensive to find on ebay.

[y2k_o__o]

Sorry to bring this back

I lost that ground wire bolt, does anyone know the part number?

It seems to be a M8 bolt

[t3ddftw]

..

[George Hill]

Its M8x1.25mm but I can't recall the length, short, something like 12mm IIRC.

I can pull one of out an engine in a bit and double check the length.

[y2k_o__o]

Its M8x1.25mm but I can't recall the length, short, something like 12mm IIRC.

I can pull one of out an engine in a bit and double check the length.

Thanks !
I tried with the heatshield bolt (M8 x 14), i couldn't turn all the way in with a few threads remaining, so yes it is definitely shorter (may be M8x10 or M8x12 ??)
did yours come with washer attached as well ?

can you also take a picture of it?
The closest i find is a M8X12 crankcase pulley bolt (07119900271), but not sure if the shank length is too long for the grounding terminal ring.

[George Hill]

The closest i find is a M8X12 crankcase pulley bolt (07119900271), but not sure if the shank length is too long for the grounding terminal ring.

I think that one would be fine.

I pulled a bolt out of a clients car, but it looked long. It works properly and measured 14mm length measure from under the washer.

I then pulled one out of my car and it measured 12mm length from under the washer.