S54 EMU Black PNP adapter ground connection confusion

Hello,

I am building a PnP adapter for BmW s54 engine with EMU Black. Have been studying the original wiring diagrams and have many questions regarding several sensor grounds

The problem:

It seems the Knock sensors have the sensor ground AND wire shield both grounded to the same pin. Although strange I guess it would not be a big issue all by itself. The issue is that the same pin is also used by these components:

Cranshaft position sensor shielding (VR sensor, sensor ground separate from shielding)

2x Camshaft sensors ground (Hall type, power by 12v but return a 5v signal, no shield)

Coolant temperature sensor ground

The Different components all connected to the same location seem to have conflicting usages, and I am not sure where to route the pin.

Looking for help whether the pin should wired to Power Ground or Sensor Ground, any help is appreciated.

Modyfing the original harness is not an option unfortunately.

If there is only one shared sensor ground / shield -- I would connect that to sensor ground. If there is a separate shield, I would connect that to chassis ground as a start, but might test moving it to power-supply gound or sensor ground if there was an issue.

What happened when you tried it? How much noise do you measure on the sensor ground with the engine running? If you are developing products, this is the type of engineering analysis you need to do.

Generally, if the engineers at BMW felt it was OK to ties signal ground and shield together, it's probably OK for that engine.

Currently still in planning stages, so no testing of engine noise. I was hoping to figure out the questionable place before assembling a harness.

Attaching the wiring diagrams showing the issue. Multiple items all connected to the same X60003-25 pin

So, since you are making a plug&play harness (adapter to an aftermarket ECU), you connect x60003 pin25 to the a chassis / battery ground. That is where they have connected shields and the Coolant Temp sensor ground. And you connect X60003 Pin 21 to a Signal Ground.

Or are you making a new engine harness, and are concerned about the splicing of into a single pin? This is very common for grounds and supply voltages.

I really don't see why you think there is any issue at all.

I am making a pnp adapter for the OEM harness.

One more wiring diagram I previously failed to attach that changes things imo.

The knock ground and shield are also connected to the same X60003-25 pin. Which creates some confusion for me. If it were only the earlier 3 a chassis ground would make sense, but now I'm not so sure

How is that confusing? You only have to connect pin25 to a ground! Don't overthink this...