OK, that's Step 1 and it proves the sensor has the correct power.Disconnected harness. Powered up and checked yellow wire to ground. 7.99volts.
As you discovered that’s not the case. The nominal 8v is generated inside the ECM and has a dedicated return/ground wire back to the ECM rather to the machine frame ground. This is also where your spoons prove to be very useful.I made an assumption it wanted to check 8vdc to ground.
I'll send you an electrical schematic that in addition to the wiring also has machine locations on it.As I move to the next step how do I locate/ isolate the plugs at the ECM?