hello
i need some help for correct wiring of the trigger sensors on m50b25 with vanos.
the stock ecu is siemens ms40.1..crank and cam sensor have 4 wires 1 is the shield..the colors is black ,yellow and brown.which one is the signal ground and what power is needed?from what i found the crank is vr and cam hall it can be true this??
thanks a lot
The factory wiring diagram for these is a little confusing.
These are the relevant diagrams, it does say cam is hall and crank is vr.
ok i understand where i’m wrong.the vr sensor is 5v??12v is the hall
thanks i give a try
VR sensors are normally 2 wire and have no power supply as they generate their own voltage. Hall sensors are notmally12v.
Then why 3 wires?so is hall sensor,i don’t get it..
I know, makes no sense, but that is the actual BMW factory wiring diagram.
These are the diagrams for the Bosch ECU. These would make more sense. H is a 12v feed by the way.
I don’t know what the story is with the sensors for the Siemens control unit as i’ve never had anything to do with them. (may not have been an option in my country). The Bosch ECU sensors are definitely hall and VR. Might be easier to get new sensors.
A quick search shows you’re not the first to have issues with siemens sensors. I would swap them for later hall sensors in both.
somewhere i read it that…i try to connect like hall and i see