VR Crank Sensor Question
VR Crank Sensor Question
(OP)
I have a VR type crank sensor and I'm not sure how to wire it to the harness. Its a Bosch sensor typical on Mercedes cars. I assume one side is ground reference from the ECU then the output or signal is wired back to the appropriate input of the ECU. I don't know the polarity of this sensor. How do you determine which wire is the signal out put on a sensor like this? The wires coming from it are one green and one yellow and there appears to also be a single yellow wire (same shade)in the same pigtail that goes to the oil pressure switch If that's any help.





RE: VR Crank Sensor Question
My quick and dirty method when getting my Megasquirt and Ford EDIS based system working working was to try it and see which polarity was giving a cranking signal on the monitoring software. If you have an otherwise working engine you could just try it and see which one starts it.
Cheers
Nick
RE: VR Crank Sensor Question
RE: VR Crank Sensor Question
RE: VR Crank Sensor Question
http://www.megamanual.com/ms2/pickups.htm
RE: VR Crank Sensor Question
Hall effect seems to have fallen out of favor. My guess is that VR is cheaper even with the zero crossing circuit.
Biggest problem with VR sensors seems to be epoxy "creep". Expansion and contraction of the sealing epoxy breaks the fine wires. I have seen it happen in a short as a few dozed thermal cycles on prototypes. Make sure you know what kind of epoxy your vendor is using and that he sticks with it !