# Sharing crank sensor bmw ms42/black

**URL:** <https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393>\
**Category:** EMU BLACK / CLASSIC\
**Created:** [November 24, 2023, 1:40pm UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393 "2023-11-24T13:40:19Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Psimotor](https://avatars.discourse-cdn.com/v4/letter/p/a9a28c/32.png) [@Psimotor](https://community.ecumaster.com/u/Psimotor)\
**Post date:** [November 24, 2023, 1:40pm UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393/1 "2023-11-24T13:40:19Z")

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I´m trying to use stock ecu Siemens ms42 and black at the same time. Stock hallsensor on crank.  
I have split the signal and the black works fine but the ms42 does not seem to read rpm? I´m using the stock instrument cluster but it shows no rpm when car is running.

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**Author:** ![norbert.parkita](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/norbert.parkita/32/40_2.png) [@norbert.parkita](https://community.ecumaster.com/u/norbert.parkita)\
**Post date:** [November 24, 2023, 3:21pm UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393/2 "2023-11-24T15:21:14Z")

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Hello,

Could you try the settings from the attachment with the filter turned off and a pull-up resistor? If the above procedure doesn’t work, check if the ground point of the Siemens MS42 and EMU BLACK are in the same location. It’s possible that a potential difference is causing incorrect signal decoding in the stock ECU.

![BMW_PTrigger](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/1X/cb01d507084c5b5db75260574a20529cce32173e.png)

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<div class="post-metadata">

**Author:** ![Psimotor](https://avatars.discourse-cdn.com/v4/letter/p/a9a28c/32.png) [@Psimotor](https://community.ecumaster.com/u/Psimotor)\
**Post date:** [November 24, 2023, 4:13pm UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393/3 "2023-11-24T16:13:03Z")

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Tried it and the car starts with pullup off. I will check the grounding.

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**Author:** ![volpe.elaborazione](https://avatars.discourse-cdn.com/v4/letter/v/3da27b/32.png) [@volpe.elaborazione](https://community.ecumaster.com/u/volpe.elaborazione)\
**Post date:** [November 27, 2023, 7:59am UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393/4 "2023-11-27T07:59:42Z")

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the original bmw rpm sensor does not work with ecumaster, it has been replaced with another sensor

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**Author:** ![Jadzwin\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jadzwin_ecumaster/32/28_2.png) [@Jadzwin\_ECUMASTER](https://community.ecumaster.com/u/Jadzwin_ECUMASTER)\
**Post date:** [November 28, 2023, 3:43pm UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393/5 "2023-11-28T15:43:53Z")

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If you see proper signal in EMU you can try to put 10K resistor in series with the signal. Make sure to disable any pullup and filtering in EMU trigger configuration

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<div class="post-metadata">

**Author:** ![Psimotor](https://avatars.discourse-cdn.com/v4/letter/p/a9a28c/32.png) [@Psimotor](https://community.ecumaster.com/u/Psimotor)\
**Post date:** [November 28, 2023, 4:05pm UTC](https://community.ecumaster.com/t/sharing-crank-sensor-bmw-ms42-black/393/6 "2023-11-28T16:05:34Z")

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Will try!.Signal in black is perfect.