# Bosch ABS sensor

**URL:** <https://community.ecumaster.com/t/bosch-abs-sensor/4074>\
**Category:** EMU PRO\
**Created:** [July 16, 2025, 8:27pm UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074 "2025-07-16T20:27:29Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Adrian](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/adrian/32/706_2.png) [@Adrian](https://community.ecumaster.com/u/Adrian)\
**Post date:** [July 16, 2025, 8:27pm UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074/1 "2025-07-16T20:27:29Z")

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Hi there! Been trying to work out how to use bosch abs M5 sensors to use directly as speed sensors, I belive the pinout should be just digital signal/digital gnd but i cant get any reading at all.

Tried using a m18 sensor and it gets frequency, and it wont change with polarity it seems.  
Its configured as VR sensor (tried Hall aswell) and no pullup (tried 1k pulldown just incase)

Thanks in advance!

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**Author:** ![Greg](https://avatars.discourse-cdn.com/v4/letter/g/71c47a/32.png) [@Greg](https://community.ecumaster.com/u/Greg)\
**Post date:** [July 17, 2025, 7:40am UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074/2 "2025-07-17T07:40:01Z")

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they are MR sensors nor VR, you need 12V and a signal with a pulldown.

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**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\
**Post date:** [July 17, 2025, 12:14pm UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074/3 "2025-07-17T12:14:34Z")

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Like Greg said, they are called MR or 2-wire Hall sensors.

Check out the manual for the [WheelSpeedToCAN module](https://www.ecumaster.com/files/devices/wheelSpeed/wheelSpeedManual.pdf).  
Everything about those sensors is described in there.

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<div class="post-metadata">

**Author:** ![Adrian](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/adrian/32/706_2.png) [@Adrian](https://community.ecumaster.com/u/Adrian)\
**Post date:** [July 17, 2025, 2:30pm UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074/4 "2025-07-17T14:30:39Z")

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Thanks, will try it wired like that. 🙂

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**Author:** ![JeanD](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@JeanD](https://community.ecumaster.com/u/JeanD)\
**Post date:** [August 7, 2025, 8:08am UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074/5 "2025-08-07T08:08:32Z")

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Hi all

I am curently trying to connect MR ABS sensors on Pro-8

Is this scheme correct ?

In the software there is only VR and Hall …. I suppose that I have to select VR , and to set threshold to a value between 1.5 and 3.1 Volt ?

Do I have to set a Pulldown 1K ?

Thanks for your advice 🙂

 ![MR connection](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/7/702cc1c590ecc4f9a3c68b0bd2020387d481f804.jpeg)

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<div class="post-metadata">

**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\
**Post date:** [August 7, 2025, 10:16am UTC](https://community.ecumaster.com/t/bosch-abs-sensor/4074/6 "2025-08-07T10:16:41Z")

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Hi,

The diagram is correct.  
Remember that MR sensors have polarity and will only work if connected the right way.

You can select Hall in the settings.  
It will set the voltage threshold to 2.5 V.  
Pull resistor has to be set to none.