# Water pump control **URL:** \ **Category:** EMU PRO\ **Created:** [April 26, 2024, 7:41am UTC](https://community.ecumaster.com/t/water-pump-control/1231 "2024-04-26T07:41:43Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Rossco](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/rossco/32/899_2.png) [@Rossco](https://community.ecumaster.com/u/Rossco)\ **Post date:** [April 26, 2024, 7:41am UTC](https://community.ecumaster.com/t/water-pump-control/1231/1 "2024-04-26T07:41:43Z")
Hi Guys, Im looking into adding a CWA400 pump into my current setup. has anyone used this with EMU? looking for some help with setup please. Thanks ---
**Author:** ![remus](https://avatars.discourse-cdn.com/v4/letter/r/b2d939/32.png) [@remus](https://community.ecumaster.com/u/remus)\ **Post date:** [May 4, 2024, 5:07pm UTC](https://community.ecumaster.com/t/water-pump-control/1231/2 "2024-05-04T17:07:36Z")
just use a pwm output with dc function based on CLT and RPM I`m using it on black with similar setup. On PRO there is also LIN protocol, I think you could use the newer continental pumps. ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/1X/8671a08af98064ea6ed3531f59f2710399c3fa99.png) ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/1X/d6bb38c10b59556c5943c2e970c80a3f8f1b271f.png) ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/1X/721d2464b8da4f887bc3f2c6aec3a9aadf732e18.png) ---
**Author:** ![ScottSmith](https://avatars.discourse-cdn.com/v4/letter/s/cc9497/32.png) [@ScottSmith](https://community.ecumaster.com/u/ScottSmith)\ **Post date:** [May 19, 2025, 2:55am UTC](https://community.ecumaster.com/t/water-pump-control/1231/3 "2025-05-19T02:55:51Z")
FWIW I spent some time getting it working with an EMU PRO-8. Turns out the pull up resistor on the Aux output isn’t strong enough to overcome the pulldown resistor in the pump (at least the one I’m using - from a BMW N20 engine). The square wave signal was only reaching ~6V. When I manually added a stronger pullup resistor I got it to work. If I were to do it again I’d wire it to a half bridge output.