# H-Bridge setup for Haldex gen 5 direct pump control? **URL:** \ **Category:** EMU PRO\ **Tags:** how-to\ **Created:** [September 1, 2025, 7:03am UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342 "2025-09-01T07:03:16Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![solo](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@solo](https://community.ecumaster.com/u/solo)\ **Post date:** [September 1, 2025, 7:03am UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/1 "2025-09-01T07:03:16Z")
I have an Ecumaster Pro8 I am planning to use it to directly control the gen 5 Haldex pump which is a PWM controlled pump. In the diff control strategy I see that only H-bridge 1234B can be selected for PWM control. 1.Does it mean that it can only GND control the haldex pump and I need to wire it to switched 12V and PWM control it with Gnd ? 2. I found on various resources that the Haldex gen5 pump can draws up to 15 Amps of current where the H-Bridge current limit is 7.5 A. Is it possible to use 2 synced H-Bridge outputs like 3B and 4B in order to bypass the current limitation? I did not find such an option in tha latest 222 experimental software version for EMU Pro for Diff Control. PS: Ecumaster tech support couldn’t assist with any suggestion. ---
**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:** [September 1, 2025, 4:42pm UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/2 "2025-09-01T16:42:24Z")
> [@solo](#): > > 1.Does it mean that it can only GND control the haldex pump and I need to wire it to switched 12V and PWM control it with Gnd ? No. Every h-bridge output can be switched to ground or supply. The limitation is that only one output per H-bridge can have active PWM. > [@solo](#): > > 1. I found on various resources that the Haldex gen5 pump can draws up to 15 Amps of current where the H-Bridge current limit is 7.5 A. > > Is it possible to use 2 synced H-Bridge outputs like 3B and 4B in order to bypass the current limitation? I did not find such an option in tha latest 222 experimental software version for EMU Pro for Diff Control. It’s not possible to sync single outputs in H-bridges. You can only sync full bridges with each other. The only solution to this is by using the “Custom DC motor” strategy. In that strategy, you have to assign a full bridge, which means both outputs A and B will be assigned. Now, depending on the direction, output A is grounded, and output B has a positive PWM, or vice versa. The output with PWM can be used to control the haldex, and the second will stay unused. The con of that solution is that one h-bridge output goes to waste (can’t be used for anything). With that strategy, you can also use synced bridges, so you could double up the outputs and get a higher maximum current. But you need two full bridges for that, so now two outputs are wasted. ---
**Author:** ![solo](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@solo](https://community.ecumaster.com/u/solo)\ **Post date:** [September 1, 2025, 6:07pm UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/3 "2025-09-01T18:07:57Z")
Thanks for detailed reply. Assuming I have 2 full H-Bridge free. Is there any chance that in a future release you could enable hbridge sync for diff control strategy? Could you please consider it? ---
**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:** [September 4, 2025, 10:29am UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/4 "2025-09-04T10:29:26Z")
> [@solo](#): > > Is there any chance that in a future release you could enable hbridge sync for diff control strategy? But what is your actual issue now? 1. You don’t have two free H-bridges and want to use combined single outputs (ex., 2B & 3B)? or 1. Do you want to use a differential strategy instead of a custom DC with two full H-bridges in sync? ---
**Author:** ![solo](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@solo](https://community.ecumaster.com/u/solo)\ **Post date:** [September 4, 2025, 11:40am UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/5 "2025-09-04T11:40:16Z")
1. I would like to use the Differential stragey with two full H-Bridgees in sync without using the Custom DC in order to have all the other parameters that are there in the DIfferential control besinde the DC value. ---
**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:** [September 4, 2025, 11:58am UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/6 "2025-09-04T11:58:10Z")
That seems like a good feature that we should be able to add. The problem is, I can’t give you any timeline for that, because we have a lot of high-priority tasks. I think it should be possible to achieve the same functionality in the custom DC motor strategy. You can add 4th dimension to the DC table, and use the Z slices as tables for acceleration, braking, handbrake, or launch control. You need to create a new channel in the project tree that combines those states and use it as the Z axis in the DC table. ---
**Author:** ![solo](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@solo](https://community.ecumaster.com/u/solo)\ **Post date:** [September 4, 2025, 12:46pm UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/7 "2025-09-04T12:46:19Z")
Yes, would be great to have it i Differential Control. I agree that it is possible to use with custom DC output but not so easy, think its better to have it in the strategy itself. @mkuklis_ECUMASTER btw is there any defect for the Custom DC motor menu, I don’t see the option to select sync output in version 222.0 ![Screenshot 2025-09-04 at 16.15.38](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/4/45423d6c096028cf9bf1d6be7cedadd580e8c959.jpeg) ---
**Author:** ![HWS](https://avatars.discourse-cdn.com/v4/letter/h/858c86/32.png) [@HWS](https://community.ecumaster.com/u/HWS)\ **Post date:** [September 23, 2025, 12:44pm UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/8 "2025-09-23T12:44:52Z")
Did you get this to work? ---
**Author:** ![solo](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@solo](https://community.ecumaster.com/u/solo)\ **Post date:** [September 23, 2025, 2:23pm UTC](https://community.ecumaster.com/t/h-bridge-setup-for-haldex-gen-5-direct-pump-control/4342/9 "2025-09-23T14:23:39Z")
For the time being I wired a solid state relay in order to use the Differential control strategy. Did not test the pump control yet, car is still in progress.