Electric Power Steering Pump - 1967 Barracuda

For my high pressure side I used a fitting like this one with an o-ring seal. Not sure if your pump is different. I remember a few years ago when researching this there was a youtube video of someone with the back of the unit off, and they broadcasting CAN messages to it (assuming it was vehicle speed) and it would spin up and down. I don't know how far people got, and if they published that info (and it's probably year / make / model model dependent) but if it was published I'd have no trouble making a little open source board that took various inputs such as VR sensors from wheel speed, dizzys, throttle position, whatever and send out data over CAN.

As far opening one up, maybe, I suspect it's conformal coated so that could be a pain. Some BLDC's motor systems have a separate motor drive circuit but most that are tightly integrated (low cost, mass produced) that have a micro (in this case to do the CAN bus stuff) will also use it to do the motor commutation. A BLDC setup will typically be be running in a torque control mode with a speed control loop adjusting the torque to regulate speed. If it does have a standalone commutation logic section or dedicated chip for this, it's typically a PWM or analog signal that will be used to very the motor current, and you wont be able to just command a speed. If someone really wanted to work towards this they are welcome to send me pictures, maybe a new firmware could be made and loaded.