07 Prius won't run ABS pump

Replaced with OEM or a used one? I read that the used one's randomly get this issue. Any way to scan and post codes?

 

You're replacing just the pump here are you replacing the ABS actuator assembly? There's no reason the car won't run the pump check and see if the pump connections are getting power just because I imagine when you if you're changing just the pump I mean the minute you assemble the pump and plug it up it's going to come on because there's no pressure it's going to try and satisfy the accumulator pump up the system as it needs to be but if it can't stay that way pumped up in pressurized usually it's not the pump that's causing it to not be able to stay pressurized it's the pressure vessel is compromised which is the round black thing next to the pump but what do I know or there's an internal leak inside of that big aluminum block that the lines connect to usually it is referred to as internal not like something leaking at a wheel cylinder or a caliper so if you're just replacing the pump you may be I'm not moving very much forward I guess I would say hard to say because I'm not sure what you've done usually when you replace this assembly it's the actuator you say pump so you're replacing just the silver thing on the big aluminum silver block that the brake lines connect to but not the black round diameter?

 

So then I guess internally that ABS actuator assembly that you've installed is not sensing its pressure wild I've never heard of such a thing but I guess anything is possible or that's what it would seem unless there's an external something that's reading that pressure and then sending signals back to the break actuator I guess that's possible I have to go dig in the manual and see what it says and you have no break codes?

 

I know it might be tough maybe you can do it with the heat gun or something is the pump getting excessively hot when it's running you know an electric motor pump etc if it gets right warm it might not come on until it cools off again of course why it's getting warm is an issue obviously and then this could be internal and it could take quite a while for you to be able to notice it on your temperature gun or with your fingers just seems odd you can put power to it and it comes on fine and pumps up well as far as we know or until it shuts off and then you apply the brakes a few times and it won't pump back up yeah that's very interesting that would seemingly be something to do with that big plug on top of the unit and the internals of the actuator it would seem like to me I've had a few bad actuators but not a problem where the pump won't come on usually the pump will run into Oblivion

 

Aren't there two relays under the hood somewhere which are needed for the pump to run? Maybe one of them failed. If they were pulled out at any time when the ABS unit was replaced perhaps one wasn't put back in the right slot?

 

Yes the two blue ones one at the top and one at the bottom of the box they're clearly marked under the hood of the box and they do need to come out from bleeding I wonder if one failed or they're not even put back that would be weird but I guess it's pumping up sometimes oh when they put direct voltage to the pump or something I'm not sure what they're doing.