Rebuilt HV battery still getting codes c1310, c1259, p3190

First make sure again that the High Voltage battery is at a high state of charge.
Fully charge the high voltage pack first to give you the best chance of success.

At startup, the Prius uses the big battery to spin the electric motor.
The electric motor spins the gas engine .
At this point the gas engine hasn't actually started firing yet . The gas engine isn't truly running yet.
Momentum from the spinning is what makes it seem like it is running.
So if the car "dies" after about 15 or 20 seconds, it is likely because it never really started. The gas engine never really fired up and took over from the spin that the electric motor gave it.

So let's try to determine if there is an issue with the fuel.

How old is the gas that is in the gas tank?
Is the gas in the tank pretty fresh?
As in, less than a month old.
Less than a week would be even better.

Will it stay running if you use starter fluid as a starting aid?
Basically if the car runs with starter fluid, then you have a fuel issue.

*****
I am a little reluctant to type the rest of this out because I'm not certain that the nuances of doing this come across well in typed words.
You do need to be careful when dealing with fuel sources. Especially ones under pressure in metal containers. Bad stuff can happen. Youtube-worthy bad stuff. Try at your own risk.

Warning: starter fluid is extremely flammable. The car can backfire through the throttle body and shoot flames. Yes. Really.

Some options on how to administer the starter fluid.

Remove the paper air filter so you can see the butterfly. Leave the hood open
Spray some starter fluid in the butterfly before you start the car.
Quickly hop in and try to start the car, then hop back out and go to the front of the car.
Judiciously and as safely as possible, give small bursts towards the butterfly to see if it can keep the car running.

Another tactic possible is to briefly remove the front hose on the throttle body (the one with the spring clamp) and spray small bursts towards the opening. If car takes over and starts running on its own it'll be very choppy until you replace the hose.

A more brutish way to make sure the starter fluid gets to the intake is, with the car off, stick a longhandled screwdriver or something similar down the throat of the throttle body to force the butterfly to remain slightly open. Once you give the car power, the throttle body will kinda battle against this and throw a code, but let's ignore that for now. We're just trying to ensure that the starter fluid that is sprayed into the butterfly gets to the intake.

I've also used a propane tank with a rubber hose as a fuel source instead of starter fluid.

The general idea is to see if introducing a known-good fuel source allows the car to run for a bit. Even running choppy would be count. Anything beyond the normal spin from the electric motor.

If it "runs" from an alternate fuel source, then you question the quantity/quality of fuel coming from the gas tank.

As always feel free to call for a better explanation.
And can I mention again you try these suggestions at your own risk?

 

Ill never understand why people buy a 10 year old car with 1/4 million miles and try to rebuild it.. its always going to be a worthless money pit. even if you got the car for free its not worth the effort.. anyway as for the lack of power Id check for a clogged catalytic convertor, ill assume you did a compression check before rebuilding the bottom end of the motor if not do one, you might have bad rings or worse.

 

Check fuel pressure with a fuel pressure gauge.
Off the top of my head it should be around 42 psi or so if I remember right.

And...
Unless you know FOR SURE that the gas is less than a few weeks old, pump it all out and start with brand new known-good fuel.

 

Sounds like you are making headway.
Thanks for keeping us up to date.

Your posts are a good road map for others.

 

i'm having the same issue with my Prius and the same codes are coming up. Can you please tell me what you did to get the issue sorted out? Please help.

 

hi did you ever fix this problem?

 

So, if you have these codes, C1310 and C1259 it could mean anything and not necessary that you have a bad brake regeneration system?

 

C1259 and C1310 both are codes that are set in the brake ECU.

But the brake ECU only sets those codes because of messages it gets from the HV ECU about codes there, which are issues somewhere in the car's hybrid system. So these two codes only mean that the brake ECU is aware of the hybrid system issue, so it knows it is on its own to brake the car, and can't ask for help from the hybrid system.

So whenever you see these two codes, you know that you just need to get the trouble codes from the HV ECU and find out what is really wrong with the car.

Some people use generic code readers that only show these two codes, and not the ones in the HV ECU (because these codes are in the brake ECU, and all cars have brakes, so generic code readers know to look there). So if that happens, and you're not seeing the HV ECU codes that will really tell you what's going on with the car, then you need to either get a better code reader, or get the car to somebody who has one.