Engine swap... now showing check hybrid system on dash

You need to sync your new engine to the car. The old engine is out of bluetooth range and the car thinks that you have no engine!
OK, just a joke.
There must be a way to reset the check engine code, but I don't know how.

Mike

 

Two ways to do that:
1. Either disconnect any of the positive or negative battery terminals and leave it that way for 10min, then you reconnect back.
But notice this procedure won't clear any red triangle light though( check hybrid system)
2. If you have access to a code reader, you could clear the codes with that too.

Did he ensured that all connectors related to the hybrid system were connected back after the swap?

 

Has the car been sitting unused since October?

Original HV (high voltage) battery that you know?

 

"Check Hybrid System" won't be about an engine trouble code (unless it would be P3190 or P3191, indicating trouble getting the engine to start or run). It could be about any number of other conditions affecting the hybrid power and control system. It could be related to any number of things that could have been disconnected, nudged, or disturbed during the engine swap. The reason could turn out to be something quite simple, but that only happens once it's been found.

I know it's been said over and over again that the way to start troubleshooting any issue like this is to get the trouble codes from the car's computers that will reveal what they are trying to tell you about. But the reason it's said over and over is because it's true. Trying to guess, you might fix the right thing by dumb luck, or just guarantee your nightmares continue through 2020.

The trouble codes that matter are probably going to be in the hybrid control ECUs, and many ordinary trouble code scanners will not know how to ask for them. The best bet is to have the codes read using Toyota Techstream, which is what a dealer would use, though a lot of people on PriusChat find it useful enough to run on a spare laptop and not have to depend on a dealer for basic information any time anything goes wrong.

 

I had the same issue after I replaced the engine in my 2012. Everything was hooked up properly that I could see. Turned out that the main orange connector was in place but not snapped in correctly. All it took was seating the connector fully and snapping it ALL the way.

 

I’m having the same issue currently. I ran techstream but it couldn’t connect with most of the man systems. How frustrating . The engine does sound pretty good when it turns over but won’t stay running I get 5 codes from a generic OBD2 reader

 

Have you ever posted a Techstream screenshot showing the systems it can/can't connect to?

Your generic OBD2 reader isn't showing all of your codes. Your brake ECU is showing C1259 and C1310, which means there are codes in the Power Management Control ECU, and the reader isn't showing those.*

But it is showing some communication network codes (the U codes). Plus the whole fact that Techstream can't talk to everybody is like a great big red blinking communication network code.

It might be worth your while to get to the bottom of the comm issues. You can find troubleshooting info in the "CAN communication system" section of the repair manual (and you probably don't want to wing it without; comm troubleshooting is fiddly enough even with good information).

I think you'll find tables in that troubleshooting section that will suggest the likeliest places to jump in based on what comm codes you do and don't have, and also which ECUs Techstream can and can't see.

* Just to keep things disorienting, if you had a Gen 2, the P0343 code would be from the Hybrid Vehicle Control ECU (that generation's equivalent of your Power Management Control ECU). There was a Gen 2 thread about that code just recently. But that same code, in a Gen 3, comes from the ECM.

 

Oh sorry that’s from before the engine swap. I borrowed a scanner from auto zone. It was a readout from their scangauge. I borrowed so I didn’t want to take a chance driving it . I have a couple of techstream shots. It is actually the first time I used techstream after a whole night of figuring out how to actually download a functioning copy. I have totally overestimated my ability to navigate the tech.

 

How about the system select screen showing which ECUs it can and can't reach?

 

I’ll hook it up and see what comes up .