2005 Prius down after stolen/found- U0100

Hi all, some [expletives deleted] stole my prius out of my driveway a month ago. It was recovered a couple of weeks ago, sans catalytic converter, natch. Trying to get it going again, it'll turn on, but the temperature reads "E" and the engine won't start, with an error of U0100, so one of the ECUs isn't talking. I'm suspecting it's the ECU handling the engine, but the thieves didn't even do a good job of rifling through the car for valuables and all the wiring cables seem OK.

I'm pretty handy with keeping my car going, but I've hit a wall here. Any pearls of wisdom greatly appreciated- either a good way of finding which ECU is the problem ( I was thinking of just unplugging them one at a time and seeing if more than one U0100 comes up) or, failing that, a good referral to a smart prius shop near Oakland California.

 

I'm using an OBDLink MX+, but with the add on of Prius codes (I think). Let me dig further. Thanks.

 

OK, digging deeper, it says the ECUs not talking are 7E2 and 7E3.

 

Oh that's just great. I guess since that didn't happen with my first cat steal... This is certainly consistent with what I'm seeing.

Well f it, I'm committed to getting my old horse on the track again. Thanks for the info!

 

I packed it in for the day, but got the report from the techstream app. I'll give it a good look tomorrow and post. Thanks everyone.

 

Hi folks I looked at the .tse file and it says...things. I'm thinking my first course of action may be to replace the ECU that the O2 sensor was attached to and probably fried? Any guidance muchly appreciated.

Attached is TSE file. I also spent some quality time removing the unprintable characters, is there an app out there that can parse this file properly? Surely? Thx.

don't be fooled by the filename extension, I changed it from .TSE to .txt to get it to upload

 

OK, looking at the electrical layout, the engine ECU is to the right of the glove compartment. I ripped out that part of the dash and glove compartment and it seems to be no biggie, provided that's the trouble. New engine ECUs look like they go for a bit more than $200 online, not bad.

Also read a couple of threads here of people's problems after a cat converter theft.

Also attaching pic of the screen techstream showed with errors. I can read the block voltages of the big battery with my bluetooth/OBD widget just fine, and the car will move under battery power. The one thing that doesn't happen at all is any info or action from the engine, leading me to believe the engine ECU is the first thing to replace/check. My AC has been dead for a while, not worried about that.

It would suck if the act of cutting that O2 sensor wire fried a few ECUs, but for the moment "they're not all confirmed dead yet"!

Any wisdom, greatly appreciated.

 

Thanks, mr_guy_man (NJ represent! I grew up in Piscataway) and SFO. Will do all that now.

 

TJR- I'm 90% sure the wires were cut, not ripped out. I'll see if I can find the old one. I already put the new O2 sensor in and plugged it in. First time I had a cat converter stolen, in my driveway, I put in a new one, new sensor and everything worked just fine. This time...not so much.

Thanks again everybody I'm about to go out and commit repair/diagnostics! Will report.

 

O...MG. The 7.5A IGN fuse was blown. Replaced that, took the car for a 20 min spin, everything works

DUDE

Can I send you a little token of my appreciation? DM me.

Thanks to all of you on this thread! What a relief.

 

Oh, it was a perfect storm. somebody left it in the garage overnight without the door closed, dome light drained the battery enough that none of my 12V power supplies could charge it while installed. This was a Monday morning. I left it running in the driveway for a minute to let the car charge it. Got a call from my patent attorney as soon as I went inside, I finished the call with her, went outside (the call was 15 min) and bye bye car. Even with the engine on only some of the time, I guess they went by it when it was running. 8 AM in broad daylight.

Well! I won't do that again. Monday morning brain fog.

Learn from my mistakes, folks!