To keep a long story short, my 04 Prius recently had engine problems so a friend and I did a full gas engine replacement on the car. Everything went well enough, we weren't left with any left over screws or connectors and we put fluids back into all the right places. When we went to turn it on however, we get the red ! of death as well as the ABS, check engine, etc lights. The ODB2 reader finds no fault codes, the Prius diag mode has no errors, and I even just today replaced the 12v battery. Still getting the same issue. I did check and the new battery is sitting a bit low at 12.2v. At this point, I'm at a loss and REALLY don't want to have to take it into a shop and possibly pay more than the damn thing is worth to fix it. Anyone have any suggestions?
welcome! start by charging up the 12v to eliminate the low hanging fruit. if that doesn't do it, you will need a prius aware scanner. if there are dash lights, there are codes and sub codes. tech stream is the best, but some others will work.
The orange interlock on the hv battery needs to be locked into place. Insert into battery, flip up switch, then PUSH DOWN to lock it into place. Many people miss this step
Checked the plug. It was correctly latched in place and pushed down. Thanks for the suggestion though. I'll try charging it up tomorrow night. I just quickly searched Tech Stream and it looks like the adapter and software costs about $1500. Am I missing something or is it really that expensive?
The Toyota professional Mongoose Pro from Drew Technologies J2534 cable with Techstream is probably around that price. Most of us use a cheaper J2534 cable like VxDiag Nano for Toyota or the cheap and nasty cheaper Mini VCI cable. Both come with Techstream. Respected member here @ChapmanF recommends the Tactrix Openport 2.0 made in California. In order of quality (best to worst) and price (most expensive to cheapest) it goes Openport, VxDiag and Mini VCI. For the latter two, if buying on Amazon or eBay, read the reviews and choose a local seller that gives good support and has positive product reviews, especially if you opt for the MVCI.
Well, the Drew Technologies MongoosePro, which is the one Toyota tests and officially supports, is more expensive than all three. -Chap
You, of course, are correct. In my head I was thinking that those three were cheaper alternatives to the Mongoose, but didn't expressly state that. Perhaps I should have written, "Of those cheaper alternatives, in order of quality (best to worst) and price (most expensive to cheapest), it goes Openport, VxDiag and Mini VCI."
