U0100 code

Hello: I recently replaced the headgasket, timing chain, etc. on my v. That seems to be the simple part. The engine will not start (starter does not even engage) and I have a U0100 code. I have checked all the connectors (even took them off and cleaned them with brake cleaner), batteries are in good order, and I am at a loss. Any suggestions will be welcome.

 

Hello I picked up a 2012 Prius v wagon for a swan's song because it had a blown headgasket. I bought it to give to my granddaughter but now beginning to doubt my own wisdom. I have never worked on a hybrid before so the stuff beyond the IC engine is new to me. Had the head resurfaced, valves ground and new headgasket, chain, etc. In so doing I pulled the wiring harness off to the right side of the engine (viewed from front) and tied it out of the way with a strap. After reconnecting everything (at least that is what I thought) I was anxious to drive it out of my shop. However, not! Engine would not even turn over. I got U0100 code and message (My reader does not provide the secondary bits, 211, 212, or 530). I have gone over every connector, cleaned them with brake cleaner, etc. to no affect. I even popped the two large connectors off the ECM and cleaned them. No corrosion - clean as a whistle. Batteries are charged. I have ordered a cable so I can put Techstream on my notebook so I don't at this time know which of those 3 secondary codes might come up. However, in the meantime can you all give me some advice on where or how to chase down each of those codes?

I assume the ECM in this DTC code message is the "computer" on the right fender well with the two connectors I described above. However, where is the PCM? Please don't tell me it is behind the glove box. And, how does this CAN work. Are there copper wires, fibre glass, or what between the various ECM units?

Additionally, I saw a website that described how to reset the ECU. He said to disconnect the HV and LV batteries, unplug the heavy power cord in the fuse box, wait a few minutes, reconnect the HV and LV batteries, replug the power in the fuse box, press the start button on and off 3 times. Does this really work or does the car simply burst into flames? OK, its been a long day. Thanks for your reply. Jim