Inverter or Transaxle failure and how to tell? (P0A7A P0A92)

Picked up a 2004 Gen 2 as a spare to use for parts, but got it home and it seems in unusually good shape so I think I'm going to try and save it. Is there any way to test the inverter rather than just replacing it?

• Was originally throwing a P3009 HV Leak code, disassembled the pack, cleaned it up, tested modules, etc, and put it back together. Code went away.
• Car will start and idle, 12v is charging, HV Batt is charging, throwing codes P0A92 (MG1 control?) and P0A7A (Generator Inverter Performance). Car will go into gear, reverses fine, will only go in drive up to ~15mph.

I've basically narrowed it down to Inverter or MG1/Transaxle failure. Looking at posts on here, usually with MG1 failure it'll sound like a failing bearing or have some other weird noises, this one sounds normal.

From looking around on the forum about codes P0A7A and P0A92, it would seem to indicate that MG1 has internally shorted or the insulation has failed or something. However, looking through the testing procedure as specified in the workshop manual and on other threads, the resistance between MG1 Terminals and between the terminals and ground is all within spec, other threads seem to indicate I should see a short to ground via one of these terminals if MG1 has truly failed.

I'm currently waiting on a friend to get back from vacation to borrow his Megohmmeter, but from looking at other threads, the multimeter test should show something out of the ordinary if it's internally shorted. My miniVCI cable should arrive sometime next week as well so for the moment I'm relying on generic OBD2 codes.

 

Unfortunately Mini VCI cable isn't here yet but should be here sometime next week so I can hook it up and read with Techstream

Battery ECU looked good, no obvious signs of corrosion or anything on the connectors. I don't have a spare inverter on-hand and was hoping to avoid going and buying one before determining if that's what's really wrong. I'm borrowing a Megger to continue testing MG1 (and I'll check MG2 while I'm at it) to really determine what the problem is.

 

I did the initial test with a standard milliohm meter, other threads suggested if the problem was bad enough, something should've shown up. Just got back from testing MG1 with the Megaohm Meter and results aren't good:

• Terminal U: 0.1
  
• Terminal V: 0
• Terminal W: 0

So it looks like MG1 has failed unfortunately