2001 died in another state, help?

[Mike Dimmick]

Art's Automotive were trying to resolve exactly this problem when they tried to replace MG2, rather than the whole transaxle. The outcome, unfortunately, was that while MG2 was relatively easy to obtain, the correct shims to set the bearing preload up correctly were not.

I would run through the steps to resolve subcodes 247 and 249, checking what the actual recorded MG2 temperature was, just to make sure it wasn't a bad connection or a problem in the ECU, but most likely it was actually an overheating MG2.

The steps to resolve those subcodes (on Gen 2) are: check the value of MOTOR 1 TEMP in the freeze-frame and active data, check for a shorted or open circuit sensor, check the wiring harness and connector for a short or open circuit connection from the transaxle to the HV ECU, check whether the correct value is shown when the sensor is bypassed, and disconnected at one and both ends. If any of those give the wrong value, the fault could actually be in the wiring harness, a connector, or in the ECU itself.

For anyone like me with access to the Gen 2 service manual but not Gen 1, code P3120 has been changed to a variety of P0Axx SAE-standard codes on Gen 2, as follows:

239-242 => P0A90 Drive Motor "A" Performance with the same INF code
243 => P0A3F Drive Motor "A" Position Sensor Circuit (INF 243)
244 => No equivalent
245 => P0A41 Drive Motor "A" Position Sensor Circuit Low (INF 245)
246 => No equivalent
247 => P0A2C Drive Motor "A" Temperature Sensor Circuit Low (INF 247)
248, 250 => P0A2B Drive Motor "A" Temperature Sensor Circuit Range / Performance
249 => P0A2D Drive Motor "A" Temperature Sensor Circuit High
253 => P0A4B Generator Position Sensor Circuit
254 => No equivalent
255 => P0A4D Generator Position Sensor Circuit Low
256 => No equivalent
257 => P0A38 Generator Temperature Sensor Circuit Low
258, 260 => P0A37 Generator Temperature Sensor Circuit Range / Performance
259 => P0A39 Generator Temperature Sensor Circuit High

Subcodes 234-237 (Energy Balance Malfunction) appear to be equivalent to P0A90 Drive Motor "A" Performance INF codes 604 and 605, and P0A92 Hybrid Generator Performance INF codes 606 and 607. This one's a little less certain as the description is a bit different. There's also an INF code 251 (P0A90, motor)/261 (P0A92, generator) that means magnetic force deterioration, or same-phase short circuit.

[MartinB]

Well it has taken me a while to get back with some more information. It is a little hard to coordinate things when your car is in a completely different state.

Took the car to Tom's Master Mechanics. They want 11000 to replace the transaxle, and inverter.

I have been in contact with Toyota as some of you have recomended. They are supposed to get back to me today.

[reverai]

Ebay had inverter up for sale a few weeks ago for a 2001 to 2003 Prius that was $599 so they are out there...

Steve

[jaywolf]

Originally Posted by Mike Dimmick

For anyone like me with access to the Gen 2 service manual but not Gen 1, code P3120 has been changed to a variety of P0Axx .

I think I have a Gen one service manual at home.
I bough back in 2001 I though I might need it but I never used it.
I think I gave about $400 for all paper three volumes.
make me and offer?

If it come to the point you want to donate the Prius
Vincennes University would take it and pay transportation and you could write off the value.