Motor reving to 3k-4k but not moving

thanks, did they pull any codes?

 

You need to get a mini VCI setup and monitor the pedal position......if it goes beyond 15% with your foot off the pedal then yes, that's why the car is revving in park.

 

Do you have your a/c on full at the time?

But it is sounding like your HV battery is toast. Others may add their thoughts.

 

I agree if this happens in drive it sounds alot like the battery because the battery is needed to engage the electric fields that allow the transmission to drive the car (without this the car will just rev in place).

What do you module voltages look like right now? Did you ever get a mini VCI setup? (If not I highly suggest one!!!)

 

Sounds like the transmission (MG1) or the inverter is at fault then.........curious what the outcome will be.
I have to also assume they changed your 12V battery already too?!

 

What kind of expenses are you incurring with this?

 

Could you please be clear and concise about the problem?

You say "DRIVE", so does this occurrence only happen in the "D" position of the shift lever and no problems in "B" mode? Or by "DRIVE" do you really mean "READY" which is just when the car is on and ready to go?

Does the car operate as normal when *not* letting off the gas pedal?

The Prius engine can idle as high as it wants without moving the car by design. There is no transmission in the common sense of the word, nothing to "kick in" and move the car. A basic misunderstanding of how the car works, will lead to very poor diagnostics.

All motive power is sent through the outer ring gear of the planetary gear system which is MG2. If MG2 is staying static, then the wheels will not move at all. This is why it is important to know if the car moves in general and this is a problem that only occurs when the speedometer is 0.

If nothing is charging the battery with the engine on, it could possibly be an inverter problem.

All of these things can be easily diagnosed with a CAN reader. The $10 devices you can buy on Amazon or eBay.

You can check the reported pedal position of the accelerator on the CAN network. This would show you the pedal, although I never believed that would be the issue anyways.

You can check the RPM of the engine (how are you determining 4K RPM???), the RPM of MG1, RPM of MG2, Current flow into and out of the battery pack (verify nothing is going there), Voltage info of the pack (pack too high, pack too low?) and lots of other important info.

More info needed to try and guess what's wrong. But with the limited (and somewhat contradictory) information provided, I would say it is an inverter or transaxle problem. When was the last time you replaced the transaxle fluid?

 

Do you have a part number?

 

Any theory on why a faulty sensor in the inverter would cause the engine to rev?

 

MG1 is (almost) always keeping engine from revving by generating power. If for same reason inverter didn’t send enough power from it to somewhere (mg2 and/or battery) engine would just rev.

 

X2

I believe the inverter controls the field current for MG1 so if there was no (or not enough) current supplied to the windings then the engine would just rev in place and the vehicle wouldn't move (since there are no mechanical connections between the wheels and the motor itself).

 

I have not heard of a dealer replacing individual inverter parts. Just the whole inverter. The dealer replaced a part, it has a part number. It sounds like they did one thing and said another.

 

Dealers don't buy parts off Ebay either, the OP did (a $225 inverter) , fixed the problem himself, not the dealer.

 

I read that post as they replaced an "inverter sensor" which doesn't make any sense. That's why I wanted the P/N. If the OP just bought a new whole inverter on eBay, then good for him, that's a good course of action.

 

Engine is connected to power split device. In power split device power is (normally) divided into two. To wheels and to MG1. But if MG1 isn’t sending power to anywhere it’s going to turn easily and all power is going to there and non to the wheels.