Inverter Pump

yes, there should be movement in the reservoir. you shouldn't be losing coolant, so that's your first job.

isn't the fuse detailed in your o/m? on the gen3 i think it is the am2 fuse, not sure of the location.

everything you need is at techinfo.toyota.com, but isn't it under warranty?

 

If you value your time, use the Health Check feature of a Toyota Techstream diagnostic system to scan for diagnostic trouble codes (DTCs), and then use the procedures corresponding to each DTC in the Repair Manual (more info) to guide further troubleshooting.

 

New Prius owner here, I was wondering whether it failed inverter coolant pump always triggers a Dtc. I have been checking my inverter coolant reservoir tank and I noticed some vibration in the liquid but I'm not sure whether it is the turbulence that people say you should see if the pump is running correctly. Thank you very much

 

Has anybody replaced their inverter coolant pump on a gen 4? Do these fail as often as the older generations?


Thanks

 

if there's any movement with the engine off, it is working

 

Oh alright, thanks.

So, in ready mode with the ice off, there is no movement of the coolant.

I ordered the pump. It was about 270 usd before tax. I just hope this solves my issue.

 

me too. make sure there's voltage at the connector

 

StrippedShrimp, did you ever replace the inverter water pump? Did it solve the issue?

 

In gen 1 and gen 2, the inverter cooling pump was just a dumb electric pump that could be off or on, and it would be on whenever the car was in IG-ON or READY, whether the engine was on or the car was moving or not.

Starting in gen 3, the inverter cooling pump is variable speed, and the car is more clever about when it is and isn't needed and how fast it needs to run. That makes a "turn the car on and go look for turbulence" test a little bit less definitive.

But the gen 3 and later pump does supply more information back to the power management control ECU. It has a tachometer, just like the engine water pump, so you can see with a scan tool how fast the ECU wants it to run, and how fast it is running, and there are several different trouble codes that can be set (all parallel to the codes you can get for the engine water pump, but different codes, of course).

You get the live data and codes for the engine water pump from the ECM, and the live data and codes for the inverter pump from the power management control ECU (or in gen 4 did they go back to just calling that one the HV control ECU?).