Hybrid Transaxle Temperature Monitoring

Is there even a trans oil temp sensor in these? The fluid never bears the driving load like in a traditional trans with torque converter, so I'd think there's little need.

There are other temp sensors in the transmission, and they are there for parts that are soaked in the ATF bath, so perhaps just as valuable for your purposes. I'd think you could read MG2 temp and see all you need there.

 

Starting at 7:40 and going to 9:15 We see both external oil lines and external coolant lines, adding a Temp sensor for oil or coolant or both would be easy, a 'radiator' for the WS ATF oil would be easy. (previous Prius all had internal channels, so it would be harder)
If the Gen 3 Prius does not have sensors for what you want, here are examples.

www.amazon.com/Bosch-SP0F000049-Style-Electrical-Temperature/dp/B00UZ9H59A (ATF or water)

www.amazon.com/Hayden-Automotive-676-Rapid-Cool-Transmission/dp/B000C39CL8

I would be temped to add the transmission cooler and skip the gauges.

 

The fluid used is ATF though, so it doesn't stand up to heat as well as a fluid used in manual transmissions.

The gen3 Prius doesn't have a tow rating even in countries in which people do tow with small cars. The gen4 has better cooling for the fluid, so Toyota gives it a tow rating for those markets, still lower than comparable cars though.

The Xgauge function of the Scangauge II allows the programing of gauges beyond the standard ones. A transmission temperature display is one possible, and the Prius appears to have such a sensor. So that might be an option.

 

its only a motorcycle on small trailer ?? just make sure the tires on the car and on the trailer are all well inflated, lube the trailer bearings, and go...

 

I’d think we’d be more concerned about the inverter-coolant temperature. (Well, meaning the inverter temperature.)

 

Yeah, I too am inclined to think that it’s probably not a huge concern, perhaps unless you plan to climb mountains with it. Admittedly though, I don’t have a lot of data to back up.

However, I’m pretty sure I recall my brother’s family pulled a small trailer with their 2005 (Gen.-2) Prius.

 

Hybrid Assistant monitors this. It shows on the app display and also is reported with the companion Hybrid Reporter app. Here is an example of the report:

 

Maybe I am missing something, but I am looking for normal operating range temperatures for the transaxle (either MG1 or MG2). I have been using OBD fusion to monitor temps and my motor generator (MG1 or MG2) gets up to 205F (driving for hours at 70). I am trying to figure out what’s normal. Thank you in advance.


iPhone ?

 

My 2012 Prius C Motor Generator 2 temperature got to 116° C on a hilly trip today while taking my brother to a construction site work.