lost on what to do next

If you plan on working on this car yourself, you would need to have proper diagnostic equipment to read codes.

You can't guess with a prius. Go and get the codes read

 

Are you testing voltages on the 28 hybrid battery modules or the auxilary battery?

 

Ok just checking, 9 volts at rest is way to high. If that is what you were measuring I wouldn't trust that meter.

On scanners don't waste your money on anything from your local auto parts store. Order an OBD 2 adapter online and download an app for a few $.

I like Engine Link for iOS devices or Torque for Android.

 

After you get that new meter, check the 12V battery too. There are threads on this forum on testing modes and thresholds. A small drop in mpg is one indicator of a failing 12V.

But definitely get a good scanner. Some of us use the Mini VCI adapter and an old 32-bit laptop--it's not very robust or user-friendly, but it works for DIY and if you have an old laptop, it's under $20.

 

Are we talking about the 12 volt or hybrid now? The hybrid I'm completely clueless, but I believe you should check their behaviour with load?

 

Someone on this forum has detailed a method to put the hybrid battery through a charge cycle using the car, while graphing block voltages using the Mini VCI adapter. Others laboriously bench test each module with bench charger(s) and light bulbs. There are threads about that too. It seems to take over a day to do that.

Note there are 14 blocks, each an assembly of two modules. The modules contain the battery cells. The car's ECU is able to track block voltage and internal resistance.

The 12 V battery, by comparison has six cells and the individual voltages cannot be measured.

 

welcome!

how many miles on her?

 

Sounds like you're on the right track with that cell. I would also order a grid charger from Prolong Battery Systems. Extending the life of your hybrid. – Hybrid Automotive . I had two Gen 2 Prii till I traded the '05 in the other day on a Plug In. The one I traded had 150,000 miles on it and the battery still acted like a new one. The '07 with 120k on it runs just as well. These grid chargers can often rescue a failing battery and it will for sure extend the life of the battery. I won't bore you with the details here. There are lots of threads here about it and a good explanation on the web site.

 

Hi Kris, for your triangle of death issue I recommend an OBDLINK LX reader and Hybrid Assistant application.

These will allow you to read the cars hybrid system, and torque will allow you to read, and clear any codes.

Take a note of any codes, and Google the codes, and you should be able to get an idea of the problem.

Hope this helps, Paul.

 

These two applications (found on play store) and reader are for Android. If you are on Apple, there is a Wi-Fi OBDLINK MX, and you'd need to check the app store for applications

Posted via the PriusChat mobile app.

 

Don't forget usbseawolf2000's PIDs. http://priuschat.com/threads/gen2-prius-custom-pids-for-torque-android-app-with-formulas.95370/

Also, set the protocol to ISO 15765-4 CAN 11bit 500k baud or you could corrupt your CAN bus. Read more: http://priuschat.com/threads/i-scanned-my-prius-to-death.132930/#ixzz3CJ8k8IZF

Good luck. Please let us know how it goes.