Hi Everyone, I had the check engine light come on in addition to the red triangle. I would really appreciate if you could look at the attached diagnostic reports and suggest what I should be fixing. I will be replacing the catalytic converter. It also looks like some cells on the hybrid battery are bad, so I will probably be replacing those. What I don't understand is that the P3011 shows that block 1 is weak however if I look at the voltage its the other cells that seem to be weaker. Am I missing something here? Any help and input would be greatly appreciated. Thank you.
P3011. This error indicates a malfunction in the pair of modules numbered 1. The error is generated by the difference in voltage between adjacent pairs. As you understand, the difference can be higher or lower. If there is an abnormal internal resistance or electromotive voltage in the battery blocks, the battery ECU determines that a malfunction has occurred. The engine system has errors in the catalyst and in the incorrectly functioning fuel mixture formation in the engine. When the air–fuel ratio feedback is stable after warming up the engine, fuel trim is considerably in error on the RICH side (2 trip detection logic) There are errors in the hybrid part as well. First, it is necessary to deal with errors in the high-voltage battery.
So, the various ecu's have a memory buffer that "records" some data as the car operates. If a fault triggers a code, then the ecu saves a snapshot of that data for the freezeframe. The thing is, there can be some time lag between the fault happening, the ecu figuring that out, and saving the data. Add in the update speed between frames of data, and you might not see the actual "fraction of a second" point in time when the fault occurred. You should see the general operating conditions. If you use your scantool to monitor battery block voltages while driving, you should see what's going on (Dr Prius app is a handy option to view live battery data). Posted via the PriusChat mobile app.
That pack is way out of balance, with 0.8 volt difference between blocks 1 and 7. If you can find somebody nearby with the tools to rebalance it in the vehicle, perhaps do that before you start swapping modules. What is the history of this pack, is it a rebuilt one? Does it have a warranty? If so, use it.
Its a reconditioned battery and is about 4 years old that's when I replaced couple of bad cells on this battery.
Yeah I noticed it too. As the battery is out of warrant I'll just replace the bad cells and rebalance it. That's the project for this weekend hopefully.
Thanks for the info. I don't have Dr. Prius app, I wonder if it's possible to do with the Toyota tech software.
Of course, it is necessary to sort out the modules in order to maintain equality of voltages of adjacent pairs of modules in transient modes.
