Hybrid System Question

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by TwoPriusInTenn, Jul 11, 2019.

  1. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    2010 Prius 278,000 - Intermittent problem - Check Hybrid System - I put it on my Tech Stream POA80 code. All the cells in the hybrid battery appear fine (16.25 volts or above per set). Symptom is car is sluggish and getting lower than normal gas mileage. Anything else I should be looking for?
     
  2. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    4,346
    4,663
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    Look at the freeze frame data for the P0A80. It will show all battery data from when it coded.

    Directly to the left of the code, there will be a snowflake icon. Click on it. That's the freezeframe data.

    Also look at shortwave highest value. This is a measurement of the HV isolation. 5.00 volts is perfect. The lower the voltage reading, the worse the condition of the HV isolation to the car body. This should be under hybrid system, not under the HV battery screen. May be different for different versions of TS.
     
    Raytheeagle and TwoPriusInTenn like this.
  3. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    Thank you. When this happens we usually clear the code and it runs fine. Such is the case right now. When it shows up again, I will this.
     
  4. ericbecky

    ericbecky Hybrid Battery Hero

    Joined:
    Mar 12, 2004
    4,357
    3,157
    1
    Location:
    Madison, Wisconsin
    Vehicle:
    2005 Prius
    Model:
    Two
    Simply looking at the data when the car is at rest may not expose the problem.

    You should put the battery under some stress by aggressively charging or discharging it while watching the data.
    For example power brake it.
    Take a pic of the screen that shows the battery block data.

    Did you happen to note what the Delta SOC value was. Is it under 20?

    Be careful about multiple successive clearing of battery errors. It can turn into a real mess if a battery module pops/bursts back there.
     
  5. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    5,302
    3,732
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Haven’t heard of this technique before.
     
  6. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    Here is what came up...
     

    Attached Files:

  7. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,137
    15,247
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Looks like block 5 has a bad cell;).

    I’d start there(y).
     
    Grit likes this.
  8. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base

    Thank you. I saw that during this read.
     
    Raytheeagle likes this.
  9. Dxta

    Dxta Senior Member

    Joined:
    Nov 7, 2016
    1,890
    746
    0
    Location:
    Lagos
    Vehicle:
    2008 Prius
    Model:
    II
    Not just block 5, but all the modules in that pack are put of balance. You probably need to opened up that pack, and take a look.
    From the short wave frequency, being below, 4.99htz, that tells me that the modules in the pack may have suffered a lot of leaks either from their terminal posts, or the plastic housing the cells themselves.
     
    Grit likes this.
  10. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    4,346
    4,663
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    After looking at those attachments, I would say "moneyshot". Look at the short wave highest value. You have significant problem with your HV isolation. Along with that, your ENTIRE battery has been depleted. Obviously, block 5 is the weakest and appears to have a dead cell, but that battery is probably at 3-4% SOC MAX.

    I'll step back just a sec, I guess it would make a big difference whether this freeze frame was from a code that came in under hard accel or if it was a code that came in with no load applied. If hard accel, then the voltages are probably as expected, with block 5 having a dead cell. I also agree with Dx that you'll probably find the HV isolation issue is inside the battery case. Look for discolored areas on the base plate. That's normally a giveaway for an electrolyte leak.
     
    #10 TMR-JWAP, Jul 14, 2019
    Last edited: Jul 14, 2019
    Dxta, Grit and The Critic like this.
  11. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    Thank you. When the code appeared, I had just put it in drive and was accelerating. I will check and replace the cells in block 5. While in there, I will also check the inside of the battery case.

    I so appreciate your input.
     
  12. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,204
    42,708
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    has anyone mentioned balancing?
     
    Grit likes this.
  13. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    5,302
    3,732
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Not yet, but smashing moles as their heads pop up from the ground w/a hammer is funner than hooking up additional cable harness to the hv battery.
     
    bisco likes this.
  14. Dxta

    Dxta Senior Member

    Joined:
    Nov 7, 2016
    1,890
    746
    0
    Location:
    Lagos
    Vehicle:
    2008 Prius
    Model:
    II
    Of after you've worked on the battery, and you get an isolation fault, you need to take a closer look at your transmission system. This is because from your statement, you said the problem came immediately you put it in drive.
     
    mjoo likes this.
  15. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    Thank you. I think this was an isolated incident as far as when it set off the error code. My wife said it was showing signs of flashing this code while she was driving earlier in the day. No other error codes other that the POA80-123.
     
  16. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    I know there has been much conversation regarding the numbering of the cell blocks. Is block number 1 the closest to the ecu or the one furthest away on Gen 3 (2010 Prius)?
     
  17. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,137
    15,247
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Furthest away
     
  18. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    Thank you.

    Another question, when accelerating the engine seems to shutter at first and then even out.Even when sitting still and pressing the gas pedal. No error codes. Anything else I should be looking for?
     
  19. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,204
    42,708
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    is all the engine maintenance up to date? at 280k, it could be anything
     
  20. TwoPriusInTenn

    Joined:
    Nov 27, 2015
    141
    44
    0
    Location:
    Florida
    Vehicle:
    2004 Prius
    Model:
    Base
    Thank you. Yes, up to date.

    I'm am thinking it is a dirty EGR piping, intake manifold or throttle bottle. All are easily accessed and cleanable.
     
    Raytheeagle and bisco like this.
Loading...