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HV Battery Failing

Discussion in 'Gen 2 Prius Technical Discussion' started by magruder, Sep 25, 2009.

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  1. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Dave, did you replace the traction battery with a salvage one yet?
     
    #21 Patrick Wong, Oct 12, 2009
  2. vertex

    vertex Active Member

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    Don't wait too long, not only will you loose reverse, you won't go forward. The traction battery starts the ICE.
     
    #22 vertex, Oct 12, 2009
  3. magruder

    magruder Average Member

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    Not yet, I've been out of the country, but I'm looking for a good one now.
     
    #23 magruder, Oct 13, 2009
  4. magruder

    magruder Average Member

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    Good point, I didn't think about that, thanks.
     
    #24 magruder, Oct 13, 2009
  5. statultra

    statultra uber-Senior Member

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    are u mechanically inclined and comfortable with working with HV magruder?

    from what it sounds like, although some may not agree it sounds like you have some bad modules or bad module on your battery.

    this is exactly what happened on my 01, it would go from full battery to 1 bar in a very sudden time period and then the triangle will pop up.

    finally i fixed it by replacing the OEM batteries with 2007 prius modules.
     
    #25 statultra, Oct 13, 2009
  6. magruder

    magruder Average Member

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    I do feel capable of replacing the battery properly and without electricuting myself. I found a local battery from a 2007 with 26K miles for $400. I'm planning on taking the modules apart though, I just want to remove and replace the whole battery. I'll keep you posted on how it goes.

    I was wondering, won't the warning light that says the HV battery voltage is low come on before the battery goes completely dead?
     
    #26 magruder, Oct 15, 2009
  7. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Hi Dave,

    In your OP you indicated that the hybrid system warning icon came on. That constitutes sufficient warning of a serious problem. When the traction battery is bad, sometimes the hybrid system icon comes on, other times the traction battery warning icon comes on.
     
    #27 Patrick Wong, Oct 15, 2009
  8. statultra

    statultra uber-Senior Member

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    Usually when the HV battery is going bad youll notice a loss of power. For me on my 2001 prius the engine would rev really high and top speed felt like 40 mph.

    also what you mentioned with the battery going from full to red in 1 minute is a indicator also.


    its very likely that the battery has bad modules and need replacement, it might just be 1 module.

    considering your getting a whole battery, i would just swap with the 07 as long as it has the battery ECU. also i have a battery ECU if you need one.
     
    #28 statultra, Oct 15, 2009
  9. magruder

    magruder Average Member

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    I installed the battery from the 07 Prius. Fortunately, I installed it just enough to test it. The car won't go into ready mode and there are a bunch of warning lights. I checked the voltage on the battery and it is 215 volts so I think it is charged. Is it possible that the new ECU doesn't work with my 04 model? Should I put the ECU from the old battery into the new one? Or is there something else that could be the problem?

    Thanks,
    Dave
     
    #29 magruder, Oct 17, 2009
  10. Flying White Dutchman

    Flying White Dutchman Senior Member

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    did you put al the plugs in the sockets.
    i know you did but you never know just check
    also did you click the HV fuse into place...

    and if you stil have the old ECU and you dont think there is a problem with it there is now reason to even replace it with a newer one.
     
    #30 Flying White Dutchman, Oct 17, 2009
  11. magruder

    magruder Average Member

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    That was my first thought also. I checked carefully for any connections I might have forgotten. I suppose I could put the old battery back in and see if it works, then I would know for sure.

    Thank you
     
    #31 magruder, Oct 17, 2009
  12. Flying White Dutchman

    Flying White Dutchman Senior Member

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    the battery itself is 100& the same.. so that can not be the problem
    maybe you still need to clear the codes from you old hv battery failure?
     
    #32 Flying White Dutchman, Oct 17, 2009
  13. magruder

    magruder Average Member

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    I only replaced the ECU because the new battery came with the ECU. I have tried putting the old ECU in now, but that didn't help.
     
    #33 magruder, Oct 17, 2009
  14. magruder

    magruder Average Member

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    Yeah, I don't think I have the equipment for that. I'll try putting the old battery back in. If the old battery works again, then there is something going on with the new battery I guess.
     
    #34 magruder, Oct 17, 2009
  15. efusco

    efusco Moderator Emeritus
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    I would really double check that orange lock-down connector...there's an extra 'snap' and if isn't completely down you won't have a secure connection and will get all the warning lights you mention.

    If you're positive that's not the problem then I don't know what else to suggest.
     
    #35 efusco, Oct 17, 2009
  16. magruder

    magruder Average Member

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    Um, that's why you're the master and I'm the dum-dum. You're right, I failed to snap the orange plug down. Thank you! I'm so glad that was the problem! I'll let you know how the battery works out for me.

    Best Regards,
    Dave
     
    #36 magruder, Oct 17, 2009
  17. efusco

    efusco Moderator Emeritus
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    Yay! I'm just glad it was that simple. Do keep us abreast.:rockon::rockon:
     
    #37 efusco, Oct 17, 2009
  18. Flying White Dutchman

    Flying White Dutchman Senior Member

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    in post 30 i pointed you to the HV fuse into place....
    thats the same thing ;-)
     
    #38 Flying White Dutchman, Oct 17, 2009
  19. Patrick Wong

    Patrick Wong DIY Enthusiast

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    #39 Patrick Wong, Oct 17, 2009
  20. magruder

    magruder Average Member

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    You're right, thank you too!
     
    #40 magruder, Oct 17, 2009
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