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Auxiliary battery instantly draining code on

Discussion in 'Gen 2 Prius Main Forum' started by Brandon Mason, Jun 27, 2019.

  1. Brandon Mason

    Brandon Mason New Member

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    My auxiliary battery is draining instantly got a brand new one and same thing. Been going at this for two weeks now started with crankshaft position sensor low voltage and now I’ve changed the position sensor the wiring the ecu and the battery. I’m at a loss at this point
     
  2. PriusCamper

    PriusCamper Senior Member

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    Instantly? That doesn't make sense, it should take a little bit of time... Did you replace with a yellow top Optima? If so, that's the problem. If not, there's likely a short in the 12v circuit somewhere or 12v still has power but not connected due to blown fuse or some other problem.
     
  3. edthefox5

    edthefox5 Senior Member

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    Why if it’s an optima that’s the problem? Never seen one that did that. I’m on my 2nd year with a yellow top.

    Hard to comment on the op issue as we know nothing about what got him there except a cam position sensor that he mentioned and why was that and wiring and ecu replaced?

    Code on.....ok what’s the code? If you don’t know what that code is that’s a big part of the problem.
     
  4. PriusCamper

    PriusCamper Senior Member

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    There's so many problems with poor quality optimas that I've documented many times on here...

    The amount of PriusChat denial of the poor quality of that junk battery maker is so extreme that I became angry enough to ban myself from PriusChat for 6 months and I've been back on here for less than a month. So please don't go there with me and let's focus on helping the original poster.
     
  5. Brandon Mason

    Brandon Mason New Member

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    It’s an amg battery, I’ve made a couple of other forums sorry for the skipping of P0340 aka camshaft position sensor low voltage
     
  6. Brandon Mason

    Brandon Mason New Member

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    It started at the top and I watched it drop bars to 0 in maybe 20 seconds
     

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  7. TMR-JWAP

    TMR-JWAP Senior Member

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    ummm...Brandon? that display is for the HV Hybrid battery....not the 12v aux battery.

    Have you done any work on the HV battery lately? Perhaps you didn't fully install the safety disconnect?

    Can you start from the beginning with what symptoms you were experiencing? What codes you had?

    Perhaps you had a CPS fault and the engine kept trying to start, but ended up draining the HV battery because the engine wouldn't start with a failed CPS?
     
  8. Brandon Mason

    Brandon Mason New Member

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    It all started when I hit a bump in he road that pushed me into a curb. This bent my right passenger control arm. I fixed this and the car seemed to be fine, but made some kind of break rubbing noise for just a second and then never did it again. I woke up morning to drive down the road and everything died. I had the car towed home and hooked it up to my scanner and found p0340. I replaced the sensor and it was still throwing the code, so then I checked the wires to the sensor and replaced the end. Then o checked the plug at the ecu rewired it then finally I replaced the ecu and did a reset to link it to the car. I go to turn the car on, it runs and kicks the engine on and tries to do a rev cycle and gets to higher rpms and sounds like a clunk and the gas engine dies. Still the same exact p0340 code.
     
  9. TMR-JWAP

    TMR-JWAP Senior Member

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    What are you using to read codes? It sounds more like the engine tried to start, but failed. Remember, the HV battery spins the engine fast enough that it actually appears to be running, but gives up after about 10 seconds if the engine fails to actually start. Do this a few times and the HV battery is drained, preventing it from having enough energy to try again. If this is the actual situation you're experiencing, your real problem is going to be finding a way to get the HV battery charged back up again.

    The engine ECU has many parameters that are "learned" or modified during engine operation. Any time the 12v battery is disconnected, these parameters will return to their original default values. Sometimes, these default values are so different from the "learned" values that the engine won't start. Usually this involves the throttle body position. It may be wise to check the throttle body, mass air flow meter area and give them a good cleaning. Carbon buildup has been known to cause problems.

    Remember the basics. It takes air, fuel and ignition to make an engine run. The proper amounts of each and the proper signals for each.

    If you don't have techstream, it would be a good investment to allow better analysis.
     
    #9 TMR-JWAP, Jun 28, 2019
    Last edited: Jun 28, 2019
  10. Skibob

    Skibob Senior Member

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    I think your still angry. Rather than get the full story and find it’s actually the traction battery you went full Optima hate.
     
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  11. cthindi

    cthindi Member

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    Please try with AC off.

    I have a 2005 too. I notice these days the battery discharges too fast, much more so since summer since summer started.

    I have also seen this happen after the car is parked for 2-3 days without use. When I start it after a few days, battery shows SOC same as when it was parked. But it goes down in no time, like 20-30 seconds you mentioned.

    I am attributing that to internal discharge of the battery. The SOC shown on screen, probably is not current. The car probably shows the cached SOC, which goes down rapidly as it is refreshed. With battery capacity diminished over nearly 15 years, that is not surprising.

    I typically force charge the battery before parking it for a few days. Though I now avoid parking the car for more than 2-3 days.
     
  12. Brandon Mason

    Brandon Mason New Member

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    So trickle charging the HV battery now. I’m still getting the p0340 after swapping out every component is what doesn’t make sense. I get p0340 p0A60 and the generic abs codes for bad battery.
     
  13. edthefox5

    edthefox5 Senior Member

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    Brandon how are you trickle charging the HV battery? Do you mean the 12. Volt battery?
     
  14. Brandon Mason

    Brandon Mason New Member

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    I hooked my charger to the jump and a ground.
     
  15. TMR-JWAP

    TMR-JWAP Senior Member

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    Brandon, we're trying to help you but you AREN"T listening. The display on your dash with the colored bars is for the HV battery, which is the great big 201 volt battery located behind the rear seat. The jump point under the hood is for the 12v battery, which is located in the trunk at the passenger side rear cubby hole.

    If your HV battery is dead, as we suspect it is, it takes a special high voltage charger to fix that issue.

    The last time we had someone on here (unfortunately I don't recall their ID right now) that had a similar problem with getting the CPS fault, it ended up being the coupling between the transaxle and engine had failed. Since the HV battery uses the tranaxle to spin the engine for starting, the engine never turned, making the ecu think there was a crank position sensor fault.

    Engine seized? 118k miles | PriusChat

    The HV battery would just drain itself trying to start the engine, but the engine would never actually turn over.
     
    #15 TMR-JWAP, Jun 29, 2019
    Last edited: Jun 29, 2019
  16. PriusCamper

    PriusCamper Senior Member

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    HI Brandon, do you have a friend or mechanic that can help you get your car fixed? We can give lots of detail information and walk you through almost anything so you can repair it for almost nothing compared to what a dealership charges, but we're getting lost in how you're translating/interpreting the info? Maybe if you had someone who could read through this thread with you and help with your next reply so we can make some progress?
     
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  17. Brandon Mason

    Brandon Mason New Member

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    My engine turns over for approximately 20 seconds. What other information is needed at this point? I was unaware that I could charge the battery from the jump point, I always had assumed that point was for the HV. I can send a video of what is happening upon start of the car if need be.
     
  18. Brandon Mason

    Brandon Mason New Member

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    No if I try to engage drive it’ll go for a second but the car acts like the break is on and moves a tiny bid forward but does not spin the wheels in either forward or reverse
     
  19. TMR-JWAP

    TMR-JWAP Senior Member

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    Brandon,

    The jump point under the hood is in the 12v fuse box. It's explained how to jump the car in the owners manual. Your misunderstandings (or our misunderstandings of what you are trying to explain) are making it even harder than usual to help troubleshoot over the internet.

    You've replaced sensors, wires, ecus, yet you don't recognize the difference between a 12v system and a 200 volt hybrid system. You connected a 12v charger to what you thought was a charge point for a 200v system. Do you realize if that WAS a HV point, that charger cable/clamp probably would have vaporized in your hand and you would probably have a bunch of holes in your arm/face from flying molten copper? That is a precursor to getting dead. You don't understand how the hybrid system works or how it integrates with the engine. Do you recognize that the 12v system merely powers the electronics/lights/fans/pumps in the car? Do you realize it's the HV battery, at 200+ volts that spins the engine to make it start? It spins it so fast that it appears to actually be running? If the engine doesn't actually start, it gives up and codes out. Do you realize it can only do this a handful of times before it becomes depleted? Once it's depleted, your game is done. Every time you disconnect the 12v battery, it resets the ecu to a default HV state of charge around 60%, and will be happy to try to spin the engine again, depleting it even further, but it will drop immediately to one or zero bars once the car detects the true state of charge of the HV battery?

    IMHO, you are in over your head. It's time that you seek professional help from an experienced hybrid shop.
     
    #19 TMR-JWAP, Jun 29, 2019
    Last edited: Jun 30, 2019
  20. Brandon Mason

    Brandon Mason New Member

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    Now that I do know all of this from several people telling me, my uncle is a 20+ year electrician and may try to charge/replace a few cells. I’m going to use Techstream to see if I can find my voltages, and if all else fails, I will pull the battery and have Toyota charge it.