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Old 01-10-2017, 09:46 PM   #11 (permalink)
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Alright, guys, new problem..Don't wanna start a new thread: as I stated before what really forced me to do a battery reset was that my IMA guage dropped from basically full (3-4 bars short) to basically empty (3 bars from full discharge). Ok, so last night I did the battery reset, it charged back up and has been running fine all day. Right before I go home I stop at the grocery store and between the time I pull into the lot and the time I parked the IMA discharged almost completely..I mean this is a matter of maybe 30 seconds.

I've checked the 12v system and everything is fine. The IMA still wants to charge back up and I've got it charged back up to about 3/4 just from dragging it down the street but I've searched and haven't really found anyone else mention this in particular.

No IMA light, CEL reads p1457 (unrelated, and I'm not really concerned by it). Is my IMA on the way out, or is this an ECU issue? Some kind of sensor?


Off topic: anyone know what the longest running (milage-wise) first gen stock IMA is?
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Old 01-10-2017, 10:11 PM   #12 (permalink)
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See post #7. You just had another negative recal.

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Old 01-10-2017, 10:47 PM   #13 (permalink)
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Time to buy the IMA battery charger.

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Old 01-10-2017, 11:56 PM   #14 (permalink)
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How long do I have, doc? Haha can I drive it to work tomorrow? I get really paranoid when things don't work properly. I HATE when things don't work properly.
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Old 01-11-2017, 12:59 AM   #15 (permalink)
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You are going to suffer from hybrid battery anxiety. One of the primary symptoms is paranoia.

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Old 01-11-2017, 01:48 AM   #16 (permalink)
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Quote:
Originally Posted by KLR3CYL View Post
You are going to suffer from hybrid battery anxiety. One of the primary symptoms is paranoia.

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Old 01-11-2017, 11:33 AM   #17 (permalink)
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Quote:
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You are going to suffer from hybrid battery anxiety. One of the primary symptoms is paranoia.

Scott
Can i get a prescription for that?
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Old 01-11-2017, 01:01 PM   #18 (permalink)
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Sure, just like several of the previous posts, you should get grid charged on that car ASAP. It's kind of like taking antibiotics, should help in many occaisions not always a sure fired cure but can make a pack feel a whole lot better.

You can build one or buy one, like so many other posts indicate. I stock the ones from HybridAutomotive.com.

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Old 01-11-2017, 02:18 PM   #19 (permalink)
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Lotsa good advice already. I'd like to add these bits...

Your car had a grid charger. It likely had one for a reason - it needed it. I suspect grid chargers are more frequently installed AFTER an IMA light than before. This means it's always going to need it. it just depends how often. It could be needed every month, every 3, 6 or 12 months or any number in between. Repeating recalibrations are the most obvious indicator.

As Sam mentioned, you're seeing recals. I'd like to clarify that a bit, so you understand this isn't going away. The only time the car "loses track" of the battery is when you disconnect the 12V. When this happens, it then goes through a forced charge process to see how the pack voltage taps respond to charging. It then calculates a baseline SoC for the current battery temperature, voltage and charge current.

The SoC is then continually computed based on the interaction of those values: tap voltage responses to current for the current temperature. It's iterative and inexact.

A recal occurs when the car says, "HEY BATTERY! You're not responding how you're supposed to at this current and at this temperature!" it's typically cause by one of the 10 tap voltages going too low under load or too high under regen hitting prescribed limits prematurely, so the car does a recal, which is basically the same thing it does when you disconnect the 12V - assume low SoC, force charge, assess response.

I suggest you contact the previous owner and ask him what brand of charger. If it's Hybrid Automotive, ask if the harness was discharge ready. If it's not an HA system, shit can it and buy the Prolong Reconditioning package. If it's an HA system, but it's not the discharge-ready harness, shit can it and buy the Prolong Reconditioning package.

This is only going to get worse and more frequent. Eventually, performance will deteriorate (mileage), and you'll get an IMA light and eventually a failed cell where your only option is to disable/bypass IMA or get a new pack.
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Old 01-11-2017, 02:27 PM   #20 (permalink)
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Get a grid charger.
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