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Old 07-09-2017, 10:31 AM   #1
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Prius plugin charging

Just purchased a 2012 prius plugin, it does not seem to be able to take a full charge. I have had it on the charger for over two hours starting with a partial charge and the display gives no more than 8.5 miles estimate. Are there any methods to check weather the charging system is working properly? Any suggestions would be welcome.
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Old 07-10-2017, 06:08 AM   #2
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That estimate is taking into account how efficiently the car was driven previously, and is not just a straight measure of the charge level. I think you need a scanguage or similar to see the actually charge level.
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Old 07-10-2017, 01:58 PM   #3
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Thanks for the response. I'm not familiar. Could you explain how a scanguage works, what would such a device cost, Is this a do it yourself type thing?

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Old 07-10-2017, 11:51 PM   #4
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I just fitted a ScanGauge E to my Honda Jazz/Fit, just yesterday. It costs around 100, here in the UK. It took two minutes to fit. It just plugs in to the OBMII port, under the dash, and I velcro'd (supplied) it to the top of the steering wheel binnacle. It took 5 minutes to set up. It gives lots of useful data including instantaneous mpg, average mpg, cost/hr, coolant temp, load, ignition timing, throttle position, and many more I have still to get to grips with.
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Old 07-11-2017, 04:19 AM   #5
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Thanks I don't think a scangauge is right for me. Would the dealership be able to do somekind of onetime diagnostic to determine if the traction system is working properly?

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Old 07-11-2017, 04:42 AM   #6
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What's the mileage? The range is only roughly 11-15 miles when fully charged. If the car is high mileage, and charged alot (or sat unused alot) the battery capacity may have degraded somewhat over the 5 years.
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Old 07-11-2017, 04:47 AM   #7
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Thanks, it's only got 81,000 miles, but I don't know it's history. Can the original capacity be restored?

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Old 07-11-2017, 04:53 AM   #8
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You could fork out for a new battery pack, but at $2.5K would you want to?
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Old 07-11-2017, 05:06 AM   #9
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I don't know nothin' on Prius'. Is the battery one pack? Or is it more than one actual battery?
I have much confidence in Toyota. If you bring it in to them. They can troubleshoot it. Perhaps it isn't such an expensive fix? Only a couple cells in one of the batteries is causing the lessened charge?
I am confident it's because of the battery age.
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Old 07-11-2017, 06:07 AM   #10
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I personally give it more time to see if improves, get worse, or remains steady. It takes 3 hours to charge off of a standard outlet, assuming it is pulling 12 amps.

The charge rate isn't a flat rate. It goes faster when the battery is 'empty', but as it approaches full charge the rate drops. This reduces the heat generated and risk of damage to the pack. So those last few miles of range will take longer to charge.

Priuschat has a lot of knowledgeable users.
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