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Old 11-25-2012, 02:47 PM
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Default low voltage problem

hi
when I was logging, I realized that I have very low voltage sometimes as seen in the picture.

what can be the problem ?
it wasnt like this before..





Old 11-26-2012, 03:36 PM
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Default Re: low voltage problem

I would check to make sure the ecu and the actual measured voltage is the same.

If you are only getting 11v probably a bad regulator on the alternator. I would get that checked out.
Old 11-26-2012, 03:46 PM
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Default Re: low voltage problem

most likely the alternator..
Old 11-26-2012, 05:27 PM
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Default Re: low voltage problem

Check your battery fuse in the under hood fuse box and the alternator field fuse in the cabin fuse box
Old 11-26-2012, 05:29 PM
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Default Re: low voltage problem

Do a load test on your battery with a multimeter.
If the battery has less than 12v with the car off you most likely have a bad cell in the battery.
Old 11-26-2012, 05:44 PM
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Default Re: low voltage problem

Be sure to check all your connections period. Sometimes it's a bad ground that is creating problems with low voltage.
Old 11-26-2012, 07:17 PM
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Default Re: low voltage problem

Double check the main wire from the alt to the battery. If thats fine then its the regulator. Isnt datalogging great for troubleshooting problems?
Old 11-26-2012, 08:31 PM
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Default Re: low voltage problem

If im reading the datalogs correctly, your only having a low voltage problem higher in the RPM's, so I would check the belt, if the belt is fine, I would replace the voltage regulator/ALT
Old 11-27-2012, 05:47 AM
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Default Re: low voltage problem

thanks for all the answers.. I will check ALL and let you know..
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