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2017 Toyota highlander charging system acting strange


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ruggb
Novice

Oct 23, 2021, 5:57 PM

Post #1 of 9 (176 views)
  post locked   2017 Toyota highlander charging system acting strange  

I put a voltmeter on a 2017 Highlander that I just bought. The readings don’t make any sense.

When it is idling in park, the voltage is 14.6V. If I am idling in Drive, it is 12.4V. RPM ~ 700. If I give it a little gas to bring the RPMs back to 1000 it does not change back to 14.6V where it was in park. When I am driving, the voltage is 12.4V. RPM can be anything. If I take my foot off the gas pedal while I am driving, it goes back to 14.6V. That can't be right.

I expect it to be in the 14V range while driving and possibly to decrease if the RPMs fell as in when I took my foot off the gas.

I have checked the belt and it is in good condition and tight. There is no noise that would indicate it is slipping. There are no scan codes present on my Torque app.

Can anyone explain this to me, or is there a problem I can’t explain?


(This post was edited by ruggb on Oct 23, 2021, 6:04 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 23, 2021, 6:56 PM

Post #2 of 9 (173 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  

Why are you testing this in the first place?

You seem to be looking for a problem that doesn't exist. These system don't work the way you are used to.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ruggb
Novice

Oct 23, 2021, 7:22 PM

Post #3 of 9 (166 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  

Why are you answering me with a question instead of an answer?Can you explain why it is working the way I described?


ruggb
Novice

Oct 23, 2021, 7:27 PM

Post #4 of 9 (164 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  


In Reply To
Why are you testing this in the first place?

You seem to be looking for a problem that doesn't exist. These system don't work the way you are used to.



(This post was edited by ruggb on Oct 23, 2021, 7:30 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 23, 2021, 7:31 PM

Post #5 of 9 (157 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  

I asked you because you don't seem to have any reason to be suspecting anything wrong. This system uses a battery state sensor assembly and only turns on the alternator when needed.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ruggb
Novice

Oct 23, 2021, 7:33 PM

Post #6 of 9 (153 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  


In Reply To
I asked you because you don't seem to have any reason to be suspecting anything wrong. This system uses a battery state sensor assembly and only turns on the alternator when needed.



ruggb
Novice

Oct 23, 2021, 7:34 PM

Post #7 of 9 (153 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  

So, why is it needed when I take my foot off the gas as I am driving down the road?

In Reply To
I asked you because you don't seem to have any reason to be suspecting anything wrong. This system uses a battery state sensor assembly and only turns on the alternator when needed.



ruggb
Novice

Oct 23, 2021, 7:35 PM

Post #8 of 9 (150 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  

So, why is it needed when I take my foot off the gas as I am driving down the road?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 23, 2021, 7:36 PM

Post #9 of 9 (146 views)
  post locked   Re: 2017 Toyota highlander charging system acting strange  

OK, enough. If you don't like the way it was engineered then write a letter to Toyota.

I'm closing this now.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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