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Old 02-13-2020, 01:56 PM #1
RunningForNow RunningForNow is offline
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Low Idle After Battery Disconnect for 11 Days

I had disconnected the battery for about a week and a half because my wife drove my truck while I was on a long business trip, and one of the buttons on the key fob got stuck, and triggered the panic button in the back of the fob. Before she realized that was the cause, I told her to just disconnect the battery to stop the alarm from going off (I was at a job site and couldn't spend too much time troubleshooting).

When I came home last night, I took the truck out for a drive and run some errands, when I noticed the idle was pretty low, at about 500 rpm, sometimes lower, when in gear. However, after driving around for about 4 miles, the idle slowly went back to normal. I was wondering if this is the expected result after losing electrical power for a prolonged period of time, or should I be concerned? I know the idle rpm is controlled by the ECU, but I wanted to make sure.

Thanks for your help!
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Old 02-13-2020, 03:13 PM #2
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is it back to normal since then or low again on the next restart?

when my alt went out it was doing a similar thing on a test drive and turned out it was barely charging over the amount discharging and i was able to see that by testing the voltage at idle. not certain but maybe low battery couldve caused it and once recharged via alt it came back to normal.
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Old 02-13-2020, 04:01 PM #3
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It needs to relearn the adaptive parameters. Position of the IAC during different conditions is one of them.

It should get better.


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Old 02-13-2020, 05:03 PM #4
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Itís back to normal now. I just wanted to make sure that I donít need to do anything during the re-learn process. I figured if it didnít die at stop lights, then chances are things are ok.

Thanks for the information!
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Old 02-13-2020, 06:24 PM #5
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Quote:
Originally Posted by RunningForNow View Post
Itís back to normal now. I just wanted to make sure that I donít need to do anything during the re-learn process. I figured if it didnít die at stop lights, then chances are things are ok.



Thanks for the information!


Even if it did die it would still relearn pretty quick. You may notice a cold start issue with temperature changes. Warmer or colder doesnít matter. It seems like every 20 degrees is a new adaptive that needs relearned.

The fact that your default adaptive do not work anymore to me means your engine is old and tired, Iím sorry to put it that way......


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Old 02-13-2020, 10:06 PM #6
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I briefly had a 1st gen sequoia that would do that if the battery died, it would stall usually once and then run normally, my 4Runner doesnít do that but Iíve never had the battery disconnected for more than a day or two and never had it die
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Old 02-14-2020, 12:04 PM #7
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My wife's 05 Subaru Outback is can-bus and requires a lengthy procedure of key off/key on, run for a few minutes blah blah blah after a power interruption for idle calibration. If not performed, it will not idle properly. It never re-learns on its own.
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