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Old 06-05-2019, 06:56 PM   #1 (permalink)
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Default Autostop issues

The problem started at stops, the engine would fire up randomly and then shut itself off again.
Eventually it stopped autostopping all together.
Climate controls off, up to temp, regen working.
My battery isn't great but I've been grid charging it accordingly. It's a manual transmission.
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Old 06-05-2019, 07:40 PM   #2 (permalink)
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Make sure outside temp sensor behind the bumper is connected and working. Vacuum leak to the brake booster could also cause this.
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Old 06-06-2019, 01:11 PM   #3 (permalink)
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Thanks for the input, the temp sensor is intact. I don't know where to look for a vacuum leak in the brake booster but it's the best lead I have right now!
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Old 06-06-2019, 05:31 PM   #4 (permalink)
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Check your underdash fuses. I vaguely recall some people coming to the conclusion that when autostop begins to fail, particularly not coming out of autostop, one of the fuses is likely bad. I could be mis-remembering, but it's an easy check. Perhaps it's fuse #9 - 'starter signal'?? None of the other labels suggest being related to autostop. Perhaps check 16 and 24 too, then the rest...

If this isn't it, then check your 12V grounds (3 of them) and 12V battery; I seem to remember that being an issue too...
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Old 06-07-2019, 05:31 PM   #5 (permalink)
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After checking damn near all of the fuses, 12v battery, and ground straps, I still have no autostop.
It has me worried I might have an ECU problem.
Thanks for your suggestions, anything else in this thread will be much appreciated!
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Old 06-07-2019, 06:44 PM   #6 (permalink)
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Get a plug in gauge to monitor the 12V battery and report back the voltage at the time you are expecting auto-stop. Also, if the IMA battery voltage is low at the time, auto-stop will be disabled.
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Old 06-07-2019, 08:45 PM   #7 (permalink)
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My HV battery never drops below 80%, I will look into the 12v while driving but parked it reads 13v.
I accidently broke the ambient temp sensor bracket while taking off my bumper but it's still plugged in... I'll see if it's working with an OBDII reader
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Old 06-07-2019, 10:56 PM   #8 (permalink)
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Would a intermittent or misadjusted clutch switch or neutral position switch cause this?
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Old 06-08-2019, 01:08 AM   #9 (permalink)
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Sounds like the IMA might be disabled. Never said it assisted. Batt. always at 80 %.
if IMA is disabled, min. charge to 12V, When 12V gets low, will not autostop.
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Use: 436,000 mi. @ 58.2 LMPG.



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Old 06-08-2019, 01:57 AM   #10 (permalink)
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borrow an OBDIIC&C and watch the boost brake pressure (vacuum)... if it rises about 75% (where 100% is "no vacuum left") , then the engine will stay on. However, this probably isn't the issue, as this would cause auto stop to always work the first two times, and then you'd enter "stop-and-go" mode (where auto-stop is disabled).
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