How often do you really need an oil change? - Page 4 - 2018 Honda Clarity Forum
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post #31 of 37 (permalink) Old 07-30-2020, 10:42 PM
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On a similar note if my engine hasn't started for a month on its own I go ahead and run HV briefly just to keep things circulated. Maybe that's not necessary, but I still think it's a good idea because we don't really know for sure how well the engine does when not run for several months. I'm not saying it will ruin it, but I also think the Honda engineers assumed that someone buying a PHEV will use the gas engine every once in a while. They did seem to build in a safeguard for that with the System Check that occurs, but some people say their engine sometimes goes for months without running. Probably that's okay, but it's so easy to just fire up the engine for a few minutes each month just to be sure..
I've discovered the Clarity PHEV does have an equivalent to the Volt's Engine Maintenance Mode so it will take care of itself when you're not using the ICE. You'll hear the ICE running but the car will show it's still in EV mode.

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #32 of 37 (permalink) Old 07-30-2020, 11:44 PM
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I've discovered the Clarity PHEV does have an equivalent to the Volt's Engine Maintenance Mode so it will take care of itself when you're not using the ICE. You'll hear the ICE running but the car will show it's still in EV mode.
Yes but my point is we have no idea how often System Check runs. I have never experienced it even though since March I have twice gone more than a month without using ICE. And there was no highway or freeway driving during that time, only surface streets, so it is unlikely that ICE would come on without me hearing it. When ICE finally did come on it was because in both cases I accelerated into the gray area on the power meter. My experience of going over a month seems pretty common.

At least one person has reported that their car sat parked for over a month, and they fully expected ICE to run the next time they drove it, but it didn't, and didn't for several days and if I remember correctly they finally just ran HV because they felt that was too long for the engine to not run.

Pinning down the frequency of "true" System Check among Clarity owners is nearly impossible because in my opinion based on reading people's accounts they are often attributing normal startup events to System Check, like people who are not aware of the full battery regen ICE startup, they don't associate the ICE startup with using regen on a full battery (who in their right mind would?) and so they attribute it as a random ICE startup. And I really believe many people momentary accelerate just a smidgen into the gray area for a second without realizing it, but when you just barely go over like that even though ICE starts it seems to just idle and you can barely hear it until you stop at a light or whatever, causing people to think it was a completely random ICE startup.

I wish it told you in the maintenance screen, engine will start in (x) number of days if not used. Since it doesn't we are left to just guessing about it
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post #33 of 37 (permalink) Old 07-31-2020, 12:12 AM
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Yes but my point is we have no idea how often System Check runs. I have never experienced it even though since March I have twice gone more than a month without using ICE. And there was no highway or freeway driving during that time, only surface streets, so it is unlikely that ICE would come on without me hearing it. When ICE finally did come on it was because in both cases I accelerated into the gray area on the power meter. My experience of going over a month seems pretty common.

At least one person has reported that their car sat parked for over a month, and they fully expected ICE to run the next time they drove it, but it didn't, and didn't for several days and if I remember correctly they finally just ran HV because they felt that was too long for the engine to not run.

Pinning down the frequency of "true" System Check among Clarity owners is nearly impossible because in my opinion based on reading people's accounts they are often attributing normal startup events to System Check, like people who are not aware of the full battery regen ICE startup, they don't associate the ICE startup with using regen on a full battery (who in their right mind would?) and so they attribute it as a random ICE startup. And I really believe many people momentary accelerate just a smidgen into the gray area for a second without realizing it, but when you just barely go over like that even though ICE starts it seems to just idle and you can barely hear it until you stop at a light or whatever, causing people to think it was a completely random ICE startup.

I wish it told you in the maintenance screen, engine will start in (x) number of days if not used. Since it doesn't we are left to just guessing about it
System check seems to run on my Wife's Clarity about every six weeks, just like the Volt's EMM. She's retired so I periodically take it to work (49 mile round trip) and I'll hear it after about six weeks. I 100% agree that Honda really needs to publish this type of information so owners aren't surprised when the car does self-maintenance.
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2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #34 of 37 (permalink) Old 07-31-2020, 07:18 AM
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I have discovered the ICE run with the car in EV mode with plenty of battery only once since I bought the car in March this year.
Since I generally try to run the ICE once a week or so, does the system account for that so it does not run that task?
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post #35 of 37 (permalink) Old 07-31-2020, 10:56 AM
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Originally Posted by Trolle View Post
I have discovered the ICE run with the car in EV mode with plenty of battery only once since I bought the car in March this year.
Since I generally try to run the ICE once a week or so, does the system account for that so it does not run that task?
Yes.

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #36 of 37 (permalink) Old 07-31-2020, 12:22 PM
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I have discovered the ICE run with the car in EV mode with plenty of battery only once since I bought the car in March this year.
Since I generally try to run the ICE once a week or so, does the system account for that so it does not run that task?
I would think so, in spite of the fact that people claim that even though they run ICE at least once a week they still get system check every once in a while. But as I mentioned I suspect that those aren't really system check they are more likely just normal ICE startup events, but the driver didn't connect the dots with recent activity like harder than normal accelerating or doing regen on a full battery. If ICE is running at least once a week there would seem to be no reason for it to start up ICE during EV driving to do a system check.
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post #37 of 37 (permalink) Old 07-31-2020, 01:18 PM
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I have had the System Check run once and it was after about 8 weeks of pure EV.
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