Resetting "Trip B" & "Fuel Economy" Screens ? - Jeep Garage - Jeep Forum

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Old 06-06-2015, 03:25 PM
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Resetting "Trip B" & "Fuel Economy" Screens ?

Do these 2 screens reset independently of each other when you, "Press OK To Reset"? Or will they both reset at the same time? I ask because I wanted to know before I tried it. Neither has ever been reset since I bought the car. Which means since it left the factory. I would like to keep the, "Trip B" screen as is, because it has the total hours on the vehicle. So it would be nice to leave it, while being able to reset the "Fuel Economy" screen that shows current MPG, as well as average MPG.

I just wanted to know before I tried it. I've always thought a total hour meter was very useful on a car because it allow you to figure the average MPH the car has been driven since it left the factory. That can tell you if it's seen just stop and go city driving, or highway mileage. Mine currently shows about 19:30 hours at 450 miles. That averages to around 23+ MPH. Considering I haven't been on the freeway with it yet, that seems correct. Sitting at stoplights kills your MPH average more than people realize.

Anyway, I just though I would ask before I fooled around with it.

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Old 06-06-2015, 03:44 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Yes


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Old 06-06-2015, 04:10 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

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Originally Posted by billt View Post
I've always thought a total hour meter was very useful on a car because it allow you to figure the average MPH the car has been driven since it left the factory.
I concur. Apparently the earlier WK2's had an "engine hours" readout as well (available on-dash), which I would find quite valuable with a diesel engine. Too bad.

Anyway, in terms of readouts there is also a "run time since DTC last cleared" value available via OBDII. Of course, I cleared a MIL once so my value is no longer equal to total engine time either.

BTW, I believe the trip counter time in EVIC will continue to count up if you have the Jeep in "on/run", even if the engine isn't running.
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Old 06-06-2015, 05:53 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Trip A, B and the fuel economy with trip meter gauges all reset independently.
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Old 06-06-2015, 08:19 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Thanks guys.
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Old 06-06-2015, 08:21 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

One thing I haven't figured out is how does it know the range after you refuel? I didn't touch anything after I filled up, yet the range went back up to over 400 some miles. Does it have sensors in the tank?
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Old 06-06-2015, 08:25 PM
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Quote:
Originally Posted by billt View Post
One thing I haven't figured out is how does it know the range after you refuel? I didn't touch anything after I filled up, yet the range went back up to over 400 some miles. Does it have sensors in the tank?
There is some kind of algorithm that considers your "recent" rolling average fuel economy and multiplies that by the amount of fuel in the tank.

The echo chamber suggests that this rolling fuel economy average is over the past ~300 miles, but that is just a number that has been repeated enough to acquire "truthiness", rather than being an officially documented fact. Anyway, this range estimation isn't something that resets with any of the trip/fuel economy number gauges.

If you have been flogging it around town recently and then go off on a laid back highway cruise, don't be surprised to see your remaining range numbers *increase* as you drive farther. Heh.
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Old 06-06-2015, 10:19 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Keep in mind that both trip counters only keep fuel stats on the last 300 miles or so.


I think the hour meter will wrap too, but I may be wrong.
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Old 06-06-2015, 10:25 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

My hour meter kept going for over a year before it got cleared during one of the TSB software updates.
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Old 06-07-2015, 07:00 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

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Originally Posted by MDBones View Post
My hour meter kept going for over a year before it got cleared during one of the TSB software updates.
If one feels that keeping track of hours is important, it would be a good idea to write down the total hours before you take your vehicle in for any type of dealer service. That way if it gets cleared you would have a way to keep a running total on the car.
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Old 06-07-2015, 07:49 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Quote:
Originally Posted by billt View Post
If one feels that keeping track of hours is important, it would be a good idea to write down the total hours before you take your vehicle in for any type of dealer service. That way if it gets cleared you would have a way to keep a running total on the car.
An hour meter isn't that important to me personally. I was just replying to where mswlogo thought that maybe the accumulated time rolled like people think the average fuel economy does.

The way this is set up it's purely a time/distance function of the trip odometers. Like the actual odometer, I don't think you'd be able to reset a true engine hour meter. That would defeat its purpose.

I reset trip A at every fill up. I leave trip B run untouched for as true of a running average that the system allows. After about a year of driving I had accumulated quite a number of hours on B. My fuel economy average on B was different from A, which was to be expected with the changes in fuel economy due to the temp changes between summer and winter and 4WD being more active in winter. The numbers I observed were very much in line with this.

Not trying to start an argument over this assumed 300~ mile rollover in fuel economy calculation but I can't honestly say that I've ever seen anything on my A and B trip readouts that would make me believe it's true.

The other thing I find hard to believe with that thought is what sense would it make to set the system up to do that when your driving range on a tank of gas or diesel is far in excess of 300 miles?
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Old 06-07-2015, 08:44 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

What convinced me that an hour meter was important, was when I bought my boat. I had an hour meter installed before I took delivery. When I sold it 7 years later, I only had 72 hours on the motor.

I would have guessed it to be much higher, because we used it a lot. With a car it's the exact opposite. I was a bit surprised to see mine had 19+ hours with only 400+ miles. Cars generally have a very low average speed they're driven. Especially in the city.

Look at a lot of these people in California and Boston who commute 2 hours each way to work every day. Most of it sitting in bumper to bumper traffic. That amounts to 80 hours a month, or close to 900 hours a year, just going to work and back. When you consider how slow these engines turn on the highway with these modern 8-Speed overdrive transmissions, that's a lot of wear in relationship to the actual mileage. An odometer can be a false indicator under such circumstances. An hour meter can make a liar out of it real quick.
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