Resetting "Trip B" & "Fuel Economy" Screens ? - Page 2 - Jeep Garage - Jeep Forum

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  #13  
Old 06-07-2015, 08:21 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Think of the hours put on a squad car engine compared to the actual miles. If any vehicle could use an engine hour meter that would be the one. Yet, I've never driven one that had one.

Edited: I have one on my garden tractor.

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Old 06-07-2015, 08:37 AM
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What's irksome is that the true engine runtime value (in seconds) is in the PCM somewhere. Given that "engine runtime since DTC last cleared (in seconds)" is available via OBDII, lifetime total runtime would likely be accessible if only we knew the correct PID invocation... in exactly the same situation as obtaining transmission temperature, tire pressures, odometer values, fuel tank level, etc.

One thing I envy the T4R owners regarding is that a person can buy a pirated copy of the Techstream dealer software + compatible USB cable for less than $100. It's the equivalent of WiTech for Jeeps. Anyway, yes... I would love to poke around behind the scenes and see what's lurking in the PCM and translate that into Torque PIDs.
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Old 06-07-2015, 09:11 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Quote:
Originally Posted by MDBones View Post
Think of the hours put on a squad car engine compared to the actual miles. If any vehicle could use an engine hour meter that would be the one. Yet, I've never driven one that had one.
Most police vehicles are driven for a set number of miles or years. They are then sold off at auction, and replaced with new ones. It doesn't matter to them because it's always easier to spend the taxpayers money than their own. If I could dump my vehicles every so many years or miles, and had someone else pay for a new one, I wouldn't care about such things either.
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  #16  
Old 06-07-2015, 09:18 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Jeep has the low fuel warning come on when you have about 60km remaining (with an estimated range). What I hate is that when it gets to 50km remaining it changes to LOW (no further numbers).

I would think that is when you really do need to see the countdown to zero !!!

Other car manufactures do continue counting down to zero.

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Old 06-07-2015, 09:30 AM
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Quote:
Originally Posted by Mozzie View Post
Other car manufactures do continue counting down to zero.
I can't help but wonder if this is a false precision thing. I recall riding in a minivan that stalled while driving down the highway, completely out of fuel, with its dash "remaining range" gauge reading more than 50 miles. That's how I learned about the limitations of these things.

50 km is about 30 miles. That's approximately one gallon of fuel remaining in an EcoDiesel, and I'm guessing that one could stall out with that little fuel in the tank if it were to slosh due to driving up an incline (or some other adverse driving conditions).

Anyway, I choose to interpret "LOW" as "may stall out very soon", which is far better user communication than inadvertently stalling while the gauge insists there is range remaining.
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Old 06-07-2015, 09:34 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Quote:
Originally Posted by billt View Post
Most police vehicles are driven for a set number of miles or years. They are then sold off at auction, and replaced with new ones. It doesn't matter to them because it's always easier to spend the taxpayers money than their own. If I could dump my vehicles every so many years or miles, and had someone else pay for a new one, I wouldn't care about such things either.
While it may be easier to not care because they're spending the taxpayers money in larger municipalities, I can say that doesn't go over very well in the smaller ones.

Squad cars around here are generally replaced every 3 years... or roughly between 90-120K miles depending on the size of the patrol area. It's not unusual for them not to be shut off during a shift, especially in winter. That idling time equates to roughly 3 times the actual mileage that the engine sees in its duty life cycle.

In that life cycle they're also very well maintained, much better than most people do with their own personal vehicle. They don't skimp on that... safety issues and down time are not good things.

Squad cars are also built tougher because of how they're used. That, coupled with better maintenance actually make them an excellent choice for a used vehicle for the price you can buy them for.
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Old 06-08-2015, 12:36 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Quote:
Originally Posted by MDBones View Post
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?
I also let my B run since new and Reset A on each fill up.

When I let A go long enough, A matched B EXACTLY (except for hours).

It does clearly have a rolling limit. How big it is exactly, I don't know.

Not sure why it does have a rolling limit. May do it for estimating miles left to go.
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Old 06-08-2015, 12:39 PM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Quote:
Originally Posted by Mozzie View Post
Jeep has the low fuel warning come on when you have about 60km remaining (with an estimated range). What I hate is that when it gets to 50km remaining it changes to LOW (no further numbers).

I would think that is when you really do need to see the countdown to zero !!!

Other car manufactures do continue counting down to zero.

Mine usually displays Low when I hit around 50 miles left.
For some reason it went down to 30 miles left and never showed Low this past weekend.

All I can think of is, it had to do with getting very low MPG compared to normal because I was towing a Trailer. Maybe it thought I was gonna unhook soon
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  #21  
Old 06-09-2015, 01:00 AM
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Re: Resetting "Trip B" & "Fuel Economy" Screens ?

Quote:
Originally Posted by Mozzie View Post
Jeep has the low fuel warning come on when you have about 60km remaining (with an estimated range). What I hate is that when it gets to 50km remaining it changes to LOW (no further numbers).

I would think that is when you really do need to see the countdown to zero !!!

Other car manufactures do continue counting down to zero.

I would bet the lawyers make them do that.

It wouldn't surprise me if some shark took a case of someone who sues because they had to sit on the side of the highway on a hot day after running out of fuel.

"But it said I had another 10 miles left!"

Imagine the trauma that would be inflicted on that poor sap. That's worth $500K at least for personal suffering and wasted time...
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