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  #1273  
Old 05-07-2014, 02:56 AM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Hi

not sure if you have had other responses but if you are a full time or even part time left foot braker i can tell you exactly what the problem is.

The computer is designed to expect that you have your foot on the brake or the gas pedal. Not both. Sometimes it gets confused and produces an error message and then throws it's hand up cutting out the power.

I have done some tests and the way to correct the problem is to lift your foot right off the power and then back on, or dab the brake again with your left foot.

This has happenned to me at least 15 times, one time I nearly got wiped out at a roundabout.

Jeep know about this but do not consider it a problem and do not consider any rectification is needed. I certainly hope no one is seriously injured or worse before they rethink the thing.

I believe Porsche had the same problem years back and they fixed it.


Peter
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  #1274  
Old 05-07-2014, 07:56 AM
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Not sure if you read about Toyota and run away vehciles but since then all fly by wire systems will throw an error when they see input from both brake and gas in momentary states (whether Toyota had an issue or not). They want the system to assume there is a problem if there is intermittent short contact by both peddles.

I also drive a Porsche Cayenne and if you left/right it enough it throws a throttle control error (sometimes stored)

Edit: The Porsche is a 2013 and has the latest update.
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  #1275  
Old 05-07-2014, 08:17 AM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Indeed. And left-foot braking (two-foot driving) is considered to be improper vehicle operation and operating technique in any case. I realize that those that do it often are incensed when they are told that but the reality is that is flatly the case.


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  #1276  
Old 05-07-2014, 05:43 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Willx

I must admit that I did not think about the Toyota thing but remember listening to a phone call from a policeman in the states trying get help for the problem on the freeway and it ended up killing him and his whole family. The terror in his voice was chilling. Given that scenario then it is understandable why they the put the cut out in except that it does not happen all the time only sometimes and that is the problem.

Peter K

I agree with your comments. Two foot braking is not considered the proper way to drive and I rarely two foot brake. Only in tight or dangerous situations where a very fast response it required.
Unfortunately there are lots and lots of us who consider ourselves to be right foot brakers.
I am 63 and only when the issue with the car arose was it pointed out to me by a Jeep serviceman that I left foot braked. He asked me to make a turn accross tarffic on a very busy road.
Because the power delivery off idle is not smooth (feels to me like torque converter than turbo lag). You can't put your foot on throttle without covering the brake if you are afraid the car is going to lurch into traffic. For that you need two feet

So I accept your point about two foot braking, but what does that mean to the tens of thousands, possibly millions of us that do so without even realising it and find ourselves in a life threatening situation because the the engine power is cut. There has got to be a better way to protect the many thousands of drivers like myself than telling us not to do something that we do without knowing we do it.

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  #1277  
Old 05-07-2014, 05:56 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Just picked up a '14 GC silver limited 4x4. Luv this thing. Drives really nice. First thing i did was str8 to tint shop then str8 to az from so cal. Literally did 1200 miles on it in 2 days. Got back from trip and still hav some fuel. Too cool. I luv diesels. Ya'll dont even want to see my other diesel

Anyway , first thing to make for this is a skid plate of some sort for that stupid def injector and harness. That is a real stupid design. Well not design but routing is horrible.
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  #1278  
Old 05-07-2014, 06:06 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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Originally Posted by Peter 1 View Post
Willx

I am 63 and only when the issue with the car arose was it pointed out to me by a Jeep serviceman that I left foot braked. He asked me to make a turn accross tarffic on a very busy road.
Because the power delivery off idle is not smooth (feels to me like torque converter than turbo lag). You can't put your foot on throttle without covering the brake if you are afraid the car is going to lurch into traffic. For that you need two feet

So I accept your point about two foot braking, but what does that mean to the tens of thousands, possibly millions of us that do so without even realising it and find ourselves in a life threatening situation because the the engine power is cut. There has got to be a better way to protect the many thousands of drivers like myself than telling us not to do something that we do without knowing we do it.

Peter

Well...I haven't noticed the power delivery issue you mentioned. Or I modulate the way I use the throttle to compensate. I find I have to compensate for every vehicle I drive as they are all different. I don't compensate by left-foot braking as that is improper and as you see, leads to other issues.

Honestly, I don't follow your driving style. I don't remove my foot from the brake unless I want the vehicle to start to move. If I don't want it to "lurch into traffic" I keep my foot on the brake. It SOUNDS like you are braking with your left foot and using your right to suddenly accelerate when you want to pull out into traffic. If that is the case, you are driving improperly to begin with. If you are needing that kind of response you are not pulling out into safe openings and should leave yourself more room. In other words, you are creating that "life threatening" situation of your own accord and you can't expect an auto manufacturer to change how a vehicle operates to accommodate such driving.



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  #1279  
Old 05-07-2014, 06:07 PM
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Peter 1,

Before we get too far off on the throttle control thing I will say this... There is simply too many variables when it comes to 2 pedal input and I am sure they cannot qualify them all. I think Porsche does a good job of it and Jeep does a pretty good job of it (maybe not to the extent of Porsche but comparable). It is there as a safety feature similar to FCW to help "avoid" a problem. Due to the variables involved though each time either pedal is pressed in too close conjunction with the other the more often the issue may arise. I watched someone drive my jeep and hit both peddles so often that it came up with service throttle control.

Anyway, I am not asking anyone change the way they drive especially someone with your experience. Simply that the systems primary design is single foot driving and that the engineers have tried to include all other variables but two foot driving will very likely cause more troubles.... That is all.
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Old 05-07-2014, 06:08 PM
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Quote:
Originally Posted by dom42 View Post
Just picked up a '14 GC silver limited 4x4. Luv this thing. Drives really nice. First thing i did was str8 to tint shop then str8 to az from so cal. Literally did 1200 miles on it in 2 days. Got back from trip and still hav some fuel. Too cool. I luv diesels. Ya'll dont even want to see my other diesel

Anyway , first thing to make for this is a skid plate of some sort for that stupid def injector and harness. That is a real stupid design. Well not design but routing is horrible.
Congrats!
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Old 05-09-2014, 08:41 AM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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I got the flash done, after about 100 miles its down to 96%. Still seems to be dropping too quickly, but will give it some more time....


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Just dropped my jeep off to get the flash done... quoted them the TSB and the girl asked, "umm... how did you even know about this? That TSB hasn't been released to the public yet..."

I just looked at her mysteriously and said... "I have my ways."



Of course, then I let her in on the truth...
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  #1282  
Old 05-09-2014, 09:55 AM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

I had the flash done 300 miles ago. Now showing 93%. At that rate, it will be at 0 around 4,000 miles. Pretty much the same as before the flash. Either the dealer didn't install it properly or it didn't make any difference. I may try another dealer and see if they can tell if the flash was in fact properly installed. If none of this resolves the issue, I'll probably just ignore it, reset it when it gets to zero, and change the oil every 5,000 or 7500 miles. My wife's Jetta is good for 10,000 but I don't want to push it.


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  #1283  
Old 05-09-2014, 10:16 AM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Vtail,

What is the average miles you do in a week? Since I had mine done, I am seeing closer to 700-800 miles per 10% which seems like it makes sense to me.

Before the update, I was closer to you, it would be recommending a change at somewhere between 4000-5000 miles.

I suppose it is possible that they did not run that update and YES another dealer can compare the existing "Part Number" of the flash to the current offering. If your new dealer is "nice" see if they will tell you what the part number of the flash in the computer is.

If the dealer is not running the current WiTech version, this flash is not available for them to run.
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  #1284  
Old 05-09-2014, 03:47 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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Vtail,

What is the average miles you do in a week? Since I had mine done, I am seeing closer to 700-800 miles per 10% which seems like it makes sense to me.

Before the update, I was closer to you, it would be recommending a change at somewhere between 4000-5000 miles.

I suppose it is possible that they did not run that update and YES another dealer can compare the existing "Part Number" of the flash to the current offering. If your new dealer is "nice" see if they will tell you what the part number of the flash in the computer is.

If the dealer is not running the current WiTech version, this flash is not available for them to run.
I agree. I just hit 2,300 miles on my diesel coming back from Big Bear yesterday and the oil life remains at 58%. It has been holding that for about 400 miles. That still works out to the first oil change being at about 7K miles. We'll see I guess.
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