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  #277  
Old 11-30-2012, 03:32 AM
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Re: Grand Cherokee + sand = FAIL

Hi Brett,

Will be on beach within two weeks.Concerned about sand bogging and being snatched out.In my previous toyota,s I would have in neutral or start wheels moving in gear during coming out of sand.
A bit confused about what gear or disengement of transmission is required to be snatched out of the sand in my 2012 JGC..
Did you have a similar requirement, if so I am interested in any advice.
I have driven on beach many many times with straight lever type 4 x4,s and if reading the Jeep manual is anything to go by is somewhat confusing.
Reason I ask is I am in Brisbane and if it happens (bogged) expect the same as your story.
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Strategy
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  #278  
Old 11-30-2012, 06:58 AM
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Re: Grand Cherokee + sand = FAIL

Hi Strategy,
I've done recovery in gear and wheels moving, no problems.
If you haven't had the fix the best advice I can give you is that the "trigger" for this issue occurring is the ABS. Be careful on the brakes, and when accelerating through the deep stuff keep, keep the power up as needed, but try not to be excessive to the point that wheels start to spin.
The one time I did have the problem I hadn't aired down because I only had to go a few kms up the beach to our destination, and was caught off guard by an unusually high tide. The vehicle felt pretty unstable just before the incident occurred as I had to swerve up into the soft stuff as a rogue wave came in - I also hit the brakes pretty hard to come to a stop to avoid it. So that's exactly how it happened for me...
After that incident, I did LOTs of sand driving in pretty difficult conditions without issue (probably 80% in hi range).
One last thing, just remember the 4wd system will stay active no matter what in low range, so you won't get stuck in this mode (at least not from losing power to the front wheels).
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  #279  
Old 12-02-2012, 01:06 AM
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Re: Grand Cherokee + sand = FAIL

on the mitsubishi pajero if the traction control gets too hot (ie overheats) it will turn off. is this what is happening here?

also some dealers have stickers placed inside the driver's side door hinge area to show which updates have been applied
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  #280  
Old 12-02-2012, 01:12 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by Chip Tuning View Post
on the mitsubishi pajero if the traction control gets too hot (ie overheats) it will turn off. is this what is happening here?

also some dealers have stickers placed inside the driver's side door hinge area to show which updates have been applied
Gday Robert,

No in this case its an error being thrown by the ABS system, which then sends the traction control into a 2WD limp home mode. The trick is to avoid sudden and hard braking in sand so as not to trigger the error. Or leave it in low range as that engages a mechanical lock in the transfer case so it will stay in 4WD irrespective of what the ABS and traction control system is doing.
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  #281  
Old 12-02-2012, 01:18 AM
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Re: Grand Cherokee + sand = FAIL

understood. thanks savvas
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  #282  
Old 12-02-2012, 08:39 AM
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Re: Grand Cherokee + sand = FAIL

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Gday Robert,

No in this case its an error being thrown by the ABS system, which then sends the traction control into a 2WD limp home mode. The trick is to avoid sudden and hard braking in sand so as not to trigger the error. Or leave it in low range as that engages a mechanical lock in the transfer case so it will stay in 4WD irrespective of what the ABS and traction control system is doing.
Questions

If you air down for driving on the sand, shouldn't the traction control shut itself off due to the low tire pressure? If not, would it be a good idea to shut it off when driving in sand?
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  #283  
Old 12-02-2012, 10:22 AM
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Re: Grand Cherokee + sand = FAIL

Hi Bill the quadradrive II and quadratrak II systems use traction control (ESC) to assist with 4wd. It applies brakes to spinning wheels to give better drive to the wheel with traction. As it uses the brakes rather than a Diff locks it is integrated with the ABS module. The low tyre pressure does not have any bearing on the system. In your second question you do raise a good point about disabling the ESC. I posted earlier a review of the srt8 where the author fully disabled the ESC by holding the ESC OFF button for 5 seconds. I'm looking forward to trying this out next time I hit the sand, if only to get rid of the annoying grinding noise of the brakes pumping on and off - actually it will save the brake pads as well.
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  #284  
Old 12-02-2012, 04:28 PM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by Mendo View Post
Hi Bill the quadradrive II and quadratrak II systems use traction control (ESC) to assist with 4wd. It applies brakes to spinning wheels to give better drive to the wheel with traction. As it uses the brakes rather than a Diff locks it is integrated with the ABS module. The low tyre pressure does not have any bearing on the system. In your second question you do raise a good point about disabling the ESC. I posted earlier a review of the srt8 where the author fully disabled the ESC by holding the ESC OFF button for 5 seconds. I'm looking forward to trying this out next time I hit the sand, if only to get rid of the annoying grinding noise of the brakes pumping on and off - actually it will save the brake pads as well.
The 5 second button press to disable ESC doesnt work with the normal GC. When ESC is indicated as off in our GC's, the EBLD function stays on and is always on. This is the function where the brakes are used to emulate an LSD.

In older vehicles you could pull the ABS fuse to disable the function. However with this one, the stability control, traction control and ABS are all on the same set of fuses which indicates to me that they are all operated by one integrated control module. Though I dont know this for sure.
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  #285  
Old 12-02-2012, 06:17 PM
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Re: Grand Cherokee + sand = FAIL

Bugger thanks Savvas
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  #286  
Old 12-02-2012, 06:20 PM
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Re: Grand Cherokee + sand = FAIL

if u pull out the fuse does the car go limp ... it shouldn't and it would be then in constant 4WD (which is better in the sand anyway)

Also I think you will find the system is actually over heating. Pulling the fuse if possible will stop this too of course.
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  #287  
Old 12-02-2012, 11:09 PM
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Re: Grand Cherokee + sand = FAIL

Pretty sure it is not overheating. It's a software bug.
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Old 12-03-2012, 12:16 AM
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Re: Grand Cherokee + sand = FAIL

hopefully gets sorted out what ever it is
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