Trailblazer (Automatic) 4wd system




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  1. #1
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    Default Trailblazer (Automatic) 4wd system

    Hi, I'm struggling to fully understand my Trailblazer's 4wd system. I noticed two things, which could be related to my issue. I have only used it off road once before so I guess more practice will make understanding it easier but this is my question: I noticed when the car is switched over into 4wd LR that the traction control is automatically switched off. In 4wd HR this is not the case and this can be switched off manually by keeping the TC button in for 3 sec's. First of all , why would you or in what circumstances would you want to switch off the TC when you are in 4wd HR?
    Secondly, I noticed when I tackled a couple of "axle twisters" in 4wd LR, that the car's TC did not kick in and the wheel that was in the air just kept on spinning whilst the limited slip diff did not kick in to get traction. Why would this be? Is it possibly related to the fact the TC is automatically switched off in 4wd LR thus not letting the limited slip diff do what it is supposed to do?
    In 4wd HR I negotiated the axle twister obstacles without any issues and could sense the moment when the limited slip diff kicked in to grab the wheel with no traction and immediately sent all off the power to the other wheel.
    Any help on this will be greatly appreciated. thanks.
    2014 Chevrolet Trailblazer 2.8 Auto 4x4
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    I don't know your vehicles system so hopefully some of the guys who have one can help. Each vehicle can be rather different. I still find these treads interesting.

    TC is a very broad term. Usually when you engage 4L it's the ESP that switches off.

    An example of where you'd switch off TC (or partly) in 4wd HR is on fast Offroad conditions like on dunes.

    But it's interesting that when in 4L that one wheel kept spinning with 3 still in the ground. That suggests that the centre lock wasn't engaged, which is odd unless it's a Landy. But if it's a proper axle twisted where 2 diagonal wheels are off the ground then TC doesn't always help.

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    limited slip diff will not lock completely , I know the grandcherokee 's think wk(last sfa) ? , was very sensitive to which oil you used in the diff.

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    Quote Originally Posted by globaljaco View Post
    Hi, I'm struggling to fully understand my Trailblazer's 4wd system. I noticed two things, which could be related to my issue. I have only used it off road once before so I guess more practice will make understanding it easier but this is my question: I noticed when the car is switched over into 4wd LR that the traction control is automatically switched off. In 4wd HR this is not the case and this can be switched off manually by keeping the TC button in for 3 sec's. First of all , why would you or in what circumstances would you want to switch off the TC when you are in 4wd HR?
    Secondly, I noticed when I tackled a couple of "axle twisters" in 4wd LR, that the car's TC did not kick in and the wheel that was in the air just kept on spinning whilst the limited slip diff did not kick in to get traction. Why would this be? Is it possibly related to the fact the TC is automatically switched off in 4wd LR thus not letting the limited slip diff do what it is supposed to do?
    In 4wd HR I negotiated the axle twister obstacles without any issues and could sense the moment when the limited slip diff kicked in to grab the wheel with no traction and immediately sent all off the power to the other wheel.
    Any help on this will be greatly appreciated. thanks.
    Hi Jaco

    The normal on road TC get disabled for off road it control throttle and torque to control wheel spin you do not want that in a off road situation.
    When in LR the BTC (Brake Traction Control) is activated this will brake any of the spinning wheels to transfer torque to the wheel with traction.
    A video I posted before the Isuzu Dmax in the first world use the same system as the TB a nice demo of how it works.
    https://www.youtube.com/watch?v=HmKG6raANdg
    Real engines use spark plugs

    2012 Trailblazer 3.6 V6
    2017 Jeep Grand Cherokee 5.7 HEMI

    Philip

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    Quote Originally Posted by Vcollerp View Post
    Hi Jaco

    The normal on road TC get disabled for off road it control throttle and torque to control wheel spin you do not want that in a off road situation.
    When in LR the BTC (Brake Traction Control) is activated this will brake any of the spinning wheels to transfer torque to the wheel with traction.
    A video I posted before the Isuzu Dmax in the first world use the same system as the TB a nice demo of how it works.
    https://www.youtube.com/watch?v=HmKG6raANdg

    Hi Phillip,

    So does the 2013 Trailblazer have the limited slip diff or the BTC (Brake Traction Control)?

    Tobie
    Last edited by TJWM; 2015/09/25 at 08:23 AM.
    -Tobie-
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    '17 Ford Kuga 1.5T Trend Auto
    '18 Jurgens XT65B
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    Quote Originally Posted by TJWM View Post
    Hi Phillip,

    So does the 2013 Trailblazer have the limited slip diff or the BTC (Brake Traction Control)?

    Tobie

    Hi Tobie


    Both actually but the BTC will react faster than the diff.

    Real engines use spark plugs

    2012 Trailblazer 3.6 V6
    2017 Jeep Grand Cherokee 5.7 HEMI

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    Quote Originally Posted by XJ Junkie View Post
    I don't know your vehicles system so hopefully some of the guys who have one can help. Each vehicle can be rather different. I still find these treads interesting.

    TC is a very broad term. Usually when you engage 4L it's the ESP that switches off.

    An example of where you'd switch off TC (or partly) in 4wd HR is on fast Offroad conditions like on dunes.

    But it's interesting that when in 4L that one wheel kept spinning with 3 still in the ground. That suggests that the centre lock wasn't engaged, which is odd unless it's a Landy. But if it's a proper axle twisted where 2 diagonal wheels are off the ground then TC doesn't always help.
    There is no centre diff on a Trailblazer, it is part time 4x4.

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    Quote Originally Posted by Brent Clark View Post
    There is no centre diff on a Trailblazer, it is part time 4x4.

    So in 4 Low it doesn't distribute 50/50 drive?

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    Quote Originally Posted by XJ Junkie View Post
    So in 4 Low it doesn't distribute 50/50 drive?
    Part Time 4x4 50/50 when in 4x4, high or low

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    Either it wasn't engaged or his is broken then. The centre couldn't have been locked.
    Last edited by XJ Junkie; 2015/10/11 at 08:14 AM.

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    I cant believe the TB is a part time 4x4. Ill have to read up a bit
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    Ah, locked in center when in 4x4, so like the 90 prado
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    Quote Originally Posted by sweeper View Post
    I cant believe the TB is a part time 4x4. Ill have to read up a bit
    It is, had one on my course today.

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    Yeah, bit in 4x4 high or low it is fully locked?
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    Quote Originally Posted by sweeper View Post
    Yeah, bit in 4x4 high or low it is fully locked?
    In part time the axles should still be locked 50/50. Perhaps the OP made the wrong selection. One wheel shouldn't spin keeping the vehicle stationary if the axles are locked.

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    Default Fortuner vs Trailblazer vs Pajero Sport

    Quote Originally Posted by Brent Clark View Post
    It is, had one on my course today.
    Hi Brent,

    Please give us some feedback on how the three compared in your opinion.

    Tobie
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    Quote Originally Posted by TJWM View Post
    Hi Brent,

    Please give us some feedback on how the three compared in your opinion.

    Tobie
    Not much between the PajeroSport and the Fortuner, the Trailblazer needs decent tyres, the 18 inch HT is not offroad friendly. It also needs a rear difflock, the traction control is lazy. When you lift wheels, it takes quite a bit of throttle input to get going. The others handle the obstacles with far less fuss.

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    Quote Originally Posted by Brent Clark View Post
    Not much between the PajeroSport and the Fortuner, the Trailblazer needs decent tyres, the 18 inch HT is not offroad friendly. It also needs a rear difflock, the traction control is lazy. When you lift wheels, it takes quite a bit of throttle input to get going. The others handle the obstacles with far less fuss.
    Thanks Brent, much appreciated.
    -Tobie-
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    '13 Chevrolet Trailblazer 3.6 V6 4x4 Auto
    '17 Ford Kuga 1.5T Trend Auto
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    -----------------------------------------------

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