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Thread: Laggy Accelerator Fix?

  1. #1
    Join Date
    Jan 1970
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    Northern Tasmania
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    Laggy Accelerator Fix?

    There has been a discussion on the American Land Rover Forums about a PCM Module upgrade to fix, or at least improve issues with the Laggy Accelerator.
    While I'm sure this is just an problem of turbo lag, I find it particular annoying and almost dangerous.
    Has anyone in Australia heard anything about this upgrade particularly in reference to the SD4 engine.
    There is no mention on the American Forum if they are talking about the petrol or diesel engines.
    My local dealer knows nothing about this issue.
    D2a (Sold)
    MY17 D5 SD4 SE

  2. #2
    Join Date
    Jan 1970
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    St Helena,Melbourne
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    I don't think they get a diesel version in the us.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  3. #3
    Join Date
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    I think they now get the V6 diesel in the US in the D5, but certainly not the SD 4. I saw it reviewed in a US video. There was no diesel in the D4 from what they were saying in the video.
    Bob

    2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
    2013 Range Rover Vogue TDV6
    2017 Disco Sport SE 132kW Ingenium

  4. #4
    Join Date
    Jan 2011
    Location
    Mornington, Vic
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    IMG_8892.jpg
    This fixes it.

    Been done a couple of time in the D5 Facebook owners group.

    Easy to fit, plug in and play
    2018 SD4 SE Discovery.. Under Assessment :o)
    2014 TDV6 Discovery (...gone)
    2005 TDV6 SE Discovery (....gone)

  5. #5
    Join Date
    Dec 2011
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    Bundeena, NSW, Aust
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    Quote Originally Posted by greg-g View Post
    There has been a discussion on the American Land Rover Forums about a PCM Module upgrade to fix, or at least improve issues with the Laggy Accelerator.
    While I'm sure this is just an problem of turbo lag, I find it particular annoying and almost dangerous.
    Has anyone in Australia heard anything about this upgrade particularly in reference to the SD4 engine.
    There is no mention on the American Forum if they are talking about the petrol or diesel engines.
    My local dealer knows nothing about this issue.
    Not sure if you've tried this but, a simple non-cost option to try is to leave the car in sport mode especially in traffic. The only time I don't use sport is on the highway. I find that the acceleration response is far more natural and it is more inclined to do what you ask of it. When approaching an intersection or roundabout that you are anticipating you might need a little extra go, then drop it down a gear or two before you get there. I have found there to be negligible impact on fuel economy when doing this.

    I went from a twin turbo D4 to a single turbo RRS both engines have about the same numbers and the first time I tried to overtake someone in the RRS I got caught out badly by the lag. From that time on it's been sport mode all the way and while there is still some, it's not enough to cause me issues... it's countered by manual shifting.
    Last edited by SBD4; 14th August 2019 at 12:38 PM.
    Cheers,

    Sean

    MY16 RRS TDV6 3.0 SE Fuji White
    MY10 D4 TDV6 3.0 HSE Baltic Blue - Gone

  6. #6
    Join Date
    Apr 2010
    Location
    Gosford, NSW
    Posts
    170
    The following was posted on a US site by somebody who had the fix done a few weeks back. I take no responsibility for its accuracy or otherwise. I have asked if any fix was available for the RRS, but local LRA people wont admit that there is anything wrong, and they found no outstanding PCM update (I did not ask about ATCM update).

    Accelerate forward
    Cause:ATCM software issues.

    performed pathfinder diagnostic.
    found codes U2300-54 ( central confit missing )

    checked ATCM SOFTWARE LEVEL found update available.

    UPDATED ATCM. JPLA-14D024-AC to JPLA-14DO24-AD

    JPLA-14D025-1C to JPLA-14DO25-AD

    checked GWM SOFTWARE LEVEL FOUND UPDATE AVAILABLE.
    UPDATED GWM JK52-14DO25-AD
    UPDATED GWM JK52-14F530-DE to JK52-14F530-DG, JK52-14F531-DD to JK52-14F531-DE

    CLEARED ALL FAULT CODES

    I will now share with you the history and the Official reason for the delay issue.

    A few years back there was a problem, in Extremely hot year round climates typical of overseas the transmission bushings were burning out prematurely. So Land Rover needed to make a decision, redesign the bushings or remap the torque curve. seeing that a redesign of the bushings was not feasible they opted to change the PCM calibrations to delay the torque output of the engine. Rather than selectively change PCM via region they opted to do so all across the board.

    They came up with a PCM update to delay the torque output curve. For existing years 2014-2017 they implemented the new calibrations via an update. For years 2018 onward they would be built using the new specs. Anyone who owned an earlier model who never noticed a delay would now notice one after the update was performed during service. Their official response to everyone was this is how it is designed and every Land Rover owner across the globe is going to have the same performance. so any complaints where initially met with this very frustrating response.

    The complaints continued but fell on deaf ears. it was not until too many owners were complaining to dealerships refusing to drive there vehicle until something was done to fix it that made them take careful notice. The shops were reporting weekly about all the complaints. Until finally the engineers were able to get corporate to listen to their appeals to let them change things.

    Once they decided to try and figure out what to do it was not so easy. See the 2014-2017 vehicle where built with a earlier strategy, they could just be rolled back, but the newer ones were never built with anything else but the new platform. so they needed to come up with a new PCM calibration that could be installed on the new vehicles.

    In my opinion those with the earlier models being rolled back will have better performance than those with newer ones. the new calibrations although correct the delay will still show a difference in torque curve from the older ones.

    I held off posting until I knew when the fix would be in, it was supposed to be released earlier but of course it was pushed back. the fix was out and installed on some vehicle with special authorization but not widely available to everyone until today.

    The fix was in today's Pathfinder release 102. make an appointment with your dealer to have this installed. .

    RRS SE SDV6 with Dynamic MY15.5 Yulong White, with LLAMS

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