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Thread: Restricted Performance Event

  1. #1
    Join Date
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    Restricted Performance Event

    Learnt a few things from a restricted performance event recently.
    MY14 3.0L with 77,000km at time of fault.

    Restricted Performance alarm came up with red triangle on dash and noticeable loss in power. Wasnít towing or working hard, just driving on a slight uphill at around 60kph. Able to reset by an off/on ignition cycle and it didn't return. Interestingly no faults seemed to be logged when read with iiD, either when the alarm was active or after off/on ignition cycle.

    Dropped it to dealer with that explanation and was advised later that day of an intercooler hose "distorted" (not split). I didnít get to see the hose or speak to the tech, so have no idea what is meant by distorted. I didn't notice anything odd about the hose that night, albeit when looking with the engine off. I did also have a look to see if the cracked manifold issue was present and found nothing wrong before taking it to dealer. The hose was diagnosed via mass air flow related fault codes that were not picked up by my iiD tool but were read by the SDD system (dealerís diagnostic system).

    I queried Gap about the iiD non-reading and got a response back overnight. There is an iiD menu setting where you activate more of the available fault types. These are not set to "read" by default because certain types are effectively false positives that may occur once only and then disappear from the system. However if I had activated the ďPendingĒ faults in the iiD menu it would have almost certainly matched the SDD reading, noting that you canít test this scenario unless you have an active fault event. This is a feature of the iiD of which I was unaware that is clearly worth understanding for issues like this and another example of great service from Gap.



    The logged fault codes were P006A-00, P1247-00, P00BD-07 and P0235-94.

    Interestingly these codes match exactly with what others have reported when the issue was a sticky secondary turbo isolation valve (compressor shut-off valve), resolved by freeing-up the valve actuator shaft of dirt & grime. P1247-00 is boost pressure not achieved and P0235-94 is boost sensor unexpected operation.

    I think lack of boost is also feasibly caused by a split or faulty hose as per dealer diagnosis and I havenít had a reoccurrence but only time will tell as itís also feasible that the isolation valve has freed up somehow. I know where to look and check the isolation valve thanks to an old thread from when Graeme had the issue, so I might have a look at the valve just for peace of mind.

    Regards,
    Scott

    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  2. #2
    Join Date
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    I found the same issue regarding pending faults with the IID. Took me a little while to find that menu and get to the bottom of the errors. It's something I think they should make more obvious to new users. Fingers crossed your issue is resolved.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  3. #3
    Join Date
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    Location
    Central Coast NSW
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    Thanks for the heads up scott. While i dont have any turbos or intercooler hoses, the info on additional iiD settings will come in handy
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  4. #4
    Thanks Scott, just working out how to get to it and clean mine as well

  5. #5
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    Quote Originally Posted by Owen View Post
    Thanks Scott, just working out how to get to it and clean mine as well
    Ignore the title of this thread, it's all about the sticky secondary turbo isolation valve actuator.

    Sticky primary turbo actuator - external fix?

    Regards,
    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  6. #6
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    Some more info on the status bit list thanks to Justin S.

    "Pending" status bit will be set when a fault is current.
    "MIL" status bit (Malfunction Indicator Light) will be set on past events so may still be there after an ignition cycle.
    The various "Test" ones show up a huge number of faults that aren't real and take ages to finish being read.

    Cheers,
    Scott
    Quote Originally Posted by LRD414 View Post
    .... if I had activated the ďPendingĒ faults in the iiD menu it would have almost certainly matched the SDD reading ....


  7. #7
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    Quote Originally Posted by LRD414 View Post
    Interestingly these codes match exactly with what others have reported when the issue was a sticky secondary turbo isolation valve (compressor shut-off valve), resolved by freeing-up the valve actuator shaft of dirt & grime .... I know where to look and check the isolation valve thanks to an old thread from when Graeme had the issue, so I might have a look at the valve just for peace of mind.
    I did this check today and found the secondary turbo shut-off valve to be working fine and not very dirty. There's been no reoccurence of the fault so it seems that the hose must have been the cause. It was interesting to note that the shut-off valve actually operated at high engine revs when stationary. I watched it with a mirror while my wife rev'd the engine. I would have expected it to remain shut unless the engine was under load and higher revs. However, I was unable to move the actuator by hand when the engine was off but I didn't want to push too hard. Maybe people only move it by hand when the engine is running.

    Photo shows the actuator on the right and also in the mirror on the left. Vacuum chamber to the bottom but out of photo.

    Scott

    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  8. #8
    Join Date
    Jan 1970
    Location
    NSW South West Slopes
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    Your picture shows that your actuator is the later type (as expected) where the link rod is only hooked onto the pin rather than fully captured, so is unlikely to sieze.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  9. #9
    Join Date
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    Quote Originally Posted by LRD414 View Post
    Some more info on the status bit list thanks to Justin S.

    "Pending" status bit will be set when a fault is current.
    "MIL" status bit (Malfunction Indicator Light) will be set on past events so may still be there after an ignition cycle.
    The various "Test" ones show up a huge number of faults that aren't real and take ages to finish being read.

    Cheers,
    Scott
    Don't forget you need to un-tick "confirmed" before "pending" will display
    - Justin
    MY10 D4 3.0 TDV6 SE with E-Diff & LLAMS, Fyrlyt Nemesis 9000, 265/65R18 BF Goodrich KO2

    VK2HFJ

  10. #10
    Join Date
    Sep 2014
    Location
    Baldivis WA
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    771

    D4 Sticking secondary turbo actuator

    Quote Originally Posted by LRD414 View Post
    Ignore the title of this thread, it's all about the sticky secondary turbo isolation valve actuator.

    Sticky primary turbo actuator - external fix?

    Regards,
    Scott
    Just more on this issue and after reading the above thread, this seems like a likely spot. I've had several "Restricted Performance" indications, all with noticeable reduced power. Short summary is LR Dealer diagnosed faulty solenoid, replaced, fault still occurred. As of Monday this week, the Secondary Turbocharger is to be replaced in its entirety, this is a body off job and complete with all works, not much change from ~8.6K .

    Trying to get money back for the solenoid as this was clearly a band-aid fix

    Bright side is it will all be covered under the extended warranty, so I'm pretty happy .

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