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tallhighlander
Member Since: 13 Dec 2015
Location: Highlands
Posts: 24
  
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Had my D4 show "Restricted performance" gizmo; so bought a diagnostic tool, plugged her in and Ive got this:
1. Manifold absolute pressure - mass or volume air flow correlation
2. Mass or volume air flow A circuit range/performance - Airflow too high
3. Turbo boost pressure low
4. Turbo/supercharger boost sensor A circuit
5. Fan 1 control circuit
Now what I want to know is: what does this tell me?
And b): can I erase these/is this advisable?
Much obliged 3 x TD5s + 2 x D3s; now upgraded to a D4 after a 3 month flirt with a VW Toerag...
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 29th Jul 2022 3:10 pm |
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Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20841
 
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Favourite culprit is a seized TSOV, at the bottom of the rad pack.
Pivot seizes up, and causes those codes
If that is OK, then we're looking at a boost leak someplace
If the smoke test comes back OK, we're then into in depth diag/live data etc
 My D3 Build Thread
TDV8 Retrofit Build Thread
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| 29th Jul 2022 3:36 pm |
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tallhighlander
Member Since: 13 Dec 2015
Location: Highlands
Posts: 24
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Thanks for that. Forgive my ignorance, but what is a TSOV? 3 x TD5s + 2 x D3s; now upgraded to a D4 after a 3 month flirt with a VW Toerag...
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| 30th Jul 2022 7:09 am |
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Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6308
 
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Quote:Thanks for that. Forgive my ignorance, but what is a TSOV?
Turbo Shot Off Valve.
Flack
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| 30th Jul 2022 7:28 am |
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tallhighlander
Member Since: 13 Dec 2015
Location: Highlands
Posts: 24
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Thank you sir 3 x TD5s + 2 x D3s; now upgraded to a D4 after a 3 month flirt with a VW Toerag...
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| 31st Jul 2022 12:33 pm |
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RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1729
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depending on how close you are to Dundee why not drop into Disco Mikeys garage, Ive heard hes rather good at working on Land Rovers  2011 D4 XS 305 MY12 - gone but not forgotten
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| 1st Aug 2022 6:56 am |
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tallhighlander
Member Since: 13 Dec 2015
Location: Highlands
Posts: 24
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Dundee is 4 hours south!
But thank you for suggestion 3 x TD5s + 2 x D3s; now upgraded to a D4 after a 3 month flirt with a VW Toerag...
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| 1st Aug 2022 6:59 am |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13018
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tallhighlander wrote:Dundee is 4 hours south!
But thank you for suggestion
Probably longer in "reduced performance" mode 
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| 1st Aug 2022 12:27 pm |
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mjt989
Member Since: 06 Oct 2023
Location: Oxfordshire
Posts: 5
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Hi guys, any tips on how to free up a sticky TSOV (first time LR owner here), I’ve got DTCs which I think point to the TSOV:
P004B-77 Turbocharger boost control solenoid B - circuit range/performance
P259B-71 Turbocharger boost control position sensor B performance - stuck high
Thank you!
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| 21st Oct 2023 8:33 am |
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