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Lack of power at low revs.
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
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Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

No, apart from metered air which at idle should be around 16.0 g/s at idle.
At 2500 rpm it should be 77.0 g/s, 56 g/s at 2000 rpm, and 40 g/s at 1590 rpm
(g/s = grammes per second)
Manifold pressure at idle should be around 100 kPa.
Boost pressure adjustment 86% at idle dropping to around 34%ish on hard acceleration to 3000rpm

You could use a multimeter to see what signal values are present at the MAF with the ignition on or engine running.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #222946411th May 2021 12:07 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

Thanks have just found a link for the signal values, so will check those too.
  
Post #222946511th May 2021 12:25 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

These are the engine fault codes recorded today: -

Engine TDV6

P023D-22 (68) Manifold absolute pressure - turbocharger/supercharger boost sensor A correlation - General signal failure - signal amplitude>maximum
P0113-17 (2C) Intake air temperature sensor 1 - circuit high input - General electrical failure - circuit voltage above threshold

So same ones again.

I took some readings on the four MAF wires as follows: -

Red/Blue - 12v with engine off, 14.4v at idle.

Red/Grey? - 5.03v with engine off, 4.07 at idle.

Yellow/White - 5.03v with engine off, 3.02v at idle.

In addition I obtained this information using the IID tool: -










All were with the vehicle stationary. Should I do the same under load?
  
Post #222962612th May 2021 12:45 am
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4570

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Yes, the last one needs to be under load, the others look OK and there is nothing jumping out from your DMM tests. Except for this dtc, P0113-17 (2C). Isn't that new? The intake air temp sensor is in the MAF meter itself but that's new right?

When you do the load test include the battery voltage to see if there's anything funny going on with voltage fluctuation! Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #222962812th May 2021 1:14 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

You're absolutely right. I saw the -17 at the end and thought it was the same one again. Yes, the MAF was new only a couple of months ago.

Will do the load test and report back.
  
Post #222979212th May 2021 7:12 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

Here are some live values under load in 6th gear.







  
Post #223018614th May 2021 10:04 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4570

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

I can't see much wrong there tbh, was the fault triggered?
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #223018814th May 2021 11:05 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

No it wasn't this time. No engine codes after a 30 mile round trip but still down on power at low revs..
  
Post #223019014th May 2021 11:56 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4570

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Plug in the iid and set up a log, but include a few other sensors such as MAP.
Leave it plugged in and keep logging until the fault reoccurs. Unplug it overnight though.

See what that brings Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #223019315th May 2021 12:22 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

Ok. Will have to try and get organised with that. It doesn't get used everyday, so will need to remember to plug it in. Did a 50 mile round trip today and completely forgot!

What are the best 4 things to log? MAP, MAF Revs and boost pressure actuator?
  
Post #223073817th May 2021 6:00 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4570

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

There's an extension available for the OBD port which you can route up to the dash and keep the tool in your line of sight!

I think there's even a switched one available which allows you to keep it plugged in but powered on or off as required.

Might be useful, but best not to leave it exposed to prying eyes when unattended!
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #223074217th May 2021 6:09 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

I've already bought a 90 degree extension lead off Amazon, as the tool gets in the way of my size 13s when I am driving.
  
Post #223082417th May 2021 11:41 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4570

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Laughing tell me about it.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #223082518th May 2021 12:07 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

I never did get round to setting up the log but

P023D-22 (6C) Manifold absolute pressure - turbocharger/supercharger boost sensor A correlation - General signal failure - signal amplitude>maximum

returned again earlier this week.
  
Post #223302528th May 2021 11:29 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4570

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

So it's the same story really, either overboost (sticky actuator) or a air /pressure leak somewhere.

Logging might be your only way since you have tried everything else. Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #223302629th May 2021 12:03 am
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