C5 2008 (X7 ?) Turbo Fault

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admiral51
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Looked at lots of info and what i can gauge is that pretty much the 18 mercury is the correct setting for the actuator to hit the stop, so fingers crossed we have some good weather and i can have a play this weekend with my borrowed vacuum gauge and a mirror on a stick to see if i can find the sensor buried in the depths of the engine bay :)

Going try out my Diag on it first to see what other fault codes it shows up since it was last on a Diag lol
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Quick update, thanks to Marc i now have diagbox 7.58 installed at it all seems to be working correctly.
I have done a global test to find faults stored before i change any parts, and will try to clear the faults before i fit them ( tech help may be needed ). These are the current faults :)
Faults present : 7

P0299 : Turbo pressure electrovalve control
Characterisation : Flow too low
Status : Permanent fault
Location : local
Variables associated with the fault
Engine speed : 2570 rpm
Turbo pressure. : 1729 mBar
turbo pressure reference value : 2200 mBar
turbo electrovalve open cycle ratio : 049 %
output injected : 044 mg/stroke


P1470 : Air heater throttle position copy signal
Characterisation : butterfly jammed
Status : Permanent fault
Location : local
Variables associated with the fault
Engine speed : 0000 rpm
engine coolant temperature : 071 °C
heater throttle open cycle ratio : 0010 %
heater butterfly repeat voltage : 4098 mV
post operation engine status : start of power latch timer


P2123 : Inlet air heating motorised throttle unit
Characterisation : Short circuit to positive
Status : intermittent .
Location : local
Variables associated with the fault
Engine speed : 0000 rpm
Heater throttle setting : 0010 %
heater throttle open cycle ratio : 082 %
battery voltage : 13.45 V
Status of engine : Post-operation power latch


P1351 : Preheating relay circuit
Characterisation : Relay supplied and Plugs never supplied
Status : Permanent fault
Location : local
Variables associated with the fault
Engine speed : 0771 rpm
engine coolant temperature : 009 °C
battery voltage : 14.36 V
pre-heat relay control : unspecified value
preheating relay status : Active


P2120 : Air heater throttle position copy signal
Characterisation : opening too great
Status : intermittent .
Location : local
Variables associated with the fault
Engine speed : 2313 rpm
Heater throttle setting : 000 %
heater throttle open cycle ratio : 0010 %
output injected : 000 mg/stroke
engine coolant temperature : 074 °C


P0100 : Flowmeter signal
Characterisation : Air flow not plausible
Status : intermittent .
Location : local
Variables associated with the fault
Engine speed : 2891 rpm
air flow per cylinder : 1182 mg/stroke
EGR valve position : 027 %
output injected : 042 mg/stroke
air flow setting : 827 mg/stroke


P2032 : Catalytic converter downstream temperature signal
Characterisation : Short circuit to earth or value too low
Status : intermittent .
Location : local
Variables associated with the fault
Engine speed : 3116 rpm
catalytic converter temperature : 025 °C
Status of the regeneration : Regeneration process active
output injected : 031 mg/stroke
Status of engine : Engine operating

Thanks in advance for the replies coming my way :)
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Re: C5 2008 (X7 ?) Turbo Fault

Post by xantia_v6 »

Before you actually change anything, it might be a good idea to measure the vacuum present at the turbo actuator, as some of those faults might be consistent with a vacuum leak somewhere.
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Re: C5 2008 (X7 ?) Turbo Fault

Post by GiveMeABreak »

Yes and also seem to be related to the Air Doser. Ignore the P1351 Glow plug fault for now - that's mostly always there. I'll try and get some more info for you on those codes as soon as I can.
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Thanks for help you lot are awesome :)
Ok going to copy and paste the original fault that was recorded when Mike gave up his time to run a live Diag session on the Friday, do not think these all these faults were present but believe this one was, think results are the same.

P0299: Turbo pressure electrovalve control
Characterisation: Flow too low
Status: Permanent

Variables associated with the fault
Engine speed: 2570 rpm
Turbo pressure: 1729 mBar
Turbo pressure reference value: 2200 mBar
Turbo electrovalve open cycle ratio: 49%
Output injected: 44 mg/stroke

I do not have the right kit to test the vacuum in the way that Marc has kindly provided diagrams and values for,is it possible to do it a bit Heath Robinson, ie test the vacuum to the Turbo actuator in reverse, put a vacuum pressure gauge to the pipe that feeds the actuator and see if it holds a vacuum ?
The only parts i have that i want to replace are the Actuator itself and This One .
I can test the actuator in situ to see what Vacuum pressure is needed to get it to the stop and see if it drops vacuum so again i am in your hands here, trying my best to keep it on the road :)
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Sorry to be stupid but what the heck is Air Doser , can you point me in the direction of where and what it looks like :(
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Re: C5 2008 (X7 ?) Turbo Fault

Post by GiveMeABreak »

Here it is, item 3 on the diagram for location purposes:
Admiral Air Doser.png
Functions of the double butterfly air meter: (for your specific engine)
  • Exhaust gas recycling (EGR)
  • Help in particle filter regeneration (FAP)
  • Stopping the engine
..and in more detail:
Admiral Air Doser Circuit.png
ReferenceDesignationPart number in the electrical diagramsRemarks
gTurbocharged air (hot air)--
hOutput : Turbocharged air to the air/air heat exchanger--
jInput : Turbocharged air cooled by the air/air heat exchanger--
(24)Inlet air temperature sensor1240-
(25)Inlet air pressure sensor1312-
(26)Inlet air heater throttle (hot air meter)1361yellow
(27)"EGR" throttle (cold air meter)1362Brown
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Re: C5 2008 (X7 ?) Turbo Fault

Post by MikeT »

Congrats on installing and using diagbox successfully, Colin!

Going by the new problem you had with the car after I saw you, I was suspecting those double-butterflys might have played a part as you described the engine shuddering.
According to the detial Marc provided on the original turbo fault code, they were de-activated at the time I was looking as a downgrade mode so couldn't get any useful info on them.
They are the parts (left side of the intake plumbing) I pointed out where the other intake air temp and pressure sensors are housed. I would give them all (sensors and connectors) a good clean with contact cleaner and ensure all connections are firmly seated. You can also use diagbox actuator tests to hear if they're being activated when commanded.

Those aside, the exhaust temp sensor short to earth or value too low (25c) while regeneration was in progress is an interesting development too. Again, a good clean of the connector and firm reconnection might be all that's needed and worth doing.
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Thanks for that i can identify the part now :)
Is it possible to take off and clean the inside of it, if so what would be the best, something like break cleaner ?
i will get some contact clear for all the connectors.
Had a quick look online and the replacement would be quite expensive £200+ :(
GSF do them and with the discount it is £90 but they are out of stock :evil:

EDIT I typed Carb cleaner but came out Brake cleaner :roll:
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Re: C5 2008 (X7 ?) Turbo Fault

Post by Paul-R »

Brain fade or autocorrect in action?
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Afraid to say Brain Fade :)
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Re: C5 2008 (X7 ?) Turbo Fault

Post by admiral51 »

Right a little bit of progress i think .
Thanks to your help with the diagrams and other info i have successfully removed the Air Doser, cleaned with contact cleaner and a soft paint brush and clean cloths.
Have taken photos but struggling to get them from phone to laptop but the smaller butterfly (# 26 ) was very sticky ie did not spring back like the other one. A good clean up may have helped but also the connector when removed had oil in it, not a lot, was not dripping with it but still it should not have been there.
Now i have cleaned the sensors #24 and #25 with contact cleaner the latter actually shows metallic not black , cleaned all the contact plugs and put it back together and refitted :)
Cleared all the previous faults ( learning on the job with Diagbox ) and started the damn thing with fingers crossed.
Now it revs without hesitation even to close to red line, did not want to push my luck too far.
Still have the Service Lit up and the DPF warning but think that is maybe down to another part i have yet to replace.
I have done another Global Test and although i am unable to take the car on the road as it is has no insurance the only fault code that has shown up is P1351.
Will have to wait until next weekend to get insurance on it for a day to take for a spin and see what happens if it throws up the Turbo fault, a road test will always be best for results i think.
Also sprayed a lot of contact cleaner into the actuator base, as at some stage oil had found its way in there, cleaned up quite a lot so again work in progress.
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Re: C5 2008 (X7 ?) Turbo Fault

Post by myglaren »

Service light may go out after it has been driven a few times.
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Re: C5 2008 (X7 ?) Turbo Fault

Post by GiveMeABreak »

Exactly, as Steve says, once certain conditions are met Colin the fault may auto clear. Well done on getting this far Colin, sometimes the small simple things make a hell of a difference like a simple clean up. Good news.
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Re: C5 2008 (X7 ?) Turbo Fault

Post by MikeT »

The turbo fault will only occur under load but it sounds like it will benefit from the cleaning regardless.
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