S80: Engine Turbo Boost Pressure Solenoid 31293964

[TheBeast]

Hi, does anyone happen to know what the resistance reading should be on a Turbo Boost Pressure Solenoid 31293964 please or where I can find this information?

Currently going through a fault-finding session and trying to rule things out.

Mine is reading 11ohm. Saw a video where 30ohms was mentioned...

Thanks

[100K+]

The above part number comes up as a two port "switch/gate" ( I use this term because "turbo boost solenoid " means different parts to different people with different cars)
I can't help with the ohms reading (but IIRC it is low), however Si Robb on his Utube channel until recently, had two videos about cleaning /stripping the valve inside the part down and cleaning it. ( crud makes it stick/ not move smoothly) I have the occasional over-boost issue which I place at this parts door. My 2015MY is a twin turbo D5 and IIUC this part opens a gate to move boost air to the 2nd (larger) turbo at about 2000RPM. As I rarely exceed 2000RPM I live with the occasional problem, which is why I probably got the problem in the first place LOL.
Hope this helps.
Cheers Bob.

[TheBeast]

Thanks for your reply Bob.

Originally Posted by 100K+

The above part number comes up as a two port "switch/gate" ( I use this term because "turbo boost solenoid " means different parts to different people with different cars)

You are right regarding the different names used. I believe Volvo call it a 'Governor' (see picture attached).

Originally Posted by 100K+

I can't help with the ohms reading (but IIRC it is low), however Si Robb on his Utube channel until recently, had two videos about cleaning /stripping the valve inside the part down and cleaning it. ( crud makes it stick/ not move smoothly)

Had seen that videos too, but mine is slightly different and there is no easy way to dismantle it. I could attack it with a screwdriver in an attempt to take the plastic cover off (bottom right bit on the picture) but with my luck I'll probably snap something off.

Hopefully somebody here has an idea regarding the required ohms..?

What is more indicative of the thing perhaps not functioning properly is that when I gently blow on one of the ends, air comes out of the other. My understanding is (quite possibly wrong ) that it should not let air through when there is no charge on it, and open when under charge.
Thoughts anyone please?

Originally Posted by 100K+

I have the occasional over-boost issue which I place at this parts door. My 2015MY is a twin turbo D5 and IIUC this part opens a gate to move boost air to the 2nd (larger) turbo at about 2000RPM. As I rarely exceed 2000RPM I live with the occasional problem, which is why I probably got the problem in the first place LOL.
Hope this helps.
Cheers Bob.

The joys of low revs cruising!


I'm actually investigating the reverse. I'm getting an underboost...

Following 2 codes:

ECM-P029900 Turbocharger/Supercharger A Underboost Condition
ECM-P003A85 Turbocharger/Supercharger Boost Control A Position Exceeded Learning Limit - Bus Signal / Message Failures - Signal above allowable range.

Have done smoke tests on any hose I could get my fingers on and couldn't find a leak.

Had a look at all the possible parameters within VIDA and all seem to be reporting sensible data.

Not got to the turbo/VNT actuator itself yet, as the weather here has been pretty bad and I have to work outside.

Tempted to run an 'Adaptation turbo system' but not sure if this could do more harm than good. If there is a mechanical fault somewhere, the ECM might 're-learns' the wrong thing...
Thoughts?

[100K+]

Originally Posted by TheBeast

Thanks for your reply Bob.



You are right regarding the different names used. I believe Volvo call it a 'Governor' (see picture attached).



Had seen that videos too, but mine is slightly different and there is no easy way to dismantle it. I could attack it with a screwdriver in an attempt to take the plastic cover off (bottom right bit on the picture) but with my luck I'll probably snap something off.

Hopefully somebody here has an idea regarding the required ohms..?

What is more indicative of the thing perhaps not functioning properly is that when I gently blow on one of the ends, air comes out of the other. My understanding is (quite possibly wrong ) that it should not let air through when there is no charge on it, and open when under charge.
Thoughts anyone please?



The joys of low revs cruising!


I'm actually investigating the reverse. I'm getting an underboost...

Following 2 codes:

ECM-P029900 Turbocharger/Supercharger A Underboost Condition
ECM-P003A85 Turbocharger/Supercharger Boost Control A Position Exceeded Learning Limit - Bus Signal / Message Failures - Signal above allowable range.

Have done smoke tests on any hose I could get my fingers on and couldn't find a leak.

Had a look at all the possible parameters within VIDA and all seem to be reporting sensible data.

Not got to the turbo/VNT actuator itself yet, as the weather here has been pretty bad and I have to work outside.

Tempted to run an 'Adaptation turbo system' but not sure if this could do more harm than good. If there is a mechanical fault somewhere, the ECM might 're-learns' the wrong thing...
Thoughts?

) What year/model is your car? Si Robbs video is for single turbo not Bi turbo so the use of these components may be different even though they are the same item. However as we appear to be on the "same page" I'm assuming its a 2 turbo engine. As you have Vida do you have dice too? There is an activation sequence somewhere which "tests" the 2 gate ( which should Vibrate when activated) and the 3 gate components, which just clicks. According so the Si video the piece you refer to is held with 4 tags/Clips which have to be released. The internal mechanism is released via the housing at the top RHS of the image, But it appears to be a plastic ring holding the bits rather than a crimped metal fastener.
I understand your pain about smashing stuff with hands of clay - that's why I ain't moved with my issue.

If you have a "Mitty" vac or equal you can test both actuators for operation, but that means removing x2 pipes ( one one *3964 and one (the "T" one IIRC) which runs down to the larger turbo waste gate. on the component next door( two actuators fastened on one bracket???)

Finally IIRC the default position for the valve is "open" in as much as when Si in one video squirted cleaning solution into one of the two "gates" the dirty solution came out of the 2nd gate - This is what you have- but it could be stuck in this position and in need of a clean...

Cheers
Bob

[TheBeast]

Thanks Bob, your insights are greatly appreciated.

Originally Posted by 100K+

) What year/model is your car? Si Robbs video is for single turbo not Bi turbo so the use of these components may be different even though they are the same item. However as we appear to be on the "same page" I'm assuming its a 2 turbo engine. As you have Vida do you have dice too? There is an activation sequence somewhere which "tests" the 2 gate ( which should Vibrate when activated) and the 3 gate components, which just clicks.

It is an S80 D3 Automatic, Engine: D5204T3, year: 2012
(chassis No: 152371)

I do have a Dice too and just enough knowledge to be dangerous...
Attached the options I have. I'll have a little prod.

Also a screenshot on the turbo.
I see VIDA comes up with multiple options for my D5204T3 though (36001168, 36001767).

Originally Posted by 100K+

According so the Si video the piece you refer to is held with 4 tags/Clips which have to be released.
The internal mechanism is released via the housing at the top RHS of the image, But it appears to be a plastic ring holding the bits rather than a crimped metal fastener.
I understand your pain about smashing stuff with hands of clay - that's why I ain't moved with my issue.

Mine is somewhat different unfortunately and does not have those tags/clips.
Also, mine doesn't have that metal fastener; it is plastic parts pushed together to make it not accessible.

Originally Posted by 100K+

If you have a "Mitty" vac or equal you can test both actuators for operation, but that means removing x2 pipes ( one one *3964 and one (the "T" one IIRC) which runs down to the larger turbo waste gate. on the component next door( two actuators fastened on one bracket???)

Might try that next, to see if that shows something obvious. Is easier than trying to get to the turbo itself (which I might end up having to do eventually anyway) as that is pretty hard with the limited space between the turbo itself and the bulkhead.

Originally Posted by 100K+

Finally IIRC the default position for the valve is "open" in as much as when Si in one video squirted cleaning solution into one of the two "gates" the dirty solution came out of the 2nd gate - This is what you have- but it could be stuck in this position and in need of a clean...

Cheers
Bob

A, OK, I thought default was closed. Could be, like you said, that it is simply stuck in position.

Thanks and I'll see what else I can find

[100K+]

Ok Your engine is only single turbo and suspect *3964 may be used in a different way on my engine than yours, but the method of operation should be the same across all engines.
I'd try to flush it - see what if anything comes out.
Try to get Vida to operate it.
After that other than trying a replacement I'm a bit stuck.
If you did get an ebay special, you could play with that trying to take it apart - if it gets broke its not a total loss, you still have the original, If you do get in and clean it etc thats a win win.


Perhaps others might offer a fresh insite..

Cheers
Bob