How do you test a Turbo Control Valve (TCV) out of car

[YM05]

Yes mate... I think I should start this as a new thread (?) as I've moved onto ECU and removed it to look inside and check for corrosion and water ingress

[138gat]

Be interesting to know how you get on as i have a similar problem, Don't think it's the TCV's (only 2 on a 2.0D ) as I can hear the turbo spooling but just not getting full boost. oh and i've no dpf

[YM05]

I'm still trying to trace this fault. My car is stuck on the drive and has been for 4 weeks now. It drives but with a very rich mixture , smoke and no boost.

(this other thread details more about electrical fault hunt... https://www.volvoforums.org.uk/showthread.php?t=272294 )

Ive checked the 5v supplies from the ECU and they are all OK on a multimeter. Good continuity and no resistance from ECU connector to sensors that I can reach to test.

In case the electrical fault is a red herring, I did a boost leak test and its air tight. I'm going to check the TCV activity on VIDA tomorrow. As the ECU is asking for boost as seen on VIDA during a drive, but its not being delivered. Also going to check the turbo actuator sensor and vane movement.

If none of these show a solution I'm stumped 100%.

I have a very clean, inside and out, 2005 V50 2.0D Sport with only 72k on the clock, a full MDSH and its going to have to be sold as a fixer or to a breaker.

[c30volvodave]

Hi all
I have just joined and i apologise in advance if this has been explained but i could not find the answer.
I have a C30 with a D3 engine and i have noticed that it does not pull as well as it used to.
I have physically checked the turbo and it is spinning freely and bearings feel fine. i have checked the actuator with a hand vac pump and it holds a vacuum and moves as i would expect.
however i have noticed that it has vacuum at idle and through the rev range i have put a vac gauge on the vac line to the actuator and it has vacuum at idle and increases when the engine revs increase.
I saw a video on how to test and it shows that at ~1000rpm it should not have vac at all.
i have checked the supply voltage to the TCV and it changes state from ~5v at idle to ~1v at 2000rpm.
so im thinking that the TCV is not switching correctly, causing the waste gate to be open all the time so loosing boost? not sure if that is how this works?
I would be grateful for input on this before i spend £120 replacing it.
many thanks for your time
Dave