Engine: D5244: Ecm 6805 and boost related issues

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there seems to be a lot of the above rearing its ugly head so i have put together a list of what may be the culprit and a what to check and how to check..
first picture tells you what the code is with an explanation.
things to check are.
INTERCOOLER.
check the tell tale sign by looking under the front bumper you will see oil deposits and also by looking down in the engine bay between the engine and the cooling fan at the bottom, if you still suspect the INTERCOOLER you can have it presure tested insitu.
ENGINE MOUNTS.
front and rear. these receive vac at idle, over 1500rpm the are deactivated.to check these to see if they are leaking block them off and take it for a spin if you still get any issues then its not them.
VNT.
the vnt is activated by vac. to test to ensure the vacuum regulator and lever are working as it should you will need a MITTY VAC,
http://www.uktools.com/mityvac-auto-...2bcc01cbdb1ef7
this is better to get to from under the car on ramps, connect the mitty vac to the regulator in line and create a vacuum the arm should move freely until it stops if it does not there is too much carbon build up on the veins have a look here.
http://www.youtube.com/watch?v=UWyN5...eature=related.
if it is not smooth use the mitty vac to try and free it.carbon build up is the main culprit, italian tune up comes to mind.
TCV
turbo control valve, this is just to activate the engine pads, there is a direct feed from the vac pump to the TCV and then to the engine pads. to check if this is working if you have the volvo diagnostic kit there is a test you can do on there failing that you can hook a vac gauge in line one of these.
http://www.amazon.co.uk/Vacuum-Fuel-...4193334&sr=8-9.
at tickover it should read about 5 hg rev it past 1500rpm and the needle should not move on the gauge. the line in to the TCV from the vac pump should be approx 45 hg at 2500rpm.
TCG.
turbo control governor which is bolted to the engine see this post for identification.
http://www.volvoforums.org.uk/showthread.php?t=122032.
to test this connect vac gauge to out port on TCG in line and the reading should be approx at idle 5hg at 2000 rpm 43hg at 2500 rpm it drops down to 35 hg. there is also a test on vida to check that the VNT is working picture 2.
SOFT CHARGE AIR HOSE.
this is the hose that connects to the turbo check this post.
http://www.volvoforums.org.uk/showth...air+inlet+hose.
when it get old and goes soft excuse the pun it will under load squash and will restrict the air flow to the turbo. also check all other intake hoses.
INJECTOR TEST.
to ensure that you have no issues with the injectors have a leak of test done.
VAC PUMP.
this is situated at the side of the fuel injection pump, this provides vacuum to the TCV and the TCG, connect a vac gauge in line and the reading should be approx at 2500 rpm 45 hg.
FUEL FILTER.
change it
the above hg figures where taken from my car today and as far as i am aware i have no boost issues.
i hope that the above info will point you in the right direction of what to check and the possible fixes,ECM6805 is time consuming and if put into a garage could be expensive to rectify.good luck on your quest and hope that the above will help you .
thanks to all that have posted in the links that i have provided.
mike