Where in NZ are you?
I don’t think the BCM fault has anything to do with the transmission fault...unless the speed signal is completely missing. Anyway, most generic code readers are next to useless for diagnosing these cars.

Sett wrote: 26 Oct 2020, 14:01 Sounds like I would be up for a similar fix. What was the $$ for the repair in the end? Did you have it programmed at a dealer?

Was about $680 US for the ecu, and $290 at the local dealership for programming and fault clearing. Was quoted just under $4k to have them take care of the whole job...

On my diseasel today I replaced the timing belt, idler, and tensioner, replaced aux belt and tensioner, replaced alternator decoupler pulley, aaaand flushed the power steering.

Well folks, it’s been a while and the T5 hasn’t had much use. I have come to the conclusion that I don’t love it. Don’t get me wrong, it’s a fabulous car, but if I had to have one and one only modern Volvo in my garage it would be an 850R hands down.

The decision was made to put it up for sale. I ...

abscate wrote: 13 Nov 2019, 11:56 Its a quirk of Volvo that everything is measure in absolute pressure in software and diagnostics, isnt it?

Yes, I think mathematically it’s simpler, but not necessarily intuitive!

RickHaleParker wrote: 12 Nov 2019, 07:50

B5234T3 Maximum boost pressure: 184 ± 10 kPa @ 5100 RPM. (26.687 ± 1.450 PSI)

Is that absolute manifold pressure? It would make sense because that would equal about 12psi of boost

abscate wrote: 11 Nov 2019, 17:53 Yikes. The only thing stopping you from blowing a rod is the CBV. I hope that is working well.

Brand new, fitted recently, but you never know. Actually, maybe it’s not working, because I don’t think it’s meant to hold 20+ psi (stock part)

Today I thought, what if the wastegate initial pressure is wrong? I have quadruple checked this but it’s easy to do. It’s still set at 4.5 psi exactly. What if I do something rash, like lengthen the rod 3 full turns? Well, 3 turns takes the initial pressure to exactly zero.
Predictably that made it ...

I have done some more investigating.

I ordered a mechanical boost gauge some time ago and this morning I have fitted it (temporarily)
Idle vacuum (hot) 16in hg
Removed rubber tail from brake booster and capped hard line, idle vacuum 18in. We have a leak (booster is leaking) The joint between the ...

Well folks, it’s been a while since I’ve posted any progress so I guess it’s time for a catch up. I have a good excuse though. We’ve been very busy with garden and landscaping projects with Spring being upon us.

I took a punt on the boost pressure sensor not giving the correct information and it ...