You scanner should be able to activate the turbo control, have you tried this? what happens to turbo actuator ? Do you have good vacuume at the inlet port of solonoid valve? You are getting No boost, turbo free ? Is the pressure sensor giving true reading when boosting ?
That 1470 code puts the engine into reduced power to prevent over boost damaging engine. It can be set by under boost or over boost.
Not convinced about the scanner description of open circuit. Almost sure this code will be also set by mechanical issues with turbo vanes and control solenoid faults along with pressure loss from split pipes and leaking intercooler.
If it sets immediately you pull away it you should be able to pin it down. this code can happen very intermittently and be a pain to track down.
A few suggestions
I guess you found a thread of mine on one of these, that may help you.
Cheers Aidan
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