Many thanks for your detailed reply.
The turbo actuator doesn't do a sweep. That's for certain. And as the turbo actuator unit and the two manifold actuators are the same part, I swapped all three around to see if the problem was systematic failure of one of the actuating units... but it isn't - the fault continued in the same place, regardless of which actuator was there.
Leads me to believe the computer (whichever one it may be) is shutting it down after start up on purpose...
I will of course have another play with it tomorrow!
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