The three pipes are Vent, Turbo Actuator, Vacuum pump. (Your loose pipe is the vent, as you say.) The Actuator can be connected to either Vent or Pump, depending whether the valve is energised or not. I think vacuum puts the turbo into low / no boost condition, and then allowing air in via the vent puts it into boost condition.
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ford focus 1.0 ecoboost turbo problems
