Start cheap...
Remove the sensor on the SIDE of the airbox. Blow it off with compressed air and maybe some electronics cleaner. Inspect the electrical connector for damage, bent pins, etc. Let the sensor dry and reinstall it firmly.
Fully remove and inspect each intake related hose, airbox-to-turbo, turbo-to-IC, IC-to-intake. Clean and reinstall AFTER the next step. Replace any that have issues.
While the airbox hose is off, reach into the turbo inlet and wiggle the turbine shaft. It shouldn't move much side to side, no more than about 1/64".
Check the entire vacuum hose leading to the turbo actuator for potential leaks. Any rub marks, cuts or holes are a problem. If you find any problems, replace the hose.
Remove the small air filter from the bottom of the solenoid on the passenger side and make sure you can blow through it. Replace it if you cant.
If everything checks out there, then move on to these...
Start the motor and listen to the solenoids. They should not be buzzing or making any discernible noise. Replace them if they are.
Pop the vacuum hose off the turbo actuator and watch the rod going to the turbo. It should move about 1/2" in a fairly quick manner. If it doesn't move very far or moves slowly, your vanes are stuck. You may have to rent or borrow a vacuum pump to work the turbo vanes back and forth and free them up. Some spirited driving after loosening them should help free them up more.
If nothing changes after doing all that, post back here and we'll move on to the next thing!
_________________ 2006 Limited CRD: Frankenlift II, Fumoto Drain Plug, DIY Stage 1 Tune, In-Tank Lift Pump
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