Date registered: May 2007
Vehicle: 2003 Mercedes Benz E500
Location: San Francisco Bay Area
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Quoted: 1 Post(s)
That is a tough call...
as there are no "for sures" in this "chicken and egg situation". The car is not likely to throw codes if not running, and to get the car running you may need to replace the part.
When both of my throttle actuators failed, the car in question would start, but they were thrown into "limp mode" when certain operating parameters were met. [Usually speed related, as this system unit interfaces with the ASR]
Your best bet, I believe, is to try to get a good used actuator unit and give it a go; or, put the hands of a good independent tech who can further trouble shoot the situation. Acquiring a spare actuator is not a bad thing, if you plan on keeping the car, as sooner or later, the installed unit WILL fail.