Actuator check out

You need a multimeter, a 12 V drill battery, and some clip leads.
Feedback pot:
- Check pins 1-3, should have about 3.5 k ohms (3500 ohms) always
- Check pins 1-2, should go from 3.5 k ohms to zero as you rotate the shaft
- Check pins 2-3, should go from zero to 3.5 k ohms as you rotate the shaft
I cannot remember which way is which, but it should go one way from 1-2 and the other way from 2-3.
Motor:
Check pins 4-5, should have a few ohms resistance
Jump drill battery power to pins 4-5, the motor should whir. Put your meter on amps, in series with the battery and the motor, make sure you are under 200 mA (or 0.2 A).
Solenoid:
Check pins 6-7, should have a few ohms
Jump battery power to pins 6-7, you should hear solenoid click.
Do not jump 4-5 and 6-7 to power at the same time or you will damage the gear train

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech