(09-01-2009, 09:01 AM)winmutt VTG or VNT? What model is this for? John what PDF is that from?
The PDF was made from the W211 DVD service manual (the ETM part to be specific). The DVD has some copy protection stuff going on, so you have to print the current schematic to a "PDF printer" (PDF Creator) onto *huge* page size. Then you can crop it down to something reasonable.
The schematic is for the GT23 on my '05 CDI. It just so happens that it uses the same Hella actuator as the GT20 I have from a 2007 Sprinter. I think all the Hella actuators are the same, and can be controlled this way. I used a portable oscilloscope from work to get the PWM frequency, and applied that same signal to the GT20 on the bench, and it works flawlessly.
I might have a chance to verify the frequency today. Time will tell!
John Robbins
'05 E320 CDI - 118k -
Faaaaaast!!
'87 300TD - 317k - Cracked head... but an
OM606 is on the way!
'79 300SD - 295k - Bad engine = project car!