The ESS or Eccentric Shaft Sensor tells the DME what the Eccentric Shaft Position is, and the Accelerator Pedal Module tells the DME what the "Target" position is (in simplified terms). The "Polarity" of the current flowing through the motor is "reversed" or switched to cause the motor to turn the "Screw-Shaft" in either direction, to open or close the Intake Valve "Lift".
The key to understanding the simple procedure is realizing that the Electric Servomotor is a "normal" reversible DC (Direct Current) Motor.
You can download the Bentley Manual pdf at the 1st link below, and get paper manual at 2nd link & similar parts houses:Ģ) I will attach FOUR (4) ScreenPrints of the ISTA procedure to the NEXT Post, so as NOT to ruin margins here. It's NOT brain surgery, but following a WRITTEN checklist (like pre-flight checklist, or surgery sponge count) is preferable to watching a video.ġ) Bentley procedure is found at Pages 130-17 & 130-18. BOTH rely on proper hand-tools, namely small hexbit or Allen wrench, in 4mm to 6 mm range. There are TWO reliable procedures for removing the VVT Servomotor WITHOUT breaking something. It isn't complicated at all and nothing will spring out as long as you follow the instructions. Installation is reverse of removal, very easy. Don't forget to have the ignition wire harness/guide removed so there's clearance for the valvetronic motor to come straight out. Then when the Valveteonic motor bolts are removed rotate counterclockwise some more and the motor will start to back out. Rotate the motor counterclockwise until you feel it stop, using an Allen wrench (5mm I think) inserted in the back. Follow the pelican parts guide or all the instructions here. I've never put it in service position with INPA.
Where do I go in either software to do this? I've searched around and haven't found any information on this. My understanding is that the valvetronic motor which has to be removed is under tension and will spring out when pulled out but can be avoided by setting it in a service position first using INPA or ISTA. I'm going to replace the eccentric shaft sensor on 2006 330i E90 soon and am researching some details.
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