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Valvetronic Drivers

Ronald Technical Support Specialist British Columbia Posted Latest

Question

Resolved

Driveability

Electrical

2012 BMW X1 xDrive28i 2.0L (N20B20A) 8-spd (GA8HP45Z)

Starts But Only Idles Rough

This vehicle was sent to me from another shop. They replaced the valvetronic motor due to crank no start and codes 2DD8 2DD6 2DCF 2775. After replacement they could not get system to teach in. They thought their scan tool was not capable and sent to me.

I updated DME and attempted to start up Valvetronic system. The vehicle now has codes 2DCE 2D43 and 2D41.

I believe the valvetronic is not moving as it should be. I am going to go in and check the eccentric shafts for binding but I am not sure if the drivers for the valvetronic motor are good. I am attaching a waveform for KOEO showing the currrent flow through one phase and the voltage on the three phases. The peak to peak current is lower than a specification I was given.

Does anyone know if the attached pattern is good or not?

Thanks

Interesting

Sisco Owner/Technician

Vermont

Sisco

Snapshot will not open, but if you are getting “no adjustment possible” and powers/ground/continuity of cable between positioner motor and DME checks out, then the drivers are fried and will need DME. Not too sure if anyone is repairing the drivers.

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Michael Technician

Indiana

Michael

Sisco, If you download the free picoscope automotive scope software, when you click his link it will open it right up for you. It's free, just run in demo mode to view files.

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Sisco Owner/Technician

Vermont

Sisco

Will do, thx!

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Ronald Technical Support Specialist

British Columbia

Ronald

Sisco Sorry the file attached is a picoscope data file. I will attach a picture. Three channels are voltages for each winding and the current flow is one winding. The peak to peak current is -10 to 10 amps or 20 amps. All the windings are similar.

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William Diagnostician

Texas

William

What tool are you using for relearn ? Just did eccentric shaft and motor last week on an N55 and Autologic would not complete relearn but ISTA did without issue.

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Ronald Technical Support Specialist

British Columbia

Ronald

I used ISTA. Shop that replaced motor did not replace eccentric shaft.

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Boyd Technical Support Specialist

Georgia

Boyd

If the motor was shorted there is a good chance that the Drivers have been damaged. I am mobile and can't view the file so if the others confirm the DME is not at issue try Ista or the ISCAN 3. Both are reliable for this function.

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Gerald Manager

Alabama

Gerald

I also recently replaced a shaft and motor and it would not adjust with autologic. I ran ISTA and it cleared control unit memory for valvetronic and it adjusted no problem from there.

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Ronald Technical Support Specialist

British Columbia

Ronald Update

I have scoped the hall effect position sensors and they do show movement each time the key is cycled. After clearing all codes and performing valvetronic start up again the start up process stops because code 2D41 sets. Autel definition is “Valvetronic adjustment range: master adaptation out of tolerances”.

Update Ð Awarded

Gerald Manager

Alabama

Gerald

The shafts wear at the point the motor meets the shaft. The motor and shaft has to be replaced to repair the car. BMW didn't get the shafts hardness right on some of the shafts and they are wear. It's a problem with the motor to the shaft clearance.

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Helpful

Ronald Technical Support Specialist

British Columbia

Ronald Delay

Going to take valve cover off and take a look inside to see what is happening. Super busy at the shop but will get to it soon.

Delay Ð Awarded

Ronald Technical Support Specialist

British Columbia

Ronald Update

Got the valve cover off to take a look at what happens KOEO. Servomotor buzzes essentially and does not move the shaft at all. Shaft just sort of vibrates in place. I removed the servomotor and moved the eccentric shaft and it feels like it moves smoothly between full open and full closed. After reinstallation I put the shaft at full open and ran the start up function with ISTA. The shaft moved…

Update Ð Awarded

Ronald Technical Support Specialist

British Columbia

Ronald Resolution

Finally got this one finished. Drivers in ECU were bad. Found used ECU. Not a numbers matching ECU but one from same vehicle. Cloned the ECU and installed. These are the waveforms from the valvetronic learning process which sucessfully completed and the vehicle runs good. diag.net/file/f5t336umg… diag.net/file/f359iml4o… Thank you for all the assistance.

Resolution Ð Awarded