Bought a used DSG transmission and it doesn’t work?

[Joel Shack]

I am relatively new to working on these cars and I got a used dsg and I can spin the axle shaft with my hand in every gear and my input shaft doesn’t spin but on my old one I can do it in drive neutral and reverse just want to make sure I didn’t get screwed when I bought this transmission any help is appreciated!

 

[JELLOWSUBMARINE]

If I understand your description, that would explain a limited slip differental operation

 

[Joel Shack]

Is it normal to spin it by hand in park?

 

[JELLOWSUBMARINE]

The input would be locked in park along with the axle not being able to turn or at least having heavy resistance if its a limited slip. If its a non limited slip, in park the input will be locked and the axle can be turned while the opposing axle turning the opposite way.

 

[Joel Shack]

Okay I’ll assume it’s a limited slip because it has a lot of resistance in park

 

[JETaah]

The input would be locked in park along with the axle not being able to turn or at least having heavy resistance if its a limited slip. If its a non limited slip, in park the input will be locked and the axle can be turned while the opposing axle turning the opposite way.

If the input shaft is locked in park how is it that you can start the car in park?
The input shaft is tied to the engine and the parking pawl is is engaged somewhere near the ring gear if I'm not mistaken.
No gear, (forward or reverse), is engaged until the input shaft is spinning and the transmission pump hydraulically moves the shift forks to engage them.

 

[JETaah]

With a DSG transmission I believe that you must go through the basic settings process using VCDS or the like before you can expect things to be normal.
That's not to say that the trans you bought isn't on the fritz.

 

[JELLOWSUBMARINE]

The torque converter is basically the coupling that alows the engine to turn while park locking the drive train further down. I cant speak to the trans axle exacts though.

 

[oilhammer]

The DSG has no torque converter.

The DSG's gear selector is JUST in the car, the lever on the transmission JUST engages the park lock. It has no other function. There is no manual valve lever or anything of that sort inside the DSG transmission, like a conventional automatic transmission. You cannot "move it from Park and Drive and Reverse" as there is no physical connection to do so.

 

[lemoncurd]

You cannot "move it from Park and Drive and Reverse"

there is a mechanical linkage for the parking pawl is there not?

i agree for the drive and reverse. those are dictated by solenoid's controlled by the computer. but there is no solenoid or digital control mechanism for the parking pawl. this is observed in the SSP's aswell.
(this is why there is a little pull string thing under the shifter to pop the transmission out of park should you need to roll it!)

maybe the newer DSG's have digital parking pawl engagement, but the dq200, dq250, and dq500 certainly do not. i imagine "older" dq381's from the likes of mk7-mk7.5 VW's are also mechanical. this would leave the newest dq381's used in MQBevo as possibily using a digital control for park

edit: yep, you know this. found this while searching "DSG parking pawl" on google

The cable on the 02E is JUST for the park lock. That's it. It does nothing else. All the gear range sensing is done at the shifter module inside the car. You could literally take the cable out of the car and throw it in the trash, and still operate the car every day perfectly fine (assuming of course the park lock was manually disengaged at the transmission lever first).

 

[oilhammer]

Yes, that's what I meant... it just engages the park lock. Sorry if I wasn't clear.

(and thanks for linking a statement that I made to clarify.... LOL!)

 

[JETaah]

Not good news for BRM DSG owners.
I called the VW dealer this morning and mechatronic units are NLA for this car. Not new, not rebuilt.

 

[oilhammer]

Yep, found that out about 5 years ago. I got the last whole DSG unit, too.

 

[JETaah]

I bought one (mech) from a VW dealer about a year and a half ago. Must have been one that was sitting around somewhere.