Powershift transmission gear change information

[rondeo]

The gearstick in the centre console is connected to the transmission by a mechanical cable.
Moving the gearstick to the Park position mechanically engages a lock pawl, as when the engine is off there is no fluid pressure to operate hydraulic shifters. The gearstick cable rotates a detent plate inside the gearbox which is what you feel when changing between P R N and D. There is a toothed wheel integral to the detent plate which rotates a wheel with magnets in it, these magnets are sensed by Hall effect devices in the transmission range sensor (TRS) which is directly connected to the TCM. The TCM controls gear selection with hydraulic mechanisms, using information from the TRS and various sensors integral to the TCM which sense shaft speeds, fork positions etc. Permanent faults in any of these sensors require replacement of the TCM, as they are hard wired to it. The TCM recieves the following information to enable it to select gears:

TRS, vehicle speed, engine RPM, both shaft speed sensors, engine torque from PCM over Can bus, brake signal, accelerator pedal position, transmission fluid temperature, engine temperature, steering wheel position to prevent upshifting while cornering.

When the manual position M is selected an electronic module associated with the gearstick, known as the gear shift module (GSM) sends driver gearstick plus and minus signals to the TCM over the CAN bus, so the driver has some limeted control over the gears.

Hope this is interesting and correct! Please let us (all) know if not.

[Binny]

Thanks for the post.
I can confirm a couple of those things from my experiences.
First the engine torque input from the PCM. When I had a chip installed for a while the transmission was acting quite differently. I presume the extra torque output from the chip was a factor. It was actually shifter up sooner and really lugging the gears from too low. For example leaving up my street up the hill it would shift too soon into 3rd and then be off boost, shudder and change back down to 2nd again. It always behaved much better and shifted smoother when I took the chip back off. I had it on and off a couple of times.
Second is the steering wheel position. I find that feature really annoying. Sometimes when you are turning through an intersection even accelerating gently it will hold second the whole way through until you straighten the wheel. Even then there is a delay before it decides to shift up. This and the shocking lag from walking pace are my two main complaints about this transmission. Otherwise I think it works very well and is the best auto I have had. I still wish it was manual though ;)

[NZ XR6]

Originally Posted by Binny

I still wish it was manual though ;)

Totally agree. Not many Mondeo buyers would want a manual, but surely there would enough of us to make it worthwhile. I'd even pay the auto price!

[rondeo]

Finally managed to re-locate some information on the 6DCT450. I was unable to copy any link that worked, so suggest the following to download a 36 page pdf with lots of info including fluid change:

1. Go to Google images
2. Search '6dct450 transmission manual'
3. Mouse over image of mechatronics unit with circled numbers from 1 to 8,
4th image on my search.
4. Should see ddl2.data.hu, that's where the pdf is.

[Mondaveo]

This should do it:
http://ddl2.data.hu/get/0/7459943/powershift.pdf

I'm really impressed with all this info you've been able to dig up, thanks so much for sharing!

The steering angle thing is interesting to me, I had wondered if it had something like that going on. As I mentioned in the other thread my car is tending to grab neutral and lurch between 1st and 2nd, well it invariably does it when I'm turning through intersections...

[rondeo]

http://ddl2.data.hu/get/0/7459943/powershift.pdf

This link no longer works for me. so maybe the pdf could be put on this forum somehow, as it it quite rare and 'valuable'

[V8kado]

Nope here too, great resource for someone to post up somehow if they saved it previously?.

[rondeo]

A short animation:

https://www.youtube.com/watch?v=3dqvjsUAfG4

[bundybear75]

Originally Posted by V8kado

Nope here too, great resource for someone to post up somehow if they saved it previously?.

I found that powershift pdf in my downloads folder but is too large to upload.

Any one got any ideas how I can share it?

[NZ XR6]

One of the reasons I still have my 5-year old MB is I really don't know if I want a Powershift 'box. Might wait a year or 2 to see how well the MD behaves.

[cobrin]

Originally Posted by bundybear75

I found that powershift pdf in my downloads folder but is too large to upload.

Any one got any ideas how I can share it?

google drive onedrive or tinyupload.com

[rondeo]

Copyright?

For those interested in gory details:

https://www.youtube.com/watch?v=6iCR...I&spfreload=10

cheers

[Mondaveo]

Originally Posted by rondeo

For those interested in gory details:

https://www.youtube.com/watch?v=6iCR...I&spfreload=10

Watch out if this guy ever offers you a muffin ;)

Cool vid, neat to see all the parts and how it works together.

I guess it really doesn't look user-serviceable huh...

[rondeo]

If by servicing one means routine maintenance, yes it's quite possible. The biggest problem is getting the car far enough off the ground and level at the same time. All the required information is available in this forum under DIY transmission fluid change.

This video shows the procedure:

https://vimeopro.com/completemedia/v...video/29488374

The gearbox is the same.

[Mondaveo]

Originally Posted by rondeo

If by servicing one means routine maintenance, yes it's quite possible. ...All the required information is available in this forum under DIY transmission fluid change.

Thanks. I was thinking more of flights of fancy such as undertaking one's own repairs and replacing components (vis: input speed sensor). It's obvious you'd be nowhere without the specialised tools to take it apart and more importantly put it all back together.