E86

2006 Cayenne S 84k miles

Original symptoms: rough upshifts, rough downshifts. The most annoying problem is 'Jerky' downshifts while coasting to a stop, at slow speeds while coasting downshifts from 4-3, and 3-2 are rough, they jerk the car and usually result in a 'clanking' noise from somewhere in the drivetrain. Pretty sure I can feel the converter lock and unlock 50% of time.

After reading about common problems with the valve body, I decided to order a replacement unit from www.revmaxconverters.com. Unit came with matching 'separator plate ID number', install was pretty easy, used Durametric to reset trans adaptations, but my problems were still there, though not as bad as before. Shift were smoother 20% of the time. But still more harsh than I think they should be. And the jerkiness while downshifting was still there.

So I read somewhere about transmission fluid working its way up the cables and getting into the TCM. So I took a look and sure enough there was fluid in the connector at the TCM. No fluid was present inside the module so I cleaned out the connector plugged it back in, same problem. Was unsure what TCM part number I could use, so I ordered a used TCM on eBay with a matching part number. Installed it, reset adaptations, same problems, maybe a little better.

Is this how the transmission is supposed to be? When the vehicle is cold and starts in 1st gear, the 1-2 shift is sooo smooth, but then almost every gear you can feel. Let me add that 1 out of 10 shifts are very smooth, and the harder/firmer shift are most noticeable with the 2-3 and 3-4 up and downshifts. I am ready to try anything else, I just don't know what to do next.

Could I have another bad TCM or valve body with the same issue?

What TCM part numbers can I use? Currently 09D927750DK

Is resetting the adaptations is as easy as just pressing the reset trans adaptation button on Durametric? Anything else I need to do?

J'sWorld

The tcm has to be coded for it to work properly. Maybe your original tcm was ok and you just needed to adapt properly? Something to note-

The adaptation values must be reset
using the Porsche System Tester
when the transmission is renewed/replaced.

If a new control unit is inst
alled, it must adapt firs
t. Poor shifting quality
can therefore be expected in the adaptation phase.

After the test drive, let the engine
run for 10 minutes at idle speed. This
ensures that all adaptation values
are stored in the control unit.

The instructions of the Porsche S
ystem Tester have highest priority.

The procedure described here has been
structured generally; changes or
additions may be made. It is
based on Tester Software 16.0.

The Porsche System Tester instructi
ons take precedence and in the event
of a discrepancy these are the instru
ctions that must be followed.
Deviations may occur with
later software versions.

During coding, it is essential to
guarantee the power supply for the 1. Connect the Porsche System Tester to the vehicl
e and start the System Tester. Switch on ignition. >>
Continue.
2. Select vehicle type using the cursor keys.
3. Using the >> key, move from the vehicle type to the li
st of control units. Perfor
m the automatic control unit
search.
4. Select Tiptronic with the curs
or keys and press the >> key.
5. Select Control unit re
placement with the cursor keys and press the >> key.
6. Select Read out values (c
odings) and press the >> key.
7. The message Coding read-out comple
te will appear on the screen of
the Porsche System Tester >>.
8. Switch off ignition and repl
ace Tiptronic
control unit.
--
> 373019 Removing and installing Tiptronic
control unit chapter on "removing"

9. Switch on ignition.
10. After replacement of the control unit, the vehicle data is installed under the menu Write in data read out (see
Section 6). Press the >> key.
11. System Tester displays Coding wr
ite-in complete. Press the >> key.
12. Exit the menu, switch off ignition, lock ve
hicle and read out fault memory once more.
SUBSEQUENT WORK
Subsequent work
1. For vehicles with a telephone, instal
l the telephone control unit. Refer to
91 90 19 Removing and installing
control unit for telephone
-
as of MY 2003 (All Models)
.
Porsche System Tester. It is essential
to connect a battery charger with a
current rating of at least 40
A to the vehicle battery.

E86

Thanks for replying,
Durametric has a coding section for the TCM, coding matched original, but both modules act the same anyways. Had the valve body in for a month before I bought new TCM, it wasn't getting any better. Had this TCM in for about 2 weeks now. I also have tried following many adaptation driving procedures I have found online for this Aisin Warner transmission.

J'sWorld

I thought the Durametric was not capable of coding. Did you actually adapt and let the car idle for ten minutes after test drive?

E86

I have let it idle, only for about 5 minutes though. I can't imagine it could be so simple, but I will definitely try this tomorrow morning.

The durametic seems to be able to code very few things.

bigbuzuki

What is the part number of the TCM you have installed?

E86

Both are part# 09D927750DK

bigbuzuki

That's the VW number.

I'm after the Porsche 955********* part number.

Does your transmission select 1st gear when you select PSM switch to off?

E86

I don't see a part# that starts with 955 on the unit and Durametric only displays the VW part#. I attached a picture of the module.

Yes it does select first gear with PSM off, 1-2 shift is firm while PSM is off. Not smooth like 1-2 cold shift with PSM on.

E86

Ok so I gave that a try, warmed up transmission, reset adaptation, went through a drive cycle, parked car letting it idle for 10 minutes. Turned it off and went for about an hour drive, no difference. Still jerky while shifting, it like it tries to shift way to fast, that's why I thought it was a computer problem.

Jonathon Rolstin

Do you check the fluid level is correct? Has to be done at 40C if I remember correctly and very temp sensitive.

JR

E86

I should have mentioned I drained and filled twice to make sure it was correct, used durametric to measure fluid temp. Although it's pretty easy to do if you have the correct equipment.
Yesterday I got under the car to look at the connections going into the transmission. As soon I disconnect them a pool of fluid came out of both, cleaned them up and reset adaptations again. Honestly almost every gear feels pretty good now expect 2-3, it is still pretty rough. Makes the car 'jump'. And still get some jerky downshifts while coasting to a stop. Maybe I received a defective valve body? I never got refunded for my core, so I'll give revmax a call in the next few days and see what they have to say.
Anyone else have any ideas? I appreciate the help from everyone.

J'sWorld

When I pulled my trans, those two connectors were full of fluid also. I was getting a 4wd system error but everything worked fine. Did the new valve body come with a new harness from the connectors to the inside of the trans?

E86

No it didn't, just the valve body. And a corner of it was kind of dented like it was dropped, not sure if a drop could cause internal damage?

Jonathon Rolstin

I also had fluid wicking up the harness on mine, I think that is my problem as well since I swapped with a revmax unit (also never got my core refund... thanks for reminding me... )

Haven't been troubleshooting it because my motor blew 8 months ago and I have been trying to get it back together....!