Tiptronic Controller Superceded Part

[mudman2]

Loren et al

I am trying to locate old and new part numbers and the related revised TSB for the Tiptronic controller hardware (under the Passenger seat I think) or any more information related to it. This may be to soon for the actual TSB but the number will do,

Thanks

[Loren]

I just got the July TSBs... about 3/4 inch stack of paper. I went through them quickly and I don't see one for Tiptronic control boxes yet. The parts list shows about 8 different part numbers :lol:

PM me your VIN and options and I'll see if I can find something that matches.

[mudman2]

Loren

I will post more when the job is done, but in brief, ...the dealer has been directed to replace 3 modules, as you suggested, the DME, Auto Transmission and one other. They had wanted them to use parts from a 2005 S, but the dealer did not have one on the lot, so PCNA are arranging for parts.

In addition they ordered replacement Remotes with extended range.

Mike

[mav]

Mike, what did you tell to your dealer? What is the TSB relate to it?

[mudman2]

MAV

I just related what seems to be the pattern around the country. Armed with that knowlewdge they had tp act. Fortunately I have a good relationship with my dealer and they responded.

[mudman2]

Loren, Gert reports a DME software uodate CD part being released for install using PIWIS, version 3.1. Said to include major remapping.

[mudman2]

The 05 Controller has arrived and will be fitted on the 23rd, I also have the latest DME software loaded to make it compatible with the new controller. I will let you know what happens.

[mudman2]

My first drive this morning with the updated auto trans control unit installed.

Parts Used

955-618-022-02 Control Unit. Tans

Procedures

37010000 - Tiptronic ODB

37301900 - Transmission Control Module Removed and Reinstalled

Initial impressions

1 - When PSM turned off transmission now switches to D1.

2 - With PSM off, Aggressive changes, higher rev mapping.

3 - All Changes much smoother (significant change)

4 - On the 90 degree corner test at 45mph, 3 still the lowest gear selected with PSM on, will try later with PSM off

Next Tests this afternoon

1 - Straight line freeway speed kick down

2 - Merging onto freeway

3 - acute angle turns with kick down

Seems a step in the right direction.

[mudman2]

Its been nearly a week since the 05 module was fitted to my CS. During that time I have done commuting, long haul freeway and town driving, here are my impressions.

First of all the change in performance with the PSM off is quite staggering. The aggression is obvious from the D1 start all through the range. I never could get a D1 start before the change, M1 yes, apart from the cold start scenario.

With PSM on I do notice quite a change to the behavior of the transmission, it seems more inclined to change down than before in response to gas pedal imput in the 40-55 speed range. It does change down faster if you floor it than it did before, I think that response is more like my MB in that respect, but there is still a wind-up.

When floored the revs start to climb quickly but there is still a slight delay before the tranny drops a gear or 2. I think they are using revs instead of G force to change down ( I am not an expert in this but this is my engineering view) All of this happens in a fraction of a second but the delay between revs climbing and the change down is still notciable.

The main things I was concerned with were the 90 degree cornering at low speeds (45 mph into the turn 25 mph out of the turn) and the sprint response joining freeways / autobahn's etc

The S still does not change down to 2 on the corner, leaving you in a torque no-mans land with the engine fighting to respond to the gas pedal in 4 or 3 when its obvious that it should be 2.

Again I do not think the Cayenne has a G force setup to sense the condition and force the logical change. Its a heavy car without gearing help the engine cannot do it alone.

I did not experience the sprint "death" problem at all during my testing, its too early to say but it may be gone, I will let you know if it does happen.

If you have specific questions let me know.

[Loren]

There is now a TSB 3/04 3730 Hard Shifting In Range First to Second (dated 11-18-2004) that may be of some help. It is in the Cayenne TSB section.

[rockitman]

I believe the TSB Loren refers to is nothing more than having the tip control unit replaced along with the DME re-program. TSB W515 and W516, respectively...fyi

Edited December 14, 2004 by rockitman