Joy! Tiptronic emergency / end run

[BirdDog]

I have a Duremetric enthusiast cable and love it. Lets me read the status of every system in my Boxster, allows me to reset some codes (like airbag), enable some minor things (like OBC) and allows me to look at camshaft deviations, O2 outputs, etc. But I'd understand if the almost $300 USD price would scare a lot of people away. Also requires a computer. I used a Motion Computing J3500 Windows tablet computer with mine but any laptop will do (I've even used an old Dell Mini 10 netbook with it).

Autel - I don't have one so I can't comment other than to say that if it can read tranny codes, it could save you a bunch of money over a Durametric.

I have Torque Pro on my phone, and it's great for what it does (and you can't beat the price!) But as far as I know it only reads engine codes.

My generic code reader is an OTC that also allows me to read ABS codes on most cars/trucks. Really helped me isolate an ABS problem I had on my GM car. But I haven't tried it on the Boxster.

When you are refilling the tranny, the car has to be level, so it will be up in the air with all 4 wheels off the ground. I always say you can't have too many jackstands/jacks under it. Besides jackstands on each corner, it wouldn't hurt to put an extra jack or two under there as backup...

I'm with Paul - unless you have a low fluid level, changing the fluid probably won't fix your problem. Then again, I have heard of them slipping if the fluid is burned/too old. Or maybe the filter is clogged... Either way, it can't hurt to change the fluid and filter, and it will eliminate that as a possible cause.

But like JFP said, you really need to read the codes...

[mikeyg]

Ordered the Autel 802 so hopefully it'll be a swift delivery out here via forces BFPO!

[mikeyg]

Hi guys.
Right, my Autel link arrived today so connected up and had a look.
From the transmission / Tiptronic section of the diags I got these listed:-

82 Pressure Regulator 3
0 - Please refer to service manual
24 - Please refer to service manual
6 - please refer to service manual

I don't have a service manual. Is it online anywhere that someone can point me in the direction of or...
Could one of you kind people let me know what it means?

Many thanks
Mike

[78F350]

The only one of the codes that I found in the Tiptronic diagnosis section of the service manual was 82 (Porsche DTC 82, OBD II P1823), "Pressure regulator 3, Open circuit/short circuit to ground, short to B+."

I don't know anything about this stuff, but if it's going to cost thousands for a shop to fix anyway, I wouldn't fear digging in and seeing if I could make it better...

After noting the codes, I would clear the codes, try driving (no farther than I would want to push the car) and see what happens.

For the Pressure Regulator faults 80, 81, 82, and 83, the manual says:

"1. Check the pressure regulator with wiring. To do this connect an ohmmeter to the control module connector and measure the resistance:"
-Pressure regulator 3 is measured from pin 52 and pin 29. "Nominal value: 5 ... 10 Ohms."
***Page 37-3 of the Bentley Manual shows the numbering of the pins.
(Other pressure regulators: pressure regulator 1 is pin 52 - pin 5, 2 is pin 52 - pin 1, 4 is pin 52 to pin 4.)

"2. Check the wiring from the control module connector pins 1, 4, 5, and 29 to the 16 pole connector pins 3, 11, 2, and 7 for continuity, short to ground and short to B+."
***For pressure regulator 3, that's just pin 29 on the control module connector to pin 7 on the 16 pin connector.

3. [...the last step is to pull the whole valve body out of the transmission and check the resistance at the pressure regulator itself, 5 ... 10 Ohms.]

What is not mentioned is that a faulty TCU may be the problem.

Here is a link to download the parts manual directly from the manufacturer, ZF:
https://www.zf.com/global/media/zf_media/document/int_print_catalogs_documents/usa_4/5hp19flporsche.pdf
Lots of good diagrams and info including the fluid service procedure.

If you want to really get into the transmission, there are some great YouTube videos by Jeff Richardson rebuilding the BMW version of the transmission (very similar to ours).
https://www.youtube.com/watch?v=P9foaj6Q-gE