Tiptronic P0733

[tightbox]

Thanks...at least someone finally got it!

[Okanebm]

Well, I was supposed to post in glaring detail, my great valve body rebuild. So there i was, Virginia on jacks, valve body removed. Gave it an entire afternoon and had the valve body back together again. Put it back in, filled with ATF-1, and had some slight slip in 3rd gear. However, no limp mode this time and no codes thrown. Back in the air for another flush and fill.... Wait for it... No reverse. As a matter of fact, it wants to lurch forward even in park! Basically, it's in drive in all gears, even neutral! But no codes! Any ideas? Desperate, but still on hot standby to buy a transmission if need be...

[Okanebm]

Tightbox, sweet screen name. Where did you get your transmission from? Did it include a torque converter?

[Okanebm]

Pouring over some notes I made while doing the rebuild and the optest. On third top-off of ATF, when engaging all the gears in manual mode.....

1. brief light off of ABS light.
2. shifted out of manual by itself.
3. ABS light out.
4. Manual mode will not re-engage.
5. Shutdown
6. Re-start

After that I continued with the top off with no further issues again, test-drive, semi-sat, parked, always in drive issue started.

I'll be right back.

Okay! ABS light is on, starts in park, no reverse, and wants to go fwd in park, reverse, neutral, and drive..... Multi-function switch? Transmission Computer? ABS sensor? I'll continue to ponder with a scotch, no condition right now to be behind the wheel.

[Ian c]

My guess is multi function switch .
I can send you the porsche tech notes for testing everything else on the tiptronic .
You'll need a multimeter with volts , continuity , miliamps and ohms .

Don't buy a multi switch until you have pm'd me about new prices ....

[Skootnasty]

The range switch is telling TCM that trans is in Park, because DME is allowing it to start. I have never seen these switches fail to where it reports PARK and some forward gear at once. If it did fail this way, Tip module would limp home/fail safe it and flag codes.

Did you separate the plates of the valve body, or just ohm the solenoids and put it back together?

Skoot