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Tiptronic faults

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Good Day all,

MY03 Tiptronic DME7.8

Tiptronic Saga continues, in the past I had problems with leaks, did a replacement of front pump

rebuild t/c, but this time it is something new

faults given by Durametric

post-20238-044642700 1278090532_thumb.jp

post-20238-091200500 1278092149_thumb.jp

I did all the troubleshooting for faults indicated, everything checks out.

Q: what extra diagnosis does PST2 and PIWIS can do over Durametric to narrow down

the problem of tranny?

any help is greatly appreciated

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P1818 Pressure regulator 2

Possible fault cause

- Short circuit to B+/ground/mutual short circuit or open circuit

- Pressure regulator is faulty

- Tiptronic control module is faulty

P1823 Pressure regulator 3

Possible fault cause

- Short circuit to B+/ground/mutual short circuit or open circuit

- Pressure regulator faulty

- Tiptronic control module is faulty

P0734 Gear monitoring – 4th gear

Possible fault cause

- ATF level too low or too high

- Sensor for transmission input speed (turbine sensor) and sensor for transmission output speed (output-drive sensor) electrically swapped

- Coupling or brake is faulty

- Hydraulic control unit is faulty

- Tiptronic control module is faulty

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Thanks Loren,

I'm not clear on one thing " the coupling or brake is faulty" if possible to expand on this item please

btw, I did clear all faults and none came back, I'm doing all the possible checks I can do for now.

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Thanks wvicary,

My last transmission fix was around june of last year ( it an annual event, unfortunately)

I have done alot of troubleshooting between the tiptronic control module harness connector and transmission connector, so I disconnected transmission connector and reconnected many time.

weird thing as I was taking car for short distances to test things with durametric, when I put the car back in garage idling, transmission did not respond to reverse or D or M modes, nothing happens, no movement (no faults present), then I shut the engine off and restart immediatley, magically I have reverse and other gears as if nothing wrong with transmission.

I know I might have a problem with AOS, I have seen blue smoke after overnight engine start, but not often enough

to warrant taking AOS out, because blue smoke problem started right after I had an oil change, and I think I put little bit extra oil. I have the top of engine exposed and engine does not sound normal when giving little jabs of gas, a weird sound comes from the AOS tube that connects AOS to the intake manifold. more like a vacum leak is the best I can describe it.

I'm still in the process of troubleshooting, I'll double check the transmission connector again, just to make sure it is sitting right. thanks again wvicary.

any more ideas is greatly appreciated.

and thank you again Loren for the PM.

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  • 1 year later...

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