Another Tiptronic Fault

[cieranc]

Hi, thanks for this, I've seen it. I have stripped the shift circuit mechanism, both magnets are in the right places and are secure.
When I move the stick through its positions, the correct light lights up for each position, which suggests the magnets are in the right place at the right time.
The car actually drives alright, it just goes into fault if started up from Park.
Ideally I need to find a "how to" for measuring the selector position with VCDS lite.
This will at least rule the F189 out.
Cheers, Cieran.

[cieranc]

Hi All,
Today I've spent a bit of time with the VCDS Lite, checking the Selector Position and Tiptronic controls.
When I start up in Park and move through the positions, I get the following:
P 1000
Z1 1100
R 0100
Z1 1100
N 1110
Z2 1010
D 1011
Z3 1111
S 0111

This to me proves the F125 Selector Switch is working correctly.


Then I moved onto the F189 switch, the one the fault codes flags up as spurious signal:

Move stick from D to the right = 'M SWITCH'
(In the manual position to the right) Stick Forward = 'UP BUTTON'
Stick Backward= 'DN BUTTON'

And on the steering wheel buttons:

+ = UP BUTTON
- = DN BUTTON

As far as I can see, everything is working correctly as it should be. Do the above readings look right?

[cieranc]

Anyone shed any light on this? I've been away with work, home now and trying to get to the bottom of this fault.

[abby1]

please tell me how you remove gear stick i have pulled silver button out but will not release any clues allroad 2002

[DGSdale]

please tell me how you remove gear stick i have pulled silver button out but will not release any clues allroad 2002

Pull down the plastic collar (slightly tapered and usually silver) immediately below the gear knob. This must be done first. Then, whilst pulling the silver button out, pull up hard on the gear knob. Careful you don't smack yourself in the face when it comes off! Replacement is the reverse - to get hold of the silver button (it will spring back into the gear knob) use blu-tack.

[cieranc]

I've got hold of a known good TCU, from a breaker I trust.
It's made a difference to how the car drives, gear changes are smoother and faster. Which makes me think that either there was a problem with my TCU, or this new one has been chipped/remapped at some point.

But still the same fault and code for the F189 switch.

Any ideas people, I'm seriously out of ideas now

[cieranc]

.

[cieranc]

Well, I've dropped the sump on the gearbox, checked the wiring as best I can. Oil that came out was black but not smelling burnt, so OK as far as I can tell.
Replaced filter and oil as per the manual.
Cased the wiring loom from the gearbox multiplug as far as I can, no fault found.

Fault still exists.

Anyone come across this fault, or can anyone suggest anything else to check?

I've seen a similar thread on another forum, describing the same symptoms, but no answer to the problem.

[Mark E]

Ever get an answer to this? I have the identical problem. It only ever does it the first time I start the car in the morning. I read somewhere that if parked on an incline, as mine is, the plastic plate slips due to gravity, causing the fault. I've never experimented by parking somewhere else. How accessible is the TCU? It's under the driver's footwell correct? If changing over, is it just a case of unplugging the old one and plugging in the new one or does it need calibrated with VAG? Any advice welcome. My car too drives pretty good but is sometimes slow to shift up

[cieranc]

Hi, sorry for the late reply, I'm at work (abroad).
No, I never sorted the problem. I sold the car with the fault still there.

If you remove the trim on the sill, move the seat right back and as high as it'll go, lift the carpet up, you can just get the TCU out without any further dismantling.
It sits in a weather-proof case.
It's all plug and play without the need to code it, just make sure the ignition is off when you do it.
I have a spare TCU at home, can't remember the number off the top of my head, 4Z7 ... .. .. 156H I believe ???