RKW221

Hi
2007 S550
Shifts nicely from P to R and D.
Shift from 1-2 only after several slippings and half a mile driving. No shifts past 2. In diag mode shifting manually shows target gear correctly but only to P R D 1 2. Trying to manually shift to 3 is not even showing 3 as a target gear.
Filter oil swapped and correctly filled at 45 C.
Adapted via Launch X431.

​​Cond plate swapped.
Valve body cleaned, very very little shavings. Didn't take out spring valves but checked tension and ball valves also.
One faulty solenoid swapped. All solenoids resistance tested. Nets pretty clean and looked ok. Magnet cleaned.
Car runs rough.
Tumble flap issue will be addressed.
Voltage too high on transmission error. Voltage regulator ordered for 910 option.
Rear battery drains. Teleaid coming out when MOST coupler arrives.
New ABS wheel sensors coming.

​​​​​TCU should have latest software.

Bought it really cheap at copart after two years of massive neglect. 140k miles. Project car as I was sad to see it rot....
Drive authorization on instrument cluster active after replacement.

Any ideas?
Thank you
Richard

JettaRed

iTrader: (1)

My understanding is that the solenoids and conductor plate are matched at the factory and cannot be swapped, though I have no confirmation of that. Do you have a history of the car?

Chevota

When my '99 did that it was limp mode because the tcu took dump. bought one on ebay for ~$200 and it was good to go. just needed to check if it was compatable, which the junkyard seller did for me

RKW221

Solenoids are adapted, no issue.
TCU new with the conductor plate.

​​​​​​Changed the valve body today.
Last chance voltage regulator, then it's a rebuilt transmission swap in the garage lol

CaliBenzDriver

Can you produce a complete scan report?
Limp mode condition should leave clues behind...

It sounds that your rough engine is in this for something, not just TCU not shifting out of 2nd.

RKW221

I will do that tomorrow if I have time. Moving day...

​​​​the only error I saw was tumble flap sensor related. I swapped one coil on cyl 1 4 weeks ago and changed spark plugs.
The under voltage at terminal 30 and the rear battery drain is an issue, but as I don't drive the car too far it's a problem. Will remove teleaid tomorrow, finally got the most bypass. Recode the most ring and we will see. Siren is out already.

I'm thinking of taking the trans out and doing a new clutch pack, but afraid there might be scoring on the shafts, bearing issues or sth else causing the probable low pressure to engage the clutches for the 2-3 and higher upshifts.
How different were the 722.9s from different models? Housing the same? Would swap my cond plate anyways, but not sure if a cls, gl 722.9 fits into the s550. I know the 722.9 came in different models numbers.
This is driving me a bit crazy.
I suspect the idiot previous owner had the working pressure solenoid issue that I fixed with the new cond plate but he drove the car with the clutches not being fully compressed and therefore worn them out completely. Is the shift from P to 1 done at a lower pressure than 2-3 and 3-4 etc? Just so I understand. Or is the pressure constant, just rerouted by another solenoid?
ISM no error, but that only shifts p-d-r I think. Correct?
Also the hood closed switch on 1 side was out, I ziptied it, no change.
How does limp mode behave? Does the car rev into 4-5k rpm but the transmission doesn't shift higher? Or are revs limited? But limp mode should show an error on the TCU, no? All I get is the implausible gear/slipping error.
I'll try to swap the voltage regulator tomorrow, but the working voltage when the car is running looks ok at 13.8-14.1V.

​​​​​​

CaliBenzDriver

Too many things wrong at the same time.
You need to prioritize to get results.

Your engine + tranny + chassis all need attention.