430 F1 Transmission - P1741 code

Was out today in my 2007 F430 (23k miles) and cruising along when the transmission light came on and the car dropped to neutral. I was unable to engage any gear and ended up parked in the center divide of I-5

After restarting, I was able to get it into first, but if I tried for 2nd it would drop back to neutral. So I got towed home.

Pulling codes, I have a P1741 from the gear box. What is odd as well is the PIS dropped on its own to 1.49 from around 4.2. I am able to engage all gears while the car is off using my Launch computer and the F1 pump sounds good and is holding pressure as normal. No odd sounds, obvious leaks, etc.

On the Launch, it shows self-calibrated position as 9.25mm.

Is this just time for a new clutch?

Thanks! Appreciate all suggestions.

Aaron

 

One other thought is the potentiometer(s) in the actuator are toast and that seems like a possibility after reading this post:

https://www.ferrarichat.com/forum/threads/f1-potentiometers.551920/

 

Hi Dom,

Thanks for the reply. New closed clutch position is showing as 7.82mm.

I checked the the pressure and it is getting to around 55 bar. About 6 sec to pressurize when I open the door and I am getting around 3 shift cycles (N-1-N-1-N-1) before the pump runs again.

In N, the primary gearbox angular speed is 0 and engine speed is 1044 rpm, so it seems to be holding the clutch open fine if I am understanding the reading.

I cleared the code and it is letting me shift while in the garage to 1-N-R. Once I cleared the codes, PIS is now reading 4.2, so that seemed like a fluke. I don't think it would ever have engaged 1st if it was truly around a 1.5 PIS.

Aaron

 

ok... updated my Launch to 3.0:

PIS 4.19
Self-Cal Closed Clutch Position 22.75mm
New Closed Clutch Position 18.99mm
Clutch Wear: 67.2% used

Potentiometer Travel for Engagement: 534
Potentiometer Travel for Selection: 541
Batt Volt: 12.53

Uploading a screen grab of a few gear shifts while tracking the above travel... not sure if that is helpful.

(and thank you again for your ideas... nothing more irritating than not know if it is going to fail again on the hwy. That was a bit dangerous)

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looks like voltage is 14.25 running.

Not sure about the spikes in the gearbox speed... guessing when I moved between N and 1st. Probably not really relevant to this I am guessing.




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These cars and their batteries It is less than 2 yrs old - Interstate AGM MTZ-34R. I did run it dead once, but when I took it in to get tested it was fine. That said, it seems that 12.4-5 volts at rest is a bit low when it has been on a CTEK for 24 hrs.

 

I have cleared the codes and just shifted with it in the garage from R-N-1 a few times with no errors. I also used the launch with just the ignition on to cycle through all the gears fine. I'm a bit hesitant to back it out of the garage since I'm not sure I'll be able to get it back in, but I probably will have no choice at some point.

Voltage wise, when the issue happened I had already be driving for at least 30 min from our last stop, so I would think it was pretty charged up. Right now it has no codes, but I can let it idle, maybe cycle through R-N-1? (The issue happened when I was either in 5th or 6th I suspect.)

I'm guessing I should also pull the diffuser and just visually make sure the connectors are secure/no leaks/etc. Just a sanity check. I do have the Smart eMT F1 relay and haven't gotten any errors or warnings from it this whole time. It is pretty sensitive to pressure issues/pump run times in my experience.

I will also try and take the battery in to get it tested at Interstate - maybe I will get lucky and they will replace it under the warranty. It is probably just my perception, but it does seem to take a split second longer to turn over after sitting on the charger for a few weeks than I would like vs when I stop/restart in the middle of a drive.

If it gets to it, I'm not opposed to replacing the (overpriced) sensors if there is a chance that is it - (maybe someone has some tips/video on DIY'ing the alignment of them?).

Thanks
Aaron

 

Just had my Interstate AGM load tested at Interstate and it passed at over 900 CCA. Looks like the battery is fine.

 

Yup… even after the load test my voltmeter is showing 12.85

Going to clean up the connectors/reinstall and then pull the diffuser to see what awaits me there.

 

I’ve pulled the actuator before, so I am confident I can get to them and take them out. My concern is aligning them properly. That and the 70 mile tow to the shop.

Maybe someone around here is up for an hour of paid consulting

 

This thread made it look like there is some alignment to the pots…

https://www.ferrarichat.com/forum/threads/f1-potentiometers.551920/

I definitely can get to them, and given the cost of getting towed or worse, I may just order them. Better $800 now than having it fail again in the middle of the highway.

 

I think my next step is a few laps around the the neighborhood going through the gears. If I can make it though that I may decide to leave it alone. I will also keep a close eye on the voltage before the next few outings.