355F1 transmission problem

welcome to Ferrarichat! Your first post was just fine, but sorry to hear it's about a problem. It does sound to me like a water issue with the electronics...have you given it enough time to dry out completely (like a few days)? I'd try that and see if it is better. Personally, I've washed the 355 with water maybe twice in the 3 yrs I've owned it (only after driving in the rain...and even then, I avoid spraying the engine cover as much as possible).

For sure let us know how it turns out, good luck!

 

Well I washed mine once...I learned a good lesson also
try putting a large fan on it for a day or so probably will
dry out. Then DO NOT wash again, wipe clean with a detail spray

 

I had same problem with my 98 f1... but my car only be able to go N-R-1-2 gears... if I have to up shift from 2nd to third gear... I have to double tap bothside f1 shfiter once very quickly and then tap up-shift once again and it is now in 6th gear then I have to down shift right a way to the third or fourth gear... and I have to do that everytime I have to up-shift a gear from 2nd gear... but no problem with down shift...

My car is now in the shop for repair and it will be costly.... damn... but I still in love with it.. usually this problem cost by F1 pump...

 

My car is now in the shop for repair and it will be costly.... damn... but I still in love with it.. usually this problem cost by F1 pump...[/QUOTE]

David that is not correct because if the F1 pump goes it will not allow you to select any gear when the pump stops working there is enough pressure retained in the accumulator to allow the system to default into neutral,it appears to me that this is a water ingress problem though I do wash mine regularly with water and have never had this happen.

 

when I do wash my car (very rarely) I put an old blanket over the engine and I place a folded plastic tarp over the blanket. This pretty much eliminates any water intrusion. Small hassle but effective.

 

I wash mine all the time, never have made any attempt to keep water off the motor. Have been caught in the rain too. It may be electrical, and it may be due to the water, but a car - even a Ferrari - should be able to get wet.

 

There is one thing which is common to the speedo, the suspension ECU and the F1 TCU ...
The speedo sensor! If it fails, and that is common, the speedo is obviously no more working, but also the suspension ECU set the light because it needs to know the car speed to work properly, and the same for the F1 TCU which needs to know the speed of the output shaft through the car speed. TCU rejecting gear selection above the 2nd gear is a symptom of car speed data not available.

I would start by checking and drying its connector, on the left side of the gearbox, just beside the oil hoses. If it doesn't work, I would think to change the sensor. At the very end, the speedo could be at fault because it does the frequency division before sending the car speed info to the suspension ECU, the F1 TCU and the Motronic.

 

I agree at the end of the day it's a car rain, wash what ever should not affect it.

 

Wow, what a quality response - thanks Eric. I'm constantly amazed at how smart people (on this forum) are.

 

WD-40 is your FRIEND. Any time you are near an electrical connector on your car (any car), disconnect it and spray some WD-40 in, then reconnect. This will also make connecting and disconnecting the electrical plugs easier. Sometimes much easier.

By the way, you can never really use too much WD-40. Worst case is some overspray that will make adjoining parts temporarily a bit more shiny (sometimes a good thing) and allow them to collect a bit more dust.

 

+1, Eric has many great posts...thanks!

 

Hot damn I hope that is the problem because that was so fricken' clever I just want it to be true!

 

He sure does and many of us are fortunate his English is so good.

 

Thanks guys !

This car literally took my soul! I received so much reading this forum and ... the WSM. I am glad to help when I can.
I hope we will have some positive feedback from the PO, otherwise you will have to change your kind comments ...

 

There is no such a "shunt" or 15V involved in the speedo circuit.

In the speedo there are 2 independent parts (on the same PCB) which use the same input signal. One part is in charge to manage the speedo needle (frequency to current conversion). The other part makes a frequency division by 2 of the speedo signal (digital) before dispatching it to the suspension ECU, the Motronic and the F1 TCU.

If both parts go wrong at the same time, I would suspect that either the power supply of the speedo is at fault, or the signal from the speedo sensor is no more there or is corrupted. The speedo sensor is a Hall-effect sensor, so it needs a +12V power supply and a ground to work properly, and supply a digital signal (0 - 12V) the frequency of which is proportional to the speed of the car.

So, be sure that +12V and ground are OK. Grounding is done by the case of the sensor, +12V is provided by 1 of the 2 wires (can't remember the color).

To investigate, I would suggest:
- to measure the 12V at the sensor connector level and at the speedo connector level while driving ... just connect a free wire on the +12V pin and route it to the cabin where you can look at it with a DVM.
- to check the grounding on the gearbox
- to display the speedo sensor signal, at the speedo level, with a portable oscilloscope or ... with a laptop.

 

OK I see what you mean.
+15 doesn't mean there is 15V on that point. (node) 15 is a generic designation of power supply (+12V) switched by the key.
Similarly node 30 would designate a non switched power supply (direct connexion to battery).

On the WSM, shunt is the translation of the italian word "derivazione". it is clearly an interconnection.

 

my 1999 355f1 the speedo quits working and the f1 light comes on at the same time I dont know which was first. Then I cant shift until I pull over and restart. Any ideas

 

As Eric stated above when the speedometer fails the transmission does not know which gear it is in . Check the speed sensor first. Also please give more info, like do you only get r,n,1,2. If you do generally this is a falty sensor.

 

I havent had a problem since I think it way have got very wet since it sat out in a storm all night. I cant replicate the issue. I do think its a speedo issue not an F1 issue.

 

Electromagnetic sensor is the likely problem, this can be replaced for about $300 dollars
The shifting issues are indicative of this...