430 Gearbox F1 issue - P1741 error after warming up the car - Solution

Because this (Dutch) winter is quite soft and with dry roads, it was time to get the car out of hibernation. I had done some inspections and cleaning during the last period. When I went out for the first drive to see if everything was working properly, I encountered an issue after warming up the car (20 KM). The gearbox light came on the dash and it started beeping and the downshifts were really slow. When I came to a stop it wouldnt go into gear like normal. I was able to carefully shift to 2 gear and drove home. When checking it showed the error code P1741. after removing this specific code the car would run normally during the short drive (because the rain). Next I did the same test drive and again at the same higway exit it would have trouble downshifting. Thankfully I had my computer running the live data stream and I saw I have normal pressure and it was holding normal pressure, so no leaks and a normal functioning pump. I drove home in 2 gear again and while keeping the car running (with the light on the dash) I opened the engine lid and closed quit fermly. Immediately the error on the dash automatically disappeared. Also during the test ride the car worked perfectly and the error code didnt reappear.

Later that night I checked the switch and it seemed even when closed the switch was able to deactivated again (I think) because of the vibrations. Also I was able to manually disengage the switch while the lock was closed. Apparently the gearbox doesn't like that and troughs these errors. I recalibrated the switch and the problem hasn't appeared.

I thought would share this with you guys as a possible solution for this error code. I know this error could have way more causes but this is just one thing you can check when running into the problem as described.

Included is a image of the lid switch that caused my problem.
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Were you getting the engine lid opening warning?

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W… T… F…

I’ve seen some weird errors on these beasts - but engine cover throwing a transmission error?!

Kevin

 

That rear bonnet open state. This can cause F1 issues.

 

Fro what I remember that switch connects to earth when the lid is down, might be worth cleaning the connection to earth

 

Mine is currently zip-tied 'closed' as it would often think the engine lid was open and not let me start the car.

See post:
#26

I need to fix it properly actually, thanks for the reminder.

 

Well not quit. It was the one in the speedometer

 

I thought so as well at first but the other switch (with just one red wire) is the brakelight of the trunk. This switch has got two wires

 

Good tips, thank you all

 

I had a similar issue with the 360. Turns out the emergency pull (located under the fuel filler door) has a manual cable that connects to the rear deck latch. That became tensioned somehow and was crooked at the latch, which caused the rear deck to open up when hitting bumps. 30-second fix.

Another issue that left me stranded with a F1 error was a blown brake light fuse. Turned out the wiring to the brake lights was old and corroded. I replaced with a replacement harness on each side (Ferrparts), and all is good now.

Brakes and ABS are common to affect transmissions as a safety feature in many European vehicles. For example, a bad brake switch on a Mercedes will throw you into limp mode also. The problem is that in an automated manual, limp mode turns your car into a horse (the bad kind, bucking, etc.) or shuts you down altogether. So these simple electrical gremlins, which are simple to fix, account for the majority F1 errors when the clutch and pressures are within spec.

 

I am glad it turned out to be the latch even though the warning light that you received in combo with the p1741 usually means the potentiometers.. not the latch

Keep a eye on it ..

 

Good advice! I was reading about the potentionmeter a lot.

 

Traditionally, lid open warnings need an earth to illuminate a bulb. That's why I don't understand why Ferrari chose a closed circuit with the lid down on the F430. Also, traditionally, Ferrari wiring diagrams show switch states with all the doors, windows, roof, etc, closed. This is the diagram I have for the switch on the F430:

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Having said that, the F430 switch symbols seem to be somewhat random regarding their "normal" state. Maybe someoene could check the switch with an ohmmeter with the lid open?

I'm assuming only one switch for "lid open", so I don't know why you weren't getting the lid open warning on the dash. On the F430, does the F1 warning override the lid open warning? Or do the warnings cycle?

In theory (and like the 360), the engine lid switch should talk to these devices:
Immobiliser ECU (360)/Alarm ECU (F430)
F1 TCU
The Instrument Panel (for lid open warning)
Roof ECU (on Spider) to stop the roof being opened with the lid open.

In the wiring diagrams, all the connections/splices are clear except how the F1 TCU knows that the lid is open. Is it getting data from the Instrument Panel on a databus? The pinout for the F1 TCU pinout doesn't mention the engine lid switch at all.

 

Ian

That is why I believe it is a potentiometers problem more than a latch issue

Sent from my moto g power using Tapatalk

 

I got that impression, too, but it's possible that @Ferrari8403 simply missed the warning. I imagine you'd be under a bit of stress if your gearbox started misbehaving.

 

Thanks all for the feedback! I agree it sounds all strange, but the sympthoms for a freaky potentiometer the are not showing. I’ll keep a close eye on it offcourse. For now everything works great and cant wait till spring really kicks in.

 

Just a quick update. Yesterday it was the first time I went for a ride and the error didn't occurred any more. So apparently this could be one of the issue when the warning/error light shows up.