Technical Duel logic transmission

[Dougsolv]

Can anyone advise me on why my Doblo duel logic does not start it says transmission issue. it only has 27000 miles on the clock. I took it to a transmission specialist who said it could be an accumulator. Any ideas are welcomed as it is a sitting duck at the moment.

 

[varesecrazy]

Can anyone advise me on why my Doblo duel logic does not start it says transmission issue. it only has 27000 miles on the clock. I took it to a transmission specialist who said it could be an accumulator. Any ideas are welcomed as it is a sitting duck at the moment.

Hi

If this has happened over a series of weeks..maybe


A sudden failure is more likely to be electrical


Was the fluid tank low?

 

[Dougsolv]

Literally driving it. It stopped went into neutral had to a call the AA to tow it home. It now wont start and just says transmission issue. I'm guessing I cannot interrogate it with ODBII as I understand fiat has protected codes.

 

[Dougsolv]

Sorry I will check the tank this weekend. And thanks for the prompt response. Appreciated.

 

[varesecrazy]

Woth disconnecting the battery for a couple of hours.. will wipe some codes..help reset things

Idea: check your Brake Lights

That circuit is used as a Sensor for the Auto


Obd codes.. Fiat only disabled access after 2018

You need acccess to the Body Computer
.as well as engine ECU

basic readers only read P Series engine codes

 

[Dougsolv]

Work disconnecting the battery for a couple of hours.. will wipe some codes..help reset things

Idea: check your Brake Lights


That circuit is used as a Sensor for the Auto

many thanks for this I will do.

 

[Dougsolv]

Hi further to my issue with my Doblo any further advice would be welcomed. So the car basically does not start, I removed the battery, reconnected pushed the auto lever over to manual side and it starts. Turn the car off and it does not start again. repeat the above and it happens again. I get a circular warning light, engine shape warning light and a message saying transmission. (see photos). i put my ODB reader on it and I got the message as in the photo.

This car only has 28000 miles on it and I cant see it being the transmission but an electronic fault.

I tried to get a diagnostic check via a Fiat dealer as I beleive the diagnostic machine I have will not read all Fiat codes and I cant get an appt to October with dealer.

Any ideas would be welcomed.

 

[jackwhoo]

There is no way forward other than reading the transmission ecu

Lots of people on here use multi ecu scan with an appropriate interface to plug into the diagnostic port

 

[Dougsolv]

Thanks for your replies. Can you suggest a diagnostic tool I can purchase to interrogate this car

 

[jackwhoo]

Yes

Multi ecu scan software on a laptop computer

Plus an interface to connect laptop to vehicle.

 

[varesecrazy]

Where are you based?

Plenty of forum members around with the correct kit to read all the OBD errors

 

[Dougsolv]

I live in Bishops Stortford Herts.

 

[Dougsolv]

Yes

Multi ecu scan software on a laptop computer

Plus an interface to connect laptop to vehicle.

 

[Dougsolv]

Hi again,

I have now been able to investigate the car with a decent scanner. It has revealed the following p2fc sensors identifying P1741 and P1742 which I believe are engagement sensor and selection sensors. One is apparently on the top of the gear box and one at the back.would you know if these sensors are easy to access to replace??
Any advice would be appreciated.

 

[varesecrazy]

The Grande Punto section probably has the best technical info

Member @irc may well understand your question far better than me

 

[irc]

Hi
I've not had a lot to do with Dualogics for a while (I have 2 or 3 units in a pile awaiting seals, but no reliable source of seals to fix them with).
If your system is leak-free (i.e. the reservoir has never been topped up and the level is correct) then I suspect an electrical problem.
It sounds like your pump must be working - is it running as before (runs for a while when you open drivers door, and then at intervals as you drive)? If it runs almost continuously then the accumulator may have failed. However this would not give the other symptoms you see.
There are various things which have to be correct to allow start-up, when they are all OK then the starter inhibit relay is powered and car can start. If it will start in manual mode but not automatic then something is being misread or has a missing signal.
Almost impossible to diagnose remotely, but MultiECUScan (with the correct cable) can read all gearbox values, which will point towards whatever is not working correctly.
Not sure if this is helpful or not, but good luck with fixing it.

 

[Dougsolv]

Thank you so muc

Hi
I've not had a lot to do with Dualogics for a while (I have 2 or 3 units in a pile awaiting seals, but no reliable source of seals to fix them with).
If your system is leak-free (i.e. the reservoir has never been topped up and the level is correct) then I suspect an electrical problem.
It sounds like your pump must be working - is it running as before (runs for a while when you open drivers door, and then at intervals as you drive)? If it runs almost continuously then the accumulator may have failed. However this would not give the other symptoms you see.
There are various things which have to be correct to allow start-up, when they are all OK then the starter inhibit relay is powered and car can start. If it will start in manual mode but not automatic then something is being misread or has a missing signal.
Almost impossible to diagnose remotely, but MultiECUScan (with the correct cable) can read all gearbox values, which will point towards whatever is not working correctly.
Not sure if this is helpful or not, but good luck with fixing it.

Many thanks for your reply it is most helpful and I will look to get the mutliECU scan. I havent been able to fully check the reservoir to see if it is empty or full. Is there an easy way to access it and check its levels. Is it just gearbox oil or a special oil??

 

[irc]

Thank you so muc

Many thanks for your reply it is most helpful and I will look to get the mutliECU scan. I havent been able to fully check the reservoir to see if it is empty or full. Is there an easy way to access it and check its levels. Is it just gearbox oil or a special oil??

It is Tutela CS-Speed. Do not fill with gearbox oil as it will pop seals and cause real damage.
Should be available from Fiat dealers. However, the system is sealed and the level should not drop significantly. The exceptions are:
A) Failed Accumulator - easy fix, and requires a top-up to replace the fluid left in the failed accumulator when removed.
B) Internal or external leak - bad news, as seals are hard to find, and real expertise is rare.

Some "experts" will tell you to top up the fluid, or even to drain it and refill. However, it is a sealed system, and should not need any additional fluid except after renewal of accumulator.

Some people just top up the fluid and off-load the car to some unsuspecting punter, which is one reason Dualogics have a bad reputation. The units are actually quite simple and very reliable, if used as intended. Versions of it were used in a number of cars, from Alfa Romeos to Ferrari, Maseratis and others.
Sadly, many are not used as intended (the simple instructions are in the manual, but are often ignored) which leads to premature clutch wear, unhappy owners and a bad reputation. And a wealth of "experts" who usually make things considerably worse with bad advice.

It is definitely possible that your problem is electrical, and can be fixed easily (have you checked the brake light switch and associated wiring?), so please don't do anything with fluid at this point.

 

[jackwhoo]

Thank you so muc

Many thanks for your reply it is most helpful and I will look to get the mutliECU scan. I havent been able to fully check the reservoir to see if it is empty or full. Is there an easy way to access it and check its levels. Is it just gearbox oil or a special oil??

Selespeed fluid only

 

[Dougsolv]

It is Tutela CS-Speed. Do not fill with gearbox oil as it will pop seals and cause real damage.
Should be available from Fiat dealers. However, the system is sealed and the level should not drop significantly. The exceptions are:
A) Failed Accumulator - easy fix, and requires a top-up to replace the fluid left in the failed accumulator when removed.
B) Internal or external leak - bad news, as seals are hard to find, and real expertise is rare.

Some "experts" will tell you to top up the fluid, or even to drain it and refill. However, it is a sealed system, and should not need any additional fluid except after renewal of accumulator.

Some people just top up the fluid and off-load the car to some unsuspecting punter, which is one reason Dualogics have a bad reputation. The units are actually quite simple and very reliable, if used as intended. Versions of it were used in a number of cars, from Alfa Romeos to Ferrari, Maseratis and others.
Sadly, many are not used as intended (the simple instructions are in the manual, but are often ignored) which leads to premature clutch wear, unhappy owners and a bad reputation. And a wealth of "experts" who usually make things considerably worse with bad advice.

It is definitely possible that your problem is electrical, and can be fixed easily (have you checked the brake light switch and associated wiring?), so please don't do anything with fluid at this point.

I must say your help is brilliant so thank you. I did check brake lights and they are normal. I had a friend around with diagnostic tool he borrowed from his garage which brought up the sensor faults I stated earlier p2fc P1741 and P1742. Apparently to do with the gearbox and autochange.