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Old 05-03-2018   #1
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Question Dualogic automatic mode will not engage

I have a 2007 FIAT 1.4L Petrol with a automatic duallogic gearbox in Melbourne, Australia.

This gearbox has been very annoying for a while now. One day two weeks ago it just wouldn't engage the automatic mode after I turned the car on so I called FIAT and made an appointment for them to look at it.

Then a week later, it resolved itself and the automatic mode would work again but this week it stopped working again.

Car drives fine in manual mode with no obvious issues that I can see. It is just extremely annoying driving a sequential manual. There are no warning lights or anything that I can see anywhere. As far as I can tell the car drives fine but just won't engage the automatic mode.

Has anyone experienced this similar issue? Was it successfully resolved? What was the resolution?

I am very reluctant to deal with FIAT without having a little more info hence posting here. I hear they are notoriously expensive to fix, i guess given the rarity. I bought this second hand for cheap and not too keen on spending a fortune.
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Old 05-03-2018   #2
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Re: Dualogic automatic mode will not engage

Hi ... Who ?

since you say it's not engaging in Auto Mode but works ok in Manual, I would suspect the Hall-effect sensors in the gear/mode selector ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
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Old 09-08-2018   #3
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Re: Dualogic automatic mode will not engage

mine, 11yo car. no auto mode
all totally manual whether shift up or down, need to do manually. if left at gear 4 when slowing down, it won't auto**** diwn. the car will jerking and eventually dies. had to shift down manually.
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Old 09-08-2018   #4
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Re: Dualogic automatic mode will not engage

There is a 4 bits message sent from the selector lever to the dualogic controller that reports the levers's position. The signal is elaborated thru a diode matrix out from 7 Hall-effect sensors. There is a true table that can be used to measure if the correct bit is sent for every lever position.
I already sent this table ans schematics to other posters, do a search on Dualogic and you'll find the threads…
BRs, Bernie

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Old 09-08-2018   #5
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Re: Dualogic automatic mode will not engage

There is a 4 bits message sent from the selector lever to the dualogic controller that reports the lever's position. The signal is elaborated thru a diode matrix out from 7 Hall-effect sensors. There is a true table that can be used to measure if the correct bit is sent for every lever position.
I already sent this table and schematics to other posters, do a search on Dualogic and you'll find the threads…
BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
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Last edited by Bernievarian; 09-08-2018 at 14:14.
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Old 10-08-2018   #6
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Re: Dualogic automatic mode will not engage

Quote Originally Posted by Bernievarian View Post
There is a 4 bits message sent from the selector lever to the dualogic controller that reports the lever's position. The signal is elaborated thru a diode matrix out from 7 Hall-effect sensors. There is a true table that can be used to measure if the correct bit is sent for every lever position.
I already sent this table and schematics to other posters, do a search on Dualogic and you'll find the threads…
BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
thanks Bernievarian

is this repairable DIY? have you DIY it, change the hall sensor or the diode?
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Old 10-08-2018   #7
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Re: Dualogic automatic mode will not engage

Hi Ahhl,

unfortunately I haven't done it myself and I Don't even know if one can open the shell to explore the inner parts, BTW probably not available from Fiat (st)dealers. The method given in the manuals is there to tell if the issue comes from the lever or not …

Have sent you a PM about your Italian manual…

BRs, Bernie
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Old 15-08-2018   #8
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Re: Dualogic automatic mode will not engage

few days ago, the car suddenly can only engaged odd gears. no error on the display. nothing but can only engaged odd gears.

no other choice, i get myself to friendly frequented fiat workshop.

he also puzzled but he didn't think its the sensors problem as if its is the sensor problem, the display should have show an error.

anyway he hookup to MES and the error shows as pump leaking, pump tank empty error. but no such thing happened. oil still there.

after a while he performed a reset to the selespeed end of line procedure. the pump initially hesitant to engage 2,4 gears but the after awhile it managed to reset the gear.

he believe its the pump/actuator issue that might need to be replaced. anyway that actuator was a second hand one 4 years ago. i think i might need to replace to a brand new one as might not able to get second hand one anymore.

free of charge, told to tried it first
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Last edited by ahhl; 15-08-2018 at 15:23.
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Old 15-08-2018   #9
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Re: Dualogic automatic mode will not engage

Seems one valve isn't working properly and the selector stays only in 'odd gears' position.
More likely not related to a pump issue; personnaly I would remove it from the box and open it to check what's wrong, it's not rocket science and you Don't even need any special tooling, beside E-sockets (maybe) …

Good luck tho, BRs, Bernie
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