Technical Dual Logic Gearbox Fail

Currently reading:
Technical Dual Logic Gearbox Fail

NumanR,

Thanks for the info.

Does the fact that the error only came up the once, and hasn't recurred since, suggest that it was an electrical (circuit) fault rather than a true gearbox fault? If there was a fault with the hydraulic pressure wouldn't it keep failing?

All hypothetical I suppose until the dealer manages to do the checks.

Think I'll go back to them with T14086's recommendations for action and your suggestions as to the cause.

Cheers.
 
I keep it on manual all the time ( dualogic). I always get errors when I try to shift too quickly on low RPMs. I guess the system realizes there is not enough rpms needed to shift to the next gear.


Does it happen to anybody else, that sometimes the gear doesnt want to shift when I floor it on the automatic? maybe I drive weird.. :cool:
 
The orange warning light and chime when shifting at too low revs is an advisory to tell you that the gear change is not possible. This is to stop you potentially damaging the box. Try doing a change down from 5th all the way down to 2nd at 70mph and you will get the same thing.

The red warning sign myself and "hmm" have experienced may indicate a fault with the box but in my case as the rev counter also dies at the same time and operating the screen washers restores everything to normal I'm on the hunt of a so far elusive bad earth!

Incidentally mine "kicks down" nicely as I recently found out on the M5 when passing a truck. The shift from 5th to 4th was just at the right moment. I drive mine mainly in auto except for twisty A roads where the manual downshifts are a delight to do.


regards

Ian
 
Last edited:
Thanks for the Reply Ian,

I drove an old Automatic Accord for a long time, the car would'nt shift unles I eased my foot from the pedal, maybe I try to do the same thing. My mom never has a problem becase she drives slower (and nicer), shifts as expected.

I drove it on mountain roads for a long trip and I have realised keeping it in the manual is alot safer.

Butch
 
The very very slightest lifting off the throttle on up changes helps. Just think what you do subconciously with a manual. After a while you don't even realise you are doing it.

What I have found is that if you do a manual down change when in auto mode the box will then hold the gear when you speed up again until it reach close to the previous road speed you were at.

It's a clever bit of technology and wish Fiat would open up a bit and tell us more about what parameters influence the gear selection for a given set of road circumstances.
 
Back
Top