All Things Mk5 > How to Guides / Troubleshooting
DSG hesitating on downshift
LouCyffer:
Any ideas, guys?
I'm getting an intermittent hesitation when shifting down from 4th to 2nd. Road speed 30mph, slowing & approaching a junction or similar. Downshift on the paddles with a double click to 2nd. Often this will be no problem, but over the last couple of weeks I've sometimes found I'm waiting 1-2 seconds for the box to engage 2nd.
It's a bit of an issue when I'm swinging out of a junction or onto a roundabout.
Car is due an MOT on wednesday, & under warranty for a few more days (will extend it anyway). So I'll ask the stealer to have a look. I'll check VCDS this afternoon when I'm washing it.
In the meantime, any bright ideas?
Saint Steve:
Is your car a 57/08 car lou?
Have you had the dsg box serviced yet?
You have vcds? perhaps its worth doing basic settings of the dsg if you do.Although ive never tried it.Perhaps maybe an error with the downshift paddle? although vcds will show an error if there is.
Or ask your dealer whilst in to investigate whilst your factory warrantys still valid?
182_blue:
See what VCDS says, you could try a reset as you have VCDS http://wiki.ross-tech.com/wiki/index.php/6-Speed_Direct_Shift_Gearbox_%28DSG/02E%29
see what effect that has
RedRobin:
--- Quote from: LouCyffer on January 17, 2011, 08:58:00 am ---
Downshift on the paddles with a double click to 2nd. Often this will be no problem, but over the last couple of weeks I've sometimes found I'm waiting 1-2 seconds for the box to engage 2nd.
--- End quote ---
....Although you can double click to shift down 2 gears, the DSG box always has only one gear in instant readiness either side of that you're already in. So if you're in 4th the box will have 3rd and 5th simultaneously ready for your selection but not 2nd. By double clicking quickly you are forcing the action and I'm not surprised it's hesitant whether intermittently or regularly.
My advice would be to break your habit rather than possibly risk longer term stress on your DSG. Besides which, it's not a habit which is kind to your engine revs either. If you must do it, and I have done so several times myself but only in emergencies and usually 5th to 3rd, then let the box briefly select and engage 3rd en route from 4th to 2nd.
You also need to take into account what your right foot is doing during such double click shifts. Keep it all smooooth.
vRS Carl:
--- Quote from: RedRobin on January 17, 2011, 09:14:09 am ---....Although you can double click to shift down 2 gears, the DSG box always has only one gear in instant readiness either side of that you're already in. So if you're in 4th the box will have 3rd and 5th simultaneously ready for your selection but not 2nd. By double clicking quickly you are forcing the action and I'm not surprised it's hesitant whether intermittently or regularly.
My advice would be to break your habit rather than possibly risk longer term stress on your DSG. Besides which, it's not a habit which is kind to your engine revs either. If you must do it, and I have done so several times myself but only in emergencies and usually 5th to 3rd, then let the box briefly select and engage 3rd en route from 4th to 2nd.
You also need to take into account what your right foot is doing during such double click shifts. Keep at all smooooth.
--- End quote ---
Not quite true that Robin,
The DSG has two clutches. One that does even gears and one that does Odd.
So if you are in 3rd then it has 4th ready to select. If you they try to gear down it will take fractionally longer as it has to stop having 4th ready and move to 2nd.
--- Quote from: VW ---Two independent gearbox units make up the DSG. With dual-clutch technology - two clutches in a common housing - both gearboxes are connected under load to the engine in turn, depending on the current gear, via two drive shafts. Clutch 1 serves the first gearbox unit with 1st, 3rd, 5th 7th and reverse gear and clutch 2 the second gearbox unit with 2nd, 4th and 6th gear. An output shaft that applies the torque to the driven wheels via the differential gear is assigned to each gearbox unit.
--- End quote ---
--- Quote from: VW ---Split-second gear changes
When one gear is engaged, another gear is always preselected. Within four hundredths of a second after the system detects a gear change it opens one clutch and closes the other. The mechatronics unit ensures that this takes place fast and to a level of accuracy that would not be possible in a manual transmission. The change of gear is imperceptible to the driver who is merely conscious of the uninterrupted power.
--- End quote ---
Lou i think the problem for you is (which isn't a problem as such) that you are going from 4th to 2nd which is controlled by the same clutch so it has to disengage 4th and select second which is probably the hesitation you are feeling.
Plenty of info here (which is where i took the quotes from)
http://www.volkswagen.co.uk/technology/transmissions-and-drivetrains/dsg
If it is taking longer than normal then as Steve has alluded too it may be the Mechatronics unit playing up
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