DQS not working on downshifts

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I did a tire calibration on my V2 but the failed downshifts continue. I reset the TPS and then did a tire calibration and still had many failed downshifts. Maybe I'll remove my SLR flash and try it again. Other than going back to stock shifting and stock gears (for testing), I am at a loss.
 
0260n25 said:
I did a tire calibration on my V2 but the failed downshifts continue. I reset the TPS and then did a tire calibration and still had many failed downshifts. Maybe I'll remove my SLR flash and try it again. Other than going back to stock shifting and stock gears (for testing), I am at a loss.
Click to expand...
Tire Calibration is not intuitive. Did you start in second gear and ride at 28-31 till it said complete? First few times i attempted it I didn't do it right.
 
I REALLY suggest setting the tire calibration to default just before to doing the calibration. Then start off in second gear and hold about 30mph.
 
Last edited:
bp_SFV4 said:
I REALLY suggest setting the tire calibration to default just before to doing the calibration. Then start off in second gear and hold about 30mph.
Click to expand...
Oh, I didn't see the "default" option. I'll try your suggestion. Thanks.
 
Happy to report DQS continues to work well. Did a full day yesterday (7 sessions) and it didn't skip a beat.

However, I will be going back to my original gearing so I will re-do the tire calibration routine again.......
 
I went back to my 15T front sprocket yesterday. Set the tire calibration to default after then did the tire calibration. No QS issues to report.
 
bp_SFV4 said:
I went back to my 15T front sprocket yesterday. Set the tire calibration to default after then did the tire calibration. No QS issues to report.
Click to expand...

Where is the default setting again? I don't remember seeing it. I know where to initiate a new tire calibration and put it in 2nd gear and keep riding till it says done...
 
On the 2021 Panigale V4 when you go into the settings menu and select Tire Calibration, you get Start and Default. To select start or reset you’d select the appropriate menu item and hold enter for 15 seconds or so.

With the OBDStar I can see the BBS is storing different values but they are hex and not very useful.
 
Update on MY21 V2 (fixed):
  • Calibration set to Default - QS downshift issues remain
  • Calibration performed after default - QS downshift issues remain
  • Calibration performed in second gear - QS downshift issues remain
  • Previous three steps tried again with bike reboot after each step - QS downshift issues remain
  • Restored QS to OEM/Standard shifting (was GP shift) - QS downshift issues remain
  • Restored QS to OEM/Standard shifting and performed first three calibration steps - QS downshift issues remain
  • Restored QS to OEM/Standard shifting and set shifter wires back to OEM (had them reversed for GP shifting) - QS downshift issues remain
  • Restored QS to OEM/Standard shifting and set shifter wires back to OEM and performed first three calibration steps - QS downshift issues remain
  • Restored ECU flash to OEM (had SLR flash) - QS downshift issues remain
  • Restored ECU flash to OEM (had SLR flash) and performed first three calibration steps - QS downshift issues remain
  • Restored back to SLR flash - QS downshift issues remain
  • Restored 44t rear sprocket to OEM 43t and 14t front sprocket to OEM 15t - QS downshift issues FIXED (Did NOT perform tire calibration)
    • SUPERLITE quick change carrier, flange, Ti bolts/nuts, cush drives, and D.I.D. Raven chain remained installed
  • Restored QS to GP/Reverse shift - QS downshift issue remained fixed
  • Restored front sprocket to 14t (OEM is 15t) - QS downshift issue remained fixed
I am not sure why the QS is still working after putting the 14t back on the front. My issues started with the 14t and I did not have the 44t rear at that time (was still OEM in the rear). I am at a loss for why the bike started working with OEM gearing and WITHOUT a tire calibration and remains working with a -1 front sprocket. :rolleyes: I will try the 44t rear with the -1 front when I get a chance. This kinda sucks. Glad it is working, but not sure why it stopped in the first place or when it might start again.

-0260
 
0260n25 said:
Update on MY21 V2 (fixed):
  • Calibration set to Default - QS downshift issues remain
  • Calibration performed after default - QS downshift issues remain
  • Calibration performed in second gear - QS downshift issues remain
  • Previous three steps tried again with bike reboot after each step - QS downshift issues remain
  • Restored QS to OEM/Standard shifting (was GP shift) - QS downshift issues remain
  • Restored QS to OEM/Standard shifting and performed first three calibration steps - QS downshift issues remain
  • Restored QS to OEM/Standard shifting and set shifter wires back to OEM (had them reversed for GP shifting) - QS downshift issues remain
  • Restored QS to OEM/Standard shifting and set shifter wires back to OEM and performed first three calibration steps - QS downshift issues remain
  • Restored ECU flash to OEM (had SLR flash) - QS downshift issues remain
  • Restored ECU flash to OEM (had SLR flash) and performed first three calibration steps - QS downshift issues remain
  • Restored back to SLR flash - QS downshift issues remain
  • Restored 44t rear sprocket to OEM 43t and 14t front sprocket to OEM 15t - QS downshift issues FIXED (Did NOT perform tire calibration)
    • SUPERLITE quick change carrier, flange, Ti bolts/nuts, cush drives, and D.I.D. Raven chain remained installed
  • Restored QS to GP/Reverse shift - QS downshift issue remained fixed
  • Restored front sprocket to 14t (OEM is 15t) - QS downshift issue remained fixed
I am not sure why the QS is still working after putting the 14t back on the front. My issues started with the 14t and I did not have the 44t rear at that time (was still OEM in the rear). I am at a loss for why the bike started working with OEM gearing and WITHOUT a tire calibration and remains working with a -1 front sprocket. :rolleyes: I will try the 44t rear with the -1 front when I get a chance. This kinda sucks. Glad it is working, but not sure why it stopped in the first place or when it might start again.

-0260
Click to expand...

Interesting. Seems your bike is particularly sensitive to rear sprocket change. However, going from 15 to 14 in front is a much more drastic gearing change than going from 43 to 44 in rear, so that hypothesis isn't very strong to be honest.
 
TomFoolery said:
Interesting. Seems your bike is particularly sensitive to rear sprocket change. However, going from 15 to 14 in front is a much more drastic gearing change than going from 43 to 44 in rear, so that hypothesis isn't very strong to be honest.
Click to expand...

Well, my issues started when I went to a -1 in the front and still had the OEM in the rear, so I don't think it is the +1 (44t) in the rear. I will give the +1 front and +1 rear a try again when I get the energy to mess with it. Honestly, this is a really jacked-up issue. Oh, and I still have my throttle spacers installed (never had QS issues with spacers when gearing was OEM nor with my current +1 front). I am tired of working on this thing. :confused:

NOTE: +1 front and +1 rear is reallllllly fun around town!
 
Another update (broken)

I wanted to put the plastics back on the bike but I decided to take it out for another test run first. Most of the 30-minute ride was perfect, but towards the end, the QS started acting up again. :rolleyes: I guess I'll put the OEM front sprocket back on the bike and give it longer tests.

Maybe it is just a bad QS unit. https://www.ducati.ms/threads/dqs-not-downshifting.729247/
 
The OP's post in that thread you linked has some problems. The DQS is completely unaware of the TPS. They don't talk to each other. All the DQS does is send a voltage to the ECU. This voltage tells the ECU if the QS is at rest, requesting a downshift or requesting an upshift.

For some reason the ECU is ignoring the downshift request.

Also, on the V4...maybe the V2, I don't think the throttle grip position is the TPS but rather TPS measures the butterfly position. Which makes sense since all the low/high/med engine maps change the relationship of the throttle with the butterfly and fuel. I'd also guess the TPS would work with EBC since its position effects engine braking.

With the OBDStar I can see the values the TPS sensor is sending the ECU and with the bike off, you can twist the throttle and the TPS value won't change. There is another value called "twist grip %" or something to that effect that directly correlates to the throttle.

You can also see the voltage the QS is sending to the ECU which makes it easy to rule out if the actual QS is bad.
 
0260n25 said:
Another update (broken)

I wanted to put the plastics back on the bike but I decided to take it out for another test run first. Most of the 30-minute ride was perfect, but towards the end, the QS started acting up again. :rolleyes: I guess I'll put the OEM front sprocket back on the bike and give it longer tests.

Maybe it is just a bad QS unit. https://www.ducati.ms/threads/dqs-not-downshifting.729247/
Click to expand...

At this point given all the angles you have eliminated to observe seemingly inconsistent behavior, I would just buy a new sensor.
 
The TPS is the middle man between the APS and the throttle body servo. The TPS takes the input from the APS and sends it to the throttle body servo. The throttle % I believe is the association between what the APS is mechanically doing and how that translates to action of the throttle body servo (customizable throttle mapping).
 
I'll have to play with my TPS when I get home. :p

If APS is the actual twist grip sensor which sends a signal to the ECU, I think it gets interpreted as a torque requested value which you can also see. I wonder if the torque requested value is something that changes with the engine mapping. So if you're in low, a 50% grip position has associated with it a 30% torque requested whereas in high, 50% is 50%, or something like that.
 
The stock quickshifter is not much money (£82 in the UK).

Mine played up twice, I swapped it out for a replacement, and all OK.

I carry a spare with me!
 

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