DQS not working on downshifts

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@Jolly Roger V4

At least in my case I don't think so. It was about 50F and during my last test ride I didn't have the fairings on so I'm pretty confident it was cool and that was just street riding.

Were your QS problems with up or down shifting?
 
Prior to my dealer visit in which the problem first started, I'd only have problems on the upshifts. Typical new bike stuff. Once I got above 500 miles the upshifts got a lot better and during that 0-500mi period downshifts were always fine.

Now, the QS issues are only on the downshift.

Did you take your bike to the dealer? Did they do any software/firmware updates?
 
Not yet. Waiting for maintenance time. Last thing I need is to leave it for a month and nothing happens. They might swap the QS module hopefully. Still smell a burning
smell like rubber.plastic after a track session. Something is getting hot for sure!
 
I have the same issue with my 2021 V2. Sometimes the QS won't downshift. It always upshifts. If the downshift fails (I can try over and over but it won't work) and then I give it a bit of throttle and try the downshift again, then it works. Also, after you give it throttle to fix the downshift then it keeps working (meaning you can go from 5 to 5 with a failed downshift, then give throttle and make it go from 5 to 4, then normal downshifts work from 4 to 3 to 2 to 1 without giving it throttle).

I thought it was my QS since I have reverse-shifted my V2 (which is not really designed for that with stock rear sets and QS - you have to grind down some linkage). I also have an SLR tune. I figured an aftermarket QS would solve the problem, but this post has me thinking otherwise. :(

I think my handheld flash unit can read the TPS, so maybe I'll see if it thinks there is something wrong. I would imagine that it would need to read the TPS during a failed downshift rather than while sitting in the garage.
 
@0260n25 I'm very curious if your SLR can see the following values since I wanted to try a SLR tune after I get the full Akrapovic system going.

Below is the OBD CAN channels the V4 has. I'd think the V2 is very similar. Note the ShiftSw, I think you could monitor that one when using the QS to see if the ECU is getting the signal from the QS. If it is, and the ECU is ignoring the request, some other sensor is interfering. If Twist grip doesn't show a closed value, the ECU will ignore the shift request...for example.

1639427647241.png

1639427663004.png


Reference: https://www.aimtechnologies.com/support/stockecu/Ducati_PanigaleV4_100_eng.pdf
 
Last edited:
bp_SFV4 said:
@0260n25 I'm very curious if your SLR can see the following values since I wanted to try a SLR tune after I get the full Akrapovic system going.

Below is the OBD CAN channels the V4 has. I'd think the V2 is very similar. Note the ShiftSw, I think you could monitor that one when using the QS to see if the ECU is getting the signal from the QS. If it is, and the ECU is ignoring the request, some other sensor is interfering. If Twist grip doesn't show a closed value, the ECU will ignore the shift request...for example.



Reference: https://www.aimtechnologies.com/support/stockecu/Ducati_PanigaleV4_100_eng.pdf
Click to expand...

I just checked my SLR handheld again tonight. It can reset TPS and error codes, and it can flash the ECU, but that is it. My REXXER handheld can read the TPS and a few other functions on my Cafe racer. I am happy with the tune from SLR, but the handheld is a bit disappointing (other than the ability to flash to and from stock).

Basic REXXER TPS:
IMG_20200905_094753.jpg


-0260
 
Considering the only reason I would want it now is to read the CAN bus $650 is a bit steep. I'm surprised there isn't a simple tool available.
 
Okay unfortunately I also seem to have caught the downshift blipper herpes that many of you have been struggling with.

Here's the background: 2018 track bike with SLR tune and stock quick shifter. Never had a problem with downshifts till yesterday in Houston - ambient temperature was around 65.

Second session of the morning I noticed Up shifts always worked fine but downshifts were pretty random. pitted out and checked and lo and behold my shift lever had loosened and almost fallen off my rear set.

Reloctited and reinstalled it but it did not help the problem.

I then opened the sensor itself checked all wiring, cleaned it out, heat wrapped the sensor but it did not help the problem. Downshifts are still pretty random.

I have not reset my TPS yet and will do that. I have not removed the throttle spacers I installed a long time ago and will test that as well.

I am strongly suspecting that it's got something to do with throttle position sensor or gear position sensor since my entire problem started after the shift lever had become loose and was flopping around.
 
For some reason we tried to install the stock gearing, sprocket front and rear, and somewhat took out the gremlins, but i am still hoping for a better solution since I can’t commit it will always work during sessions.
 
Martini said:
For some reason we tried to install the stock gearing, sprocket front and rear, and somewhat took out the gremlins, but i am still hoping for a better solution since I can’t commit it will always work during sessions.
Click to expand...
Okay that is extremely interesting because right before this track day I went to a 15 tooth front sprocket (down from the stock 16) Why would a gearing change affect shifter sensor??
 

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