J12 Start stop power surge

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xaote
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Qashqai Model: Mk.3 Qashqai - J12 (2021+) New Model

Post by xaote »

Are there any other xtronic owners having occasional problems with what I'm guessing is the start stop system?
It feels like the engine is shutting down just before the car has come to a complete stop so the engine restarts again with a little burst of power. It doesn't happen every time.
I spoke to the dealership about it but they weren't aware of the problem.
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ophidian
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Post by ophidian »

Yes, sometimes. But I have feeling that it is pretty sensitive to conditions.
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MikeGC
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Qashqai Model: Mk.3 Qashqai - J12 (2021+) New Model

Post by MikeGC »

I have experienced some sort of power surge after coming to a halt. Only seems to happen with stop/start turned on (happened with the J11b as well, by the way)
Feels like a software thing to me
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DaveCat
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Post by DaveCat »

xaote wrote: Tue Jun 07, 2022 11:20 am Are there any other xtronic owners having occasional problems with what I'm guessing is the start stop system?
It feels like the engine is shutting down just before the car has come to a complete stop so the engine restarts again with a little burst of power. It doesn't happen every time.
I spoke to the dealership about it but they weren't aware of the problem.
Yes. Engine sometimes stops during start of braking, then restarts before coming to a complete halt, thus meaning more brake pressure has to be applied. Think the start / stop indicator shows as unavailable when the engine restarts.
Please could you detail exactly what happens for you? I have a senior manager contact on Linkedin, and the more corroborating evidence I have the better.
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DaveCat
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Post by DaveCat »

ophidian wrote: Tue Jun 07, 2022 11:34 am Yes, sometimes. But I have feeling that it is pretty sensitive to conditions.
I agree. Happened all the time at one point (short urban drives), but not for a few (longer rural) trips now.
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calnorth
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Post by calnorth »

One thing is definite ref Stop/Start...the engine "must not be stopped" (or started) when the vehicle (MT type) is rolling. A sensor specifically monitors speed.

The decision to stop or start is determined by the ECU based on a number of different sensor inputs. Nissan need to solve the problem..Fast.
Last edited by calnorth on Wed Jun 08, 2022 11:05 am, edited 1 time in total.
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srbqashqai
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Post by srbqashqai »

I confirm that I experianced the same problem on my J12 xtronic Tekna.
Last edited by srbqashqai on Wed Jun 08, 2022 8:54 am, edited 1 time in total.
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gloucester
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Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by gloucester »

calnorth wrote: Wed Jun 08, 2022 7:53 am
One thing is definite ref Stop/Start...the engine "must not be stopped" (or started) when the vehicle is rolling. A sensor specifically monitors speed.

Is that confirmed for the J12 since I presume your experience is only on the J11B?

One of the things that surprised me when I switched to the Ignis is that Stop/Start actuates before you come to a complete halt - might be the same on the J12?
(2015 Nissan Qashqai Tekna DIG-T 1.2 sold 15/6/18) ~ 2018 Suzuki Ignis SZ5 - 2018 Yamaha MT-07 ~ (2024 Volvo EX30 ordered)
QaiFan
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Post by QaiFan »

I guess this only occurs in the xtronic versions, since I can not recall this early engine cut-off happening with my J12 MT6 !?
ophidian
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Post by ophidian »

I made an experiment yesterday. I will report later when I will have time to write all. But it is consistent and predictable behaviour and I find it usable.
April '22 - J12 1.3DIG-T 160 CVT Tekna+ with all wheel drive - Blue/Black
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