Too high RPM

Non-Technical Nissan QashQai chat. Mk2, Mk3
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SGear
Posts: 1
Joined: Sun Jun 26, 2022 4:57 pm
Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by SGear »

Nissan Qashqai 1,2l petrol, 85kw, automatic 2016m. About a month ago gearbox started working weird. When engine reaches working temperature and I drive a little longer on highway car starts turning Ds on and off. RPM varies from 2000 to 2500. If I turn manual gear shifting on and shift to 7th, for a second or two RPM drops but then again Ds turns on. It's as if computer doesn't understand which gear is the best on higher speed. But when I'm driving in town everything is ok, only on highway speed gear box starts fooling.

Is there something wrong with main computer? Gears shift smoothly, without any noise.

Maybe there is something wrong with the engine? If compression or something else is not right, computer notices loss in power, turns on Ds to compensate that loss.

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calnorth
Posts: 2719
Joined: Mon Feb 11, 2019 2:01 pm
Qashqai Model: Mk.2 Qashqai Facelift - J11b (2017–2021)

Post by calnorth »

Its pretty much impossible to diagnose this behavior. There are about 7 sensors involved plus the TCM (Track Control Module) and ECU. The comms between these items is direct wiring and for the ECU is via the CAN Bus. Not forgetting power control (IPDM) module for most of the functions.

Much of the above controls what you'd expect and the electro/mech Control Valves within the gearbox itself.

I'd have to say this needs to be examined by specialists.
Mk2 Qashqai Facelift - J11b (2017–and onward)
1.6 Dig-T N-Connecta
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gloucester
Posts: 5173
Joined: Sun Apr 03, 2016 7:04 am
Location: Gloucestershire, England
Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by gloucester »

Welcome to this forum.

Can't add anything. Let's see if an auto owner can help.
(2015 Nissan Qashqai Tekna DIG-T 1.2 sold 15/6/18) ~ 2018 Suzuki Ignis SZ5 - 2018 Yamaha MT-07 ~ (2024 Volvo EX30 ordered)
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