VStar - I've noticed something: On my 2013 Rogue AWD if I hit the L button at like 40 mph, the OD goes off and revs go real high (like putting a MT in 2nd gear from 4th). But on our 2017 Quest if I do the same thing it seems to recognize the current road speed and compensates somehow by adjusting the RPM and matching it to road speed (it doesn't over-rev). I assume its part of an improved design or CVT firmware on the newer Jatco?VStar650CL wrote: ↑Thu Oct 14, 2021 4:31 pmYes, it's fine to use Low range on a CVT just as you would on a conventional A/T. The only difference is that the CVT is being locked into the lower range by software and not a mechanical gearset.
The gen1 Rogue TCM software was among the first ever used by Nissan, and some aspects of it were pretty primitive by later standards. It isn't exactly Jatco, either -- Hitachi makes the TCM hardware and also writes the firmware to a spec produced jointly by Nissan and Jatco. So when there's a fly in the soup, it's usually impossible to determine which of the 3 chefs let it land there.phmichel wrote: ↑Sat Oct 16, 2021 10:31 amVStar - I've noticed something: On my 2013 Rogue AWD if I hit the L button at like 40 mph, the OD goes off and revs go real high (like putting a MT in 2nd gear from 4th). But on our 2017 Quest if I do the same thing it seems to recognize the current road speed and compensates somehow by adjusting the RPM and matching it to road speed (it doesn't over-rev). I assume its part of an improved design or CVT firmware on the newer Jatco?
Ha! Well said. It's not really a "fly in the soup", just an observation.VStar650CL wrote: ↑Sun Oct 17, 2021 5:46 amThe gen1 Rogue TCM software was among the first ever used by Nissan, and some aspects of it were pretty primitive by later standards. It isn't exactly Jatco, either -- Hitachi makes the TCM hardware and also writes the firmware to a spec produced jointly by Nissan and Jatco. So when there's a fly in the soup, it's usually impossible to determine which of the 3 chefs let it land there.phmichel wrote: ↑Sat Oct 16, 2021 10:31 amVStar - I've noticed something: On my 2013 Rogue AWD if I hit the L button at like 40 mph, the OD goes off and revs go real high (like putting a MT in 2nd gear from 4th). But on our 2017 Quest if I do the same thing it seems to recognize the current road speed and compensates somehow by adjusting the RPM and matching it to road speed (it doesn't over-rev). I assume its part of an improved design or CVT firmware on the newer Jatco?
That could be judder. If it is, the TCM will have detected it and you'll have a P17F1 or P17F0 stored. It could also be a loud or balky stepper motor in the CVT, a balky TC sprag-clutch, or something that isn't the CVT at all like a leaky active motor mount. Get it scanned with a trans-capable scanner and see what's in there.RonBranam12 wrote: ↑Sun Oct 17, 2021 7:44 pmA little off subject but...
Now that I've been driving around town, I've noticed a noise. When first accelerating (usually after backing up, but not always) and when decelerating into what I believe to be the last downshift, I hear what sounds like a belt slipping. Not a high-pitched squeal like fan belt, more like a burp. Both of these are sometimes, not all times. Any thoughts?
I don't like the sound of that. Pun intended. I think it's time I took this info. to my mechanic. I hope he won't mind it came from the internet. BTW: Will the ELM 327 I received in the mail today show this?VStar650CL wrote: ↑Sun Oct 17, 2021 8:09 pmThat could be judder. If it is, the TCM will have detected it and you'll have a P17F1 or P17F0 stored. It could also be a loud or balky stepper motor in the CVT, a balky TC sprag-clutch, or something that isn't the CVT at all like a leaky active motor mount. Get it scanned with a trans-capable scanner and see what's in there.