Hi All,
I have a Nissan Pathfinder R51 2013 2.5l Diesel Auto
In Aug 2021 while on the beach i had my Pathfinder in 4Low and manual mode. The transmission (in manual mode) kept changing up gears at approx 2200-2300 rpm. At the time I figured this was normal and must have been a protection setting (Novice 4wd'er)
In Oct 2021 I did a 2day 4wd course with a professional company in Perth. Using my own vehicle. The first day was in sand and the next in the bush.
The first day was in the sand, I engaged 4wd low and used manual mode. I noticed that the gears would change up automatically at approx 2200-2300 rpm. This would happen while working through soft flat sand and on big inclines.
The second day was in bush terrain.
Again in 4wd low and manual mode when doing climbs under load and in sports mode the Pathfinder would up gear by its self at the revs mentioned above. Although It didn't do it on level ground or downhill, I suspect due to having more traction in this terrain.
I was out with 13 other 4wds and everyone said this is weird behaviour when manual mode is selected.
A few weeks later the Mechanic found fault code P1815 M-MODE Switch registered in the computer error codes - we cleared the fault codes during the scheduled service
On the weekend just past I took the pathfinder back to the sand dunes to test it out
We tested the vehicle is very soft sand and slight incline and manual mode kept shifting upgear manually at approx. 2200rpm
This time recorded on video!
https://www.dropbox.com/s/3d0922dryx6co ... 7.mp4?dl=0
I took it into an local transmission mechanic and they took it for a drive and manual mode works fine in 2WD, he kindly hooked up the device to look for fault codes and no fault codes were present
I'm a bit lost at where to go from here, its quite frustrating to not have 4LO manual mode to climb dunes or work through really soft sand on the beach.
Any advise or suggestions would be greatly appreciated
Thanks
Nick