Originally Posted by Sti_mulus
How do we know if we have Intelligent Variable Torque Management™ (i-VTM4™) AWD System equipped?
I think this might be the answer to some of us only spinning the front wheels when stuck.
Huh? Did you buy the AWD version? If you rented, borrowed, or stole it, look for the AWD badge on the back, a rear differential under the back end, and a driveshaft running the length of the vehicle.
BS aside, according to Honda, in some traction modes it is normal for the rear wheels not
to spin when they don't have traction. I don't fully understand this, and I can't seem to find where I read it, but I think it is related to the traction control/VSA system. That seems to be more intrusive than it was on other VTM-4 vehicles I have owned.
It sounds like "snow mode" with VSA off is the best combination for getting unstuck in snow, but leaving VSA off may not be a good choice at highway speeds.
Whether the AWD is working as it should is a different question than whether it is equipped, but I guess it isn't as simple as looking for rear wheel spin. There is supposed to be an AWD warning light on the dash if the system shuts down due to overheating or other failure. I don't think there is any way for the driver to shut the AWD system off, other than maybe pulling a fuse, so I don't think "user error" is an issue other than the traction modes. The i-VTM4 AWD system is engaged at the rear differential by an electrical hydraulic pump [edit: one electric motor, two pumps], electrical proportional hydraulic valves, and hydraulically actuated clutches.
If you have a lot
of time on your hands, read this:
Acura SH-AWD: A Comprehensive Analysis (Updated Jan.8, 2016) - YouWheel.com - Car News and Review
and this: http://papers.sae.org/2015-01-1098/
( preview option on this page )
If your vehicle's belly is on top of packed snow and you have spun the tires so there is ice under them, you are pretty much stuck no matter what you're driving. You need a shovel to get the snow out from under the chassis and clear a path for the wheels to get moving. It doesn't hurt to have sand or kitty litter to throw down around the tires.
BTW, tires are everything!
Thanks for the question. I learned something from actually reading the manual!