Quote:
Originally Posted by midlifetruck
My only guess is that the mechanic did not engage the center differential. If the diff was not engaged and the VSC is active, could this cause this kind of misdiagnosis?
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Possible, if he saw that VSC was kicking in he might have assumed that meant that 4WD wasn't engaged. As far as I know if you get solid green lights on the dash indicator then the system is definitely engaged.
When you push the 4WD button you get what most people would call AWD. You have limited slip between all wheels and can drive on pavement safely. VSC is still active. This is true in either HI or LO.
When you push the button on the dash and lock the differential, in either HI or LO, VSC is turned off. You get a 50/50 split in power between the front and rear wheels, and can spin the wheels to power through mud, snow, etc...
However, even with the differential locked ATRAC is still active. Which is four wheel traction control. It prevents one wheel sitting on ice, for example, from robbing all the power as would happen with a standard limited slip differential. ATRAC is always active, and works on the both axles in 4WD, or just the rear in 2WD.
