Thank you! Very useful information.....Not much help. Just want to add the following info for information purpose.
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The i4wd (front diff system) will not come ON if the diff sensor does not recognize it being in 4x4.
Now. 4x4 on the Pioneer is fully manual. So it can be in 4x4 without the dash (computer) recognizing it. As you mentioned the wheel spinning during the 9pt u-turn.
If hill assist is working. Then so is the i4wd (system). It's just not working the i4wd for the front diff control because it thinks it's still in 2x4.
So with that limited info. I would look at the front diff sensors and or wires.
Good luck.
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