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Bad Alignment Will Dick Up Your VSC

Discussion in 'Technical Chat' started by jandrews, Apr 1, 2012.

  1. Apr 1, 2012 at 2:41 PM

    jandrews [OP] Carolina Alliance Southwest Region Ambassador

    Jun 7, 2009
    '09 FourDubDee TRD OR
    A-TRUCK, Fat Kid in the Bed, Custom Pinstriping, Ported and Polished Muffler Bearing, Hi-Performance Bed Mat
    This is for us newer model fuckers.

    Did you know if you throw your alignment out far enough, it will disable your VSC?

    I found this out over the past couple days. Yesterday while offroad in wet, muddy conditions I went after a ledge with a little more gas than I usually would. We were basically sledding uphill, so this was the only way things were gonna go.

    *Something* caught the driver front wheel hard enough to stop the truck and throw me into the steering wheel. Threw my alignment way out - had to drive home holding the wheel about 70 degrees left turn for straight tracking.

    Anyway, on that same trail, I was later making a difficult descent and trying not to roll the truck. In the midst of shifting myself and my passenger around the cab, I knocked the e-brake on. With a little gas there was a "plank* from the rear end and the truck started moving. That's when I noticed I'd bumped the e-brake on. At first I was worried I'd toasted another R+P (I was locked at the time). Later, I noticed the VSC warning light on, leading me to theorize I had instead toasted one of the rear drum brakes and the integral wheel sensor. There were no sounds/signs traction control was trying to act on any of the wheels.

    So, this afternoon, take the truck to have it aligned so I can kill one bird. Ended up getting two with one stone. After correcting my alignment, I no longer have a VSC warning.

    This leads me to theorize either:

    - The VSC system wheel sensors actually measure angular velocity relative to the truck and one another, not just rotational.


    - My toe was so far out it was actually causing a big enough rotational velocity difference for the computer to notice it and fire up the light.

    I didn't immediately think they were related, but apparently the VSC gets super unhappy if your alignment is too far out and shuts down. Good to know.

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