Overactive VSC on 2005 Toyota Sequoia

[ryanschillinger]

2005 Sequoia 2wd. Taking corners at any decent rate of speed activates the stability control with the beeping and ABS actuation. I don’t recall this being an issue prior to changing the worn steering rack bushings…
I’ve tried doing the zero point calibration without any change. Live data seems to show proper wheel speed readings and steering angle sensor seems to smoothly track the turning of the wheel lock to lock. Yaw sensor maybe? I don’t know what values to look for.
Alignment is good, just had it checked yesterday.
Maybe something for the dealer to diagnose? We live in a small town with lots of windy roads, so this is really getting annoying. Any help is appreciated.

 

[Greasymechtech]

Thought it was normal for that model.

Verify with dealer if there are any software patches.

 

[LazyDog]

How about cleaning the ABS sensors!

 

[wpod]

Talk to some one that works on them regularly.

 

[ryanschillinger]

Thought it was normal for that model.

Verify with dealer if there are any software patches.

I can’t imagine this is normal. Driving at a pretty normal pace through corners it’s beeping and activating stability control. I don’t remember it happening before replacing the steering rack bushings though…

 

[ryanschillinger]

How about cleaning the ABS sensors!

The wheel speed sensors? They seemed to be all pretty much reading identical while driving. I’m still confused what’s tripping the stability control.

 

[ryanschillinger]

Talk to some one that works on them regularly.

This is a small town and we’re almost 2 hours from the dealer. I might bring it in though.

 

[meep]

It may have “learned” some amount of slop in the old system, and now it’s behaving differently. I wonder if there’s a way to do some sort of adaptives reset.

 

[ryanschillinger]

I’m wondering so myself. I did the zero point calibration which should’ve reset things but no change. Maybe the dealer has a way to do it better.

 

[Marcozi]

How's the wheel alignment?

 

[ryanschillinger]

How's the wheel alignment?

Alignment is good. I had it aligned about 5000 miles ago but have since replaced the rack bushings. Brought it back to get alignment and was still in spec.

 

[wpod]

How does the stability control work? Where does the information come from for the computer to know the stability?

 

[Jetronic]

looks at steering angle and yaw rate.

Do you have the same tyres front and back?

 

[ryanschillinger]

How does the stability control work? Where does the information come from for the computer to know the stability?

Not 100% sure but I think wheel speed sensors, steering angle sensor, and yaw rate sensor.

 

[ryanschillinger]

looks at steering angle and yaw rate.

Do you have the same tyres front and back?

Steering angle seems to read smoothly from lock to lock and back. I’m not sure what values yaw rate should be reading. Same Bridgestone tires all around in good condition.

 

[Jetronic]

I don't know either what yaw rates the ABS expects, but if this is happening at moderate speeds, add pressure to the front tyres. This should decrease the slip angles of the front tyres and reduce understeer (more yaw). If that makes matters worse, reduce the air pressure.

If you find something that improves things, you can probably do the opposite on the rear axle.

Key is to do 1 thing at a time.

 

[atikovi]

What codes are stored or pending?

 

[meep]

Same steering rack, right? You didn’t install a different rack with perchance a differing steering ratio?

 

[meep]

And is 0 degree steering angle true to a dead straight wheel?

 

[thescreensavers]

Factory tire size?