Check Advancetrak? Maybe just add Brake Fluid

[SoonerLS]

AdvanceTrac uses differential braking and modulation of engine power to control yaw (and traction), at least in the '03-'06 LSes. If it senses that the brakes are getting too hot, it will only use engine modulation.

The "Check AdvanceTrac" display on the Message Center indicates a system error, not a system activation. If it happens, then goes away after an engine restart, don't sweat it; if it happens again, you have a problem that needs to be diagnosed.

FWIW, when I had that error, it was caused by a faulty yaw sensor (fixed under warranty).

 

[mholhut]

Hmmmmmm.... yaw sensor, ay? Might be my deal, but probably costs a buttload of cash.

 

[mholhut]

Damn! $277 for a yaw sensor through FPN! I hope it's just an abs sensor.

 

[macboy]

Damn! $277 for a yaw sensor through FPN! I hope it's just an abs sensor

No this is used by the AdvanceTrac stability control.
However, your problem may be different. You said you could sense a front wheel locking up. If so you may have a bad wheel speed sensor. This will screw up both the stabitliy control and the ABS. Probably best to have it diagnosed and fixed, since these are important safety features.

 

[macboy]

the advance trak system on the ls. how does that work does it apply brake the brake to the inside wheel like some traction control systems? if not just key me in.

Traction control systems never do that; only stability control systems do it (despite what any car salesman has told you). Traction control systems will apply brakes to a slipping drive wheel, and/or reduce engine power, when it senses wheel spin. Traction control makes no attempt to correct for skidding. AdvanceTrac is a combination of traction control and a much more advanced system that implements stability control, or anti-skid. It senses when the car is not moving in the direction it should be. Examples are understeer, oversteer, and lateral skidding (like what might happen when you change lanes on a very snowy/slushy road). It will selectively apply braking to one or the other front wheel to create a rotational force which helps put the car back on the right track.

Senses slippage or uneven tire rotation and cuts engine timing to avoid wheelspin. Not sure how much the brakes come into play with it, if at all.

And that's why you generally don't try to answer when you aren't sure. You are way off. No offense, man. It has everything to do with brakes. And little to nothing to do with engine timing (though it can use "engine management").

If it senses that the brakes are getting too hot, it will only use engine modulation.

This is true only for the traction control half of the system. The stability control half of the system will always continue to use the brakes no matter how hot they become.

 

[SoonerLS]

No this is used by the AdvanceTrac stability control.

He's saying that he hopes it's an ABS sensor, not the yaw sensor, that's bad, because the ABS sensor is less expensive...

 

[SoonerLS]

And that's why you generally don't try to answer when you aren't sure.

This is true only for the traction control half of the system. The stability control half of the system will always continue to use the brakes no matter how hot they become.

You should take your own advice. From the Owner's Manual:

If the AdvanceTrac system is activated excessively in a short period of
time, the brake portion of the system will shut down to allow the brakes
to cool down. A limited AdvanceTrac function using only engine power
reduction will still help control the wheels from over-spinning. When the
brakes have cooled down, the system will again function normally.
Anti-lock braking is not affected by this condition and will function
normally during the cool-down period.
-- 2004 LS Owner's Guide, p. 203
-- 2006 LS Owner's Guide, P. 224