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Old 12-09-2014, 09:51 AM   #1
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Advancetrac malfunction?

Hey guys, this morning were having heavy heavy ice cold rain. If it were a degree colder it would be snow. I was driving on a back road with a ton of water running down it, and I could feel the car hydro planeing on top of the water. The traction control light was constantly flashing for more than a minute. I turned off the street on to one with a little less puddles and it was fine. Then all at once it started to feel like it was pulling the opposite way of the turn I was on, the car started to buck because of it cutting power, the traction control light was flashing and it said on the screen, advancetrac needs service. I pulled into a gas station, the tires look fine, the rear axle looks good. Started it back up and it was back to normal? What happened. Now I don't know if it's me but it Flet like it was pulling to the left after that, maybe road crown idk.
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Old 12-09-2014, 11:00 AM   #2
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A guy on the 3.7 section of this forum was having similar issues, so this is what i posted in his thread:


I'm shooting from the hip here, but heres what i'm thinking.

Part of the way the computer measures "traction" is by using a Hal Effect Sensor
( Hall effect sensor - Wikipedia, the free encyclopedia )
At the rear hubs to measure wheel speed. Basically, with it being cold, i can only guess that these sensors are becoming unhappy some how. Maybe if theres snow, salt, grime, crap, ice? Or just some other junk in there, its losing signal and becoming unhappy. We've seen this happen on cars before that remove the under tray and the Crankshaft Position Sensor (also a Hal Effect) will get dirty and the engine goes all sorts of haywire. Perhaps then, as you drive and warm the car up the sensor regains signal?

Total shot in the dark, but it wouldn't take but a couple of minutes to jack the rear of the car up and slide under there and take a peak. If i remember correctly they're located opposite the Caliper. For example, if the (rear) caliper were located at 3:00, the sensor should be around ... mmm 7:00 or 8:00, perpendicular to the hub. Cant miss it.


It doesnt seem people in the "warmer" states are having these issues, its the guys that get snow and / or more inclement weather.
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Old 12-09-2014, 11:30 AM   #3
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Live in Florida and have never heard of this so that would make sense ^


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Old 12-09-2014, 01:39 PM   #4
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Quote:
Originally Posted by Voltwings View Post
A guy on the 3.7 section of this forum was having similar issues, so this is what i posted in his thread:


I'm shooting from the hip here, but heres what i'm thinking.

Part of the way the computer measures "traction" is by using a Hal Effect Sensor
( Hall effect sensor - Wikipedia, the free encyclopedia )
At the rear hubs to measure wheel speed. Basically, with it being cold, i can only guess that these sensors are becoming unhappy some how. Maybe if theres snow, salt, grime, crap, ice? Or just some other junk in there, its losing signal and becoming unhappy. We've seen this happen on cars before that remove the under tray and the Crankshaft Position Sensor (also a Hal Effect) will get dirty and the engine goes all sorts of haywire. Perhaps then, as you drive and warm the car up the sensor regains signal?

Total shot in the dark, but it wouldn't take but a couple of minutes to jack the rear of the car up and slide under there and take a peak. If i remember correctly they're located opposite the Caliper. For example, if the (rear) caliper were located at 3:00, the sensor should be around ... mmm 7:00 or 8:00, perpendicular to the hub. Cant miss it.


It doesnt seem people in the "warmer" states are having these issues, its the guys that get snow and / or more inclement weather.
Thanks so much, I drove the car all day since (actually just got home) didn't have any issues after that one time. The car was a Boston car before I got it, but it is super super clean underneath so Idk. Maybe it was to deep of a puddle and splashed the sensors and the magnets read a false value because of the water. Idk, I'm going to let it ride and see if it happens again.
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Old 12-09-2014, 08:01 PM   #5
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Perhaps some unusual combination of wheel slip, temperatures, moisture and steering inputs on the tricky surface just got the software all tangled up. Turning off the car may have cleared and reset it like restarting a computer?
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Old 12-09-2014, 08:04 PM   #6
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Quote:
Originally Posted by WJBertrand View Post
Perhaps some unusual combination of wheel slip, temperatures, moisture and steering inputs on the tricky surface just got the software all tangled up. Turning off the car may have cleared and reset it like restarting a computer?
That's what I'm banking on!
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Old 12-09-2014, 08:55 PM   #7
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It's all good, mine did it for a while whenever I would wash my car. If the sensor gets wet it can go nuts sometimes .


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