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Originally Posted by JenBug
So basically, if I want to stay on the road in icy/rainy/wet situations, I should not press that button...thanks everyone.
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ASR is part of the ABS brakes. The best example I can give of what it does is lets stay you are at a traffic light waiting for the green light during an snow storm. When the light turns green and you stomp on the throttle pedal the front tires are going to spin. ASR will apply the brakes and have the ECM reduce power output of the engine so that the front wheels can gain traction. Another function of this is "EDL" which is where if one wheel starts to spin, the brake for that wheel will be applied just for that wheel so it can gain traction again. ASR only watches and controls the front brakes.
If you see the light in the instrument cluster blink on a rainy day, that is the ASR kicking in.
When you depress the button on the dash and the light comes on, you have not turned it off. What you have done is raise the level of how much wheel spin is now going to be allowed. If you got stuck in a snow rut, ASR will keep killing the power to the wheels, you'll have to rock back and forth to get out, thus hit the button to raise the level of how much wheel spin is allowed so you can get going.
However, if your are driving down the road and a puppy dog jumps out in front of your car and you swerve, ASR won't help you at all... if you loose control, then you loose control.
There is another system called "ESP" which if the puppy dog jumped out in front of you and you swerve, then it will try to maintain control of the car.... ESP can control each wheel brake seperatly, it monitors how much steering wheel input you are giving, each wheel's speed, lateral force of a turn. Then based on that info, it will cut power output of the engine and apply seperate amounts of force for each wheel to try and keep the car on course that you are aiming for.
Later.