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Acceleration skid control, or ASR, prevents the driven wheels from spinning or the car swerving due to excessive acceleration. Compared with ETS, ASR offers a broader scope of functions.
When either or both of the driven wheels threaten to lose grip, ASR controls the engine and brakes automatically by reducing engine power and braking the affected wheels. ASR is optionally available >>
This is the newer E system, but it explains the difference..
The basic plus of ASR is that it also controls throttle inputs.......not just wheel spin braking
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