It was from 2003 onwards on the 4200.
Pre MY03 was ASR only (traction control), then MSP followed for the MY03, copied from the handbook:
"The system is capable of detecting whether the driver is about to lose control of the vehicle. In this case, it can activate the brake calipers individually and engine control, in order to create a torque sufficient to resist the vehicle's yawing moment"
My thoughts are that if MSP comes into play you are not driving to the prevailing road conditions.