2003 Polaris MSX 140 Personal Watercraft Service Manual, Page 165Get this manual
Electrical Systems Enhanced Steering Performance (E.S.POwner's Manual Supplement
Engine thrust is required to steer and turn the vehicleThus, when you release the throttle, the watercraft's ability to turn is reducedThe Polaris MSX 140 watercraft is equipped with Polaris Enhanced Steering Performance (ESP) technology, system that provides enhanced maneuverability if the operator releases the throttle but still needs steering controlESP will provide thrust should the operator release the throttle and turn the handlebars completely to either the left or rightESP works when the speed of the watercraft is more than 15 miles per hour, but not at slower speeds or when the engine is offESP is not substitute for safe riding techniques, which should be followed and are described in the labels attached to the watercraft and in the Owner's Manual
Enhanced Steering Performance (E.S.PTechnical Overview
During normal operation, the TPS relays the position of the throttle plates and thus the throttle flipper to the EMM via what are called throttle countsLocated between the TPS and EMM is the E.S.PcontrollerThe E.S.Pcontroller will interrupt the throttle count signal from the TPS and provide different signal to the EMM when ALL of the following criteria are met: Boat speed is at or above 15 MPH (24 KmH)S Throttle flipper is completely released(Throttle plates closed Handlebar is turned to the full left or full right positionPrimary components in the system are: Component