2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 90Get this manual
3-42 FUEL SYSTEM (DFI) Vehicle-down Sensor (Service CodeCharacter-31dOS)
This sensor has weight [A] with two magnets inside, and sends signal to the ECUBut when the watercraft banks 110 130 or more to either side (in fact falls down), the weight turns and shuts off the signalThe ECU senses this change, and stops the fuel pump, the fuel injectors, and the ignition systemHall IC [B]
Vehicle-down Sensor Connector [A] Ground Terminal BKW [B] Output Terminal BLW [C] Power Source Terminal RG [D]
Vehicle-down Sensor Removal CA UTION
Never drop the down-sensor, especially on hard surfaceSuch shock to the sensor can damage itemRSeaot v(eee HullEngine Hood chapter) Front Storage Pocket (see HullEngine Hood chapter) Bracket Bolts [A] and Washers em RVehocvle:-down Sensor Connector [A] ie Screws [B] Vehicle-down Sensor [C]