2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 95Get this manual
FUEL SYSTEM (DFI) 3-47 Fuel Injectors (Service CodeCharacter-41, 42, 43, 44InJ1, InJ2, InJ3, InJ4)
conn ct crRemnoevcet each eesorlisghot rsientjeB]too [tAeinjector harness conCon tt [th nectorC]g to Tuhrnlethcerainniinignthse ietch iOeN.with the starter motor, watch Wi ng the test lightsIf the test lights flicker at regular intervals, the injector circuit in the ECU, and the wiring are goodPerform the "Injector Resistance Inspection"
Injector signals can be also confirmed by connecting the
hand tester10 AC) instead of the test light set to the injector harness (female) connectorCrank the engine with the starter motor, and check to see if the hand oscillates at regular intervalsSpecial ToolHand Tester: 57001-1394
If the test light doesn't flicker (or the test hand doesn't oscillates), check the wiring and connectors againIf the wiring is good, check the injector voltage