2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 97Get this manual
FUEL SYSTEM (DFI) 3-49 Fuel Injectors (Service CodeCharacter-41, 42, 43, 44InJ1, InJ2, InJ3, InJ4)
conn ct crRemnoevcet each eesorlisghot rsientjeB]too [tAeinjector harness conCon tt [th nector [C]gn Tuhrnlethcerainkiinignthse ietch iOe .with the starter motor, watch Wi ng the test lightsI the rethe circuit the ECU, and the iring re 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
Injector Resistance Inspection