2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 96Get this manual
3-48 FUEL SYSTEM (DFI) Fuel Injectors (Service CodeCharacter-41, 42, 43, 44InJ1, InJ2, InJ3, InJ4)
Injector Voltage Inspection
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Special ToolNeedle Adapter Set: 57001-1457 Injector Power Source Voltage to,te+ Meter () Battery () Terminal
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Wait 15 seconds before using the starter againPower Source Voltage at Injector Connector Standard: Battery Voltage