DIRECT INJECTION ELECTRICAL CIRCUITS
The outboard’s 55 V alternator circuit supplies the injectors and fuel circulation pump with the current required to activate the fuel injectors and pump. Unique circuits from the EMM distribute this current to the specific injector or pump.
The EMM controls injector and pump operation by rapidly connecting and disconnecting one side of each component’s internal coil to ground. Current must flow from the EMM to the injectors and pump, through the winding of the component, back to the EMM, and through the EMM to ground. The injector’s internal coil provides approximately 2 to 3 ohms of resistance in the injector circuit.
Requirements for injector or circulation pump activation:
• 55 V output from the alternator to the EMM and through the individual circuits; and
• Switched ground connection provided by the EMM.
IMPORTANT: The 55 V alternator output is produced by stator input to EMM and rectifier circuits of EMM.
Injector / Circulation Pump Circuits Diagram
- Stator
- EMM
- Fuel injector
- Fuel circulation pump
- Capacitor
- WHITE/RED (55 V)
- BLACK ground wires
- BLUE
- GREEN
- BROWN
