182
FUEL SYSTEM
DIRECT INJECTION ELECTRICAL CIRCUITS
DIRECT INJECTION
ELECTRICAL CIRCUITS
The outboard’s 55 V alternator circuit supplies the
injectors with the necessary current. Unique cir-
cuits from the EMM distribute this current to the
specific injector.
The EMM controls injector 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, through the
winding of the component, back to the EMM, and
through the EMM to ground. The injector’s internal
coil provides approximately 3 ohms of resistance
in the injector circuit.
Requirements for injector activation:
• 55 V system voltage from the EMM and through
the individual circuits; and
• Switched ground connection provided by the
EMM.
IMPORTANT: System voltage (55 V) output is
produced by stator input to EMM and rectifier cir-
cuits of EMM.
Refer to FUEL DELIVERY on p. 131 for additional
test procedures.
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