Mitsubishi 3000GT Service Manual page 248

INJECTORS <Non Turbo>
injection
OPERATION
The injector is an injection nozzle with a solenoid valve which injects fuel according to the injection
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signal coming from the engine control module.
The injector has a fixed nozzle opening area and the fuel pressure against manifold inside pressure
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is regulated to a fixed level. Therefore, the volume of fuel injected by the injector is determined
by the time during which the needle valve is open, namely, by the time during which the solenoid
coil is energized.
The battery voltage is applied through the MFI relay to this injector. When the engine control module
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turns on the power transistor in the module, the solenoid coil is energized to open the injector valve,
which then injects fuel.
MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION - Components
Engine control module
Filter
Engine control module connector
TSB Revision