This is quite interesting. This plug (with 15 terminals in arranged in 2 rows) you've mentioned, is belongs
to the injection controller unit. The injection controller unit and the AFM below is connected internally.
When the plug is removed from the injection controller, all of the fuel injection related functions should stop.
(It is not recommended to remove this plug when the ignition is on or at running engine,
it could damage the unit)
At the disconnection, the fuel pump relay should disengage immediately, stopping the fuel supply.
The injector valves will not get control signals from the controller unit, so they should remain closed,
blocking the fuel supply towards the intake ports of the cylinder heads, and even the fuel rail is still
contains some fuel, it shouldn't reach the cylinders.
The fact that the engine is still running after disconnection of the injection controller points injector failure
(injector leak), or shortcircuit of the injector valve wiring towards the ground, bypassing the control unit
(the injector valves are open all the time, while the ignition is turned on).